v2 RC2 (#33)

* Add PostgreSQL back end (#30)
* Upgrade password storage (#32)
* Change podcast/episode storage for SQLite (#29)
* Move date/time handling to NodaTime (#31)

src/Directory.Build.props

@@ -5,6 +5,6 @@
     <AssemblyVersion>2.0.0.0</AssemblyVersion>
     <FileVersion>2.0.0.0</FileVersion>
     <Version>2.0.0</Version>
-    <VersionSuffix>rc1</VersionSuffix>
+    <VersionSuffix>rc2</VersionSuffix>
   </PropertyGroup>
 </Project>

src/MyWebLog.Data/Converters.fs

@@ -122,12 +122,13 @@ module Json =
             (string >> WebLogUserId) reader.Value
 
     open Microsoft.FSharpLu.Json
+    open NodaTime
+    open NodaTime.Serialization.JsonNet
     
-    /// All converters to use for data conversion
-    let all () : JsonConverter seq =
-        seq {
-            // Our converters
-            CategoryIdConverter       ()
+    /// Configure a serializer to use these converters
+    let configure (ser : JsonSerializer) =
+        // Our converters
+        [   CategoryIdConverter       () :> JsonConverter
             CommentIdConverter        ()
             CustomFeedIdConverter     ()
             CustomFeedSourceConverter ()
@@ -143,6 +144,35 @@ module Json =
             UploadIdConverter         ()
             WebLogIdConverter         ()
             WebLogUserIdConverter     ()
-            // Handles DUs with no associated data, as well as option fields
-            CompactUnionJsonConverter ()
-        }
+        ] |> List.iter ser.Converters.Add
+        // NodaTime
+        let _ = ser.ConfigureForNodaTime DateTimeZoneProviders.Tzdb
+        // Handles DUs with no associated data, as well as option fields
+        ser.Converters.Add (CompactUnionJsonConverter ())
+        ser.NullValueHandling     <- NullValueHandling.Ignore
+        ser.MissingMemberHandling <- MissingMemberHandling.Ignore
+        ser
+    
+    /// Serializer settings extracted from a JsonSerializer (a property sure would be nice...)
+    let mutable private serializerSettings : JsonSerializerSettings option = None
+    
+    /// Extract settings from the serializer to be used in JsonConvert calls
+    let settings (ser : JsonSerializer) =
+        if Option.isNone serializerSettings then
+            serializerSettings <- JsonSerializerSettings (
+                ConstructorHandling            = ser.ConstructorHandling,
+                ContractResolver               = ser.ContractResolver,
+                Converters                     = ser.Converters,
+                DefaultValueHandling           = ser.DefaultValueHandling,
+                DateFormatHandling             = ser.DateFormatHandling,
+                MetadataPropertyHandling       = ser.MetadataPropertyHandling,
+                MissingMemberHandling          = ser.MissingMemberHandling,
+                NullValueHandling              = ser.NullValueHandling,
+                ObjectCreationHandling         = ser.ObjectCreationHandling,
+                ReferenceLoopHandling          = ser.ReferenceLoopHandling,
+                SerializationBinder            = ser.SerializationBinder,
+                TraceWriter                    = ser.TraceWriter,
+                TypeNameAssemblyFormatHandling = ser.TypeNameAssemblyFormatHandling,
+                TypeNameHandling               = ser.TypeNameHandling)
+                |> Some
+        serializerSettings.Value

src/MyWebLog.Data/Interfaces.fs

@@ -1,9 +1,10 @@
 namespace MyWebLog.Data
 
-open System
 open System.Threading.Tasks
 open MyWebLog
 open MyWebLog.ViewModels
+open Newtonsoft.Json
+open NodaTime
 
 /// The result of a category deletion attempt
 type CategoryDeleteResult =
@@ -137,7 +138,7 @@ type IPostData =
         WebLogId -> tag : string -> pageNbr : int -> postsPerPage : int -> Task<Post list>
     
     /// Find the next older and newer post for the given published date/time (excluding revisions and prior permalinks)
-    abstract member FindSurroundingPosts : WebLogId -> publishedOn : DateTime -> Task<Post option * Post option>
+    abstract member FindSurroundingPosts : WebLogId -> publishedOn : Instant -> Task<Post option * Post option>
     
     /// Restore posts from a backup
     abstract member Restore : Post list -> Task<unit>
@@ -326,6 +327,9 @@ type IData =
     /// Web log user data functions
     abstract member WebLogUser : IWebLogUserData
     
+    /// A JSON serializer for use in persistence
+    abstract member Serializer : JsonSerializer
+    
     /// Do any required start up data checks
     abstract member StartUp : unit -> Task<unit>
     

src/MyWebLog.Data/MyWebLog.Data.fsproj

@@ -5,10 +5,16 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Data.Sqlite" Version="6.0.7" />
+		<PackageReference Include="Microsoft.Data.Sqlite" Version="6.0.8" />
+		<PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="6.0.0" />
 		<PackageReference Include="Microsoft.FSharpLu.Json" Version="0.11.7" />
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+		<PackageReference Include="NodaTime" Version="3.1.2" />
+		<PackageReference Include="NodaTime.Serialization.JsonNet" Version="3.0.0" />
+		<PackageReference Include="Npgsql" Version="6.0.6" />
+		<PackageReference Include="Npgsql.FSharp" Version="5.3.0" />
+		<PackageReference Include="Npgsql.NodaTime" Version="6.0.6" />
 		<PackageReference Include="RethinkDb.Driver" Version="2.3.150" />
 		<PackageReference Include="RethinkDb.Driver.FSharp" Version="0.9.0-beta-07" />
 		<PackageReference Update="FSharp.Core" Version="6.0.5" />
@@ -29,6 +35,17 @@
 		<Compile Include="SQLite\SQLiteWebLogData.fs" />
 		<Compile Include="SQLite\SQLiteWebLogUserData.fs" />
 		<Compile Include="SQLiteData.fs" />
+		<Compile Include="Postgres\PostgresHelpers.fs" />
+		<Compile Include="Postgres\PostgresCache.fs" />
+		<Compile Include="Postgres\PostgresCategoryData.fs" />
+		<Compile Include="Postgres\PostgresPageData.fs" />
+		<Compile Include="Postgres\PostgresPostData.fs" />
+		<Compile Include="Postgres\PostgresTagMapData.fs" />
+		<Compile Include="Postgres\PostgresThemeData.fs" />
+		<Compile Include="Postgres\PostgresUploadData.fs" />
+		<Compile Include="Postgres\PostgresWebLogData.fs" />
+		<Compile Include="Postgres\PostgresWebLogUserData.fs" />
+        <Compile Include="PostgresData.fs" />
 	</ItemGroup>
 
 </Project>

src/MyWebLog.Data/Postgres/PostgresCache.fs

@@ -0,0 +1,210 @@
+namespace MyWebLog.Data.Postgres
+
+open System.Threading
+open System.Threading.Tasks
+open Microsoft.Extensions.Caching.Distributed
+open NodaTime
+open Npgsql.FSharp
+
+/// Helper types and functions for the cache
+[<AutoOpen>]
+module private Helpers =
+    
+    /// The cache entry
+    type Entry =
+        {   /// The ID of the cache entry
+            Id : string
+            
+            /// The value to be cached
+            Payload : byte[]
+            
+            /// When this entry will expire
+            ExpireAt : Instant
+            
+            /// The duration by which the expiration should be pushed out when being refreshed
+            SlidingExpiration : Duration option
+            
+            /// The must-expire-by date/time for the cache entry
+            AbsoluteExpiration : Instant option
+        }
+    
+    /// Run a task synchronously
+    let sync<'T> (it : Task<'T>) = it |> (Async.AwaitTask >> Async.RunSynchronously)
+    
+    /// Get the current instant
+    let getNow () = SystemClock.Instance.GetCurrentInstant ()
+    
+    /// Create a parameter for the expire-at time
+    let expireParam =
+        typedParam "expireAt"
+
+
+/// A distributed cache implementation in PostgreSQL used to handle sessions for myWebLog
+type DistributedCache (connStr : string) =
+    
+    // ~~~ INITIALIZATION ~~~
+    
+    do
+        task {
+            let! exists =
+                Sql.connect connStr
+                |> Sql.query $"
+                    SELECT EXISTS
+                        (SELECT 1 FROM pg_tables WHERE schemaname = 'public' AND tablename = 'session')
+                      AS {existsName}"
+                |> Sql.executeRowAsync Map.toExists
+            if not exists then
+                let! _ =
+                    Sql.connect connStr
+                    |> Sql.query
+                        "CREATE TABLE session (
+                            id                  TEXT        NOT NULL PRIMARY KEY,
+                            payload             BYTEA       NOT NULL,
+                            expire_at           TIMESTAMPTZ NOT NULL,
+                            sliding_expiration  INTERVAL,
+                            absolute_expiration TIMESTAMPTZ);
+                        CREATE INDEX idx_session_expiration ON session (expire_at)"
+                    |> Sql.executeNonQueryAsync
+                ()
+        } |> sync
+    
+    // ~~~ SUPPORT FUNCTIONS ~~~
+    
+    /// Get an entry, updating it for sliding expiration
+    let getEntry key = backgroundTask {
+        let idParam = "@id", Sql.string key
+        let! tryEntry =
+            Sql.connect connStr
+            |> Sql.query "SELECT * FROM session WHERE id = @id"
+            |> Sql.parameters [ idParam ]
+            |> Sql.executeAsync (fun row ->
+                {   Id                 = row.string                     "id"
+                    Payload            = row.bytea                      "payload"
+                    ExpireAt           = row.fieldValue<Instant>        "expire_at"
+                    SlidingExpiration  = row.fieldValueOrNone<Duration> "sliding_expiration"
+                    AbsoluteExpiration = row.fieldValueOrNone<Instant>  "absolute_expiration"   })
+            |> tryHead
+        match tryEntry with
+        | Some entry ->
+            let now      = getNow ()
+            let slideExp = defaultArg entry.SlidingExpiration  Duration.MinValue
+            let absExp   = defaultArg entry.AbsoluteExpiration Instant.MinValue
+            let needsRefresh, item =
+                if entry.ExpireAt = absExp then false, entry
+                elif slideExp = Duration.MinValue && absExp = Instant.MinValue then false, entry
+                elif absExp > Instant.MinValue && entry.ExpireAt.Plus slideExp > absExp then
+                    true, { entry with ExpireAt = absExp }
+                else true, { entry with ExpireAt = now.Plus slideExp }
+            if needsRefresh then
+                let! _ =
+                    Sql.connect connStr
+                    |> Sql.query "UPDATE session SET expire_at = @expireAt WHERE id = @id"
+                    |> Sql.parameters [ expireParam item.ExpireAt; idParam ]
+                    |> Sql.executeNonQueryAsync
+                ()
+            return if item.ExpireAt > now then Some entry else None
+        | None -> return None
+    }
+    
+    /// The last time expired entries were purged (runs every 30 minutes)
+    let mutable lastPurge = Instant.MinValue
+    
+    /// Purge expired entries every 30 minutes
+    let purge () = backgroundTask {
+        let now = getNow ()
+        if lastPurge.Plus (Duration.FromMinutes 30L) < now then
+            let! _ =
+                Sql.connect connStr
+                |> Sql.query "DELETE FROM session WHERE expire_at < @expireAt"
+                |> Sql.parameters [ expireParam now ]
+                |> Sql.executeNonQueryAsync
+            lastPurge <- now
+    }
+    
+    /// Remove a cache entry
+    let removeEntry key = backgroundTask {
+        let! _ =
+            Sql.connect connStr
+            |> Sql.query "DELETE FROM session WHERE id = @id"
+            |> Sql.parameters [ "@id", Sql.string key ]
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Save an entry
+    let saveEntry (opts : DistributedCacheEntryOptions) key payload = backgroundTask {
+        let now = getNow ()
+        let expireAt, slideExp, absExp =
+            if opts.SlidingExpiration.HasValue then
+                let slide = Duration.FromTimeSpan opts.SlidingExpiration.Value
+                now.Plus slide, Some slide, None
+            elif opts.AbsoluteExpiration.HasValue then
+                let exp = Instant.FromDateTimeOffset opts.AbsoluteExpiration.Value
+                exp, None, Some exp
+            elif opts.AbsoluteExpirationRelativeToNow.HasValue then
+                let exp = now.Plus (Duration.FromTimeSpan opts.AbsoluteExpirationRelativeToNow.Value)
+                exp, None, Some exp
+            else
+                // Default to 1 hour sliding expiration
+                let slide = Duration.FromHours 1
+                now.Plus slide, Some slide, None
+        let! _ =
+            Sql.connect connStr
+            |> Sql.query
+                "INSERT INTO session (
+                    id, payload, expire_at, sliding_expiration, absolute_expiration
+                ) VALUES (
+                    @id, @payload, @expireAt, @slideExp, @absExp
+                ) ON CONFLICT (id) DO UPDATE
+                SET payload             = EXCLUDED.payload,
+                    expire_at           = EXCLUDED.expire_at,
+                    sliding_expiration  = EXCLUDED.sliding_expiration,
+                    absolute_expiration = EXCLUDED.absolute_expiration"
+            |> Sql.parameters
+                [   "@id",      Sql.string key
+                    "@payload", Sql.bytea payload
+                    expireParam expireAt
+                    optParam "slideExp" slideExp
+                    optParam "absExp"   absExp ]
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+        
+    // ~~~ IMPLEMENTATION FUNCTIONS ~~~
+    
+    /// Retrieve the data for a cache entry
+    let get key (_ : CancellationToken) = backgroundTask {
+        match! getEntry key with
+        | Some entry ->
+            do! purge ()
+            return entry.Payload
+        | None -> return null
+    }
+    
+    /// Refresh an entry
+    let refresh key (cancelToken : CancellationToken) = backgroundTask {
+        let! _ = get key cancelToken
+        ()
+    }
+    
+    /// Remove an entry
+    let remove key (_ : CancellationToken) = backgroundTask {
+        do! removeEntry key
+        do! purge ()
+    }
+    
+    /// Set an entry
+    let set key value options (_ : CancellationToken) = backgroundTask {
+        do! saveEntry options key value
+        do! purge ()
+    }
+    
+    interface IDistributedCache with
+        member this.Get key = get key CancellationToken.None |> sync
+        member this.GetAsync (key, token) = get key token
+        member this.Refresh key = refresh key CancellationToken.None |> sync
+        member this.RefreshAsync (key, token) = refresh key token
+        member this.Remove key = remove key CancellationToken.None |> sync
+        member this.RemoveAsync (key, token) = remove key token
+        member this.Set (key, value, options) = set key value options CancellationToken.None |> sync
+        member this.SetAsync (key, value, options, token) = set key value options token

src/MyWebLog.Data/Postgres/PostgresCategoryData.fs

@@ -0,0 +1,172 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog category data implementation
+type PostgresCategoryData (conn : NpgsqlConnection) =
+    
+    /// Count all categories for the given web log
+    let countAll webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT COUNT(id) AS {countName} FROM category WHERE web_log_id = @webLogId"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeRowAsync Map.toCount
+    
+    /// Count all top-level categories for the given web log
+    let countTopLevel webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT COUNT(id) AS {countName} FROM category WHERE web_log_id = @webLogId AND parent_id IS NULL"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeRowAsync Map.toCount
+    
+    /// Retrieve all categories for the given web log in a DotLiquid-friendly format
+    let findAllForView webLogId = backgroundTask {
+        let! cats =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM category WHERE web_log_id = @webLogId ORDER BY LOWER(name)"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeAsync Map.toCategory
+        let ordered = Utils.orderByHierarchy cats None None []
+        let counts  =
+            ordered
+            |> Seq.map (fun it ->
+                // Parent category post counts include posts in subcategories
+                let catIdSql, catIdParams =
+                    ordered
+                    |> Seq.filter (fun cat -> cat.ParentNames |> Array.contains it.Name)
+                    |> Seq.map (fun cat -> cat.Id)
+                    |> Seq.append (Seq.singleton it.Id)
+                    |> List.ofSeq
+                    |> inClause "AND pc.category_id" "id" id
+                let postCount =
+                    Sql.existingConnection conn
+                    |> Sql.query $"
+                        SELECT COUNT(DISTINCT p.id) AS {countName}
+                          FROM post p
+                               INNER JOIN post_category pc ON pc.post_id = p.id
+                         WHERE p.web_log_id = @webLogId
+                           AND p.status     = 'Published'
+                           {catIdSql}"
+                    |> Sql.parameters (webLogIdParam webLogId :: catIdParams)
+                    |> Sql.executeRowAsync Map.toCount
+                    |> Async.AwaitTask
+                    |> Async.RunSynchronously
+                it.Id, postCount)
+            |> List.ofSeq
+        return
+            ordered
+            |> Seq.map (fun cat ->
+                { cat with
+                    PostCount = counts
+                                |> List.tryFind (fun c -> fst c = cat.Id)
+                                |> Option.map snd
+                                |> Option.defaultValue 0
+                })
+            |> Array.ofSeq
+    }
+    /// Find a category by its ID for the given web log
+    let findById catId webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM category WHERE id = @id AND web_log_id = @webLogId"
+        |> Sql.parameters [ "@id", Sql.string (CategoryId.toString catId); webLogIdParam webLogId ]
+        |> Sql.executeAsync Map.toCategory
+        |> tryHead
+    
+    /// Find all categories for the given web log
+    let findByWebLog webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM category WHERE web_log_id = @webLogId"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync Map.toCategory
+    
+    
+    /// Delete a category
+    let delete catId webLogId = backgroundTask {
+        match! findById catId webLogId with
+        | Some cat ->
+            // Reassign any children to the category's parent category
+            let  parentParam = "@parentId", Sql.string (CategoryId.toString catId)
+            let! hasChildren =
+                Sql.existingConnection conn
+                |> Sql.query $"SELECT EXISTS (SELECT 1 FROM category WHERE parent_id = @parentId) AS {existsName}"
+                |> Sql.parameters [ parentParam ]
+                |> Sql.executeRowAsync Map.toExists
+            if hasChildren then
+                let! _ =
+                    Sql.existingConnection conn
+                    |> Sql.query "UPDATE category SET parent_id = @newParentId WHERE parent_id = @parentId"
+                    |> Sql.parameters
+                        [   parentParam
+                            "@newParentId", Sql.stringOrNone (cat.ParentId |> Option.map CategoryId.toString) ]
+                    |> Sql.executeNonQueryAsync
+                ()
+            // Delete the category off all posts where it is assigned, and the category itself
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query
+                    "DELETE FROM post_category
+                      WHERE category_id = @id
+                        AND post_id IN (SELECT id FROM post WHERE web_log_id = @webLogId);
+                     DELETE FROM category WHERE id = @id"
+                |> Sql.parameters [ "@id", Sql.string (CategoryId.toString catId); webLogIdParam webLogId ]
+                |> Sql.executeNonQueryAsync
+            return if hasChildren then ReassignedChildCategories else CategoryDeleted
+        | None -> return CategoryNotFound
+    }
+    
+    /// The INSERT statement for a category
+    let catInsert =
+        "INSERT INTO category (
+            id, web_log_id, name, slug, description, parent_id
+        ) VALUES (
+            @id, @webLogId, @name, @slug, @description, @parentId
+        )"
+    
+    /// Create parameters for a category insert / update
+    let catParameters (cat : Category) = [
+        webLogIdParam cat.WebLogId
+        "@id",          Sql.string       (CategoryId.toString cat.Id)
+        "@name",        Sql.string       cat.Name
+        "@slug",        Sql.string       cat.Slug
+        "@description", Sql.stringOrNone cat.Description
+        "@parentId",    Sql.stringOrNone (cat.ParentId |> Option.map CategoryId.toString)
+    ]
+
+    /// Save a category
+    let save cat = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {catInsert} ON CONFLICT (id) DO UPDATE
+                SET name        = EXCLUDED.name,
+                    slug        = EXCLUDED.slug,
+                    description = EXCLUDED.description,
+                    parent_id   = EXCLUDED.parent_id"
+            |> Sql.parameters (catParameters cat)
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Restore categories from a backup
+    let restore cats = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.executeTransactionAsync [
+                catInsert, cats |> List.map catParameters
+            ]
+        ()
+    }
+    
+    interface ICategoryData with
+        member _.Add cat = save cat
+        member _.CountAll webLogId = countAll webLogId
+        member _.CountTopLevel webLogId = countTopLevel webLogId
+        member _.FindAllForView webLogId = findAllForView webLogId
+        member _.FindById catId webLogId = findById catId webLogId
+        member _.FindByWebLog webLogId = findByWebLog webLogId
+        member _.Delete catId webLogId = delete catId webLogId
+        member _.Restore cats = restore cats
+        member _.Update cat = save cat

src/MyWebLog.Data/Postgres/PostgresHelpers.fs

@@ -0,0 +1,240 @@
+/// Helper functions for the PostgreSQL data implementation
+[<AutoOpen>]
+module MyWebLog.Data.Postgres.PostgresHelpers
+
+open System
+open System.Threading.Tasks
+open MyWebLog
+open MyWebLog.Data
+open Newtonsoft.Json
+open NodaTime
+open Npgsql
+open Npgsql.FSharp
+
+/// Create a SQL parameter for the web log ID
+let webLogIdParam webLogId =
+    "@webLogId", Sql.string (WebLogId.toString webLogId)
+
+/// The name of the field to select to be able to use Map.toCount
+let countName = "the_count"
+
+/// The name of the field to select to be able to use Map.toExists
+let existsName = "does_exist"
+
+/// Create the SQL and parameters for an IN clause
+let inClause<'T> colNameAndPrefix paramName (valueFunc: 'T -> string) (items : 'T list) =
+    if List.isEmpty items then "", []
+    else
+        let mutable idx = 0
+        items
+        |> List.skip 1
+        |> List.fold (fun (itemS, itemP) it ->
+            idx <- idx + 1
+            $"{itemS}, @%s{paramName}{idx}", ($"@%s{paramName}{idx}", Sql.string (valueFunc it)) :: itemP)
+            (Seq.ofList items
+             |> Seq.map (fun it ->
+                 $"%s{colNameAndPrefix} IN (@%s{paramName}0", [ $"@%s{paramName}0", Sql.string (valueFunc it) ])
+             |> Seq.head)
+        |> function sql, ps -> $"{sql})", ps
+
+/// Create the SQL and parameters for the array equivalent of an IN clause
+let arrayInClause<'T> name (valueFunc : 'T -> string) (items : 'T list) =
+    if List.isEmpty items then "TRUE = FALSE", []
+    else
+        let mutable idx = 0
+        items
+        |> List.skip 1
+        |> List.fold (fun (itemS, itemP) it ->
+            idx <- idx + 1
+            $"{itemS} OR %s{name} && ARRAY[@{name}{idx}]",
+            ($"@{name}{idx}", Sql.string (valueFunc it)) :: itemP)
+            (Seq.ofList items
+             |> Seq.map (fun it ->
+                 $"{name} && ARRAY[@{name}0]", [ $"@{name}0", Sql.string (valueFunc it) ])
+             |> Seq.head)
+    
+/// Get the first result of the given query
+let tryHead<'T> (query : Task<'T list>) = backgroundTask {
+    let! results = query
+    return List.tryHead results
+}
+
+/// Create a parameter for a non-standard type
+let typedParam<'T> name (it : 'T) =
+    $"@%s{name}", Sql.parameter (NpgsqlParameter ($"@{name}", it))
+
+/// Create a parameter for a possibly-missing non-standard type
+let optParam<'T> name (it : 'T option) =
+    let p = NpgsqlParameter ($"@%s{name}", if Option.isSome it then box it.Value else DBNull.Value)
+    p.ParameterName, Sql.parameter p
+
+/// Mapping functions for SQL queries
+module Map =
+    
+    /// Map an id field to a category ID
+    let toCategoryId (row : RowReader) =
+        CategoryId (row.string "id")
+    
+    /// Create a category from the current row
+    let toCategory (row : RowReader) : Category =
+        {   Id          = toCategoryId row
+            WebLogId    = row.string       "web_log_id" |> WebLogId
+            Name        = row.string       "name"
+            Slug        = row.string       "slug"
+            Description = row.stringOrNone "description"
+            ParentId    = row.stringOrNone "parent_id"  |> Option.map CategoryId
+        }
+
+    /// Get a count from a row
+    let toCount (row : RowReader) =
+        row.int countName
+    
+    /// Create a custom feed from the current row
+    let toCustomFeed (ser : JsonSerializer) (row : RowReader) : CustomFeed =
+        {   Id      = row.string       "id"      |> CustomFeedId
+            Source  = row.string       "source"  |> CustomFeedSource.parse
+            Path    = row.string       "path"    |> Permalink
+            Podcast = row.stringOrNone "podcast" |> Option.map (Utils.deserialize ser)
+        }
+    
+    /// Get a true/false value as to whether an item exists
+    let toExists (row : RowReader) =
+        row.bool existsName
+    
+    /// Create a meta item from the current row
+    let toMetaItem (row : RowReader) : MetaItem =
+        {   Name  = row.string "name"
+            Value = row.string "value"
+        }
+    
+    /// Create a permalink from the current row
+    let toPermalink (row : RowReader) =
+        Permalink (row.string "permalink")
+    
+    /// Create a page from the current row
+    let toPage (ser : JsonSerializer) (row : RowReader) : Page =
+        { Page.empty with
+            Id              = row.string              "id"         |> PageId
+            WebLogId        = row.string              "web_log_id" |> WebLogId
+            AuthorId        = row.string              "author_id"  |> WebLogUserId
+            Title           = row.string              "title"
+            Permalink       = toPermalink row
+            PriorPermalinks = row.stringArray         "prior_permalinks" |> Array.map Permalink |> List.ofArray
+            PublishedOn     = row.fieldValue<Instant> "published_on"
+            UpdatedOn       = row.fieldValue<Instant> "updated_on"
+            IsInPageList    = row.bool                "is_in_page_list"
+            Template        = row.stringOrNone        "template"
+            Text            = row.string              "page_text"
+            Metadata        = row.stringOrNone        "meta_items"
+                              |> Option.map (Utils.deserialize ser)
+                              |> Option.defaultValue []
+        }
+    
+    /// Create a post from the current row
+    let toPost (ser : JsonSerializer) (row : RowReader) : Post =
+        { Post.empty with
+            Id              = row.string                    "id"         |> PostId
+            WebLogId        = row.string                    "web_log_id" |> WebLogId
+            AuthorId        = row.string                    "author_id"  |> WebLogUserId
+            Status          = row.string                    "status"     |> PostStatus.parse
+            Title           = row.string                    "title"
+            Permalink       = toPermalink row
+            PriorPermalinks = row.stringArray               "prior_permalinks" |> Array.map Permalink |> List.ofArray
+            PublishedOn     = row.fieldValueOrNone<Instant> "published_on"
+            UpdatedOn       = row.fieldValue<Instant>       "updated_on"
+            Template        = row.stringOrNone              "template"
+            Text            = row.string                    "post_text"
+            Episode         = row.stringOrNone              "episode"          |> Option.map (Utils.deserialize ser)
+            CategoryIds     = row.stringArrayOrNone         "category_ids"
+                              |> Option.map (Array.map CategoryId >> List.ofArray)
+                              |> Option.defaultValue []
+            Tags            = row.stringArrayOrNone         "tags"
+                              |> Option.map List.ofArray
+                              |> Option.defaultValue []
+            Metadata        = row.stringOrNone              "meta_items"
+                              |> Option.map (Utils.deserialize ser)
+                              |> Option.defaultValue []
+        }
+    
+    /// Create a revision from the current row
+    let toRevision (row : RowReader) : Revision =
+        {   AsOf = row.fieldValue<Instant> "as_of"
+            Text = row.string              "revision_text" |> MarkupText.parse
+        }
+    
+    /// Create a tag mapping from the current row
+    let toTagMap (row : RowReader) : TagMap =
+        {   Id       = row.string "id"         |> TagMapId
+            WebLogId = row.string "web_log_id" |> WebLogId
+            Tag      = row.string "tag"
+            UrlValue = row.string "url_value"
+        }
+    
+    /// Create a theme from the current row (excludes templates)
+    let toTheme (row : RowReader) : Theme =
+        { Theme.empty with
+            Id      = row.string "id" |> ThemeId
+            Name    = row.string "name"
+            Version = row.string "version"
+        }
+    
+    /// Create a theme asset from the current row
+    let toThemeAsset includeData (row : RowReader) : ThemeAsset =
+        {   Id        = ThemeAssetId (ThemeId (row.string "theme_id"), row.string "path")
+            UpdatedOn = row.fieldValue<Instant> "updated_on"
+            Data      = if includeData then row.bytea "data" else [||]
+        }
+    
+    /// Create a theme template from the current row
+    let toThemeTemplate includeText (row : RowReader) : ThemeTemplate =
+        {   Name = row.string "name"
+            Text = if includeText then row.string "template" else ""
+        }
+
+    /// Create an uploaded file from the current row
+    let toUpload includeData (row : RowReader) : Upload =
+        {   Id        = row.string              "id"         |> UploadId
+            WebLogId  = row.string              "web_log_id" |> WebLogId
+            Path      = row.string              "path"       |> Permalink
+            UpdatedOn = row.fieldValue<Instant> "updated_on"
+            Data      = if includeData then row.bytea "data" else [||]
+        }
+    
+    /// Create a web log from the current row
+    let toWebLog (row : RowReader) : WebLog =
+        {   Id           = row.string       "id"             |> WebLogId
+            Name         = row.string       "name"
+            Slug         = row.string       "slug"
+            Subtitle     = row.stringOrNone "subtitle"
+            DefaultPage  = row.string       "default_page"
+            PostsPerPage = row.int          "posts_per_page"
+            ThemeId      = row.string       "theme_id"       |> ThemeId
+            UrlBase      = row.string       "url_base"
+            TimeZone     = row.string       "time_zone"
+            AutoHtmx     = row.bool         "auto_htmx"
+            Uploads      = row.string       "uploads"        |> UploadDestination.parse
+            Rss          = {
+                IsFeedEnabled     = row.bool         "is_feed_enabled"
+                FeedName          = row.string       "feed_name"
+                ItemsInFeed       = row.intOrNone    "items_in_feed"
+                IsCategoryEnabled = row.bool         "is_category_enabled"
+                IsTagEnabled      = row.bool         "is_tag_enabled"
+                Copyright         = row.stringOrNone "copyright"
+                CustomFeeds       = []
+            }
+        }
+    
+    /// Create a web log user from the current row
+    let toWebLogUser (row : RowReader) : WebLogUser =
+        {   Id            = row.string                    "id"             |> WebLogUserId
+            WebLogId      = row.string                    "web_log_id"     |> WebLogId
+            Email         = row.string                    "email"
+            FirstName     = row.string                    "first_name"
+            LastName      = row.string                    "last_name"
+            PreferredName = row.string                    "preferred_name"
+            PasswordHash  = row.string                    "password_hash"
+            Url           = row.stringOrNone              "url"
+            AccessLevel   = row.string                    "access_level"   |> AccessLevel.parse
+            CreatedOn     = row.fieldValue<Instant>       "created_on"
+            LastSeenOn    = row.fieldValueOrNone<Instant> "last_seen_on"
+        }

src/MyWebLog.Data/Postgres/PostgresPageData.fs

@@ -0,0 +1,281 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Newtonsoft.Json
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog page data implementation        
+type PostgresPageData (conn : NpgsqlConnection, ser : JsonSerializer) =
+    
+    // SUPPORT FUNCTIONS
+    
+    /// Append revisions and permalinks to a page
+    let appendPageRevisions (page : Page) = backgroundTask {
+        let! revisions =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT as_of, revision_text FROM page_revision WHERE page_id = @pageId ORDER BY as_of DESC"
+            |> Sql.parameters [ "@pageId", Sql.string (PageId.toString page.Id) ]
+            |> Sql.executeAsync Map.toRevision
+        return { page with Revisions = revisions }
+    }
+    
+    /// Shorthand to map to a page
+    let toPage = Map.toPage ser
+    
+    /// Return a page with no text or revisions
+    let pageWithoutText row =
+        { toPage row with Text = "" }
+    
+    /// The INSERT statement for a page revision
+    let revInsert = "INSERT INTO page_revision VALUES (@pageId, @asOf, @text)"
+    
+    /// Parameters for a revision INSERT statement
+    let revParams pageId rev = [
+        typedParam "asOf" rev.AsOf
+        "@pageId", Sql.string (PageId.toString pageId)
+        "@text",   Sql.string (MarkupText.toString rev.Text)
+    ]
+    
+    /// Update a page's revisions
+    let updatePageRevisions pageId oldRevs newRevs = backgroundTask {
+        let toDelete, toAdd = Utils.diffRevisions oldRevs newRevs
+        if not (List.isEmpty toDelete) || not (List.isEmpty toAdd) then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.executeTransactionAsync [
+                    if not (List.isEmpty toDelete) then
+                        "DELETE FROM page_revision WHERE page_id = @pageId AND as_of = @asOf",
+                        toDelete
+                        |> List.map (fun it -> [
+                            "@pageId", Sql.string (PageId.toString pageId)
+                            typedParam "asOf" it.AsOf
+                        ])
+                    if not (List.isEmpty toAdd) then
+                        revInsert, toAdd |> List.map (revParams pageId)
+                ]
+            ()
+    }
+    
+    /// Does the given page exist?
+    let pageExists pageId webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT EXISTS (SELECT 1 FROM page WHERE id = @id AND web_log_id = @webLogId) AS {existsName}"
+        |> Sql.parameters [ "@id", Sql.string (PageId.toString pageId); webLogIdParam webLogId ]
+        |> Sql.executeRowAsync Map.toExists
+    
+    // IMPLEMENTATION FUNCTIONS
+    
+    /// Get all pages for a web log (without text, revisions, prior permalinks, or metadata)
+    let all webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM page WHERE web_log_id = @webLogId ORDER BY LOWER(title)"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync pageWithoutText
+    
+    /// Count all pages for the given web log
+    let countAll webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT COUNT(id) AS {countName} FROM page WHERE web_log_id = @webLogId"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeRowAsync Map.toCount
+    
+    /// Count all pages shown in the page list for the given web log
+    let countListed webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"
+            SELECT COUNT(id) AS {countName}
+              FROM page
+             WHERE web_log_id      = @webLogId
+               AND is_in_page_list = TRUE"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeRowAsync Map.toCount
+    
+    /// Find a page by its ID (without revisions)
+    let findById pageId webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM page WHERE id = @id AND web_log_id = @webLogId"
+        |> Sql.parameters [ "@id", Sql.string (PageId.toString pageId); webLogIdParam webLogId ]
+        |> Sql.executeAsync toPage
+        |> tryHead
+    
+    /// Find a complete page by its ID
+    let findFullById pageId webLogId = backgroundTask {
+        match! findById pageId webLogId with
+        | Some page ->
+            let! withMore = appendPageRevisions page
+            return Some withMore
+        | None -> return None
+    }
+    
+    /// Delete a page by its ID
+    let delete pageId webLogId = backgroundTask {
+        match! pageExists pageId webLogId with
+        | true ->
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query
+                    "DELETE FROM page_revision WHERE page_id = @id;
+                     DELETE FROM page          WHERE id      = @id"
+                |> Sql.parameters [ "@id", Sql.string (PageId.toString pageId) ]
+                |> Sql.executeNonQueryAsync
+            return true
+        | false -> return false
+    }
+    
+    /// Find a page by its permalink for the given web log
+    let findByPermalink permalink webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM page WHERE web_log_id = @webLogId AND permalink = @link"
+        |> Sql.parameters [ webLogIdParam webLogId; "@link", Sql.string (Permalink.toString permalink) ]
+        |> Sql.executeAsync toPage
+        |> tryHead
+    
+    /// Find the current permalink within a set of potential prior permalinks for the given web log
+    let findCurrentPermalink permalinks webLogId = backgroundTask {
+        if List.isEmpty permalinks then return None
+        else
+            let linkSql, linkParams = arrayInClause "prior_permalinks" Permalink.toString permalinks
+            return!
+                Sql.existingConnection conn
+                |> Sql.query $"SELECT permalink FROM page WHERE web_log_id = @webLogId AND ({linkSql})"
+                |> Sql.parameters (webLogIdParam webLogId :: linkParams)
+                |> Sql.executeAsync Map.toPermalink
+                |> tryHead
+    }
+    
+    /// Get all complete pages for the given web log
+    let findFullByWebLog webLogId = backgroundTask {
+        let! pages =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM page WHERE web_log_id = @webLogId"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeAsync toPage
+        let! revisions =
+            Sql.existingConnection conn
+            |> Sql.query
+                "SELECT *
+                   FROM page_revision pr
+                        INNER JOIN page p ON p.id = pr.page_id
+                  WHERE p.web_log_id = @webLogId
+                  ORDER BY pr.as_of DESC"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeAsync (fun row -> PageId (row.string "page_id"), Map.toRevision row)
+        return
+            pages
+            |> List.map (fun it ->
+                { it with Revisions = revisions |> List.filter (fun r -> fst r = it.Id) |> List.map snd })
+    }
+    
+    /// Get all listed pages for the given web log (without revisions or text)
+    let findListed webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM page WHERE web_log_id = @webLogId AND is_in_page_list = TRUE ORDER BY LOWER(title)"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync pageWithoutText
+    
+    /// Get a page of pages for the given web log (without revisions)
+    let findPageOfPages webLogId pageNbr =
+        Sql.existingConnection conn
+        |> Sql.query
+            "SELECT *
+               FROM page
+              WHERE web_log_id = @webLogId
+              ORDER BY LOWER(title)
+              LIMIT @pageSize OFFSET @toSkip"
+        |> Sql.parameters [ webLogIdParam webLogId; "@pageSize", Sql.int 26; "@toSkip", Sql.int ((pageNbr - 1) * 25) ]
+        |> Sql.executeAsync toPage
+    
+    /// The INSERT statement for a page
+    let pageInsert =
+        "INSERT INTO page (
+            id, web_log_id, author_id, title, permalink, prior_permalinks, published_on, updated_on, is_in_page_list,
+            template, page_text, meta_items
+        ) VALUES (
+            @id, @webLogId, @authorId, @title, @permalink, @priorPermalinks, @publishedOn, @updatedOn, @isInPageList,
+            @template, @text, @metaItems
+        )"
+    
+    /// The parameters for saving a page
+    let pageParams (page : Page) = [
+        webLogIdParam page.WebLogId
+        "@id",              Sql.string       (PageId.toString page.Id)
+        "@authorId",        Sql.string       (WebLogUserId.toString page.AuthorId)
+        "@title",           Sql.string       page.Title
+        "@permalink",       Sql.string       (Permalink.toString page.Permalink)
+        "@isInPageList",    Sql.bool         page.IsInPageList
+        "@template",        Sql.stringOrNone page.Template
+        "@text",            Sql.string       page.Text
+        "@metaItems",       Sql.jsonb        (Utils.serialize ser page.Metadata)
+        "@priorPermalinks", Sql.stringArray  (page.PriorPermalinks |> List.map Permalink.toString |> Array.ofList)
+        typedParam "publishedOn" page.PublishedOn
+        typedParam "updatedOn"   page.UpdatedOn
+    ]
+
+    /// Restore pages from a backup
+    let restore (pages : Page list) = backgroundTask {
+        let revisions = pages |> List.collect (fun p -> p.Revisions |> List.map (fun r -> p.Id, r))
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.executeTransactionAsync [
+                pageInsert, pages     |> List.map pageParams
+                revInsert,  revisions |> List.map (fun (pageId, rev) -> revParams pageId rev)
+            ]
+        ()
+    }
+    
+    /// Save a page
+    let save (page : Page) = backgroundTask {
+        let! oldPage = findFullById page.Id page.WebLogId
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {pageInsert} ON CONFLICT (id) DO UPDATE
+                SET author_id        = EXCLUDED.author_id,
+                    title            = EXCLUDED.title,
+                    permalink        = EXCLUDED.permalink,
+                    prior_permalinks = EXCLUDED.prior_permalinks,
+                    published_on     = EXCLUDED.published_on,
+                    updated_on       = EXCLUDED.updated_on,
+                    is_in_page_list  = EXCLUDED.is_in_page_list,
+                    template         = EXCLUDED.template,
+                    page_text        = EXCLUDED.page_text,
+                    meta_items       = EXCLUDED.meta_items"
+            |> Sql.parameters (pageParams page)
+            |> Sql.executeNonQueryAsync
+        do! updatePageRevisions page.Id (match oldPage with Some p -> p.Revisions | None -> []) page.Revisions
+        ()
+    }
+    
+    /// Update a page's prior permalinks
+    let updatePriorPermalinks pageId webLogId permalinks = backgroundTask {
+        match! pageExists pageId webLogId with
+        | true ->
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query "UPDATE page SET prior_permalinks = @prior WHERE id = @id"
+                |> Sql.parameters
+                    [   "@id",    Sql.string      (PageId.toString pageId)
+                        "@prior", Sql.stringArray (permalinks |> List.map Permalink.toString |> Array.ofList) ]
+                |> Sql.executeNonQueryAsync
+            return true
+        | false -> return false
+    }
+    
+    interface IPageData with
+        member _.Add page = save page
+        member _.All webLogId = all webLogId
+        member _.CountAll webLogId = countAll webLogId
+        member _.CountListed webLogId = countListed webLogId
+        member _.Delete pageId webLogId = delete pageId webLogId
+        member _.FindById pageId webLogId = findById pageId webLogId
+        member _.FindByPermalink permalink webLogId = findByPermalink permalink webLogId
+        member _.FindCurrentPermalink permalinks webLogId = findCurrentPermalink permalinks webLogId
+        member _.FindFullById pageId webLogId = findFullById pageId webLogId
+        member _.FindFullByWebLog webLogId = findFullByWebLog webLogId
+        member _.FindListed webLogId = findListed webLogId
+        member _.FindPageOfPages webLogId pageNbr = findPageOfPages webLogId pageNbr
+        member _.Restore pages = restore pages
+        member _.Update page = save page
+        member _.UpdatePriorPermalinks pageId webLogId permalinks = updatePriorPermalinks pageId webLogId permalinks

src/MyWebLog.Data/Postgres/PostgresPostData.fs

@@ -0,0 +1,378 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Newtonsoft.Json
+open NodaTime
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog post data implementation        
+type PostgresPostData (conn : NpgsqlConnection, ser : JsonSerializer) =
+
+    // SUPPORT FUNCTIONS
+    
+    /// Append revisions to a post
+    let appendPostRevisions (post : Post) = backgroundTask {
+        let! revisions =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT as_of, revision_text FROM post_revision WHERE post_id = @id ORDER BY as_of DESC"
+            |> Sql.parameters [ "@id", Sql.string (PostId.toString post.Id) ]
+            |> Sql.executeAsync Map.toRevision
+        return { post with Revisions = revisions }
+    }
+    
+    /// The SELECT statement for a post that will include category IDs
+    let selectPost =
+        "SELECT *, ARRAY(SELECT cat.category_id FROM post_category cat WHERE cat.post_id = p.id) AS category_ids
+           FROM post p"
+    
+    /// Shorthand for mapping to a post
+    let toPost = Map.toPost ser
+    
+    /// Return a post with no revisions, prior permalinks, or text
+    let postWithoutText row =
+        { toPost row with Text = "" }
+    
+    /// The INSERT statement for a post/category cross-reference
+    let catInsert = "INSERT INTO post_category VALUES (@postId, @categoryId)"
+    
+    /// Parameters for adding or updating a post/category cross-reference
+    let catParams postId cat = [
+        "@postId",    Sql.string (PostId.toString postId)
+        "categoryId", Sql.string (CategoryId.toString cat)
+    ]
+    
+    /// Update a post's assigned categories
+    let updatePostCategories postId oldCats newCats = backgroundTask {
+        let toDelete, toAdd = Utils.diffLists oldCats newCats CategoryId.toString
+        if not (List.isEmpty toDelete) || not (List.isEmpty toAdd) then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.executeTransactionAsync [
+                    if not (List.isEmpty toDelete) then
+                        "DELETE FROM post_category WHERE post_id = @postId AND category_id = @categoryId",
+                        toDelete |> List.map (catParams postId)
+                    if not (List.isEmpty toAdd) then
+                        catInsert, toAdd |> List.map (catParams postId)
+                ]
+            ()
+    }
+    
+    /// The INSERT statement for a post revision
+    let revInsert = "INSERT INTO post_revision VALUES (@postId, @asOf, @text)"
+    
+    /// The parameters for adding a post revision
+    let revParams postId rev = [
+        typedParam "asOf" rev.AsOf
+        "@postId", Sql.string (PostId.toString postId)
+        "@text",   Sql.string (MarkupText.toString rev.Text)
+    ]
+    
+    /// Update a post's revisions
+    let updatePostRevisions postId oldRevs newRevs = backgroundTask {
+        let toDelete, toAdd = Utils.diffRevisions oldRevs newRevs
+        if not (List.isEmpty toDelete) || not (List.isEmpty toAdd) then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.executeTransactionAsync [
+                    if not (List.isEmpty toDelete) then
+                        "DELETE FROM post_revision WHERE post_id = @postId AND as_of = @asOf",
+                        toDelete
+                        |> List.map (fun it -> [
+                            "@postId", Sql.string (PostId.toString postId)
+                            typedParam "asOf" it.AsOf
+                        ])
+                    if not (List.isEmpty toAdd) then
+                        revInsert, toAdd |> List.map (revParams postId)
+                ]
+            ()
+    }
+    
+    /// Does the given post exist?
+    let postExists postId webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT EXISTS (SELECT 1 FROM post WHERE id = @id AND web_log_id = @webLogId) AS {existsName}"
+        |> Sql.parameters [ "@id", Sql.string (PostId.toString postId); webLogIdParam webLogId ]
+        |> Sql.executeRowAsync Map.toExists
+    
+    // IMPLEMENTATION FUNCTIONS
+    
+    /// Count posts in a status for the given web log
+    let countByStatus status webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT COUNT(id) AS {countName} FROM post WHERE web_log_id = @webLogId AND status = @status"
+        |> Sql.parameters [ webLogIdParam webLogId; "@status", Sql.string (PostStatus.toString status) ]
+        |> Sql.executeRowAsync Map.toCount
+    
+    /// Find a post by its ID for the given web log (excluding revisions)
+    let findById postId webLogId = 
+        Sql.existingConnection conn
+        |> Sql.query $"{selectPost} WHERE id = @id AND web_log_id = @webLogId"
+        |> Sql.parameters [ "@id", Sql.string (PostId.toString postId); webLogIdParam webLogId ]
+        |> Sql.executeAsync toPost
+        |> tryHead
+    
+    /// Find a post by its permalink for the given web log (excluding revisions and prior permalinks)
+    let findByPermalink permalink webLogId =
+        Sql.existingConnection conn
+        |> Sql.query $"{selectPost} WHERE web_log_id = @webLogId AND permalink = @link"
+        |> Sql.parameters [ webLogIdParam webLogId; "@link", Sql.string (Permalink.toString permalink) ]
+        |> Sql.executeAsync toPost
+        |> tryHead
+    
+    /// Find a complete post by its ID for the given web log
+    let findFullById postId webLogId = backgroundTask {
+        match! findById postId webLogId with
+        | Some post ->
+            let! withRevisions = appendPostRevisions post
+            return Some withRevisions
+        | None -> return None
+    }
+    
+    /// Delete a post by its ID for the given web log
+    let delete postId webLogId = backgroundTask {
+        match! postExists postId webLogId with
+        | true ->
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query
+                    "DELETE FROM post_revision WHERE post_id = @id;
+                     DELETE FROM post_category WHERE post_id = @id;
+                     DELETE FROM post          WHERE id      = @id"
+                |> Sql.parameters [ "@id", Sql.string (PostId.toString postId) ]
+                |> Sql.executeNonQueryAsync
+            return true
+        | false -> return false
+    }
+    
+    /// Find the current permalink from a list of potential prior permalinks for the given web log
+    let findCurrentPermalink permalinks webLogId = backgroundTask {
+        if List.isEmpty permalinks then return None
+        else
+            let linkSql, linkParams = arrayInClause "prior_permalinks" Permalink.toString permalinks
+            return!
+                Sql.existingConnection conn
+                |> Sql.query $"SELECT permalink FROM post WHERE web_log_id = @webLogId AND ({linkSql})"
+                |> Sql.parameters (webLogIdParam webLogId :: linkParams)
+                |> Sql.executeAsync Map.toPermalink
+                |> tryHead
+    }
+    
+    /// Get all complete posts for the given web log
+    let findFullByWebLog webLogId = backgroundTask {
+        let! posts =
+            Sql.existingConnection conn
+            |> Sql.query $"{selectPost} WHERE web_log_id = @webLogId"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeAsync toPost
+        let! revisions =
+            Sql.existingConnection conn
+            |> Sql.query
+                "SELECT *
+                   FROM post_revision pr
+                        INNER JOIN post p ON p.id = pr.post_id
+                  WHERE p.web_log_id = @webLogId
+                  ORDER BY as_of DESC"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeAsync (fun row -> PostId (row.string "post_id"), Map.toRevision row)
+        return
+            posts
+            |> List.map (fun it ->
+                { it with Revisions = revisions |> List.filter (fun r -> fst r = it.Id) |> List.map snd })
+    }
+    
+    /// Get a page of categorized posts for the given web log (excludes revisions)
+    let findPageOfCategorizedPosts webLogId categoryIds pageNbr postsPerPage =
+        let catSql, catParams = inClause "AND pc.category_id" "catId" CategoryId.toString categoryIds
+        Sql.existingConnection conn
+        |> Sql.query $"
+            {selectPost}
+                   INNER JOIN post_category pc ON pc.post_id = p.id
+             WHERE p.web_log_id = @webLogId
+               AND p.status     = @status
+               {catSql}
+             ORDER BY published_on DESC
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
+        |> Sql.parameters
+            [   webLogIdParam webLogId
+                "@status", Sql.string (PostStatus.toString Published)
+                yield! catParams   ]
+        |> Sql.executeAsync toPost
+    
+    /// Get a page of posts for the given web log (excludes text and revisions)
+    let findPageOfPosts webLogId pageNbr postsPerPage =
+        Sql.existingConnection conn
+        |> Sql.query $"
+            {selectPost}
+             WHERE web_log_id = @webLogId
+             ORDER BY published_on DESC NULLS FIRST, updated_on
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync postWithoutText
+    
+    /// Get a page of published posts for the given web log (excludes revisions)
+    let findPageOfPublishedPosts webLogId pageNbr postsPerPage =
+        Sql.existingConnection conn
+        |> Sql.query $"
+            {selectPost}
+             WHERE web_log_id = @webLogId
+               AND status     = @status
+             ORDER BY published_on DESC
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
+        |> Sql.parameters [ webLogIdParam webLogId; "@status", Sql.string (PostStatus.toString Published) ]
+        |> Sql.executeAsync toPost
+    
+    /// Get a page of tagged posts for the given web log (excludes revisions and prior permalinks)
+    let findPageOfTaggedPosts webLogId (tag : string) pageNbr postsPerPage =
+        Sql.existingConnection conn
+        |> Sql.query $"
+            {selectPost}
+             WHERE web_log_id =  @webLogId
+               AND status     =  @status
+               AND tags       && ARRAY[@tag]
+             ORDER BY published_on DESC
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
+        |> Sql.parameters
+            [   webLogIdParam webLogId
+                "@status", Sql.string (PostStatus.toString Published)
+                "@tag",    Sql.string tag
+            ]
+        |> Sql.executeAsync toPost
+    
+    /// Find the next newest and oldest post from a publish date for the given web log
+    let findSurroundingPosts webLogId (publishedOn : Instant) = backgroundTask {
+        let queryParams () = Sql.parameters [
+            webLogIdParam webLogId
+            typedParam "publishedOn" publishedOn
+            "@status", Sql.string (PostStatus.toString Published)
+        ]
+        let! older =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {selectPost}
+                 WHERE web_log_id   = @webLogId
+                   AND status       = @status
+                   AND published_on < @publishedOn
+                 ORDER BY published_on DESC
+                 LIMIT 1"
+            |> queryParams ()
+            |> Sql.executeAsync toPost
+        let! newer =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {selectPost}
+                 WHERE web_log_id   = @webLogId
+                   AND status       = @status
+                   AND published_on > @publishedOn
+                 ORDER BY published_on
+                 LIMIT 1"
+            |> queryParams ()
+            |> Sql.executeAsync toPost
+        return List.tryHead older, List.tryHead newer
+    }
+    
+    /// The INSERT statement for a post
+    let postInsert =
+        "INSERT INTO post (
+            id, web_log_id, author_id, status, title, permalink, prior_permalinks, published_on, updated_on,
+            template, post_text, tags, meta_items, episode
+        ) VALUES (
+            @id, @webLogId, @authorId, @status, @title, @permalink, @priorPermalinks, @publishedOn, @updatedOn,
+            @template, @text, @tags, @metaItems, @episode
+        )"
+    
+    /// The parameters for saving a post
+    let postParams (post : Post) = [
+        webLogIdParam post.WebLogId
+        "@id",              Sql.string       (PostId.toString post.Id)
+        "@authorId",        Sql.string       (WebLogUserId.toString post.AuthorId)
+        "@status",          Sql.string       (PostStatus.toString post.Status)
+        "@title",           Sql.string       post.Title
+        "@permalink",       Sql.string       (Permalink.toString post.Permalink)
+        "@template",        Sql.stringOrNone post.Template
+        "@text",            Sql.string       post.Text
+        "@priorPermalinks", Sql.stringArray  (post.PriorPermalinks |> List.map Permalink.toString |> Array.ofList)
+        "@episode",         Sql.jsonbOrNone  (post.Episode |> Option.map (Utils.serialize ser))
+        "@tags", Sql.stringArrayOrNone (if List.isEmpty post.Tags then None else Some (Array.ofList post.Tags))
+        "@metaItems",
+            if List.isEmpty post.Metadata then None else Some (Utils.serialize ser post.Metadata)
+            |> Sql.jsonbOrNone
+        optParam   "publishedOn" post.PublishedOn
+        typedParam "updatedOn"   post.UpdatedOn
+    ]
+    
+    /// Save a post
+    let save (post : Post) = backgroundTask {
+        let! oldPost = findFullById post.Id post.WebLogId
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {postInsert} ON CONFLICT (id) DO UPDATE
+                SET author_id        = EXCLUDED.author_id,
+                    status           = EXCLUDED.status,
+                    title            = EXCLUDED.title,
+                    permalink        = EXCLUDED.permalink,
+                    prior_permalinks = EXCLUDED.prior_permalinks,
+                    published_on     = EXCLUDED.published_on,
+                    updated_on       = EXCLUDED.updated_on,
+                    template         = EXCLUDED.template,
+                    post_text        = EXCLUDED.post_text,
+                    tags             = EXCLUDED.tags,
+                    meta_items       = EXCLUDED.meta_items,
+                    episode          = EXCLUDED.episode"
+            |> Sql.parameters (postParams post)
+            |> Sql.executeNonQueryAsync
+        do! updatePostCategories post.Id (match oldPost with Some p -> p.CategoryIds | None -> []) post.CategoryIds
+        do! updatePostRevisions  post.Id (match oldPost with Some p -> p.Revisions   | None -> []) post.Revisions
+    }
+    
+    /// Restore posts from a backup
+    let restore posts = backgroundTask {
+        let cats      = posts |> List.collect (fun p -> p.CategoryIds |> List.map (fun c -> p.Id, c))
+        let revisions = posts |> List.collect (fun p -> p.Revisions   |> List.map (fun r -> p.Id, r))
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.executeTransactionAsync [
+                postInsert, posts     |> List.map postParams
+                catInsert,  cats      |> List.map (fun (postId, catId) -> catParams postId catId)
+                revInsert,  revisions |> List.map (fun (postId, rev)   -> revParams postId rev)
+            ]
+        ()
+    }
+    
+    /// Update prior permalinks for a post
+    let updatePriorPermalinks postId webLogId permalinks = backgroundTask {
+        match! postExists postId webLogId with
+        | true ->
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query "UPDATE post SET prior_permalinks = @prior WHERE id = @id"
+                |> Sql.parameters
+                    [   "@id",    Sql.string      (PostId.toString postId)
+                        "@prior", Sql.stringArray (permalinks |> List.map Permalink.toString |> Array.ofList) ]
+                |> Sql.executeNonQueryAsync
+            return true
+        | false -> return false
+    }
+    
+    interface IPostData with
+        member _.Add post = save post
+        member _.CountByStatus status webLogId = countByStatus status webLogId
+        member _.Delete postId webLogId = delete postId webLogId
+        member _.FindById postId webLogId = findById postId webLogId
+        member _.FindByPermalink permalink webLogId = findByPermalink permalink webLogId
+        member _.FindCurrentPermalink permalinks webLogId = findCurrentPermalink permalinks webLogId
+        member _.FindFullById postId webLogId = findFullById postId webLogId
+        member _.FindFullByWebLog webLogId = findFullByWebLog webLogId
+        member _.FindPageOfCategorizedPosts webLogId categoryIds pageNbr postsPerPage =
+            findPageOfCategorizedPosts webLogId categoryIds pageNbr postsPerPage
+        member _.FindPageOfPosts webLogId pageNbr postsPerPage = findPageOfPosts webLogId pageNbr postsPerPage
+        member _.FindPageOfPublishedPosts webLogId pageNbr postsPerPage =
+            findPageOfPublishedPosts webLogId pageNbr postsPerPage
+        member _.FindPageOfTaggedPosts webLogId tag pageNbr postsPerPage =
+            findPageOfTaggedPosts webLogId tag pageNbr postsPerPage
+        member _.FindSurroundingPosts webLogId publishedOn = findSurroundingPosts webLogId publishedOn
+        member _.Restore posts = restore posts
+        member _.Update post = save post
+        member _.UpdatePriorPermalinks postId webLogId permalinks = updatePriorPermalinks postId webLogId permalinks

src/MyWebLog.Data/Postgres/PostgresTagMapData.fs

@@ -0,0 +1,109 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog tag mapping data implementation        
+type PostgresTagMapData (conn : NpgsqlConnection) =
+
+    /// Find a tag mapping by its ID for the given web log
+    let findById tagMapId webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM tag_map WHERE id = @id AND web_log_id = @webLogId"
+        |> Sql.parameters [ "@id", Sql.string (TagMapId.toString tagMapId); webLogIdParam webLogId ]
+        |> Sql.executeAsync Map.toTagMap
+        |> tryHead
+    
+    /// Delete a tag mapping for the given web log
+    let delete tagMapId webLogId = backgroundTask {
+        let idParams = [ "@id", Sql.string (TagMapId.toString tagMapId) ]
+        let! exists =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                SELECT EXISTS
+                    (SELECT 1 FROM tag_map WHERE id = @id AND web_log_id = @webLogId)
+                  AS {existsName}"
+            |> Sql.parameters (webLogIdParam webLogId :: idParams)
+            |> Sql.executeRowAsync Map.toExists
+        if exists then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query "DELETE FROM tag_map WHERE id = @id"
+                |> Sql.parameters idParams
+                |> Sql.executeNonQueryAsync
+            return true
+        else return false
+    }
+    
+    /// Find a tag mapping by its URL value for the given web log
+    let findByUrlValue urlValue webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM tag_map WHERE web_log_id = @webLogId AND url_value = @urlValue"
+        |> Sql.parameters [ webLogIdParam webLogId; "@urlValue", Sql.string urlValue ]
+        |> Sql.executeAsync Map.toTagMap
+        |> tryHead
+    
+    /// Get all tag mappings for the given web log
+    let findByWebLog webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM tag_map WHERE web_log_id = @webLogId ORDER BY tag"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync Map.toTagMap
+    
+    /// Find any tag mappings in a list of tags for the given web log
+    let findMappingForTags tags webLogId =
+        let tagSql, tagParams = inClause "AND tag" "tag" id tags
+        Sql.existingConnection conn
+        |> Sql.query $"SELECT * FROM tag_map WHERE web_log_id = @webLogId {tagSql}"
+        |> Sql.parameters (webLogIdParam webLogId :: tagParams)
+        |> Sql.executeAsync Map.toTagMap
+    
+    /// The INSERT statement for a tag mapping
+    let tagMapInsert =
+        "INSERT INTO tag_map (
+            id, web_log_id, tag, url_value
+        ) VALUES (
+            @id, @webLogId, @tag, @urlValue
+        )"
+    
+    /// The parameters for saving a tag mapping
+    let tagMapParams (tagMap : TagMap) = [
+        webLogIdParam tagMap.WebLogId
+        "@id",       Sql.string (TagMapId.toString tagMap.Id)
+        "@tag",      Sql.string tagMap.Tag
+        "@urlValue", Sql.string tagMap.UrlValue
+    ]
+    
+    /// Save a tag mapping
+    let save tagMap = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {tagMapInsert} ON CONFLICT (id) DO UPDATE
+                SET tag       = EXCLUDED.tag,
+                    url_value = EXCLUDED.url_value"
+            |> Sql.parameters (tagMapParams tagMap)
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Restore tag mappings from a backup
+    let restore tagMaps = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.executeTransactionAsync [
+                tagMapInsert, tagMaps |> List.map tagMapParams
+            ]
+        ()
+    }
+    
+    interface ITagMapData with
+        member _.Delete tagMapId webLogId = delete tagMapId webLogId
+        member _.FindById tagMapId webLogId = findById tagMapId webLogId
+        member _.FindByUrlValue urlValue webLogId = findByUrlValue urlValue webLogId
+        member _.FindByWebLog webLogId = findByWebLog webLogId
+        member _.FindMappingForTags tags webLogId = findMappingForTags tags webLogId
+        member _.Save tagMap = save tagMap
+        member _.Restore tagMaps = restore tagMaps

src/MyWebLog.Data/Postgres/PostgresThemeData.fs

@@ -0,0 +1,207 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Npgsql
+open Npgsql.FSharp
+
+/// PostreSQL myWebLog theme data implementation        
+type PostgresThemeData (conn : NpgsqlConnection) =
+    
+    /// Retrieve all themes (except 'admin'; excludes template text)
+    let all () = backgroundTask {
+        let! themes =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM theme WHERE id <> 'admin' ORDER BY id"
+            |> Sql.executeAsync Map.toTheme
+        let! templates =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT name, theme_id FROM theme_template WHERE theme_id <> 'admin' ORDER BY name"
+            |> Sql.executeAsync (fun row -> ThemeId (row.string "theme_id"), Map.toThemeTemplate false row)
+        return
+            themes
+            |> List.map (fun t ->
+                { t with Templates = templates |> List.filter (fun tt -> fst tt = t.Id) |> List.map snd })
+    }
+    
+    /// Does a given theme exist?
+    let exists themeId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT EXISTS (SELECT 1 FROM theme WHERE id = @id) AS does_exist"
+        |> Sql.parameters [ "@id", Sql.string (ThemeId.toString themeId) ]
+        |> Sql.executeRowAsync Map.toExists
+    
+    /// Find a theme by its ID
+    let findById themeId = backgroundTask {
+        let themeIdParam = [ "@id", Sql.string (ThemeId.toString themeId) ]
+        let! theme =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM theme WHERE id = @id"
+            |> Sql.parameters themeIdParam
+            |> Sql.executeAsync Map.toTheme
+            |> tryHead
+        if Option.isSome theme then
+            let! templates =
+                Sql.existingConnection conn
+                |> Sql.query "SELECT * FROM theme_template WHERE theme_id = @id"
+                |> Sql.parameters themeIdParam
+                |> Sql.executeAsync (Map.toThemeTemplate true)
+            return Some { theme.Value with Templates = templates }
+        else return None
+    }
+    
+    /// Find a theme by its ID (excludes the text of templates)
+    let findByIdWithoutText themeId = backgroundTask {
+        match! findById themeId with
+        | Some theme ->
+            return Some {
+                theme with Templates = theme.Templates |> List.map (fun t -> { t with Text = "" })
+            }
+        | None -> return None
+    }
+    
+    /// Delete a theme by its ID
+    let delete themeId = backgroundTask {
+        let idParams = [ "@id", Sql.string (ThemeId.toString themeId) ]
+        let! exists =
+            Sql.existingConnection conn
+            |> Sql.query $"SELECT EXISTS (SELECT 1 FROM theme WHERE id = @id) AS {existsName}"
+            |> Sql.parameters idParams
+            |> Sql.executeRowAsync Map.toExists
+        if exists then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query
+                    "DELETE FROM theme_asset    WHERE theme_id = @id;
+                     DELETE FROM theme_template WHERE theme_id = @id;
+                     DELETE FROM theme          WHERE id       = @id"
+                |> Sql.parameters idParams
+                |> Sql.executeNonQueryAsync
+            return true
+        else return false
+    }
+    
+    /// Save a theme
+    let save (theme : Theme) = backgroundTask {
+        let! oldTheme     = findById theme.Id
+        let  themeIdParam = Sql.string (ThemeId.toString theme.Id)
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query
+                "INSERT INTO theme VALUES (@id, @name, @version)
+                 ON CONFLICT (id) DO UPDATE
+                 SET name    = EXCLUDED.name,
+                     version = EXCLUDED.version"
+            |> Sql.parameters
+                [   "@id",      themeIdParam
+                    "@name",    Sql.string theme.Name
+                    "@version", Sql.string theme.Version ]
+            |> Sql.executeNonQueryAsync
+        
+        let toDelete, _ =
+            Utils.diffLists (oldTheme |> Option.map (fun t -> t.Templates) |> Option.defaultValue [])
+                            theme.Templates (fun t -> t.Name)
+        let toAddOrUpdate =
+            theme.Templates
+            |> List.filter (fun t -> not (toDelete |> List.exists (fun d -> d.Name = t.Name)))
+        
+        if not (List.isEmpty toDelete) || not (List.isEmpty toAddOrUpdate) then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.executeTransactionAsync [
+                    if not (List.isEmpty toDelete) then
+                        "DELETE FROM theme_template WHERE theme_id = @themeId AND name = @name",
+                        toDelete |> List.map (fun tmpl -> [ "@themeId", themeIdParam; "@name", Sql.string tmpl.Name ])
+                    if not (List.isEmpty toAddOrUpdate) then
+                        "INSERT INTO theme_template VALUES (@themeId, @name, @template)
+                         ON CONFLICT (theme_id, name) DO UPDATE
+                         SET template = EXCLUDED.template",
+                        toAddOrUpdate |> List.map (fun tmpl -> [
+                            "@themeId",  themeIdParam
+                            "@name",     Sql.string tmpl.Name
+                            "@template", Sql.string tmpl.Text
+                        ])
+                ]
+            ()
+    }
+    
+    interface IThemeData with
+        member _.All () = all ()
+        member _.Delete themeId = delete themeId
+        member _.Exists themeId = exists themeId
+        member _.FindById themeId = findById themeId
+        member _.FindByIdWithoutText themeId = findByIdWithoutText themeId
+        member _.Save theme = save theme
+
+
+/// PostreSQL myWebLog theme data implementation        
+type PostgresThemeAssetData (conn : NpgsqlConnection) =
+    
+    /// Get all theme assets (excludes data)
+    let all () =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT theme_id, path, updated_on FROM theme_asset"
+        |> Sql.executeAsync (Map.toThemeAsset false)
+    
+    /// Delete all assets for the given theme
+    let deleteByTheme themeId = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query "DELETE FROM theme_asset WHERE theme_id = @themeId"
+            |> Sql.parameters [ "@themeId", Sql.string (ThemeId.toString themeId) ]
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Find a theme asset by its ID
+    let findById assetId =
+        let (ThemeAssetId (ThemeId themeId, path)) = assetId
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM theme_asset WHERE theme_id = @themeId AND path = @path"
+        |> Sql.parameters [ "@themeId", Sql.string themeId; "@path", Sql.string path ]
+        |> Sql.executeAsync (Map.toThemeAsset true)
+        |> tryHead
+    
+    /// Get theme assets for the given theme (excludes data)
+    let findByTheme themeId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT theme_id, path, updated_on FROM theme_asset WHERE theme_id = @themeId"
+        |> Sql.parameters [ "@themeId", Sql.string (ThemeId.toString themeId) ]
+        |> Sql.executeAsync (Map.toThemeAsset false)
+    
+    /// Get theme assets for the given theme
+    let findByThemeWithData themeId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM theme_asset WHERE theme_id = @themeId"
+        |> Sql.parameters [ "@themeId", Sql.string (ThemeId.toString themeId) ]
+        |> Sql.executeAsync (Map.toThemeAsset true)
+    
+    /// Save a theme asset
+    let save (asset : ThemeAsset) = backgroundTask {
+        let (ThemeAssetId (ThemeId themeId, path)) = asset.Id
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query
+                "INSERT INTO theme_asset (
+                    theme_id, path, updated_on, data
+                ) VALUES (
+                    @themeId, @path, @updatedOn, @data
+                ) ON CONFLICT (theme_id, path) DO UPDATE
+                SET updated_on = EXCLUDED.updated_on,
+                    data       = EXCLUDED.data"
+            |> Sql.parameters
+                [   "@themeId", Sql.string themeId
+                    "@path",    Sql.string path
+                    "@data",    Sql.bytea  asset.Data
+                    typedParam "updatedOn" asset.UpdatedOn ]
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    interface IThemeAssetData with
+        member _.All () = all ()
+        member _.DeleteByTheme themeId = deleteByTheme themeId
+        member _.FindById assetId = findById assetId
+        member _.FindByTheme themeId = findByTheme themeId
+        member _.FindByThemeWithData themeId = findByThemeWithData themeId
+        member _.Save asset = save asset

src/MyWebLog.Data/Postgres/PostgresUploadData.fs

@@ -0,0 +1,97 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog uploaded file data implementation        
+type PostgresUploadData (conn : NpgsqlConnection) =
+
+    /// The INSERT statement for an uploaded file
+    let upInsert =
+        "INSERT INTO upload (
+            id, web_log_id, path, updated_on, data
+        ) VALUES (
+            @id, @webLogId, @path, @updatedOn, @data
+        )"
+    
+    /// Parameters for adding an uploaded file
+    let upParams (upload : Upload) = [
+        webLogIdParam upload.WebLogId
+        typedParam "updatedOn" upload.UpdatedOn
+        "@id",   Sql.string (UploadId.toString upload.Id)
+        "@path", Sql.string (Permalink.toString upload.Path)
+        "@data", Sql.bytea  upload.Data
+    ]
+    
+    /// Save an uploaded file
+    let add upload = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query upInsert
+            |> Sql.parameters (upParams upload)
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Delete an uploaded file by its ID
+    let delete uploadId webLogId = backgroundTask {
+        let theParams = [ "@id", Sql.string (UploadId.toString uploadId); webLogIdParam webLogId ]
+        let! path =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT path FROM upload WHERE id = @id AND web_log_id = @webLogId"
+            |> Sql.parameters theParams
+            |> Sql.executeAsync (fun row -> row.string "path")
+            |> tryHead
+        if Option.isSome path then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.query "DELETE FROM upload WHERE id = @id AND web_log_id = @webLogId"
+                |> Sql.parameters theParams
+                |> Sql.executeNonQueryAsync
+            return Ok path.Value
+        else return Error $"""Upload ID {UploadId.toString uploadId} not found"""
+    }
+    
+    /// Find an uploaded file by its path for the given web log
+    let findByPath path webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM upload WHERE web_log_id = @webLogId AND path = @path"
+        |> Sql.parameters [ webLogIdParam webLogId; "@path", Sql.string path ]
+        |> Sql.executeAsync (Map.toUpload true)
+        |> tryHead
+    
+    /// Find all uploaded files for the given web log (excludes data)
+    let findByWebLog webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT id, web_log_id, path, updated_on FROM upload WHERE web_log_id = @webLogId"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync (Map.toUpload false)
+    
+    /// Find all uploaded files for the given web log
+    let findByWebLogWithData webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM upload WHERE web_log_id = @webLogId"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync (Map.toUpload true)
+    
+    /// Restore uploads from a backup
+    let restore uploads = backgroundTask {
+        for batch in uploads |> List.chunkBySize 5 do
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.executeTransactionAsync [
+                    upInsert, batch |> List.map upParams
+                ]
+            ()
+    }
+    
+    interface IUploadData with
+        member _.Add upload = add upload
+        member _.Delete uploadId webLogId = delete uploadId webLogId
+        member _.FindByPath path webLogId = findByPath path webLogId
+        member _.FindByWebLog webLogId = findByWebLog webLogId
+        member _.FindByWebLogWithData webLogId = findByWebLogWithData webLogId
+        member _.Restore uploads = restore uploads
+        

src/MyWebLog.Data/Postgres/PostgresWebLogData.fs

@@ -0,0 +1,238 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Newtonsoft.Json
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog web log data implementation        
+type PostgresWebLogData (conn : NpgsqlConnection, ser : JsonSerializer) =
+    
+    // SUPPORT FUNCTIONS
+    
+    /// The parameters for web log INSERT or web log/RSS options UPDATE statements
+    let rssParams (webLog : WebLog) = [
+        "@isFeedEnabled",     Sql.bool         webLog.Rss.IsFeedEnabled
+        "@feedName",          Sql.string       webLog.Rss.FeedName
+        "@itemsInFeed",       Sql.intOrNone    webLog.Rss.ItemsInFeed
+        "@isCategoryEnabled", Sql.bool         webLog.Rss.IsCategoryEnabled
+        "@isTagEnabled",      Sql.bool         webLog.Rss.IsTagEnabled
+        "@copyright",         Sql.stringOrNone webLog.Rss.Copyright
+    ]
+    
+    /// The parameters for web log INSERT or UPDATE statements
+    let webLogParams (webLog : WebLog) = [
+        "@id",           Sql.string       (WebLogId.toString webLog.Id)
+        "@name",         Sql.string       webLog.Name
+        "@slug",         Sql.string       webLog.Slug
+        "@subtitle",     Sql.stringOrNone webLog.Subtitle
+        "@defaultPage",  Sql.string       webLog.DefaultPage
+        "@postsPerPage", Sql.int          webLog.PostsPerPage
+        "@themeId",      Sql.string       (ThemeId.toString webLog.ThemeId)
+        "@urlBase",      Sql.string       webLog.UrlBase
+        "@timeZone",     Sql.string       webLog.TimeZone
+        "@autoHtmx",     Sql.bool         webLog.AutoHtmx
+        "@uploads",      Sql.string       (UploadDestination.toString webLog.Uploads)
+        yield! rssParams webLog
+    ]
+    
+    /// Shorthand to map a result to a custom feed
+    let toCustomFeed =
+        Map.toCustomFeed ser
+    
+    /// Get the current custom feeds for a web log
+    let getCustomFeeds (webLog : WebLog) =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM web_log_feed WHERE web_log_id = @webLogId"
+        |> Sql.parameters [ webLogIdParam webLog.Id ]
+        |> Sql.executeAsync toCustomFeed
+    
+    /// Append custom feeds to a web log
+    let appendCustomFeeds (webLog : WebLog) = backgroundTask {
+        let! feeds = getCustomFeeds webLog
+        return { webLog with Rss = { webLog.Rss with CustomFeeds = feeds } }
+    }
+    
+    /// The parameters to save a custom feed
+    let feedParams webLogId (feed : CustomFeed) = [
+        webLogIdParam webLogId
+        "@id",      Sql.string      (CustomFeedId.toString feed.Id)
+        "@source",  Sql.string      (CustomFeedSource.toString feed.Source)
+        "@path",    Sql.string      (Permalink.toString feed.Path)
+        "@podcast", Sql.jsonbOrNone (feed.Podcast |> Option.map (Utils.serialize ser))
+    ]
+
+    /// Update the custom feeds for a web log
+    let updateCustomFeeds (webLog : WebLog) = backgroundTask {
+        let! feeds = getCustomFeeds webLog
+        let toDelete, _ = Utils.diffLists feeds webLog.Rss.CustomFeeds (fun it -> $"{CustomFeedId.toString it.Id}")
+        let toId (feed : CustomFeed) = feed.Id
+        let toAddOrUpdate =
+            webLog.Rss.CustomFeeds |> List.filter (fun f -> not (toDelete |> List.map toId |> List.contains f.Id))
+        if not (List.isEmpty toDelete) || not (List.isEmpty toAddOrUpdate) then
+            let! _ =
+                Sql.existingConnection conn
+                |> Sql.executeTransactionAsync [
+                    if not (List.isEmpty toDelete) then
+                        "DELETE FROM web_log_feed WHERE id = @id",
+                        toDelete |> List.map (fun it -> [ "@id", Sql.string (CustomFeedId.toString it.Id) ])
+                    if not (List.isEmpty toAddOrUpdate) then
+                        "INSERT INTO web_log_feed (
+                            id, web_log_id, source, path, podcast
+                        ) VALUES (
+                            @id, @webLogId, @source, @path, @podcast
+                        ) ON CONFLICT (id) DO UPDATE
+                        SET source  = EXCLUDED.source,
+                            path    = EXCLUDED.path,
+                            podcast = EXCLUDED.podcast",
+                        toAddOrUpdate |> List.map (feedParams webLog.Id)
+                ]
+            ()
+    }
+    
+    // IMPLEMENTATION FUNCTIONS
+    
+    /// Add a web log
+    let add webLog = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query
+                "INSERT INTO web_log (
+                    id, name, slug, subtitle, default_page, posts_per_page, theme_id, url_base, time_zone, auto_htmx,
+                    uploads, is_feed_enabled, feed_name, items_in_feed, is_category_enabled, is_tag_enabled, copyright
+                ) VALUES (
+                    @id, @name, @slug, @subtitle, @defaultPage, @postsPerPage, @themeId, @urlBase, @timeZone, @autoHtmx,
+                    @uploads, @isFeedEnabled, @feedName, @itemsInFeed, @isCategoryEnabled, @isTagEnabled, @copyright
+                )"
+            |> Sql.parameters (webLogParams webLog)
+            |> Sql.executeNonQueryAsync
+        do! updateCustomFeeds webLog
+    }
+    
+    /// Retrieve all web logs
+    let all () = backgroundTask {
+        let! webLogs =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM web_log"
+            |> Sql.executeAsync Map.toWebLog
+        let! feeds =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM web_log_feed"
+            |> Sql.executeAsync (fun row -> WebLogId (row.string "web_log_id"), toCustomFeed row)
+        return
+            webLogs
+            |> List.map (fun it ->
+                { it with
+                    Rss =
+                        { it.Rss with
+                            CustomFeeds = feeds |> List.filter (fun (wlId, _) -> wlId = it.Id) |> List.map snd } })
+    }
+    
+    /// Delete a web log by its ID
+    let delete webLogId = backgroundTask {
+        let subQuery table = $"(SELECT id FROM {table} WHERE web_log_id = @webLogId)"
+        let postSubQuery = subQuery "post"
+        let pageSubQuery = subQuery "page"
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                DELETE FROM post_comment  WHERE post_id IN {postSubQuery};
+                DELETE FROM post_revision WHERE post_id IN {postSubQuery};
+                DELETE FROM post_category WHERE post_id IN {postSubQuery};
+                DELETE FROM post          WHERE web_log_id = @webLogId;
+                DELETE FROM page_revision WHERE page_id IN {pageSubQuery};
+                DELETE FROM page          WHERE web_log_id = @webLogId;
+                DELETE FROM category      WHERE web_log_id = @webLogId;
+                DELETE FROM tag_map       WHERE web_log_id = @webLogId;
+                DELETE FROM upload        WHERE web_log_id = @webLogId;
+                DELETE FROM web_log_user  WHERE web_log_id = @webLogId;
+                DELETE FROM web_log_feed  WHERE web_log_id = @webLogId;
+                DELETE FROM web_log       WHERE id         = @webLogId"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Find a web log by its host (URL base)
+    let findByHost url = backgroundTask {
+        let! webLog =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM web_log WHERE url_base = @urlBase"
+            |> Sql.parameters [ "@urlBase", Sql.string url ]
+            |> Sql.executeAsync Map.toWebLog
+            |> tryHead
+        if Option.isSome webLog then
+            let! withFeeds = appendCustomFeeds webLog.Value
+            return Some withFeeds
+        else return None
+    }
+    
+    /// Find a web log by its ID
+    let findById webLogId = backgroundTask {
+        let! webLog =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT * FROM web_log WHERE id = @webLogId"
+            |> Sql.parameters [ webLogIdParam webLogId ]
+            |> Sql.executeAsync Map.toWebLog
+            |> tryHead
+        if Option.isSome webLog then
+            let! withFeeds = appendCustomFeeds webLog.Value
+            return Some withFeeds
+        else return None
+    }
+    
+    /// Update settings for a web log
+    let updateSettings webLog = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query
+                "UPDATE web_log
+                    SET name                = @name,
+                        slug                = @slug,
+                        subtitle            = @subtitle,
+                        default_page        = @defaultPage,
+                        posts_per_page      = @postsPerPage,
+                        theme_id            = @themeId,
+                        url_base            = @urlBase,
+                        time_zone           = @timeZone,
+                        auto_htmx           = @autoHtmx,
+                        uploads             = @uploads,
+                        is_feed_enabled     = @isFeedEnabled,
+                        feed_name           = @feedName,
+                        items_in_feed       = @itemsInFeed,
+                        is_category_enabled = @isCategoryEnabled,
+                        is_tag_enabled      = @isTagEnabled,
+                        copyright           = @copyright
+                  WHERE id = @id"
+            |> Sql.parameters (webLogParams webLog)
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Update RSS options for a web log
+    let updateRssOptions (webLog : WebLog) = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query
+                "UPDATE web_log
+                    SET is_feed_enabled     = @isFeedEnabled,
+                        feed_name           = @feedName,
+                        items_in_feed       = @itemsInFeed,
+                        is_category_enabled = @isCategoryEnabled,
+                        is_tag_enabled      = @isTagEnabled,
+                        copyright           = @copyright
+                  WHERE id = @webLogId"
+            |> Sql.parameters (webLogIdParam webLog.Id :: rssParams webLog)
+            |> Sql.executeNonQueryAsync
+        do! updateCustomFeeds webLog
+    }
+    
+    interface IWebLogData with
+        member _.Add webLog = add webLog
+        member _.All () = all ()
+        member _.Delete webLogId = delete webLogId
+        member _.FindByHost url = findByHost url
+        member _.FindById webLogId = findById webLogId
+        member _.UpdateSettings webLog = updateSettings webLog
+        member _.UpdateRssOptions webLog = updateRssOptions webLog

src/MyWebLog.Data/Postgres/PostgresWebLogUserData.fs

@@ -0,0 +1,149 @@
+namespace MyWebLog.Data.Postgres
+
+open MyWebLog
+open MyWebLog.Data
+open Npgsql
+open Npgsql.FSharp
+
+/// PostgreSQL myWebLog user data implementation        
+type PostgresWebLogUserData (conn : NpgsqlConnection) =
+    
+    /// The INSERT statement for a user
+    let userInsert =
+        "INSERT INTO web_log_user (
+            id, web_log_id, email, first_name, last_name, preferred_name, password_hash, url, access_level,
+            created_on, last_seen_on
+        ) VALUES (
+            @id, @webLogId, @email, @firstName, @lastName, @preferredName, @passwordHash, @url, @accessLevel,
+            @createdOn, @lastSeenOn
+        )"
+    
+    /// Parameters for saving web log users
+    let userParams (user : WebLogUser) = [
+        "@id",            Sql.string       (WebLogUserId.toString user.Id)
+        "@webLogId",      Sql.string       (WebLogId.toString user.WebLogId)
+        "@email",         Sql.string       user.Email
+        "@firstName",     Sql.string       user.FirstName
+        "@lastName",      Sql.string       user.LastName
+        "@preferredName", Sql.string       user.PreferredName
+        "@passwordHash",  Sql.string       user.PasswordHash
+        "@url",           Sql.stringOrNone user.Url
+        "@accessLevel",   Sql.string       (AccessLevel.toString user.AccessLevel)
+        typedParam "createdOn"  user.CreatedOn
+        optParam   "lastSeenOn" user.LastSeenOn
+    ]
+
+    /// Find a user by their ID for the given web log
+    let findById userId webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM web_log_user WHERE id = @id AND web_log_id = @webLogId"
+        |> Sql.parameters [ "@id", Sql.string (WebLogUserId.toString userId); webLogIdParam webLogId ]
+        |> Sql.executeAsync Map.toWebLogUser
+        |> tryHead
+    
+    /// Delete a user if they have no posts or pages
+    let delete userId webLogId = backgroundTask {
+        match! findById userId webLogId with
+        | Some _ ->
+            let userParam = [ "@userId", Sql.string (WebLogUserId.toString userId) ]
+            let! isAuthor =
+                Sql.existingConnection conn
+                |> Sql.query
+                    "SELECT (   EXISTS (SELECT 1 FROM page WHERE author_id = @userId
+                             OR EXISTS (SELECT 1 FROM post WHERE author_id = @userId)) AS does_exist"
+                |> Sql.parameters userParam
+                |> Sql.executeRowAsync Map.toExists
+            if isAuthor then
+                return Error "User has pages or posts; cannot delete"
+            else
+                let! _ =
+                    Sql.existingConnection conn
+                    |> Sql.query "DELETE FROM web_log_user WHERE id = @userId"
+                    |> Sql.parameters userParam
+                    |> Sql.executeNonQueryAsync
+                return Ok true
+        | None -> return Error "User does not exist"
+    }
+    
+    /// Find a user by their e-mail address for the given web log
+    let findByEmail email webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM web_log_user WHERE web_log_id = @webLogId AND email = @email"
+        |> Sql.parameters [ webLogIdParam webLogId; "@email", Sql.string email ]
+        |> Sql.executeAsync Map.toWebLogUser
+        |> tryHead
+    
+    /// Get all users for the given web log
+    let findByWebLog webLogId =
+        Sql.existingConnection conn
+        |> Sql.query "SELECT * FROM web_log_user WHERE web_log_id = @webLogId ORDER BY LOWER(preferred_name)"
+        |> Sql.parameters [ webLogIdParam webLogId ]
+        |> Sql.executeAsync Map.toWebLogUser
+    
+    /// Find the names of users by their IDs for the given web log
+    let findNames webLogId userIds = backgroundTask {
+        let idSql, idParams = inClause "AND id" "id" WebLogUserId.toString userIds
+        let! users =
+            Sql.existingConnection conn
+            |> Sql.query $"SELECT * FROM web_log_user WHERE web_log_id = @webLogId {idSql}"
+            |> Sql.parameters (webLogIdParam webLogId :: idParams)
+            |> Sql.executeAsync Map.toWebLogUser
+        return
+            users
+            |> List.map (fun u -> { Name = WebLogUserId.toString u.Id; Value = WebLogUser.displayName u })
+    }
+    
+    /// Restore users from a backup
+    let restore users = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.executeTransactionAsync [
+                userInsert, users |> List.map userParams
+            ]
+        ()
+    }
+    
+    /// Set a user's last seen date/time to now
+    let setLastSeen userId webLogId = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query "UPDATE web_log_user SET last_seen_on = @lastSeenOn WHERE id = @id AND web_log_id = @webLogId"
+            |> Sql.parameters
+                [   webLogIdParam webLogId
+                    typedParam "lastSeenOn" (Noda.now ())
+                    "@id", Sql.string (WebLogUserId.toString userId) ]
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Save a user
+    let save user = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"
+                {userInsert} ON CONFLICT (id) DO UPDATE
+                SET email          = @email,
+                    first_name     = @firstName,
+                    last_name      = @lastName,
+                    preferred_name = @preferredName,
+                    password_hash  = @passwordHash,
+                    url            = @url,
+                    access_level   = @accessLevel,
+                    created_on     = @createdOn,
+                    last_seen_on   = @lastSeenOn"
+            |> Sql.parameters (userParams user)
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    interface IWebLogUserData with
+        member _.Add user = save user
+        member _.Delete userId webLogId = delete userId webLogId
+        member _.FindByEmail email webLogId = findByEmail email webLogId
+        member _.FindById userId webLogId = findById userId webLogId
+        member _.FindByWebLog webLogId = findByWebLog webLogId
+        member _.FindNames webLogId userIds = findNames webLogId userIds
+        member _.Restore users = restore users
+        member _.SetLastSeen userId webLogId = setLastSeen userId webLogId
+        member _.Update user = save user
+

src/MyWebLog.Data/PostgresData.fs

@@ -0,0 +1,260 @@
+namespace MyWebLog.Data
+
+open Microsoft.Extensions.Logging
+open MyWebLog.Data.Postgres
+open Newtonsoft.Json
+open Npgsql
+open Npgsql.FSharp
+
+/// Data implementation for PostgreSQL
+type PostgresData (conn : NpgsqlConnection, log : ILogger<PostgresData>, ser : JsonSerializer) =
+    
+    /// Create any needed tables
+    let ensureTables () = backgroundTask {
+        let _ = NpgsqlConnection.GlobalTypeMapper.UseNodaTime ()
+        
+        let! tables =
+            Sql.existingConnection conn
+            |> Sql.query "SELECT tablename FROM pg_tables WHERE schemaname = 'public'"
+            |> Sql.executeAsync (fun row -> row.string "tablename")
+        let needsTable table = not (List.contains table tables)
+        let mutable isNew = false
+        
+        let sql = seq {
+            // Theme tables
+            if needsTable "theme" then
+                isNew <- true
+                "CREATE TABLE theme (
+                    id       TEXT NOT NULL PRIMARY KEY,
+                    name     TEXT NOT NULL,
+                    version  TEXT NOT NULL)"
+            if needsTable "theme_template" then
+                "CREATE TABLE theme_template (
+                    theme_id  TEXT NOT NULL REFERENCES theme (id),
+                    name      TEXT NOT NULL,
+                    template  TEXT NOT NULL,
+                    PRIMARY KEY (theme_id, name))"
+            if needsTable "theme_asset" then
+                "CREATE TABLE theme_asset (
+                    theme_id    TEXT        NOT NULL REFERENCES theme (id),
+                    path        TEXT        NOT NULL,
+                    updated_on  TIMESTAMPTZ NOT NULL,
+                    data        BYTEA       NOT NULL,
+                    PRIMARY KEY (theme_id, path))"
+            
+            // Web log tables
+            if needsTable "web_log" then
+                "CREATE TABLE web_log (
+                    id                   TEXT    NOT NULL PRIMARY KEY,
+                    name                 TEXT    NOT NULL,
+                    slug                 TEXT    NOT NULL,
+                    subtitle             TEXT,
+                    default_page         TEXT    NOT NULL,
+                    posts_per_page       INTEGER NOT NULL,
+                    theme_id             TEXT    NOT NULL REFERENCES theme (id),
+                    url_base             TEXT    NOT NULL,
+                    time_zone            TEXT    NOT NULL,
+                    auto_htmx            BOOLEAN NOT NULL DEFAULT FALSE,
+                    uploads              TEXT    NOT NULL,
+                    is_feed_enabled      BOOLEAN NOT NULL DEFAULT FALSE,
+                    feed_name            TEXT    NOT NULL,
+                    items_in_feed        INTEGER,
+                    is_category_enabled  BOOLEAN NOT NULL DEFAULT FALSE,
+                    is_tag_enabled       BOOLEAN NOT NULL DEFAULT FALSE,
+                    copyright            TEXT)"
+                "CREATE INDEX web_log_theme_idx ON web_log (theme_id)"
+            if needsTable "web_log_feed" then
+                "CREATE TABLE web_log_feed (
+                    id          TEXT NOT NULL PRIMARY KEY,
+                    web_log_id  TEXT NOT NULL REFERENCES web_log (id),
+                    source      TEXT NOT NULL,
+                    path        TEXT NOT NULL,
+                    podcast     JSONB)"
+                "CREATE INDEX web_log_feed_web_log_idx ON web_log_feed (web_log_id)"
+            
+            // Category table
+            if needsTable "category" then
+                "CREATE TABLE category (
+                    id           TEXT NOT NULL PRIMARY KEY,
+                    web_log_id   TEXT NOT NULL REFERENCES web_log (id),
+                    name         TEXT NOT NULL,
+                    slug         TEXT NOT NULL,
+                    description  TEXT,
+                    parent_id    TEXT)"
+                "CREATE INDEX category_web_log_idx ON category (web_log_id)"
+            
+            // Web log user table
+            if needsTable "web_log_user" then
+                "CREATE TABLE web_log_user (
+                    id              TEXT        NOT NULL PRIMARY KEY,
+                    web_log_id      TEXT        NOT NULL REFERENCES web_log (id),
+                    email           TEXT        NOT NULL,
+                    first_name      TEXT        NOT NULL,
+                    last_name       TEXT        NOT NULL,
+                    preferred_name  TEXT        NOT NULL,
+                    password_hash   TEXT        NOT NULL,
+                    url             TEXT,
+                    access_level    TEXT        NOT NULL,
+                    created_on      TIMESTAMPTZ NOT NULL,
+                    last_seen_on    TIMESTAMPTZ)"
+                "CREATE INDEX web_log_user_web_log_idx ON web_log_user (web_log_id)"
+                "CREATE INDEX web_log_user_email_idx   ON web_log_user (web_log_id, email)"
+            
+            // Page tables
+            if needsTable "page" then
+                "CREATE TABLE page (
+                    id               TEXT        NOT NULL PRIMARY KEY,
+                    web_log_id       TEXT        NOT NULL REFERENCES web_log (id),
+                    author_id        TEXT        NOT NULL REFERENCES web_log_user (id),
+                    title            TEXT        NOT NULL,
+                    permalink        TEXT        NOT NULL,
+                    prior_permalinks TEXT[]      NOT NULL DEFAULT '{}',
+                    published_on     TIMESTAMPTZ NOT NULL,
+                    updated_on       TIMESTAMPTZ NOT NULL,
+                    is_in_page_list  BOOLEAN     NOT NULL DEFAULT FALSE,
+                    template         TEXT,
+                    page_text        TEXT        NOT NULL,
+                    meta_items       JSONB)"
+                "CREATE INDEX page_web_log_idx   ON page (web_log_id)"
+                "CREATE INDEX page_author_idx    ON page (author_id)"
+                "CREATE INDEX page_permalink_idx ON page (web_log_id, permalink)"
+            if needsTable "page_revision" then
+                "CREATE TABLE page_revision (
+                    page_id        TEXT        NOT NULL REFERENCES page (id),
+                    as_of          TIMESTAMPTZ NOT NULL,
+                    revision_text  TEXT        NOT NULL,
+                    PRIMARY KEY (page_id, as_of))"
+            
+            // Post tables
+            if needsTable "post" then
+                "CREATE TABLE post (
+                    id               TEXT        NOT NULL PRIMARY KEY,
+                    web_log_id       TEXT        NOT NULL REFERENCES web_log (id),
+                    author_id        TEXT        NOT NULL REFERENCES web_log_user (id),
+                    status           TEXT        NOT NULL,
+                    title            TEXT        NOT NULL,
+                    permalink        TEXT        NOT NULL,
+                    prior_permalinks TEXT[]      NOT NULL DEFAULT '{}',
+                    published_on     TIMESTAMPTZ,
+                    updated_on       TIMESTAMPTZ NOT NULL,
+                    template         TEXT,
+                    post_text        TEXT        NOT NULL,
+                    tags             TEXT[],
+                    meta_items       JSONB,
+                    episode          JSONB)"
+                "CREATE INDEX post_web_log_idx   ON post (web_log_id)"
+                "CREATE INDEX post_author_idx    ON post (author_id)"
+                "CREATE INDEX post_status_idx    ON post (web_log_id, status, updated_on)"
+                "CREATE INDEX post_permalink_idx ON post (web_log_id, permalink)"
+            if needsTable "post_category" then
+                "CREATE TABLE post_category (
+                    post_id      TEXT NOT NULL REFERENCES post (id),
+                    category_id  TEXT NOT NULL REFERENCES category (id),
+                    PRIMARY KEY (post_id, category_id))"
+                "CREATE INDEX post_category_category_idx ON post_category (category_id)"
+            if needsTable "post_revision" then
+                "CREATE TABLE post_revision (
+                    post_id        TEXT        NOT NULL REFERENCES post (id),
+                    as_of          TIMESTAMPTZ NOT NULL,
+                    revision_text  TEXT        NOT NULL,
+                    PRIMARY KEY (post_id, as_of))"
+            if needsTable "post_comment" then
+                "CREATE TABLE post_comment (
+                    id              TEXT        NOT NULL PRIMARY KEY,
+                    post_id         TEXT        NOT NULL REFERENCES post(id),
+                    in_reply_to_id  TEXT,
+                    name            TEXT        NOT NULL,
+                    email           TEXT        NOT NULL,
+                    url             TEXT,
+                    status          TEXT        NOT NULL,
+                    posted_on       TIMESTAMPTZ NOT NULL,
+                    comment_text    TEXT        NOT NULL)"
+                "CREATE INDEX post_comment_post_idx ON post_comment (post_id)"
+            
+            // Tag map table
+            if needsTable "tag_map" then
+                "CREATE TABLE tag_map (
+                    id          TEXT NOT NULL PRIMARY KEY,
+                    web_log_id  TEXT NOT NULL REFERENCES web_log (id),
+                    tag         TEXT NOT NULL,
+                    url_value   TEXT NOT NULL)"
+                "CREATE INDEX tag_map_web_log_idx ON tag_map (web_log_id)"
+            
+            // Uploaded file table
+            if needsTable "upload" then
+                "CREATE TABLE upload (
+                    id          TEXT        NOT NULL PRIMARY KEY,
+                    web_log_id  TEXT        NOT NULL REFERENCES web_log (id),
+                    path        TEXT        NOT NULL,
+                    updated_on  TIMESTAMPTZ NOT NULL,
+                    data        BYTEA       NOT NULL)"
+                "CREATE INDEX upload_web_log_idx ON upload (web_log_id)"
+                "CREATE INDEX upload_path_idx    ON upload (web_log_id, path)"
+            
+            // Database version table
+            if needsTable "db_version" then
+                "CREATE TABLE db_version (id TEXT NOT NULL PRIMARY KEY)"
+                $"INSERT INTO db_version VALUES ('{Utils.currentDbVersion}')"
+        }
+        
+        Sql.existingConnection conn
+        |> Sql.executeTransactionAsync
+            (sql
+             |> Seq.map (fun s ->
+                let parts = s.Split ' '
+                if parts[1].ToLowerInvariant () = "table" then
+                    log.LogInformation $"Creating {parts[2]} table..."
+                s, [ [] ])
+             |> List.ofSeq)
+        |> Async.AwaitTask
+        |> Async.RunSynchronously
+        |> ignore
+    }
+    
+    /// Set a specific database version
+    let setDbVersion version = backgroundTask {
+        let! _ =
+            Sql.existingConnection conn
+            |> Sql.query $"DELETE FROM db_version; INSERT INTO db_version VALUES ('%s{version}')"
+            |> Sql.executeNonQueryAsync
+        ()
+    }
+    
+    /// Do required data migration between versions
+    let migrate version = backgroundTask {
+        match version with
+        | Some "v2-rc2" -> ()
+        // Future versions will be inserted here
+        | Some _
+        | None ->
+            log.LogWarning $"Unknown database version; assuming {Utils.currentDbVersion}"
+            do! setDbVersion Utils.currentDbVersion
+    }
+        
+    interface IData with
+        
+        member _.Category   = PostgresCategoryData   conn
+        member _.Page       = PostgresPageData       (conn, ser)
+        member _.Post       = PostgresPostData       (conn, ser)
+        member _.TagMap     = PostgresTagMapData     conn
+        member _.Theme      = PostgresThemeData      conn
+        member _.ThemeAsset = PostgresThemeAssetData conn
+        member _.Upload     = PostgresUploadData     conn
+        member _.WebLog     = PostgresWebLogData     (conn, ser)
+        member _.WebLogUser = PostgresWebLogUserData conn
+        
+        member _.Serializer = ser
+        
+        member _.StartUp () = backgroundTask {
+            do! ensureTables ()
+            
+            let! version =
+                Sql.existingConnection conn
+                |> Sql.query "SELECT id FROM db_version"
+                |> Sql.executeAsync (fun row -> row.string "id")
+                |> tryHead
+            match version with
+            | Some v when v = Utils.currentDbVersion -> ()
+            | Some _
+            | None -> do! migrate version 
+        }

src/MyWebLog.Data/RethinkDbData.fs

@@ -18,6 +18,9 @@ module private RethinkHelpers =
         /// The comment table
         let Comment = "Comment"
         
+        /// The database version table
+        let DbVersion = "DbVersion"
+        
         /// The page table
         let Page = "Page"
         
@@ -43,7 +46,7 @@ module private RethinkHelpers =
         let WebLogUser = "WebLogUser"
 
         /// A list of all tables
-        let all = [ Category; Comment; Page; Post; TagMap; Theme; ThemeAsset; Upload; WebLog; WebLogUser ]
+        let all = [ Category; Comment; DbVersion; Page; Post; TagMap; Theme; ThemeAsset; Upload; WebLog; WebLogUser ]
 
     
     /// Index names for indexes not on a data item's name
@@ -188,6 +191,41 @@ type RethinkDbData (conn : Net.IConnection, config : DataConfig, log : ILogger<R
         write; withRetryDefault; ignoreResult conn
     }
     
+    /// Set a specific database version
+    let setDbVersion (version : string) = backgroundTask {
+        do! rethink {
+            withTable Table.DbVersion
+            delete
+            write; withRetryOnce; ignoreResult conn
+        }
+        do! rethink {
+            withTable Table.DbVersion
+            insert {| Id = version |}
+            write; withRetryOnce; ignoreResult conn
+        }
+    }
+    
+    /// Migrate from v2-rc1 to v2-rc2
+    let migrateV2Rc1ToV2Rc2 () = backgroundTask {
+        let logStep = Utils.logMigrationStep log "v2-rc1 to v2-rc2"
+        logStep "**IMPORTANT**"
+        logStep "See release notes about required backup/restoration for RethinkDB."
+        logStep "If there is an error immediately below this message, this is why."
+        logStep "Setting database version to v2-rc2"
+        do! setDbVersion "v2-rc2"
+    }
+    
+    /// Migrate data between versions
+    let migrate version = backgroundTask {
+        match version with
+        | Some v when v = "v2-rc2" -> ()
+        | Some v when v = "v2-rc1" -> do! migrateV2Rc1ToV2Rc2 ()
+        | Some _
+        | None ->
+            log.LogWarning $"Unknown database version; assuming {Utils.currentDbVersion}"
+            do! setDbVersion Utils.currentDbVersion
+    }
+    
     /// The connection for this instance
     member _.Conn = conn
     
@@ -1079,7 +1117,7 @@ type RethinkDbData (conn : Net.IConnection, config : DataConfig, log : ILogger<R
                         do! rethink {
                             withTable Table.WebLogUser
                             get userId
-                            update [ nameof WebLogUser.empty.LastSeenOn, DateTime.UtcNow :> obj ]
+                            update [ nameof WebLogUser.empty.LastSeenOn, Noda.now () :> obj ]
                             write; withRetryOnce; ignoreResult conn
                         }
                     | None -> ()
@@ -1094,7 +1132,6 @@ type RethinkDbData (conn : Net.IConnection, config : DataConfig, log : ILogger<R
                         nameof user.LastName,      user.LastName
                         nameof user.PreferredName, user.PreferredName
                         nameof user.PasswordHash,  user.PasswordHash
-                        nameof user.Salt,          user.Salt
                         nameof user.Url,           user.Url
                         nameof user.AccessLevel,   user.AccessLevel
                         ]
@@ -1102,6 +1139,9 @@ type RethinkDbData (conn : Net.IConnection, config : DataConfig, log : ILogger<R
                 }
         }
         
+        member _.Serializer =
+            Net.Converter.Serializer
+        
         member _.StartUp () = backgroundTask {
             let! dbs = rethink<string list> { dbList; result; withRetryOnce conn }
             if not (dbs |> List.contains config.Database) then
@@ -1114,6 +1154,14 @@ type RethinkDbData (conn : Net.IConnection, config : DataConfig, log : ILogger<R
                     log.LogInformation $"Creating table {tbl}..."
                     do! rethink { tableCreate tbl [ PrimaryKey "Id" ]; write; withRetryOnce; ignoreResult conn }
 
+            if not (List.contains Table.DbVersion tables) then
+                // Version table added in v2-rc2; this will flag that migration to be run
+                do! rethink {
+                    withTable Table.DbVersion
+                    insert {| Id = "v2-rc1" |}
+                    write; withRetryOnce; ignoreResult conn
+                }
+            
             do! ensureIndexes Table.Category   [ nameof Category.empty.WebLogId ]
             do! ensureIndexes Table.Comment    [ nameof Comment.empty.PostId ]
             do! ensureIndexes Table.Page       [ nameof Page.empty.WebLogId; nameof Page.empty.AuthorId ]
@@ -1122,4 +1170,13 @@ type RethinkDbData (conn : Net.IConnection, config : DataConfig, log : ILogger<R
             do! ensureIndexes Table.Upload     []
             do! ensureIndexes Table.WebLog     [ nameof WebLog.empty.UrlBase ]
             do! ensureIndexes Table.WebLogUser [ nameof WebLogUser.empty.WebLogId ]
+            
+            let! version = rethink<{| Id : string |} list> {
+                 withTable Table.DbVersion
+                 limit 1
+                 result; withRetryOnce conn
+            }
+            match List.tryHead version with
+            | Some v when v.Id = "v2-rc2" -> ()
+            | it -> do! migrate (it |> Option.map (fun x -> x.Id))
         }

src/MyWebLog.Data/SQLite/Helpers.fs

@@ -5,6 +5,8 @@ module MyWebLog.Data.SQLite.Helpers
 open System
 open Microsoft.Data.Sqlite
 open MyWebLog
+open MyWebLog.Data
+open NodaTime.Text
 
 /// Run a command that returns a count
 let count (cmd : SqliteCommand) = backgroundTask {
@@ -12,23 +14,6 @@ let count (cmd : SqliteCommand) = backgroundTask {
     return int (it :?> int64)
 }
 
-/// Get lists of items removed from and added to the given lists
-let diffLists<'T, 'U when 'U : equality> oldItems newItems (f : 'T -> 'U) =
-    let diff compList = fun item -> not (compList |> List.exists (fun other -> f item = f other))
-    List.filter (diff newItems) oldItems, List.filter (diff oldItems) newItems
-
-/// Find meta items added and removed
-let diffMetaItems (oldItems : MetaItem list) newItems =
-    diffLists oldItems newItems (fun item -> $"{item.Name}|{item.Value}")
-
-/// Find the permalinks added and removed
-let diffPermalinks oldLinks newLinks =
-    diffLists oldLinks newLinks Permalink.toString
-
-/// Find the revisions added and removed
-let diffRevisions oldRevs newRevs =
-    diffLists oldRevs newRevs (fun (rev : Revision) -> $"{rev.AsOf.Ticks}|{MarkupText.toString rev.Text}")
-
 /// Create a list of items from the given data reader
 let toList<'T> (it : SqliteDataReader -> 'T) (rdr : SqliteDataReader) =
     seq { while rdr.Read () do it rdr }
@@ -47,6 +32,42 @@ let write (cmd : SqliteCommand) = backgroundTask {
     ()
 }
 
+/// Add a possibly-missing parameter, substituting null for None
+let maybe<'T> (it : 'T option) : obj = match it with Some x -> x :> obj | None -> DBNull.Value
+
+/// Create a value for a Duration
+let durationParam =
+    DurationPattern.Roundtrip.Format
+
+/// Create a value for an Instant
+let instantParam =
+    InstantPattern.General.Format
+
+/// Create an optional value for a Duration
+let maybeDuration =
+    Option.map durationParam >> maybe
+
+/// Create an optional value for an Instant
+let maybeInstant =
+    Option.map instantParam >> maybe
+
+/// Create the SQL and parameters for an IN clause
+let inClause<'T> colNameAndPrefix paramName (valueFunc: 'T -> string) (items : 'T list) =
+    if List.isEmpty items then "", []
+    else
+        let mutable idx = 0
+        items
+        |> List.skip 1
+        |> List.fold (fun (itemS, itemP) it ->
+            idx <- idx + 1
+            $"{itemS}, @%s{paramName}{idx}", (SqliteParameter ($"@%s{paramName}{idx}", valueFunc it) :: itemP))
+            (Seq.ofList items
+             |> Seq.map (fun it ->
+                 $"%s{colNameAndPrefix} IN (@%s{paramName}0", [ SqliteParameter ($"@%s{paramName}0", valueFunc it) ])
+             |> Seq.head)
+        |> function sql, ps -> $"{sql})", ps
+
+
 /// Functions to map domain items from a data reader
 module Map =
     
@@ -73,6 +94,26 @@ module Map =
     /// Get a string value from a data reader
     let getString col (rdr : SqliteDataReader) = rdr.GetString (rdr.GetOrdinal col)
     
+    /// Parse a Duration from the given value
+    let parseDuration value =
+        match DurationPattern.Roundtrip.Parse value with
+        | it when it.Success -> it.Value
+        | it -> raise it.Exception
+    
+    /// Get a Duration value from a data reader
+    let getDuration col rdr =
+        getString col rdr |> parseDuration
+    
+    /// Parse an Instant from the given value
+    let parseInstant value =
+        match InstantPattern.General.Parse value with
+        | it when it.Success -> it.Value
+        | it -> raise it.Exception
+    
+    /// Get an Instant value from a data reader
+    let getInstant col rdr =
+        getString col rdr |> parseInstant
+    
     /// Get a timespan value from a data reader
     let getTimeSpan col (rdr : SqliteDataReader) = rdr.GetTimeSpan (rdr.GetOrdinal col)
     
@@ -96,6 +137,14 @@ module Map =
     let tryString col (rdr : SqliteDataReader) =
         if rdr.IsDBNull (rdr.GetOrdinal col) then None else Some (getString col rdr)
     
+    /// Get a possibly null Duration value from a data reader
+    let tryDuration col rdr =
+        tryString col rdr |> Option.map parseDuration
+    
+    /// Get a possibly null Instant value from a data reader
+    let tryInstant col rdr =
+        tryString col rdr |> Option.map parseInstant
+    
     /// Get a possibly null timespan value from a data reader
     let tryTimeSpan col (rdr : SqliteDataReader) =
         if rdr.IsDBNull (rdr.GetOrdinal col) then None else Some (getTimeSpan col rdr)
@@ -114,100 +163,57 @@ module Map =
         }
     
     /// Create a custom feed from the current row in the given data reader
-    let toCustomFeed rdr : CustomFeed =
-        {   Id      = getString "id"     rdr |> CustomFeedId
-            Source  = getString "source" rdr |> CustomFeedSource.parse
-            Path    = getString "path"   rdr |> Permalink
-            Podcast =
-                if rdr.IsDBNull (rdr.GetOrdinal "title") then
-                    None
-                else
-                    Some {
-                        Title             = getString "title"              rdr
-                        Subtitle          = tryString "subtitle"           rdr
-                        ItemsInFeed       = getInt    "items_in_feed"      rdr
-                        Summary           = getString "summary"            rdr
-                        DisplayedAuthor   = getString "displayed_author"   rdr
-                        Email             = getString "email"              rdr
-                        ImageUrl          = getString "image_url"          rdr |> Permalink
-                        AppleCategory     = getString "apple_category"     rdr
-                        AppleSubcategory  = tryString "apple_subcategory"  rdr
-                        Explicit          = getString "explicit"           rdr |> ExplicitRating.parse
-                        DefaultMediaType  = tryString "default_media_type" rdr
-                        MediaBaseUrl      = tryString "media_base_url"     rdr
-                        PodcastGuid       = tryGuid   "podcast_guid"       rdr
-                        FundingUrl        = tryString "funding_url"        rdr
-                        FundingText       = tryString "funding_text"       rdr
-                        Medium            = tryString "medium"             rdr |> Option.map PodcastMedium.parse
-                    }
-        }
-    
-    /// Create a meta item from the current row in the given data reader
-    let toMetaItem rdr : MetaItem =
-        {   Name  = getString "name"  rdr
-            Value = getString "value" rdr
+    let toCustomFeed ser rdr : CustomFeed =
+        {   Id      = getString "id"      rdr |> CustomFeedId
+            Source  = getString "source"  rdr |> CustomFeedSource.parse
+            Path    = getString "path"    rdr |> Permalink
+            Podcast = tryString "podcast" rdr |> Option.map (Utils.deserialize ser)
         }
     
     /// Create a permalink from the current row in the given data reader
     let toPermalink rdr = getString "permalink" rdr |> Permalink
     
     /// Create a page from the current row in the given data reader
-    let toPage rdr : Page =
+    let toPage ser rdr : Page =
         { Page.empty with
             Id           = getString   "id"              rdr |> PageId
             WebLogId     = getString   "web_log_id"      rdr |> WebLogId
             AuthorId     = getString   "author_id"       rdr |> WebLogUserId
             Title        = getString   "title"           rdr
             Permalink    = toPermalink                   rdr
-            PublishedOn  = getDateTime "published_on"    rdr
-            UpdatedOn    = getDateTime "updated_on"      rdr
+            PublishedOn  = getInstant  "published_on"    rdr
+            UpdatedOn    = getInstant  "updated_on"      rdr
             IsInPageList = getBoolean  "is_in_page_list" rdr
             Template     = tryString   "template"        rdr
             Text         = getString   "page_text"       rdr
+            Metadata     = tryString   "meta_items"   rdr
+                           |> Option.map (Utils.deserialize ser)
+                           |> Option.defaultValue []
         }
     
     /// Create a post from the current row in the given data reader
-    let toPost rdr : Post =
+    let toPost ser rdr : Post =
         { Post.empty with
-            Id             = getString   "id"           rdr |> PostId
-            WebLogId       = getString   "web_log_id"   rdr |> WebLogId
-            AuthorId       = getString   "author_id"    rdr |> WebLogUserId
-            Status         = getString   "status"       rdr |> PostStatus.parse
-            Title          = getString   "title"        rdr
-            Permalink      = toPermalink                rdr
-            PublishedOn    = tryDateTime "published_on" rdr
-            UpdatedOn      = getDateTime "updated_on"   rdr
-            Template       = tryString   "template"     rdr
-            Text           = getString   "post_text"    rdr
-            Episode        =
-                match tryString "media" rdr with
-                | Some media ->
-                    Some {
-                        Media              = media
-                        Length             = getLong     "length"              rdr
-                        Duration           = tryTimeSpan "duration"            rdr
-                        MediaType          = tryString   "media_type"          rdr
-                        ImageUrl           = tryString   "image_url"           rdr
-                        Subtitle           = tryString   "subtitle"            rdr
-                        Explicit           = tryString   "explicit"            rdr |> Option.map ExplicitRating.parse
-                        ChapterFile        = tryString   "chapter_file"        rdr
-                        ChapterType        = tryString   "chapter_type"        rdr
-                        TranscriptUrl      = tryString   "transcript_url"      rdr
-                        TranscriptType     = tryString   "transcript_type"     rdr
-                        TranscriptLang     = tryString   "transcript_lang"     rdr
-                        TranscriptCaptions = tryBoolean  "transcript_captions" rdr
-                        SeasonNumber       = tryInt      "season_number"       rdr
-                        SeasonDescription  = tryString   "season_description"  rdr
-                        EpisodeNumber      = tryString   "episode_number"      rdr |> Option.map Double.Parse
-                        EpisodeDescription = tryString   "episode_description" rdr
-                    }
-                | None -> None
+            Id          = getString   "id"           rdr |> PostId
+            WebLogId    = getString   "web_log_id"   rdr |> WebLogId
+            AuthorId    = getString   "author_id"    rdr |> WebLogUserId
+            Status      = getString   "status"       rdr |> PostStatus.parse
+            Title       = getString   "title"        rdr
+            Permalink   = toPermalink                rdr
+            PublishedOn = tryInstant  "published_on" rdr
+            UpdatedOn   = getInstant  "updated_on"   rdr
+            Template    = tryString   "template"     rdr
+            Text        = getString   "post_text"    rdr
+            Episode     = tryString   "episode"      rdr |> Option.map (Utils.deserialize ser)
+            Metadata    = tryString   "meta_items"   rdr
+                          |> Option.map (Utils.deserialize ser)
+                          |> Option.defaultValue []
         }
     
     /// Create a revision from the current row in the given data reader
     let toRevision rdr : Revision =
-        {   AsOf = getDateTime "as_of"         rdr
-            Text = getString   "revision_text" rdr |> MarkupText.parse
+        {   AsOf = getInstant "as_of"         rdr
+            Text = getString  "revision_text" rdr |> MarkupText.parse
         }
     
     /// Create a tag mapping from the current row in the given data reader
@@ -237,7 +243,7 @@ module Map =
             else
                 [||]
         {   Id        = ThemeAssetId (ThemeId (getString "theme_id" rdr), getString "path" rdr)
-            UpdatedOn = getDateTime "updated_on" rdr
+            UpdatedOn = getInstant "updated_on" rdr
             Data      = assetData
         }
     
@@ -257,10 +263,10 @@ module Map =
                 dataStream.ToArray ()
             else
                 [||]
-        {   Id        = getString   "id"           rdr |> UploadId
-            WebLogId  = getString   "web_log_id"   rdr |> WebLogId
-            Path      = getString   "path"         rdr |> Permalink
-            UpdatedOn = getDateTime "updated_on" rdr
+        {   Id        = getString  "id"         rdr |> UploadId
+            WebLogId  = getString  "web_log_id" rdr |> WebLogId
+            Path      = getString  "path"       rdr |> Permalink
+            UpdatedOn = getInstant "updated_on" rdr
             Data      = data
         }
     
@@ -290,23 +296,19 @@ module Map =
     
     /// Create a web log user from the current row in the given data reader
     let toWebLogUser rdr : WebLogUser =
-        {   Id            = getString   "id"             rdr |> WebLogUserId
-            WebLogId      = getString   "web_log_id"     rdr |> WebLogId
-            Email         = getString   "email"          rdr
-            FirstName     = getString   "first_name"     rdr
-            LastName      = getString   "last_name"      rdr
-            PreferredName = getString   "preferred_name" rdr
-            PasswordHash  = getString   "password_hash"  rdr
-            Salt          = getGuid     "salt"           rdr
-            Url           = tryString   "url"            rdr
-            AccessLevel   = getString   "access_level"   rdr |> AccessLevel.parse
-            CreatedOn     = getDateTime "created_on"     rdr
-            LastSeenOn    = tryDateTime "last_seen_on"   rdr
+        {   Id            = getString  "id"             rdr |> WebLogUserId
+            WebLogId      = getString  "web_log_id"     rdr |> WebLogId
+            Email         = getString  "email"          rdr
+            FirstName     = getString  "first_name"     rdr
+            LastName      = getString  "last_name"      rdr
+            PreferredName = getString  "preferred_name" rdr
+            PasswordHash  = getString  "password_hash"  rdr
+            Url           = tryString  "url"            rdr
+            AccessLevel   = getString  "access_level"   rdr |> AccessLevel.parse
+            CreatedOn     = getInstant "created_on"     rdr
+            LastSeenOn    = tryInstant "last_seen_on"   rdr
         }
 
-/// Add a possibly-missing parameter, substituting null for None
-let maybe<'T> (it : 'T option) : obj = match it with Some x -> x :> obj | None -> DBNull.Value
-
 /// Add a web log ID parameter
 let addWebLogId (cmd : SqliteCommand) webLogId =
     cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString webLogId) |> ignore

src/MyWebLog.Data/SQLite/SQLiteCategoryData.fs

@@ -10,23 +10,23 @@ type SQLiteCategoryData (conn : SqliteConnection) =
     
     /// Add parameters for category INSERT or UPDATE statements
     let addCategoryParameters (cmd : SqliteCommand) (cat : Category) =
-        [   cmd.Parameters.AddWithValue ("@id", CategoryId.toString cat.Id)
-            cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString cat.WebLogId)
-            cmd.Parameters.AddWithValue ("@name", cat.Name)
-            cmd.Parameters.AddWithValue ("@slug", cat.Slug)
+        [   cmd.Parameters.AddWithValue ("@id",          CategoryId.toString cat.Id)
+            cmd.Parameters.AddWithValue ("@webLogId",    WebLogId.toString cat.WebLogId)
+            cmd.Parameters.AddWithValue ("@name",        cat.Name)
+            cmd.Parameters.AddWithValue ("@slug",        cat.Slug)
             cmd.Parameters.AddWithValue ("@description", maybe cat.Description)
-            cmd.Parameters.AddWithValue ("@parentId", maybe (cat.ParentId |> Option.map CategoryId.toString))
+            cmd.Parameters.AddWithValue ("@parentId",    maybe (cat.ParentId |> Option.map CategoryId.toString))
         ] |> ignore
     
     /// Add a category
     let add cat = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            INSERT INTO category (
+        cmd.CommandText <-
+            "INSERT INTO category (
                 id, web_log_id, name, slug, description, parent_id
             ) VALUES (
                 @id, @webLogId, @name, @slug, @description, @parentId
-            )"""
+            )"
         addCategoryParameters cmd cat
         let! _ = cmd.ExecuteNonQueryAsync ()
         ()
@@ -68,24 +68,23 @@ type SQLiteCategoryData (conn : SqliteConnection) =
             ordered
             |> Seq.map (fun it -> backgroundTask {
                 // Parent category post counts include posts in subcategories
+                let catSql, catParams =
+                    ordered
+                    |> Seq.filter (fun cat -> cat.ParentNames |> Array.contains it.Name)
+                    |> Seq.map (fun cat -> cat.Id)
+                    |> Seq.append (Seq.singleton it.Id)
+                    |> List.ofSeq
+                    |> inClause "AND pc.category_id" "catId" id
                 cmd.Parameters.Clear ()
                 addWebLogId cmd webLogId
-                cmd.CommandText <- """
+                cmd.Parameters.AddRange catParams
+                cmd.CommandText <- $"
                     SELECT COUNT(DISTINCT p.id)
                       FROM post p
                            INNER JOIN post_category pc ON pc.post_id = p.id
                      WHERE p.web_log_id = @webLogId
                        AND p.status     = 'Published'
-                       AND pc.category_id IN ("""
-                ordered
-                |> Seq.filter (fun cat -> cat.ParentNames |> Array.contains it.Name)
-                |> Seq.map (fun cat -> cat.Id)
-                |> Seq.append (Seq.singleton it.Id)
-                |> Seq.iteri (fun idx item ->
-                    if idx > 0 then cmd.CommandText <- $"{cmd.CommandText}, "
-                    cmd.CommandText <- $"{cmd.CommandText}@catId{idx}"
-                    cmd.Parameters.AddWithValue ($"@catId{idx}", item) |> ignore)
-                cmd.CommandText <- $"{cmd.CommandText})"
+                       {catSql}"
                 let! postCount = count cmd
                 return it.Id, postCount
                 })
@@ -133,19 +132,15 @@ type SQLiteCategoryData (conn : SqliteConnection) =
                 cmd.Parameters.AddWithValue ("@newParentId", maybe (cat.ParentId |> Option.map CategoryId.toString))
                 |> ignore
                 do! write cmd
-            // Delete the category off all posts where it is assigned
-            cmd.CommandText <- """
-                DELETE FROM post_category
-                 WHERE category_id = @id
-                   AND post_id IN (SELECT id FROM post WHERE web_log_id = @webLogId)"""
+            // Delete the category off all posts where it is assigned, and the category itself
+            cmd.CommandText <-
+                "DELETE FROM post_category
+                  WHERE category_id = @id
+                    AND post_id IN (SELECT id FROM post WHERE web_log_id = @webLogId);
+                 DELETE FROM category WHERE id = @id"
             cmd.Parameters.Clear ()
-            let catIdParameter = cmd.Parameters.AddWithValue ("@id", CategoryId.toString catId)
-            cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString webLogId) |> ignore
-            do! write cmd
-            // Delete the category itself
-            cmd.CommandText <- "DELETE FROM category WHERE id = @id"
-            cmd.Parameters.Clear ()
-            cmd.Parameters.Add catIdParameter |> ignore
+            let _ = cmd.Parameters.AddWithValue ("@id", CategoryId.toString catId)
+            addWebLogId cmd webLogId
             do! write cmd
             return if children = 0 then CategoryDeleted else ReassignedChildCategories
         | None -> return CategoryNotFound
@@ -160,14 +155,14 @@ type SQLiteCategoryData (conn : SqliteConnection) =
     /// Update a category
     let update cat = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            UPDATE category
-               SET name        = @name,
-                   slug        = @slug,
-                   description = @description,
-                   parent_id   = @parentId
-             WHERE id         = @id
-               AND web_log_id = @webLogId"""
+        cmd.CommandText <-
+            "UPDATE category
+                SET name        = @name,
+                    slug        = @slug,
+                    description = @description,
+                    parent_id   = @parentId
+              WHERE id         = @id
+                AND web_log_id = @webLogId"
         addCategoryParameters cmd cat
         do! write cmd
     }

src/MyWebLog.Data/SQLite/SQLitePageData.fs

@@ -4,35 +4,29 @@ open System.Threading.Tasks
 open Microsoft.Data.Sqlite
 open MyWebLog
 open MyWebLog.Data
+open Newtonsoft.Json
 
 /// SQLite myWebLog page data implementation        
-type SQLitePageData (conn : SqliteConnection) =
+type SQLitePageData (conn : SqliteConnection, ser : JsonSerializer) =
     
     // SUPPORT FUNCTIONS
     
     /// Add parameters for page INSERT or UPDATE statements
     let addPageParameters (cmd : SqliteCommand) (page : Page) =
-        [   cmd.Parameters.AddWithValue ("@id", PageId.toString page.Id)
-            cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString page.WebLogId)
-            cmd.Parameters.AddWithValue ("@authorId", WebLogUserId.toString page.AuthorId)
-            cmd.Parameters.AddWithValue ("@title", page.Title)
-            cmd.Parameters.AddWithValue ("@permalink", Permalink.toString page.Permalink)
-            cmd.Parameters.AddWithValue ("@publishedOn", page.PublishedOn)
-            cmd.Parameters.AddWithValue ("@updatedOn", page.UpdatedOn)
+        [   cmd.Parameters.AddWithValue ("@id",           PageId.toString page.Id)
+            cmd.Parameters.AddWithValue ("@webLogId",     WebLogId.toString page.WebLogId)
+            cmd.Parameters.AddWithValue ("@authorId",     WebLogUserId.toString page.AuthorId)
+            cmd.Parameters.AddWithValue ("@title",        page.Title)
+            cmd.Parameters.AddWithValue ("@permalink",    Permalink.toString page.Permalink)
+            cmd.Parameters.AddWithValue ("@publishedOn",  instantParam page.PublishedOn)
+            cmd.Parameters.AddWithValue ("@updatedOn",    instantParam page.UpdatedOn)
             cmd.Parameters.AddWithValue ("@isInPageList", page.IsInPageList)
-            cmd.Parameters.AddWithValue ("@template", maybe page.Template)
-            cmd.Parameters.AddWithValue ("@text", page.Text)
+            cmd.Parameters.AddWithValue ("@template",     maybe page.Template)
+            cmd.Parameters.AddWithValue ("@text",         page.Text)
+            cmd.Parameters.AddWithValue ("@metaItems",    maybe (if List.isEmpty page.Metadata then None
+                                                                 else Some (Utils.serialize ser page.Metadata)))
         ] |> ignore
     
-    /// Append meta items to a page
-    let appendPageMeta (page : Page) = backgroundTask {
-        use cmd = conn.CreateCommand ()
-        cmd.CommandText <- "SELECT name, value FROM page_meta WHERE page_id = @id"
-        cmd.Parameters.AddWithValue ("@id", PageId.toString page.Id) |> ignore
-        use! rdr = cmd.ExecuteReaderAsync ()
-        return { page with Metadata = toList Map.toMetaItem rdr }
-    }
-    
     /// Append revisions and permalinks to a page
     let appendPageRevisionsAndPermalinks (page : Page) = backgroundTask {
         use cmd = conn.CreateCommand ()
@@ -48,47 +42,23 @@ type SQLitePageData (conn : SqliteConnection) =
         return { page with Revisions = toList Map.toRevision rdr }
     }
     
-    /// Return a page with no text (or meta items, prior permalinks, or revisions)
-    let pageWithoutTextOrMeta rdr =
-        { Map.toPage rdr with Text = "" }
+    /// Shorthand for mapping a data reader to a page
+    let toPage =
+        Map.toPage ser
     
-    /// Update a page's metadata items
-    let updatePageMeta pageId oldItems newItems = backgroundTask {
-        let toDelete, toAdd = diffMetaItems oldItems newItems
-        if List.isEmpty toDelete && List.isEmpty toAdd then
-            return ()
-        else
-            use cmd = conn.CreateCommand ()
-            [ cmd.Parameters.AddWithValue ("@pageId", PageId.toString pageId)
-              cmd.Parameters.Add ("@name", SqliteType.Text)
-              cmd.Parameters.Add ("@value", SqliteType.Text)
-            ] |> ignore
-            let runCmd (item : MetaItem) = backgroundTask {
-                cmd.Parameters["@name" ].Value <- item.Name
-                cmd.Parameters["@value"].Value <- item.Value
-                do! write cmd
-            }
-            cmd.CommandText <- "DELETE FROM page_meta WHERE page_id = @pageId AND name = @name AND value = @value" 
-            toDelete
-            |> List.map runCmd
-            |> Task.WhenAll
-            |> ignore
-            cmd.CommandText <- "INSERT INTO page_meta VALUES (@pageId, @name, @value)"
-            toAdd
-            |> List.map runCmd
-            |> Task.WhenAll
-            |> ignore
-    }
+    /// Return a page with no text (or prior permalinks or revisions)
+    let pageWithoutText rdr =
+        { toPage rdr with Text = "" }
     
     /// Update a page's prior permalinks
     let updatePagePermalinks pageId oldLinks newLinks = backgroundTask {
-        let toDelete, toAdd = diffPermalinks oldLinks newLinks
+        let toDelete, toAdd = Utils.diffPermalinks oldLinks newLinks
         if List.isEmpty toDelete && List.isEmpty toAdd then
             return ()
         else
             use cmd = conn.CreateCommand ()
             [ cmd.Parameters.AddWithValue ("@pageId", PageId.toString pageId)
-              cmd.Parameters.Add ("@link", SqliteType.Text)
+              cmd.Parameters.Add          ("@link",   SqliteType.Text)
             ] |> ignore
             let runCmd link = backgroundTask {
                 cmd.Parameters["@link"].Value <- Permalink.toString link
@@ -108,15 +78,15 @@ type SQLitePageData (conn : SqliteConnection) =
     
     /// Update a page's revisions
     let updatePageRevisions pageId oldRevs newRevs = backgroundTask {
-        let toDelete, toAdd = diffRevisions oldRevs newRevs
+        let toDelete, toAdd = Utils.diffRevisions oldRevs newRevs
         if List.isEmpty toDelete && List.isEmpty toAdd then
             return ()
         else
             use cmd = conn.CreateCommand ()
             let runCmd withText rev = backgroundTask {
                 cmd.Parameters.Clear ()
-                [ cmd.Parameters.AddWithValue ("@pageId", PageId.toString pageId)
-                  cmd.Parameters.AddWithValue ("@asOf", rev.AsOf)
+                [   cmd.Parameters.AddWithValue ("@pageId", PageId.toString pageId)
+                    cmd.Parameters.AddWithValue ("@asOf",   instantParam rev.AsOf)
                 ] |> ignore
                 if withText then cmd.Parameters.AddWithValue ("@text", MarkupText.toString rev.Text) |> ignore
                 do! write cmd
@@ -139,17 +109,16 @@ type SQLitePageData (conn : SqliteConnection) =
     let add page = backgroundTask {
         use cmd = conn.CreateCommand ()
         // The page itself
-        cmd.CommandText <- """
-            INSERT INTO page (
+        cmd.CommandText <-
+            "INSERT INTO page (
                 id, web_log_id, author_id, title, permalink, published_on, updated_on, is_in_page_list, template,
-                page_text
+                page_text, meta_items
             ) VALUES (
                 @id, @webLogId, @authorId, @title, @permalink, @publishedOn, @updatedOn, @isInPageList, @template,
-                @text
-            )"""
+                @text, @metaItems
+            )"
         addPageParameters cmd page
         do! write cmd
-        do! updatePageMeta       page.Id [] page.Metadata
         do! updatePagePermalinks page.Id [] page.PriorPermalinks
         do! updatePageRevisions  page.Id [] page.Revisions
     }
@@ -160,7 +129,7 @@ type SQLitePageData (conn : SqliteConnection) =
         cmd.CommandText <- "SELECT * FROM page WHERE web_log_id = @webLogId ORDER BY LOWER(title)"
         addWebLogId cmd webLogId
         use! rdr = cmd.ExecuteReaderAsync ()
-        return toList pageWithoutTextOrMeta rdr
+        return toList pageWithoutText rdr
     }
     
     /// Count all pages for the given web log
@@ -174,11 +143,11 @@ type SQLitePageData (conn : SqliteConnection) =
     /// Count all pages shown in the page list for the given web log
     let countListed webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            SELECT COUNT(id)
-              FROM page
-             WHERE web_log_id      = @webLogId
-               AND is_in_page_list = @isInPageList"""
+        cmd.CommandText <-
+            "SELECT COUNT(id)
+               FROM page
+              WHERE web_log_id      = @webLogId
+                AND is_in_page_list = @isInPageList"
         addWebLogId cmd webLogId
         cmd.Parameters.AddWithValue ("@isInPageList", true) |> ignore
         return! count cmd
@@ -190,11 +159,7 @@ type SQLitePageData (conn : SqliteConnection) =
         cmd.CommandText <- "SELECT * FROM page WHERE id = @id"
         cmd.Parameters.AddWithValue ("@id", PageId.toString pageId) |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
-        match Helpers.verifyWebLog<Page> webLogId (fun it -> it.WebLogId) Map.toPage rdr with
-        | Some page ->
-            let! page = appendPageMeta page
-            return Some page
-        | None -> return None
+        return Helpers.verifyWebLog<Page> webLogId (fun it -> it.WebLogId) (Map.toPage ser) rdr
     }
     
     /// Find a complete page by its ID
@@ -211,11 +176,10 @@ type SQLitePageData (conn : SqliteConnection) =
         | Some _ ->
             use cmd = conn.CreateCommand ()
             cmd.Parameters.AddWithValue ("@id", PageId.toString pageId) |> ignore
-            cmd.CommandText <- """
-                DELETE FROM page_revision  WHERE page_id = @id;
-                DELETE FROM page_permalink WHERE page_id = @id;
-                DELETE FROM page_meta      WHERE page_id = @id;
-                DELETE FROM page           WHERE id      = @id"""
+            cmd.CommandText <-
+                "DELETE FROM page_revision  WHERE page_id = @id;
+                 DELETE FROM page_permalink WHERE page_id = @id;
+                 DELETE FROM page           WHERE id      = @id"
             do! write cmd
             return true
         | None -> return false
@@ -228,29 +192,21 @@ type SQLitePageData (conn : SqliteConnection) =
         addWebLogId cmd webLogId
         cmd.Parameters.AddWithValue ("@link", Permalink.toString permalink) |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
-        if rdr.Read () then
-            let! page = appendPageMeta (Map.toPage rdr)
-            return Some page
-        else
-            return None
+        return if rdr.Read () then Some (toPage rdr) else None
     }
     
     /// Find the current permalink within a set of potential prior permalinks for the given web log
     let findCurrentPermalink permalinks webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
+        let linkSql, linkParams = inClause "AND pp.permalink" "link" Permalink.toString permalinks
+        cmd.CommandText <- $"
             SELECT p.permalink
-              FROM page p
-                   INNER JOIN page_permalink pp ON pp.page_id = p.id
-             WHERE p.web_log_id = @webLogId
-               AND pp.permalink IN ("""
-        permalinks
-        |> List.iteri (fun idx link ->
-            if idx > 0 then cmd.CommandText <- $"{cmd.CommandText}, "
-            cmd.CommandText <- $"{cmd.CommandText}@link{idx}"
-            cmd.Parameters.AddWithValue ($"@link{idx}", Permalink.toString link) |> ignore)
-        cmd.CommandText <- $"{cmd.CommandText})"
+               FROM page p
+                    INNER JOIN page_permalink pp ON pp.page_id = p.id
+              WHERE p.web_log_id = @webLogId
+                {linkSql}"
         addWebLogId cmd webLogId
+        cmd.Parameters.AddRange linkParams
         use! rdr = cmd.ExecuteReaderAsync ()
         return if rdr.Read () then Some (Map.toPermalink rdr) else None
     }
@@ -262,11 +218,8 @@ type SQLitePageData (conn : SqliteConnection) =
         addWebLogId cmd webLogId
         use! rdr = cmd.ExecuteReaderAsync ()
         let! pages =
-            toList Map.toPage rdr
-            |> List.map (fun page -> backgroundTask {
-                let! page = appendPageMeta page
-                return! appendPageRevisionsAndPermalinks page
-            })
+            toList toPage rdr
+            |> List.map (fun page -> backgroundTask { return! appendPageRevisionsAndPermalinks page })
             |> Task.WhenAll
         return List.ofArray pages
     }
@@ -274,37 +227,33 @@ type SQLitePageData (conn : SqliteConnection) =
     /// Get all listed pages for the given web log (without revisions, prior permalinks, or text)
     let findListed webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            SELECT *
-              FROM page
-             WHERE web_log_id      = @webLogId
-               AND is_in_page_list = @isInPageList
-             ORDER BY LOWER(title)"""
+        cmd.CommandText <-
+            "SELECT *
+               FROM page
+              WHERE web_log_id      = @webLogId
+                AND is_in_page_list = @isInPageList
+              ORDER BY LOWER(title)"
         addWebLogId cmd webLogId
         cmd.Parameters.AddWithValue ("@isInPageList", true) |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
-        let! pages =
-            toList pageWithoutTextOrMeta rdr
-            |> List.map (fun page -> backgroundTask { return! appendPageMeta page })
-            |> Task.WhenAll
-        return List.ofArray pages
+        return toList pageWithoutText rdr
     }
     
     /// Get a page of pages for the given web log (without revisions, prior permalinks, or metadata)
     let findPageOfPages webLogId pageNbr = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            SELECT *
-              FROM page
-             WHERE web_log_id = @webLogId
-             ORDER BY LOWER(title)
-             LIMIT @pageSize OFFSET @toSkip"""
+        cmd.CommandText <-
+            "SELECT *
+               FROM page
+              WHERE web_log_id = @webLogId
+              ORDER BY LOWER(title)
+              LIMIT @pageSize OFFSET @toSkip"
         addWebLogId cmd webLogId
-        [ cmd.Parameters.AddWithValue ("@pageSize", 26)
-          cmd.Parameters.AddWithValue ("@toSkip", (pageNbr - 1) * 25)
+        [   cmd.Parameters.AddWithValue ("@pageSize", 26)
+            cmd.Parameters.AddWithValue ("@toSkip",   (pageNbr - 1) * 25)
         ] |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
-        return toList Map.toPage rdr
+        return toList toPage rdr
     }
     
     /// Restore pages from a backup
@@ -318,21 +267,21 @@ type SQLitePageData (conn : SqliteConnection) =
         match! findFullById page.Id page.WebLogId with
         | Some oldPage ->
             use cmd = conn.CreateCommand ()
-            cmd.CommandText <- """
-                UPDATE page
-                   SET author_id       = @authorId,
-                       title           = @title,
-                       permalink       = @permalink,
-                       published_on    = @publishedOn,
-                       updated_on      = @updatedOn,
-                       is_in_page_list = @isInPageList,
-                       template        = @template,
-                       page_text       = @text
-                 WHERE id         = @id
-                   AND web_log_id = @webLogId"""
+            cmd.CommandText <-
+                "UPDATE page
+                    SET author_id       = @authorId,
+                        title           = @title,
+                        permalink       = @permalink,
+                        published_on    = @publishedOn,
+                        updated_on      = @updatedOn,
+                        is_in_page_list = @isInPageList,
+                        template        = @template,
+                        page_text       = @text,
+                        meta_items      = @metaItems
+                  WHERE id         = @id
+                    AND web_log_id = @webLogId"
             addPageParameters cmd page
             do! write cmd
-            do! updatePageMeta       page.Id oldPage.Metadata        page.Metadata
             do! updatePagePermalinks page.Id oldPage.PriorPermalinks page.PriorPermalinks
             do! updatePageRevisions  page.Id oldPage.Revisions       page.Revisions
             return ()

src/MyWebLog.Data/SQLite/SQLitePostData.fs

@@ -1,53 +1,38 @@
 namespace MyWebLog.Data.SQLite
 
-open System
 open System.Threading.Tasks
 open Microsoft.Data.Sqlite
 open MyWebLog
 open MyWebLog.Data
+open Newtonsoft.Json
+open NodaTime
 
 /// SQLite myWebLog post data implementation        
-type SQLitePostData (conn : SqliteConnection) =
+type SQLitePostData (conn : SqliteConnection, ser : JsonSerializer) =
 
     // SUPPORT FUNCTIONS
     
     /// Add parameters for post INSERT or UPDATE statements
     let addPostParameters (cmd : SqliteCommand) (post : Post) =
-        [   cmd.Parameters.AddWithValue ("@id", PostId.toString post.Id)
-            cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString post.WebLogId)
-            cmd.Parameters.AddWithValue ("@authorId", WebLogUserId.toString post.AuthorId)
-            cmd.Parameters.AddWithValue ("@status", PostStatus.toString post.Status)
-            cmd.Parameters.AddWithValue ("@title", post.Title)
-            cmd.Parameters.AddWithValue ("@permalink", Permalink.toString post.Permalink)
-            cmd.Parameters.AddWithValue ("@publishedOn", maybe post.PublishedOn)
-            cmd.Parameters.AddWithValue ("@updatedOn", post.UpdatedOn)
-            cmd.Parameters.AddWithValue ("@template", maybe post.Template)
-            cmd.Parameters.AddWithValue ("@text", post.Text)
+        [   cmd.Parameters.AddWithValue ("@id",          PostId.toString post.Id)
+            cmd.Parameters.AddWithValue ("@webLogId",    WebLogId.toString post.WebLogId)
+            cmd.Parameters.AddWithValue ("@authorId",    WebLogUserId.toString post.AuthorId)
+            cmd.Parameters.AddWithValue ("@status",      PostStatus.toString post.Status)
+            cmd.Parameters.AddWithValue ("@title",       post.Title)
+            cmd.Parameters.AddWithValue ("@permalink",   Permalink.toString post.Permalink)
+            cmd.Parameters.AddWithValue ("@publishedOn", maybeInstant post.PublishedOn)
+            cmd.Parameters.AddWithValue ("@updatedOn",   instantParam post.UpdatedOn)
+            cmd.Parameters.AddWithValue ("@template",    maybe post.Template)
+            cmd.Parameters.AddWithValue ("@text",        post.Text)
+            cmd.Parameters.AddWithValue ("@episode",     maybe (if Option.isSome post.Episode then
+                                                                    Some (Utils.serialize ser post.Episode)
+                                                                else None))
+            cmd.Parameters.AddWithValue ("@metaItems",   maybe (if List.isEmpty post.Metadata then None
+                                                                else Some (Utils.serialize ser post.Metadata)))
         ] |> ignore
     
-    /// Add parameters for episode INSERT or UPDATE statements
-    let addEpisodeParameters (cmd : SqliteCommand) (ep : Episode) =
-        [   cmd.Parameters.AddWithValue ("@media", ep.Media)
-            cmd.Parameters.AddWithValue ("@length", ep.Length)
-            cmd.Parameters.AddWithValue ("@duration", maybe ep.Duration)
-            cmd.Parameters.AddWithValue ("@mediaType", maybe ep.MediaType)
-            cmd.Parameters.AddWithValue ("@imageUrl", maybe ep.ImageUrl)
-            cmd.Parameters.AddWithValue ("@subtitle", maybe ep.Subtitle)
-            cmd.Parameters.AddWithValue ("@explicit", maybe (ep.Explicit |> Option.map ExplicitRating.toString))
-            cmd.Parameters.AddWithValue ("@chapterFile", maybe ep.ChapterFile)
-            cmd.Parameters.AddWithValue ("@chapterType", maybe ep.ChapterType)
-            cmd.Parameters.AddWithValue ("@transcriptUrl", maybe ep.TranscriptUrl)
-            cmd.Parameters.AddWithValue ("@transcriptType", maybe ep.TranscriptType)
-            cmd.Parameters.AddWithValue ("@transcriptLang", maybe ep.TranscriptLang)
-            cmd.Parameters.AddWithValue ("@transcriptCaptions", maybe ep.TranscriptCaptions)
-            cmd.Parameters.AddWithValue ("@seasonNumber", maybe ep.SeasonNumber)
-            cmd.Parameters.AddWithValue ("@seasonDescription", maybe ep.SeasonDescription)
-            cmd.Parameters.AddWithValue ("@episodeNumber", maybe (ep.EpisodeNumber |> Option.map string))
-            cmd.Parameters.AddWithValue ("@episodeDescription", maybe ep.EpisodeDescription)
-        ] |> ignore
-        
-    /// Append category IDs, tags, and meta items to a post
-    let appendPostCategoryTagAndMeta (post : Post) = backgroundTask {
+    /// Append category IDs and tags to a post
+    let appendPostCategoryAndTag (post : Post) = backgroundTask {
         use cmd = conn.CreateCommand ()
         cmd.Parameters.AddWithValue ("@id", PostId.toString post.Id) |> ignore
         
@@ -58,12 +43,7 @@ type SQLitePostData (conn : SqliteConnection) =
         
         cmd.CommandText <- "SELECT tag FROM post_tag WHERE post_id = @id"
         use! rdr = cmd.ExecuteReaderAsync ()
-        let post = { post with Tags = toList (Map.getString "tag") rdr }
-        do! rdr.CloseAsync ()
-        
-        cmd.CommandText <- "SELECT name, value FROM post_meta WHERE post_id = @id"
-        use! rdr = cmd.ExecuteReaderAsync ()
-        return { post with Metadata = toList Map.toMetaItem rdr }
+        return { post with Tags = toList (Map.getString "tag") rdr }
     }
     
     /// Append revisions and permalinks to a post
@@ -82,7 +62,11 @@ type SQLitePostData (conn : SqliteConnection) =
     }
     
     /// The SELECT statement for a post that will include episode data, if it exists
-    let selectPost = "SELECT p.*, e.* FROM post p LEFT JOIN post_episode e ON e.post_id = p.id"
+    let selectPost = "SELECT p.* FROM post p"
+    
+    /// Shorthand for mapping a data reader to a post
+    let toPost =
+        Map.toPost ser
     
     /// Find just-the-post by its ID for the given web log (excludes category, tag, meta, revisions, and permalinks)
     let findPostById postId webLogId = backgroundTask {
@@ -90,22 +74,22 @@ type SQLitePostData (conn : SqliteConnection) =
         cmd.CommandText <- $"{selectPost} WHERE p.id = @id"
         cmd.Parameters.AddWithValue ("@id", PostId.toString postId) |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
-        return Helpers.verifyWebLog<Post> webLogId (fun p -> p.WebLogId) Map.toPost rdr
+        return Helpers.verifyWebLog<Post> webLogId (fun p -> p.WebLogId) toPost rdr
     }
     
     /// Return a post with no revisions, prior permalinks, or text
     let postWithoutText rdr =
-        { Map.toPost rdr with Text = "" }
+        { toPost rdr with Text = "" }
     
     /// Update a post's assigned categories
     let updatePostCategories postId oldCats newCats = backgroundTask {
-        let toDelete, toAdd = diffLists oldCats newCats CategoryId.toString
+        let toDelete, toAdd = Utils.diffLists oldCats newCats CategoryId.toString
         if List.isEmpty toDelete && List.isEmpty toAdd then
             return ()
         else
             use cmd = conn.CreateCommand ()
-            [ cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
-              cmd.Parameters.Add ("@categoryId", SqliteType.Text)
+            [   cmd.Parameters.AddWithValue ("@postId",     PostId.toString postId)
+                cmd.Parameters.Add          ("@categoryId", SqliteType.Text)
             ] |> ignore
             let runCmd catId = backgroundTask {
                 cmd.Parameters["@categoryId"].Value <- CategoryId.toString catId
@@ -125,13 +109,13 @@ type SQLitePostData (conn : SqliteConnection) =
     
     /// Update a post's assigned categories
     let updatePostTags postId (oldTags : string list) newTags = backgroundTask {
-        let toDelete, toAdd = diffLists oldTags newTags id
+        let toDelete, toAdd = Utils.diffLists oldTags newTags id
         if List.isEmpty toDelete && List.isEmpty toAdd then
             return ()
         else
             use cmd = conn.CreateCommand ()
-            [ cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
-              cmd.Parameters.Add ("@tag", SqliteType.Text)
+            [   cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
+                cmd.Parameters.Add          ("@tag",    SqliteType.Text)
             ] |> ignore
             let runCmd (tag : string) = backgroundTask {
                 cmd.Parameters["@tag"].Value <- tag
@@ -149,95 +133,15 @@ type SQLitePostData (conn : SqliteConnection) =
             |> ignore
     }
     
-    /// Update an episode
-    let updatePostEpisode (post : Post) = backgroundTask {
-        use cmd = conn.CreateCommand ()
-        cmd.CommandText <- "SELECT COUNT(post_id) FROM post_episode WHERE post_id = @postId"
-        cmd.Parameters.AddWithValue ("@postId", PostId.toString post.Id) |> ignore
-        let! count = count cmd
-        if count = 1 then
-            match post.Episode with
-            | Some ep ->
-                cmd.CommandText <- """
-                    UPDATE post_episode
-                       SET media               = @media,
-                           length              = @length,
-                           duration            = @duration,
-                           media_type          = @mediaType,
-                           image_url           = @imageUrl,
-                           subtitle            = @subtitle,
-                           explicit            = @explicit,
-                           chapter_file        = @chapterFile,
-                           chapter_type        = @chapterType,
-                           transcript_url      = @transcriptUrl,
-                           transcript_type     = @transcriptType,
-                           transcript_lang     = @transcriptLang,
-                           transcript_captions = @transcriptCaptions,
-                           season_number       = @seasonNumber,
-                           season_description  = @seasonDescription,
-                           episode_number      = @episodeNumber,
-                           episode_description = @episodeDescription
-                     WHERE post_id = @postId"""
-                addEpisodeParameters cmd ep
-                do! write cmd
-            | None ->
-                cmd.CommandText <- "DELETE FROM post_episode WHERE post_id = @postId"
-                do! write cmd
-        else
-            match post.Episode with
-            | Some ep ->
-                cmd.CommandText <- """
-                    INSERT INTO post_episode (
-                        post_id, media, length, duration, media_type, image_url, subtitle, explicit, chapter_file,
-                        chapter_type, transcript_url, transcript_type, transcript_lang, transcript_captions,
-                        season_number, season_description, episode_number, episode_description
-                    ) VALUES (
-                        @postId, @media, @length, @duration, @mediaType, @imageUrl, @subtitle, @explicit, @chapterFile,
-                        @chapterType, @transcriptUrl, @transcriptType, @transcriptLang, @transcriptCaptions,
-                        @seasonNumber, @seasonDescription, @episodeNumber, @episodeDescription
-                    )"""
-                addEpisodeParameters cmd ep
-                do! write cmd
-            | None -> ()
-    }
-    
-    /// Update a post's metadata items
-    let updatePostMeta postId oldItems newItems = backgroundTask {
-        let toDelete, toAdd = diffMetaItems oldItems newItems
-        if List.isEmpty toDelete && List.isEmpty toAdd then
-            return ()
-        else
-            use cmd = conn.CreateCommand ()
-            [ cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
-              cmd.Parameters.Add ("@name", SqliteType.Text)
-              cmd.Parameters.Add ("@value", SqliteType.Text)
-            ] |> ignore
-            let runCmd (item : MetaItem) = backgroundTask {
-                cmd.Parameters["@name" ].Value <- item.Name
-                cmd.Parameters["@value"].Value <- item.Value
-                do! write cmd
-            }
-            cmd.CommandText <- "DELETE FROM post_meta WHERE post_id = @postId AND name = @name AND value = @value" 
-            toDelete
-            |> List.map runCmd
-            |> Task.WhenAll
-            |> ignore
-            cmd.CommandText <- "INSERT INTO post_meta VALUES (@postId, @name, @value)"
-            toAdd
-            |> List.map runCmd
-            |> Task.WhenAll
-            |> ignore
-    }
-    
     /// Update a post's prior permalinks
     let updatePostPermalinks postId oldLinks newLinks = backgroundTask {
-        let toDelete, toAdd = diffPermalinks oldLinks newLinks
+        let toDelete, toAdd = Utils.diffPermalinks oldLinks newLinks
         if List.isEmpty toDelete && List.isEmpty toAdd then
             return ()
         else
             use cmd = conn.CreateCommand ()
-            [ cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
-              cmd.Parameters.Add ("@link", SqliteType.Text)
+            [   cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
+                cmd.Parameters.Add          ("@link",   SqliteType.Text)
             ] |> ignore
             let runCmd link = backgroundTask {
                 cmd.Parameters["@link"].Value <- Permalink.toString link
@@ -257,15 +161,15 @@ type SQLitePostData (conn : SqliteConnection) =
     
     /// Update a post's revisions
     let updatePostRevisions postId oldRevs newRevs = backgroundTask {
-        let toDelete, toAdd = diffRevisions oldRevs newRevs
+        let toDelete, toAdd = Utils.diffRevisions oldRevs newRevs
         if List.isEmpty toDelete && List.isEmpty toAdd then
             return ()
         else
             use cmd = conn.CreateCommand ()
             let runCmd withText rev = backgroundTask {
                 cmd.Parameters.Clear ()
-                [ cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
-                  cmd.Parameters.AddWithValue ("@asOf", rev.AsOf)
+                [   cmd.Parameters.AddWithValue ("@postId", PostId.toString postId)
+                    cmd.Parameters.AddWithValue ("@asOf",   instantParam rev.AsOf)
                 ] |> ignore
                 if withText then cmd.Parameters.AddWithValue ("@text", MarkupText.toString rev.Text) |> ignore
                 do! write cmd
@@ -287,18 +191,18 @@ type SQLitePostData (conn : SqliteConnection) =
     /// Add a post
     let add post = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            INSERT INTO post (
-                id, web_log_id, author_id, status, title, permalink, published_on, updated_on, template, post_text
+        cmd.CommandText <-
+            "INSERT INTO post (
+                id, web_log_id, author_id, status, title, permalink, published_on, updated_on, template, post_text,
+                episode, meta_items
             ) VALUES (
-                @id, @webLogId, @authorId, @status, @title, @permalink, @publishedOn, @updatedOn, @template, @text
-            )"""
+                @id, @webLogId, @authorId, @status, @title, @permalink, @publishedOn, @updatedOn, @template, @text,
+                @episode, @metaItems
+            )"
         addPostParameters cmd post
         do! write cmd
         do! updatePostCategories post.Id [] post.CategoryIds
         do! updatePostTags       post.Id [] post.Tags
-        do! updatePostEpisode    post
-        do! updatePostMeta       post.Id [] post.Metadata
         do! updatePostPermalinks post.Id [] post.PriorPermalinks
         do! updatePostRevisions  post.Id [] post.Revisions
     }
@@ -316,7 +220,7 @@ type SQLitePostData (conn : SqliteConnection) =
     let findById postId webLogId = backgroundTask {
         match! findPostById postId webLogId with
         | Some post ->
-            let! post = appendPostCategoryTagAndMeta post
+            let! post = appendPostCategoryAndTag post
             return Some post
         | None -> return None
     }
@@ -329,7 +233,7 @@ type SQLitePostData (conn : SqliteConnection) =
         cmd.Parameters.AddWithValue ("@link", Permalink.toString permalink) |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
         if rdr.Read () then
-            let! post = appendPostCategoryTagAndMeta (Map.toPost rdr)
+            let! post = appendPostCategoryAndTag (toPost rdr)
             return Some post
         else
             return None
@@ -350,14 +254,13 @@ type SQLitePostData (conn : SqliteConnection) =
         | Some _ ->
             use cmd = conn.CreateCommand ()
             cmd.Parameters.AddWithValue ("@id", PostId.toString postId) |> ignore
-            cmd.CommandText <- """
-                DELETE FROM post_revision  WHERE post_id = @id;
-                DELETE FROM post_permalink WHERE post_id = @id;
-                DELETE FROM post_meta      WHERE post_id = @id;
-                DELETE FROM post_episode   WHERE post_id = @id;
-                DELETE FROM post_tag       WHERE post_id = @id;
-                DELETE FROM post_category  WHERE post_id = @id;
-                DELETE FROM post           WHERE id      = @id"""
+            cmd.CommandText <-
+                "DELETE FROM post_revision  WHERE post_id = @id;
+                 DELETE FROM post_permalink WHERE post_id = @id;
+                 DELETE FROM post_tag       WHERE post_id = @id;
+                 DELETE FROM post_category  WHERE post_id = @id;
+                 DELETE FROM post_comment   WHERE post_id = @id;
+                 DELETE FROM post           WHERE id      = @id"
             do! write cmd
             return true
         | None -> return false
@@ -366,19 +269,15 @@ type SQLitePostData (conn : SqliteConnection) =
     /// Find the current permalink from a list of potential prior permalinks for the given web log
     let findCurrentPermalink permalinks webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
+        let linkSql, linkParams = inClause "AND pp.permalink" "link" Permalink.toString permalinks
+        cmd.CommandText <- $"
             SELECT p.permalink
-              FROM post p
-                   INNER JOIN post_permalink pp ON pp.post_id = p.id
-             WHERE p.web_log_id = @webLogId
-               AND pp.permalink IN ("""
-        permalinks
-        |> List.iteri (fun idx link ->
-            if idx > 0 then cmd.CommandText <- $"{cmd.CommandText}, "
-            cmd.CommandText <- $"{cmd.CommandText}@link{idx}"
-            cmd.Parameters.AddWithValue ($"@link{idx}", Permalink.toString link) |> ignore)
-        cmd.CommandText <- $"{cmd.CommandText})"
+               FROM post p
+                    INNER JOIN post_permalink pp ON pp.post_id = p.id
+              WHERE p.web_log_id = @webLogId
+                {linkSql}"
         addWebLogId cmd webLogId
+        cmd.Parameters.AddRange linkParams
         use! rdr = cmd.ExecuteReaderAsync ()
         return if rdr.Read () then Some (Map.toPermalink rdr) else None
     }
@@ -390,9 +289,9 @@ type SQLitePostData (conn : SqliteConnection) =
         addWebLogId cmd webLogId
         use! rdr = cmd.ExecuteReaderAsync ()
         let! posts =
-            toList Map.toPost rdr
+            toList toPost rdr
             |> List.map (fun post -> backgroundTask {
-                let! post = appendPostCategoryTagAndMeta post
+                let! post = appendPostCategoryAndTag post
                 return! appendPostRevisionsAndPermalinks post
             })
             |> Task.WhenAll
@@ -402,27 +301,22 @@ type SQLitePostData (conn : SqliteConnection) =
     /// Get a page of categorized posts for the given web log (excludes revisions and prior permalinks)
     let findPageOfCategorizedPosts webLogId categoryIds pageNbr postsPerPage = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- $"""
+        let catSql, catParams = inClause "AND pc.category_id" "catId" CategoryId.toString categoryIds
+        cmd.CommandText <- $"
             {selectPost}
                    INNER JOIN post_category pc ON pc.post_id = p.id
              WHERE p.web_log_id = @webLogId
                AND p.status     = @status
-               AND pc.category_id IN ("""
-        categoryIds
-        |> List.iteri (fun idx catId ->
-            if idx > 0 then cmd.CommandText <- $"{cmd.CommandText}, "
-            cmd.CommandText <- $"{cmd.CommandText}@catId{idx}"
-            cmd.Parameters.AddWithValue ($"@catId{idx}", CategoryId.toString catId) |> ignore)
-        cmd.CommandText <-
-            $"""{cmd.CommandText})
-                ORDER BY published_on DESC
-                LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"""
+               {catSql}
+             ORDER BY published_on DESC
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
         addWebLogId cmd webLogId
         cmd.Parameters.AddWithValue ("@status", PostStatus.toString Published) |> ignore
+        cmd.Parameters.AddRange catParams
         use! rdr = cmd.ExecuteReaderAsync ()
         let! posts =
-            toList Map.toPost rdr
-            |> List.map (fun post -> backgroundTask { return! appendPostCategoryTagAndMeta post })
+            toList toPost rdr
+            |> List.map (fun post -> backgroundTask { return! appendPostCategoryAndTag post })
             |> Task.WhenAll
         return List.ofArray posts
     }
@@ -430,16 +324,16 @@ type SQLitePostData (conn : SqliteConnection) =
     /// Get a page of posts for the given web log (excludes text, revisions, and prior permalinks)
     let findPageOfPosts webLogId pageNbr postsPerPage = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- $"""
+        cmd.CommandText <- $"
             {selectPost}
-              WHERE p.web_log_id = @webLogId
-              ORDER BY p.published_on DESC NULLS FIRST, p.updated_on
-              LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"""
+             WHERE p.web_log_id = @webLogId
+             ORDER BY p.published_on DESC NULLS FIRST, p.updated_on
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
         addWebLogId cmd webLogId
         use! rdr = cmd.ExecuteReaderAsync ()
         let! posts =
             toList postWithoutText rdr
-            |> List.map (fun post -> backgroundTask { return! appendPostCategoryTagAndMeta post })
+            |> List.map (fun post -> backgroundTask { return! appendPostCategoryAndTag post })
             |> Task.WhenAll
         return List.ofArray posts
     }
@@ -447,18 +341,18 @@ type SQLitePostData (conn : SqliteConnection) =
     /// Get a page of published posts for the given web log (excludes revisions and prior permalinks)
     let findPageOfPublishedPosts webLogId pageNbr postsPerPage = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- $"""
+        cmd.CommandText <- $"
             {selectPost}
-              WHERE p.web_log_id = @webLogId
-                AND p.status     = @status
-              ORDER BY p.published_on DESC
-              LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"""
+             WHERE p.web_log_id = @webLogId
+               AND p.status     = @status
+             ORDER BY p.published_on DESC
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
         addWebLogId cmd webLogId
         cmd.Parameters.AddWithValue ("@status", PostStatus.toString Published) |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
         let! posts =
-            toList Map.toPost rdr
-            |> List.map (fun post -> backgroundTask { return! appendPostCategoryTagAndMeta post })
+            toList toPost rdr
+            |> List.map (fun post -> backgroundTask { return! appendPostCategoryAndTag post })
             |> Task.WhenAll
         return List.ofArray posts
     }
@@ -466,60 +360,60 @@ type SQLitePostData (conn : SqliteConnection) =
     /// Get a page of tagged posts for the given web log (excludes revisions and prior permalinks)
     let findPageOfTaggedPosts webLogId (tag : string) pageNbr postsPerPage = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- $"""
+        cmd.CommandText <- $"
             {selectPost}
-                    INNER JOIN post_tag pt ON pt.post_id = p.id
-              WHERE p.web_log_id = @webLogId
-                AND p.status     = @status
-                AND pt.tag       = @tag
-              ORDER BY p.published_on DESC
-              LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"""
+                   INNER JOIN post_tag pt ON pt.post_id = p.id
+             WHERE p.web_log_id = @webLogId
+               AND p.status     = @status
+               AND pt.tag       = @tag
+             ORDER BY p.published_on DESC
+             LIMIT {postsPerPage + 1} OFFSET {(pageNbr - 1) * postsPerPage}"
         addWebLogId cmd webLogId
         [ cmd.Parameters.AddWithValue ("@status", PostStatus.toString Published)
           cmd.Parameters.AddWithValue ("@tag", tag)
         ] |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
         let! posts =
-            toList Map.toPost rdr
-            |> List.map (fun post -> backgroundTask { return! appendPostCategoryTagAndMeta post })
+            toList toPost rdr
+            |> List.map (fun post -> backgroundTask { return! appendPostCategoryAndTag post })
             |> Task.WhenAll
         return List.ofArray posts
     }
     
     /// Find the next newest and oldest post from a publish date for the given web log
-    let findSurroundingPosts webLogId (publishedOn : DateTime) = backgroundTask {
+    let findSurroundingPosts webLogId (publishedOn : Instant) = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- $"""
+        cmd.CommandText <- $"
             {selectPost}
              WHERE p.web_log_id   = @webLogId
                AND p.status       = @status
                AND p.published_on < @publishedOn
              ORDER BY p.published_on DESC
-             LIMIT 1"""
+             LIMIT 1"
         addWebLogId cmd webLogId
-        [ cmd.Parameters.AddWithValue ("@status", PostStatus.toString Published)
-          cmd.Parameters.AddWithValue ("@publishedOn", publishedOn)
+        [   cmd.Parameters.AddWithValue ("@status",      PostStatus.toString Published)
+            cmd.Parameters.AddWithValue ("@publishedOn", instantParam publishedOn)
         ] |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
         let! older = backgroundTask {
             if rdr.Read () then
-                let! post = appendPostCategoryTagAndMeta (postWithoutText rdr)
+                let! post = appendPostCategoryAndTag (postWithoutText rdr)
                 return Some post
             else
                 return None
         }
         do! rdr.CloseAsync ()
-        cmd.CommandText <- $"""
+        cmd.CommandText <- $"
             {selectPost}
              WHERE p.web_log_id   = @webLogId
                AND p.status       = @status
                AND p.published_on > @publishedOn
              ORDER BY p.published_on
-             LIMIT 1"""
+             LIMIT 1"
         use! rdr = cmd.ExecuteReaderAsync ()
         let! newer = backgroundTask {
             if rdr.Read () then
-                let! post = appendPostCategoryTagAndMeta (postWithoutText rdr)
+                let! post = appendPostCategoryAndTag (postWithoutText rdr)
                 return Some post
             else
                 return None
@@ -538,24 +432,24 @@ type SQLitePostData (conn : SqliteConnection) =
         match! findFullById post.Id post.WebLogId with
         | Some oldPost ->
             use cmd = conn.CreateCommand ()
-            cmd.CommandText <- """
-                UPDATE post
-                   SET author_id    = @authorId,
-                       status       = @status,
-                       title        = @title,
-                       permalink    = @permalink,
-                       published_on = @publishedOn,
-                       updated_on   = @updatedOn,
-                       template     = @template,
-                       post_text    = @text
-                 WHERE id         = @id
-                   AND web_log_id = @webLogId"""
+            cmd.CommandText <-
+                "UPDATE post
+                    SET author_id    = @authorId,
+                        status       = @status,
+                        title        = @title,
+                        permalink    = @permalink,
+                        published_on = @publishedOn,
+                        updated_on   = @updatedOn,
+                        template     = @template,
+                        post_text    = @text,
+                        episode      = @episode,
+                        meta_items   = @metaItems
+                  WHERE id         = @id
+                    AND web_log_id = @webLogId"
             addPostParameters cmd post
             do! write cmd
             do! updatePostCategories post.Id oldPost.CategoryIds     post.CategoryIds
             do! updatePostTags       post.Id oldPost.Tags            post.Tags
-            do! updatePostEpisode    post
-            do! updatePostMeta       post.Id oldPost.Metadata        post.Metadata
             do! updatePostPermalinks post.Id oldPost.PriorPermalinks post.PriorPermalinks
             do! updatePostRevisions  post.Id oldPost.Revisions       post.Revisions
         | None -> return ()

src/MyWebLog.Data/SQLite/SQLiteTagMapData.fs

@@ -50,18 +50,14 @@ type SQLiteTagMapData (conn : SqliteConnection) =
     /// Find any tag mappings in a list of tags for the given web log
     let findMappingForTags (tags : string list) webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
+        let mapSql, mapParams = inClause "AND tag" "tag" id tags
+        cmd.CommandText <- $"
             SELECT *
-              FROM tag_map
-             WHERE web_log_id = @webLogId
-               AND tag IN ("""
-        tags
-        |> List.iteri (fun idx tag ->
-            if idx > 0 then cmd.CommandText <- $"{cmd.CommandText}, "
-            cmd.CommandText <- $"{cmd.CommandText}@tag{idx}"
-            cmd.Parameters.AddWithValue ($"@tag{idx}", tag) |> ignore)
-        cmd.CommandText <- $"{cmd.CommandText})"
+               FROM tag_map
+              WHERE web_log_id = @webLogId
+                {mapSql}"
         addWebLogId cmd webLogId
+        cmd.Parameters.AddRange mapParams
         use! rdr = cmd.ExecuteReaderAsync ()
         return toList Map.toTagMap rdr
     }
@@ -71,23 +67,23 @@ type SQLiteTagMapData (conn : SqliteConnection) =
         use cmd = conn.CreateCommand ()
         match! findById tagMap.Id tagMap.WebLogId with
         | Some _ ->
-            cmd.CommandText <- """
-                UPDATE tag_map
-                   SET tag       = @tag,
-                       url_value = @urlValue
-                 WHERE id         = @id
-                   AND web_log_id = @webLogId"""
+            cmd.CommandText <-
+                "UPDATE tag_map
+                    SET tag       = @tag,
+                        url_value = @urlValue
+                  WHERE id         = @id
+                    AND web_log_id = @webLogId"
         | None ->
-            cmd.CommandText <- """
-                INSERT INTO tag_map (
+            cmd.CommandText <-
+                "INSERT INTO tag_map (
                     id, web_log_id, tag, url_value
                 ) VALUES (
                     @id, @webLogId, @tag, @urlValue
-                )"""
+                )"
         addWebLogId cmd tagMap.WebLogId
-        [ cmd.Parameters.AddWithValue ("@id", TagMapId.toString tagMap.Id)
-          cmd.Parameters.AddWithValue ("@tag", tagMap.Tag)
-          cmd.Parameters.AddWithValue ("@urlValue", tagMap.UrlValue)
+        [   cmd.Parameters.AddWithValue ("@id",       TagMapId.toString tagMap.Id)
+            cmd.Parameters.AddWithValue ("@tag",      tagMap.Tag)
+            cmd.Parameters.AddWithValue ("@urlValue", tagMap.UrlValue)
         ] |> ignore
         do! write cmd
     }

src/MyWebLog.Data/SQLite/SQLiteThemeData.fs

@@ -17,13 +17,13 @@ type SQLiteThemeData (conn : SqliteConnection) =
         do! rdr.CloseAsync ()
         cmd.CommandText <- "SELECT name, theme_id FROM theme_template WHERE theme_id <> 'admin' ORDER BY name"
         use! rdr = cmd.ExecuteReaderAsync ()
-        let mutable templates = []
-        while rdr.Read () do
-            templates <- (ThemeId (Map.getString "theme_id" rdr), Map.toThemeTemplate false rdr) :: templates
+        let templates =
+            seq { while rdr.Read () do ThemeId (Map.getString "theme_id" rdr), Map.toThemeTemplate false rdr }
+            |> List.ofSeq
         return
             themes
             |> List.map (fun t ->
-                { t with Templates = templates |> List.filter (fun tt -> fst tt = t.Id) |> List.map snd })
+                { t with Templates = templates |> List.filter (fun (themeId, _) -> themeId = t.Id) |> List.map snd })
     }
     
     /// Does a given theme exist?
@@ -67,10 +67,10 @@ type SQLiteThemeData (conn : SqliteConnection) =
         match! findByIdWithoutText themeId with
         | Some _ ->
             use cmd = conn.CreateCommand ()
-            cmd.CommandText <- """
-                DELETE FROM theme_asset    WHERE theme_id = @id;
-                DELETE FROM theme_template WHERE theme_id = @id;
-                DELETE FROM theme          WHERE id       = @id"""
+            cmd.CommandText <-
+                "DELETE FROM theme_asset    WHERE theme_id = @id;
+                 DELETE FROM theme_template WHERE theme_id = @id;
+                 DELETE FROM theme          WHERE id       = @id"
             cmd.Parameters.AddWithValue ("@id", ThemeId.toString themeId) |> ignore
             do! write cmd
             return true
@@ -85,15 +85,15 @@ type SQLiteThemeData (conn : SqliteConnection) =
             match oldTheme with
             | Some _ -> "UPDATE theme SET name = @name, version = @version WHERE id = @id"
             | None -> "INSERT INTO theme VALUES (@id, @name, @version)"
-        [ cmd.Parameters.AddWithValue ("@id", ThemeId.toString theme.Id)
-          cmd.Parameters.AddWithValue ("@name", theme.Name)
-          cmd.Parameters.AddWithValue ("@version", theme.Version)
+        [   cmd.Parameters.AddWithValue ("@id",      ThemeId.toString theme.Id)
+            cmd.Parameters.AddWithValue ("@name",    theme.Name)
+            cmd.Parameters.AddWithValue ("@version", theme.Version)
         ] |> ignore
         do! write cmd
         
         let toDelete, toAdd =
-            diffLists (oldTheme |> Option.map (fun t -> t.Templates) |> Option.defaultValue [])
-                      theme.Templates (fun t -> t.Name)
+            Utils.diffLists (oldTheme |> Option.map (fun t -> t.Templates) |> Option.defaultValue [])
+                            theme.Templates (fun t -> t.Name)
         let toUpdate =
             theme.Templates
             |> List.filter (fun t ->
@@ -102,9 +102,9 @@ type SQLiteThemeData (conn : SqliteConnection) =
         cmd.CommandText <-
             "UPDATE theme_template SET template = @template WHERE theme_id = @themeId AND name = @name"
         cmd.Parameters.Clear ()
-        [ cmd.Parameters.AddWithValue ("@themeId", ThemeId.toString theme.Id)
-          cmd.Parameters.Add ("@name", SqliteType.Text)
-          cmd.Parameters.Add ("@template", SqliteType.Text)
+        [   cmd.Parameters.AddWithValue ("@themeId",  ThemeId.toString theme.Id)
+            cmd.Parameters.Add          ("@name",     SqliteType.Text)
+            cmd.Parameters.Add          ("@template", SqliteType.Text)
         ] |> ignore
         toUpdate
         |> List.map (fun template -> backgroundTask {
@@ -169,8 +169,8 @@ type SQLiteThemeAssetData (conn : SqliteConnection) =
         use cmd = conn.CreateCommand ()
         cmd.CommandText <- "SELECT *, ROWID FROM theme_asset WHERE theme_id = @themeId AND path = @path"
         let (ThemeAssetId (ThemeId themeId, path)) = assetId
-        [ cmd.Parameters.AddWithValue ("@themeId", themeId)
-          cmd.Parameters.AddWithValue ("@path", path)
+        [   cmd.Parameters.AddWithValue ("@themeId", themeId)
+            cmd.Parameters.AddWithValue ("@path",    path)
         ] |> ignore
         use! rdr = cmd.ExecuteReaderAsync ()
         return if rdr.Read () then Some (Map.toThemeAsset true rdr) else None
@@ -200,29 +200,29 @@ type SQLiteThemeAssetData (conn : SqliteConnection) =
         sideCmd.CommandText <-
             "SELECT COUNT(path) FROM theme_asset WHERE theme_id = @themeId AND path = @path"
         let (ThemeAssetId (ThemeId themeId, path)) = asset.Id
-        [ sideCmd.Parameters.AddWithValue ("@themeId", themeId)
-          sideCmd.Parameters.AddWithValue ("@path", path)
+        [   sideCmd.Parameters.AddWithValue ("@themeId", themeId)
+            sideCmd.Parameters.AddWithValue ("@path",    path)
         ] |> ignore
         let! exists = count sideCmd
         
         use cmd = conn.CreateCommand ()
         cmd.CommandText <-
             if exists = 1 then
-                """UPDATE theme_asset
-                      SET updated_on = @updatedOn,
-                          data       = ZEROBLOB(@dataLength)
-                    WHERE theme_id = @themeId
-                      AND path     = @path"""
+                "UPDATE theme_asset
+                    SET updated_on = @updatedOn,
+                        data       = ZEROBLOB(@dataLength)
+                  WHERE theme_id = @themeId
+                    AND path     = @path"
             else
-                """INSERT INTO theme_asset (
-                       theme_id, path, updated_on, data
-                   ) VALUES (
-                       @themeId, @path, @updatedOn, ZEROBLOB(@dataLength)
-                   )"""
-        [ cmd.Parameters.AddWithValue ("@themeId", themeId)
-          cmd.Parameters.AddWithValue ("@path", path)
-          cmd.Parameters.AddWithValue ("@updatedOn", asset.UpdatedOn)
-          cmd.Parameters.AddWithValue ("@dataLength", asset.Data.Length)
+                "INSERT INTO theme_asset (
+                    theme_id, path, updated_on, data
+                ) VALUES (
+                    @themeId, @path, @updatedOn, ZEROBLOB(@dataLength)
+                )"
+        [   cmd.Parameters.AddWithValue ("@themeId",    themeId)
+            cmd.Parameters.AddWithValue ("@path",       path)
+            cmd.Parameters.AddWithValue ("@updatedOn",  instantParam asset.UpdatedOn)
+            cmd.Parameters.AddWithValue ("@dataLength", asset.Data.Length)
         ] |> ignore
         do! write cmd
         

src/MyWebLog.Data/SQLite/SQLiteUploadData.fs

@@ -10,22 +10,22 @@ type SQLiteUploadData (conn : SqliteConnection) =
 
     /// Add parameters for uploaded file INSERT and UPDATE statements
     let addUploadParameters (cmd : SqliteCommand) (upload : Upload) =
-        [   cmd.Parameters.AddWithValue ("@id", UploadId.toString upload.Id)
-            cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString upload.WebLogId)
-            cmd.Parameters.AddWithValue ("@path", Permalink.toString upload.Path)
-            cmd.Parameters.AddWithValue ("@updatedOn", upload.UpdatedOn)
+        [   cmd.Parameters.AddWithValue ("@id",         UploadId.toString upload.Id)
+            cmd.Parameters.AddWithValue ("@webLogId",   WebLogId.toString upload.WebLogId)
+            cmd.Parameters.AddWithValue ("@path",       Permalink.toString upload.Path)
+            cmd.Parameters.AddWithValue ("@updatedOn",  instantParam upload.UpdatedOn)
             cmd.Parameters.AddWithValue ("@dataLength", upload.Data.Length)
         ] |> ignore
     
     /// Save an uploaded file
     let add upload = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            INSERT INTO upload (
+        cmd.CommandText <-
+            "INSERT INTO upload (
                 id, web_log_id, path, updated_on, data
             ) VALUES (
                 @id, @webLogId, @path, @updatedOn, ZEROBLOB(@dataLength)
-            )"""
+            )"
         addUploadParameters cmd upload
         do! write cmd
         
@@ -40,11 +40,11 @@ type SQLiteUploadData (conn : SqliteConnection) =
     /// Delete an uploaded file by its ID
     let delete uploadId webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            SELECT id, web_log_id, path, updated_on
-              FROM upload
-             WHERE id         = @id
-               AND web_log_id = @webLogId"""
+        cmd.CommandText <-
+            "SELECT id, web_log_id, path, updated_on
+               FROM upload
+              WHERE id         = @id
+                AND web_log_id = @webLogId"
         addWebLogId cmd webLogId
         cmd.Parameters.AddWithValue ("@id", UploadId.toString uploadId) |> ignore
         let! rdr = cmd.ExecuteReaderAsync ()

src/MyWebLog.Data/SQLite/SQLiteWebLogData.fs

@@ -4,81 +4,64 @@ open System.Threading.Tasks
 open Microsoft.Data.Sqlite
 open MyWebLog
 open MyWebLog.Data
+open Newtonsoft.Json
 
 // The web log podcast insert loop is not statically compilable; this is OK
 #nowarn "3511"
 
 /// SQLite myWebLog web log data implementation        
-type SQLiteWebLogData (conn : SqliteConnection) =
+type SQLiteWebLogData (conn : SqliteConnection, ser : JsonSerializer) =
     
     // SUPPORT FUNCTIONS
     
     /// Add parameters for web log INSERT or web log/RSS options UPDATE statements
     let addWebLogRssParameters (cmd : SqliteCommand) (webLog : WebLog) =
-        [   cmd.Parameters.AddWithValue ("@isFeedEnabled", webLog.Rss.IsFeedEnabled)
-            cmd.Parameters.AddWithValue ("@feedName", webLog.Rss.FeedName)
-            cmd.Parameters.AddWithValue ("@itemsInFeed", maybe webLog.Rss.ItemsInFeed)
+        [   cmd.Parameters.AddWithValue ("@isFeedEnabled",     webLog.Rss.IsFeedEnabled)
+            cmd.Parameters.AddWithValue ("@feedName",          webLog.Rss.FeedName)
+            cmd.Parameters.AddWithValue ("@itemsInFeed",       maybe webLog.Rss.ItemsInFeed)
             cmd.Parameters.AddWithValue ("@isCategoryEnabled", webLog.Rss.IsCategoryEnabled)
-            cmd.Parameters.AddWithValue ("@isTagEnabled", webLog.Rss.IsTagEnabled)
-            cmd.Parameters.AddWithValue ("@copyright", maybe webLog.Rss.Copyright)
+            cmd.Parameters.AddWithValue ("@isTagEnabled",      webLog.Rss.IsTagEnabled)
+            cmd.Parameters.AddWithValue ("@copyright",         maybe webLog.Rss.Copyright)
         ] |> ignore
     
     /// Add parameters for web log INSERT or UPDATE statements
     let addWebLogParameters (cmd : SqliteCommand) (webLog : WebLog) =
-        [   cmd.Parameters.AddWithValue ("@id", WebLogId.toString webLog.Id)
-            cmd.Parameters.AddWithValue ("@name", webLog.Name)
-            cmd.Parameters.AddWithValue ("@slug", webLog.Slug)
-            cmd.Parameters.AddWithValue ("@subtitle", maybe webLog.Subtitle)
-            cmd.Parameters.AddWithValue ("@defaultPage", webLog.DefaultPage)
+        [   cmd.Parameters.AddWithValue ("@id",           WebLogId.toString webLog.Id)
+            cmd.Parameters.AddWithValue ("@name",         webLog.Name)
+            cmd.Parameters.AddWithValue ("@slug",         webLog.Slug)
+            cmd.Parameters.AddWithValue ("@subtitle",     maybe webLog.Subtitle)
+            cmd.Parameters.AddWithValue ("@defaultPage",  webLog.DefaultPage)
             cmd.Parameters.AddWithValue ("@postsPerPage", webLog.PostsPerPage)
-            cmd.Parameters.AddWithValue ("@themeId", ThemeId.toString webLog.ThemeId)
-            cmd.Parameters.AddWithValue ("@urlBase", webLog.UrlBase)
-            cmd.Parameters.AddWithValue ("@timeZone", webLog.TimeZone)
-            cmd.Parameters.AddWithValue ("@autoHtmx", webLog.AutoHtmx)
-            cmd.Parameters.AddWithValue ("@uploads", UploadDestination.toString webLog.Uploads)
+            cmd.Parameters.AddWithValue ("@themeId",      ThemeId.toString webLog.ThemeId)
+            cmd.Parameters.AddWithValue ("@urlBase",      webLog.UrlBase)
+            cmd.Parameters.AddWithValue ("@timeZone",     webLog.TimeZone)
+            cmd.Parameters.AddWithValue ("@autoHtmx",     webLog.AutoHtmx)
+            cmd.Parameters.AddWithValue ("@uploads",      UploadDestination.toString webLog.Uploads)
         ] |> ignore
         addWebLogRssParameters cmd webLog
     
     /// Add parameters for custom feed INSERT or UPDATE statements
     let addCustomFeedParameters (cmd : SqliteCommand) webLogId (feed : CustomFeed) =
-        [   cmd.Parameters.AddWithValue ("@id", CustomFeedId.toString feed.Id)
+        [   cmd.Parameters.AddWithValue ("@id",       CustomFeedId.toString feed.Id)
             cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString webLogId)
-            cmd.Parameters.AddWithValue ("@source", CustomFeedSource.toString feed.Source)
-            cmd.Parameters.AddWithValue ("@path", Permalink.toString feed.Path)
+            cmd.Parameters.AddWithValue ("@source",   CustomFeedSource.toString feed.Source)
+            cmd.Parameters.AddWithValue ("@path",     Permalink.toString feed.Path)
+            cmd.Parameters.AddWithValue ("@podcast",  maybe (if Option.isSome feed.Podcast then
+                                                                 Some (Utils.serialize ser feed.Podcast)
+                                                             else None))
         ] |> ignore
     
-    /// Add parameters for podcast INSERT or UPDATE statements
-    let addPodcastParameters (cmd : SqliteCommand) feedId (podcast : PodcastOptions) =
-        [   cmd.Parameters.AddWithValue ("@feedId", CustomFeedId.toString feedId)
-            cmd.Parameters.AddWithValue ("@title", podcast.Title)
-            cmd.Parameters.AddWithValue ("@subtitle", maybe podcast.Subtitle)
-            cmd.Parameters.AddWithValue ("@itemsInFeed", podcast.ItemsInFeed)
-            cmd.Parameters.AddWithValue ("@summary", podcast.Summary)
-            cmd.Parameters.AddWithValue ("@displayedAuthor", podcast.DisplayedAuthor)
-            cmd.Parameters.AddWithValue ("@email", podcast.Email)
-            cmd.Parameters.AddWithValue ("@imageUrl", Permalink.toString podcast.ImageUrl)
-            cmd.Parameters.AddWithValue ("@appleCategory", podcast.AppleCategory)
-            cmd.Parameters.AddWithValue ("@appleSubcategory", maybe podcast.AppleSubcategory)
-            cmd.Parameters.AddWithValue ("@explicit", ExplicitRating.toString podcast.Explicit)
-            cmd.Parameters.AddWithValue ("@defaultMediaType", maybe podcast.DefaultMediaType)
-            cmd.Parameters.AddWithValue ("@mediaBaseUrl", maybe podcast.MediaBaseUrl)
-            cmd.Parameters.AddWithValue ("@podcastGuid", maybe podcast.PodcastGuid)
-            cmd.Parameters.AddWithValue ("@fundingUrl", maybe podcast.FundingUrl)
-            cmd.Parameters.AddWithValue ("@fundingText", maybe podcast.FundingText)
-            cmd.Parameters.AddWithValue ("@medium", maybe (podcast.Medium |> Option.map PodcastMedium.toString))
-        ] |> ignore
+    /// Shorthand to map a data reader to a custom feed
+    let toCustomFeed =
+        Map.toCustomFeed ser
     
     /// Get the current custom feeds for a web log
     let getCustomFeeds (webLog : WebLog) = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            SELECT f.*, p.*
-              FROM web_log_feed f
-                   LEFT JOIN web_log_feed_podcast p ON p.feed_id = f.id
-             WHERE f.web_log_id = @webLogId"""
+        cmd.CommandText <- "SELECT * FROM web_log_feed WHERE web_log_id = @webLogId"
         addWebLogId cmd webLog.Id
         use! rdr = cmd.ExecuteReaderAsync ()
-        return toList Map.toCustomFeed rdr
+        return toList toCustomFeed rdr
     }
     
     /// Append custom feeds to a web log
@@ -87,27 +70,10 @@ type SQLiteWebLogData (conn : SqliteConnection) =
         return { webLog with Rss = { webLog.Rss with CustomFeeds = feeds } }
     }
     
-    /// Add a podcast to a custom feed
-    let addPodcast feedId (podcast : PodcastOptions) = backgroundTask {
-        use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            INSERT INTO web_log_feed_podcast (
-                feed_id, title, subtitle, items_in_feed, summary, displayed_author, email, image_url,
-                apple_category, apple_subcategory, explicit, default_media_type, media_base_url, podcast_guid,
-                funding_url, funding_text, medium
-            ) VALUES (
-                @feedId, @title, @subtitle, @itemsInFeed, @summary, @displayedAuthor, @email, @imageUrl,
-                @appleCategory, @appleSubcategory, @explicit, @defaultMediaType, @mediaBaseUrl, @podcastGuid,
-                @fundingUrl, @fundingText, @medium
-            )"""
-        addPodcastParameters cmd feedId podcast
-        do! write cmd
-    }
-    
     /// Update the custom feeds for a web log
     let updateCustomFeeds (webLog : WebLog) = backgroundTask {
         let! feeds = getCustomFeeds webLog
-        let toDelete, toAdd = diffLists feeds webLog.Rss.CustomFeeds (fun it -> $"{CustomFeedId.toString it.Id}")
+        let toDelete, toAdd = Utils.diffLists feeds webLog.Rss.CustomFeeds (fun it -> $"{CustomFeedId.toString it.Id}")
         let toId (feed : CustomFeed) = feed.Id
         let toUpdate =
             webLog.Rss.CustomFeeds
@@ -117,9 +83,7 @@ type SQLiteWebLogData (conn : SqliteConnection) =
         cmd.Parameters.Add ("@id", SqliteType.Text) |> ignore
         toDelete
         |> List.map (fun it -> backgroundTask {
-            cmd.CommandText <- """
-                DELETE FROM web_log_feed_podcast WHERE feed_id = @id;
-                DELETE FROM web_log_feed         WHERE id      = @id"""
+            cmd.CommandText <- "DELETE FROM web_log_feed WHERE id = @id"
             cmd.Parameters["@id"].Value <- CustomFeedId.toString it.Id
             do! write cmd
         })
@@ -128,68 +92,30 @@ type SQLiteWebLogData (conn : SqliteConnection) =
         cmd.Parameters.Clear ()
         toAdd
         |> List.map (fun it -> backgroundTask {
-            cmd.CommandText <- """
-                INSERT INTO web_log_feed (
-                    id, web_log_id, source, path
+            cmd.CommandText <-
+                "INSERT INTO web_log_feed (
+                    id, web_log_id, source, path, podcast
                 ) VALUES (
-                    @id, @webLogId, @source, @path
-                )"""
+                    @id, @webLogId, @source, @path, @podcast
+                )"
             cmd.Parameters.Clear ()
             addCustomFeedParameters cmd webLog.Id it
             do! write cmd
-            match it.Podcast with
-            | Some podcast -> do! addPodcast it.Id podcast
-            | None -> ()
         })
         |> Task.WhenAll
         |> ignore
         toUpdate
         |> List.map (fun it -> backgroundTask {
-            cmd.CommandText <- """
-                UPDATE web_log_feed
-                   SET source = @source,
-                       path   = @path
-                 WHERE id         = @id
-                   AND web_log_id = @webLogId"""
+            cmd.CommandText <-
+                "UPDATE web_log_feed
+                    SET source  = @source,
+                        path    = @path,
+                        podcast = @podcast
+                  WHERE id         = @id
+                    AND web_log_id = @webLogId"
             cmd.Parameters.Clear ()
             addCustomFeedParameters cmd webLog.Id it
             do! write cmd
-            let hadPodcast = Option.isSome (feeds |> List.find (fun f -> f.Id = it.Id)).Podcast
-            match it.Podcast with
-            | Some podcast ->
-                if hadPodcast then
-                    cmd.CommandText <- """
-                        UPDATE web_log_feed_podcast
-                           SET title              = @title,
-                               subtitle           = @subtitle,
-                               items_in_feed      = @itemsInFeed,
-                               summary            = @summary,
-                               displayed_author   = @displayedAuthor,
-                               email              = @email,
-                               image_url          = @imageUrl,
-                               apple_category     = @appleCategory,
-                               apple_subcategory  = @appleSubcategory,
-                               explicit           = @explicit,
-                               default_media_type = @defaultMediaType,
-                               media_base_url     = @mediaBaseUrl,
-                               podcast_guid       = @podcastGuid,
-                               funding_url        = @fundingUrl,
-                               funding_text       = @fundingText,
-                               medium             = @medium
-                         WHERE feed_id = @feedId"""
-                    cmd.Parameters.Clear ()
-                    addPodcastParameters cmd it.Id podcast
-                    do! write cmd
-                else
-                    do! addPodcast it.Id podcast
-            | None ->
-                if hadPodcast then
-                    cmd.CommandText <- "DELETE FROM web_log_feed_podcast WHERE feed_id = @id"
-                    cmd.Parameters.Clear ()
-                    cmd.Parameters.AddWithValue ("@id", CustomFeedId.toString it.Id) |> ignore
-                    do! write cmd
-                else
-                    ()
         })
         |> Task.WhenAll
         |> ignore
@@ -200,14 +126,14 @@ type SQLiteWebLogData (conn : SqliteConnection) =
     /// Add a web log
     let add webLog = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            INSERT INTO web_log (
+        cmd.CommandText <-
+            "INSERT INTO web_log (
                 id, name, slug, subtitle, default_page, posts_per_page, theme_id, url_base, time_zone, auto_htmx,
                 uploads, is_feed_enabled, feed_name, items_in_feed, is_category_enabled, is_tag_enabled, copyright
             ) VALUES (
                 @id, @name, @slug, @subtitle, @defaultPage, @postsPerPage, @themeId, @urlBase, @timeZone, @autoHtmx,
                 @uploads, @isFeedEnabled, @feedName, @itemsInFeed, @isCategoryEnabled, @isTagEnabled, @copyright
-            )"""
+            )"
         addWebLogParameters cmd webLog
         do! write cmd
         do! updateCustomFeeds webLog
@@ -232,26 +158,22 @@ type SQLiteWebLogData (conn : SqliteConnection) =
         let subQuery table = $"(SELECT id FROM {table} WHERE web_log_id = @webLogId)"
         let postSubQuery = subQuery "post"
         let pageSubQuery = subQuery "page"
-        cmd.CommandText <- $"""
-            DELETE FROM post_comment         WHERE post_id IN {postSubQuery};
-            DELETE FROM post_revision        WHERE post_id IN {postSubQuery};
-            DELETE FROM post_permalink       WHERE post_id IN {postSubQuery};
-            DELETE FROM post_episode         WHERE post_id IN {postSubQuery};
-            DELETE FROM post_tag             WHERE post_id IN {postSubQuery};
-            DELETE FROM post_category        WHERE post_id IN {postSubQuery};
-            DELETE FROM post_meta            WHERE post_id IN {postSubQuery};
-            DELETE FROM post                 WHERE web_log_id = @webLogId;
-            DELETE FROM page_revision        WHERE page_id IN {pageSubQuery};
-            DELETE FROM page_permalink       WHERE page_id IN {pageSubQuery};
-            DELETE FROM page_meta            WHERE page_id IN {pageSubQuery};
-            DELETE FROM page                 WHERE web_log_id = @webLogId;
-            DELETE FROM category             WHERE web_log_id = @webLogId;
-            DELETE FROM tag_map              WHERE web_log_id = @webLogId;
-            DELETE FROM upload               WHERE web_log_id = @webLogId;
-            DELETE FROM web_log_user         WHERE web_log_id = @webLogId;
-            DELETE FROM web_log_feed_podcast WHERE feed_id IN {subQuery "web_log_feed"};
-            DELETE FROM web_log_feed         WHERE web_log_id = @webLogId;
-            DELETE FROM web_log              WHERE id         = @webLogId"""
+        cmd.CommandText <- $"
+            DELETE FROM post_comment   WHERE post_id IN {postSubQuery};
+            DELETE FROM post_revision  WHERE post_id IN {postSubQuery};
+            DELETE FROM post_permalink WHERE post_id IN {postSubQuery};
+            DELETE FROM post_tag       WHERE post_id IN {postSubQuery};
+            DELETE FROM post_category  WHERE post_id IN {postSubQuery};
+            DELETE FROM post           WHERE web_log_id = @webLogId;
+            DELETE FROM page_revision  WHERE page_id IN {pageSubQuery};
+            DELETE FROM page_permalink WHERE page_id IN {pageSubQuery};
+            DELETE FROM page           WHERE web_log_id = @webLogId;
+            DELETE FROM category       WHERE web_log_id = @webLogId;
+            DELETE FROM tag_map        WHERE web_log_id = @webLogId;
+            DELETE FROM upload         WHERE web_log_id = @webLogId;
+            DELETE FROM web_log_user   WHERE web_log_id = @webLogId;
+            DELETE FROM web_log_feed   WHERE web_log_id = @webLogId;
+            DELETE FROM web_log        WHERE id         = @webLogId"
         do! write cmd
     }
     
@@ -284,25 +206,25 @@ type SQLiteWebLogData (conn : SqliteConnection) =
     /// Update settings for a web log
     let updateSettings webLog = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            UPDATE web_log
-               SET name                = @name,
-                   slug                = @slug,
-                   subtitle            = @subtitle,
-                   default_page        = @defaultPage,
-                   posts_per_page      = @postsPerPage,
-                   theme_id            = @themeId,
-                   url_base            = @urlBase,
-                   time_zone           = @timeZone,
-                   auto_htmx           = @autoHtmx,
-                   uploads             = @uploads,
-                   is_feed_enabled     = @isFeedEnabled,
-                   feed_name           = @feedName,
-                   items_in_feed       = @itemsInFeed,
-                   is_category_enabled = @isCategoryEnabled,
-                   is_tag_enabled      = @isTagEnabled,
-                   copyright           = @copyright
-             WHERE id = @id"""
+        cmd.CommandText <-
+            "UPDATE web_log
+                SET name                = @name,
+                    slug                = @slug,
+                    subtitle            = @subtitle,
+                    default_page        = @defaultPage,
+                    posts_per_page      = @postsPerPage,
+                    theme_id            = @themeId,
+                    url_base            = @urlBase,
+                    time_zone           = @timeZone,
+                    auto_htmx           = @autoHtmx,
+                    uploads             = @uploads,
+                    is_feed_enabled     = @isFeedEnabled,
+                    feed_name           = @feedName,
+                    items_in_feed       = @itemsInFeed,
+                    is_category_enabled = @isCategoryEnabled,
+                    is_tag_enabled      = @isTagEnabled,
+                    copyright           = @copyright
+              WHERE id = @id"
         addWebLogParameters cmd webLog
         do! write cmd
     }
@@ -310,15 +232,15 @@ type SQLiteWebLogData (conn : SqliteConnection) =
     /// Update RSS options for a web log
     let updateRssOptions webLog = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            UPDATE web_log
-               SET is_feed_enabled     = @isFeedEnabled,
-                   feed_name           = @feedName,
-                   items_in_feed       = @itemsInFeed,
-                   is_category_enabled = @isCategoryEnabled,
-                   is_tag_enabled      = @isTagEnabled,
-                   copyright           = @copyright
-             WHERE id = @id"""
+        cmd.CommandText <-
+            "UPDATE web_log
+                SET is_feed_enabled     = @isFeedEnabled,
+                    feed_name           = @feedName,
+                    items_in_feed       = @itemsInFeed,
+                    is_category_enabled = @isCategoryEnabled,
+                    is_tag_enabled      = @isTagEnabled,
+                    copyright           = @copyright
+              WHERE id = @id"
         addWebLogRssParameters cmd webLog
         cmd.Parameters.AddWithValue ("@id", WebLogId.toString webLog.Id) |> ignore
         do! write cmd

src/MyWebLog.Data/SQLite/SQLiteWebLogUserData.fs

@@ -1,6 +1,5 @@
 namespace MyWebLog.Data.SQLite
 
-open System
 open Microsoft.Data.Sqlite
 open MyWebLog
 open MyWebLog.Data
@@ -12,18 +11,17 @@ type SQLiteWebLogUserData (conn : SqliteConnection) =
 
     /// Add parameters for web log user INSERT or UPDATE statements
     let addWebLogUserParameters (cmd : SqliteCommand) (user : WebLogUser) =
-        [   cmd.Parameters.AddWithValue ("@id", WebLogUserId.toString user.Id)
-            cmd.Parameters.AddWithValue ("@webLogId", WebLogId.toString user.WebLogId)
-            cmd.Parameters.AddWithValue ("@email", user.Email)
-            cmd.Parameters.AddWithValue ("@firstName", user.FirstName)
-            cmd.Parameters.AddWithValue ("@lastName", user.LastName)
+        [   cmd.Parameters.AddWithValue ("@id",            WebLogUserId.toString user.Id)
+            cmd.Parameters.AddWithValue ("@webLogId",      WebLogId.toString user.WebLogId)
+            cmd.Parameters.AddWithValue ("@email",         user.Email)
+            cmd.Parameters.AddWithValue ("@firstName",     user.FirstName)
+            cmd.Parameters.AddWithValue ("@lastName",      user.LastName)
             cmd.Parameters.AddWithValue ("@preferredName", user.PreferredName)
-            cmd.Parameters.AddWithValue ("@passwordHash", user.PasswordHash)
-            cmd.Parameters.AddWithValue ("@salt", user.Salt)
-            cmd.Parameters.AddWithValue ("@url", maybe user.Url)
-            cmd.Parameters.AddWithValue ("@accessLevel", AccessLevel.toString user.AccessLevel)
-            cmd.Parameters.AddWithValue ("@createdOn", user.CreatedOn)
-            cmd.Parameters.AddWithValue ("@lastSeenOn", maybe user.LastSeenOn)
+            cmd.Parameters.AddWithValue ("@passwordHash",  user.PasswordHash)
+            cmd.Parameters.AddWithValue ("@url",           maybe user.Url)
+            cmd.Parameters.AddWithValue ("@accessLevel",   AccessLevel.toString user.AccessLevel)
+            cmd.Parameters.AddWithValue ("@createdOn",     instantParam user.CreatedOn)
+            cmd.Parameters.AddWithValue ("@lastSeenOn",    maybeInstant user.LastSeenOn)
         ] |> ignore
     
     // IMPLEMENTATION FUNCTIONS
@@ -31,14 +29,14 @@ type SQLiteWebLogUserData (conn : SqliteConnection) =
     /// Add a user
     let add user = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            INSERT INTO web_log_user (
-                id, web_log_id, email, first_name, last_name, preferred_name, password_hash, salt, url, access_level,
+        cmd.CommandText <-
+            "INSERT INTO web_log_user (
+                id, web_log_id, email, first_name, last_name, preferred_name, password_hash, url, access_level,
                 created_on, last_seen_on
             ) VALUES (
-                @id, @webLogId, @email, @firstName, @lastName, @preferredName, @passwordHash, @salt, @url, @accessLevel,
+                @id, @webLogId, @email, @firstName, @lastName, @preferredName, @passwordHash, @url, @accessLevel,
                 @createdOn, @lastSeenOn
-            )"""
+            )"
         addWebLogUserParameters cmd user
         do! write cmd
     }
@@ -93,14 +91,10 @@ type SQLiteWebLogUserData (conn : SqliteConnection) =
     /// Find the names of users by their IDs for the given web log
     let findNames webLogId userIds = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- "SELECT * FROM web_log_user WHERE web_log_id = @webLogId AND id IN ("
-        userIds
-        |> List.iteri (fun idx userId ->
-            if idx > 0 then cmd.CommandText <- $"{cmd.CommandText}, "
-            cmd.CommandText <- $"{cmd.CommandText}@id{idx}"
-            cmd.Parameters.AddWithValue ($"@id{idx}", WebLogUserId.toString userId) |> ignore)
-        cmd.CommandText <- $"{cmd.CommandText})"
+        let nameSql, nameParams = inClause "AND id" "id" WebLogUserId.toString userIds 
+        cmd.CommandText <- $"SELECT * FROM web_log_user WHERE web_log_id = @webLogId {nameSql}"
         addWebLogId cmd webLogId
+        cmd.Parameters.AddRange nameParams
         use! rdr = cmd.ExecuteReaderAsync ()
         return
             toList Map.toWebLogUser rdr
@@ -116,14 +110,14 @@ type SQLiteWebLogUserData (conn : SqliteConnection) =
     /// Set a user's last seen date/time to now
     let setLastSeen userId webLogId = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            UPDATE web_log_user
-               SET last_seen_on = @lastSeenOn
-             WHERE id         = @id
-               AND web_log_id = @webLogId"""
+        cmd.CommandText <-
+            "UPDATE web_log_user
+                SET last_seen_on = @lastSeenOn
+              WHERE id         = @id
+                AND web_log_id = @webLogId"
         addWebLogId cmd webLogId
-        [ cmd.Parameters.AddWithValue ("@id", WebLogUserId.toString userId)
-          cmd.Parameters.AddWithValue ("@lastSeenOn", DateTime.UtcNow)
+        [   cmd.Parameters.AddWithValue ("@id",         WebLogUserId.toString userId)
+            cmd.Parameters.AddWithValue ("@lastSeenOn", instantParam (Noda.now ()))
         ] |> ignore
         let! _ = cmd.ExecuteNonQueryAsync ()
         ()
@@ -132,20 +126,19 @@ type SQLiteWebLogUserData (conn : SqliteConnection) =
     /// Update a user
     let update user = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- """
-            UPDATE web_log_user
-               SET email          = @email,
-                   first_name     = @firstName,
-                   last_name      = @lastName,
-                   preferred_name = @preferredName,
-                   password_hash  = @passwordHash,
-                   salt           = @salt,
-                   url            = @url,
-                   access_level   = @accessLevel,
-                   created_on     = @createdOn,
-                   last_seen_on   = @lastSeenOn
-             WHERE id         = @id
-               AND web_log_id = @webLogId"""
+        cmd.CommandText <-
+            "UPDATE web_log_user
+                SET email          = @email,
+                    first_name     = @firstName,
+                    last_name      = @lastName,
+                    preferred_name = @preferredName,
+                    password_hash  = @passwordHash,
+                    url            = @url,
+                    access_level   = @accessLevel,
+                    created_on     = @createdOn,
+                    last_seen_on   = @lastSeenOn
+              WHERE id         = @id
+                AND web_log_id = @webLogId"
         addWebLogUserParameters cmd user
         do! write cmd
     }

src/MyWebLog.Data/SQLiteData.fs

@@ -2,18 +2,543 @@ namespace MyWebLog.Data
 
 open Microsoft.Data.Sqlite
 open Microsoft.Extensions.Logging
+open MyWebLog
 open MyWebLog.Data.SQLite
+open Newtonsoft.Json
+open NodaTime
 
 /// SQLite myWebLog data implementation        
-type SQLiteData (conn : SqliteConnection, log : ILogger<SQLiteData>) =
+type SQLiteData (conn : SqliteConnection, log : ILogger<SQLiteData>, ser : JsonSerializer) =
+    
+    let ensureTables () = backgroundTask {
 
-    /// Determine if the given table exists
-    let tableExists (table : string) = backgroundTask {
         use cmd = conn.CreateCommand ()
-        cmd.CommandText <- "SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name = @table"
-        cmd.Parameters.AddWithValue ("@table", table) |> ignore
-        let! count = count cmd
-        return count = 1
+        
+        let! tables = backgroundTask {
+            cmd.CommandText <- "SELECT name FROM sqlite_master WHERE type = 'table'"
+            let! rdr = cmd.ExecuteReaderAsync ()
+            let mutable tableList = []
+            while rdr.Read() do
+                tableList <- Map.getString "name" rdr :: tableList
+            do! rdr.CloseAsync ()
+            return tableList
+        }
+        let needsTable table =
+            not (List.contains table tables)
+        seq {
+            // Theme tables
+            if needsTable "theme" then
+                "CREATE TABLE theme (
+                    id       TEXT PRIMARY KEY,
+                    name     TEXT NOT NULL,
+                    version  TEXT NOT NULL)"
+            if needsTable "theme_template" then
+                "CREATE TABLE theme_template (
+                    theme_id  TEXT NOT NULL REFERENCES theme (id),
+                    name      TEXT NOT NULL,
+                    template  TEXT NOT NULL,
+                    PRIMARY KEY (theme_id, name))"
+            if needsTable "theme_asset" then
+                "CREATE TABLE theme_asset (
+                    theme_id    TEXT NOT NULL REFERENCES theme (id),
+                    path        TEXT NOT NULL,
+                    updated_on  TEXT NOT NULL,
+                    data        BLOB NOT NULL,
+                    PRIMARY KEY (theme_id, path))"
+            
+            // Web log tables
+            if needsTable "web_log" then
+                "CREATE TABLE web_log (
+                    id                   TEXT PRIMARY KEY,
+                    name                 TEXT NOT NULL,
+                    slug                 TEXT NOT NULL,
+                    subtitle             TEXT,
+                    default_page         TEXT NOT NULL,
+                    posts_per_page       INTEGER NOT NULL,
+                    theme_id             TEXT NOT NULL REFERENCES theme (id),
+                    url_base             TEXT NOT NULL,
+                    time_zone            TEXT NOT NULL,
+                    auto_htmx            INTEGER NOT NULL DEFAULT 0,
+                    uploads              TEXT NOT NULL,
+                    is_feed_enabled      INTEGER NOT NULL DEFAULT 0,
+                    feed_name            TEXT NOT NULL,
+                    items_in_feed        INTEGER,
+                    is_category_enabled  INTEGER NOT NULL DEFAULT 0,
+                    is_tag_enabled       INTEGER NOT NULL DEFAULT 0,
+                    copyright            TEXT);
+                CREATE INDEX web_log_theme_idx ON web_log (theme_id)"
+            if needsTable "web_log_feed" then
+                "CREATE TABLE web_log_feed (
+                    id          TEXT PRIMARY KEY,
+                    web_log_id  TEXT NOT NULL REFERENCES web_log (id),
+                    source      TEXT NOT NULL,
+                    path        TEXT NOT NULL,
+                    podcast     TEXT);
+                CREATE INDEX web_log_feed_web_log_idx ON web_log_feed (web_log_id)"
+            
+            // Category table
+            if needsTable "category" then
+                "CREATE TABLE category (
+                    id           TEXT PRIMARY KEY,
+                    web_log_id   TEXT NOT NULL REFERENCES web_log (id),
+                    name         TEXT NOT NULL,
+                    slug         TEXT NOT NULL,
+                    description  TEXT,
+                    parent_id    TEXT);
+                CREATE INDEX category_web_log_idx ON category (web_log_id)"
+            
+            // Web log user table
+            if needsTable "web_log_user" then
+                "CREATE TABLE web_log_user (
+                    id              TEXT PRIMARY KEY,
+                    web_log_id      TEXT NOT NULL REFERENCES web_log (id),
+                    email           TEXT NOT NULL,
+                    first_name      TEXT NOT NULL,
+                    last_name       TEXT NOT NULL,
+                    preferred_name  TEXT NOT NULL,
+                    password_hash   TEXT NOT NULL,
+                    url             TEXT,
+                    access_level    TEXT NOT NULL,
+                    created_on      TEXT NOT NULL,
+                    last_seen_on    TEXT);
+                CREATE INDEX web_log_user_web_log_idx ON web_log_user (web_log_id);
+                CREATE INDEX web_log_user_email_idx   ON web_log_user (web_log_id, email)"
+            
+            // Page tables
+            if needsTable "page" then
+                "CREATE TABLE page (
+                    id               TEXT PRIMARY KEY,
+                    web_log_id       TEXT NOT NULL REFERENCES web_log (id),
+                    author_id        TEXT NOT NULL REFERENCES web_log_user (id),
+                    title            TEXT NOT NULL,
+                    permalink        TEXT NOT NULL,
+                    published_on     TEXT NOT NULL,
+                    updated_on       TEXT NOT NULL,
+                    is_in_page_list  INTEGER NOT NULL DEFAULT 0,
+                    template         TEXT,
+                    page_text        TEXT NOT NULL,
+                    meta_items       TEXT);
+                CREATE INDEX page_web_log_idx   ON page (web_log_id);
+                CREATE INDEX page_author_idx    ON page (author_id);
+                CREATE INDEX page_permalink_idx ON page (web_log_id, permalink)"
+            if needsTable "page_permalink" then
+                "CREATE TABLE page_permalink (
+                    page_id    TEXT NOT NULL REFERENCES page (id),
+                    permalink  TEXT NOT NULL,
+                    PRIMARY KEY (page_id, permalink))"
+            if needsTable "page_revision" then
+                "CREATE TABLE page_revision (
+                    page_id        TEXT NOT NULL REFERENCES page (id),
+                    as_of          TEXT NOT NULL,
+                    revision_text  TEXT NOT NULL,
+                    PRIMARY KEY (page_id, as_of))"
+            
+            // Post tables
+            if needsTable "post" then
+                "CREATE TABLE post (
+                    id            TEXT PRIMARY KEY,
+                    web_log_id    TEXT NOT NULL REFERENCES web_log (id),
+                    author_id     TEXT NOT NULL REFERENCES web_log_user (id),
+                    status        TEXT NOT NULL,
+                    title         TEXT NOT NULL,
+                    permalink     TEXT NOT NULL,
+                    published_on  TEXT,
+                    updated_on    TEXT NOT NULL,
+                    template      TEXT,
+                    post_text     TEXT NOT NULL,
+                    meta_items    TEXT,
+                    episode       TEXT);
+                CREATE INDEX post_web_log_idx   ON post (web_log_id);
+                CREATE INDEX post_author_idx    ON post (author_id);
+                CREATE INDEX post_status_idx    ON post (web_log_id, status, updated_on);
+                CREATE INDEX post_permalink_idx ON post (web_log_id, permalink)"
+            if needsTable "post_category" then
+                "CREATE TABLE post_category (
+                    post_id      TEXT NOT NULL REFERENCES post (id),
+                    category_id  TEXT NOT NULL REFERENCES category (id),
+                    PRIMARY KEY (post_id, category_id));
+                CREATE INDEX post_category_category_idx ON post_category (category_id)"
+            if needsTable "post_tag" then
+                "CREATE TABLE post_tag (
+                    post_id  TEXT NOT NULL REFERENCES post (id),
+                    tag      TEXT NOT NULL,
+                    PRIMARY KEY (post_id, tag))"
+            if needsTable "post_permalink" then
+                "CREATE TABLE post_permalink (
+                    post_id    TEXT NOT NULL REFERENCES post (id),
+                    permalink  TEXT NOT NULL,
+                    PRIMARY KEY (post_id, permalink))"
+            if needsTable "post_revision" then
+                "CREATE TABLE post_revision (
+                    post_id        TEXT NOT NULL REFERENCES post (id),
+                    as_of          TEXT NOT NULL,
+                    revision_text  TEXT NOT NULL,
+                    PRIMARY KEY (post_id, as_of))"
+            if needsTable "post_comment" then
+                "CREATE TABLE post_comment (
+                    id              TEXT PRIMARY KEY,
+                    post_id         TEXT NOT NULL REFERENCES post(id),
+                    in_reply_to_id  TEXT,
+                    name            TEXT NOT NULL,
+                    email           TEXT NOT NULL,
+                    url             TEXT,
+                    status          TEXT NOT NULL,
+                    posted_on       TEXT NOT NULL,
+                    comment_text    TEXT NOT NULL);
+                CREATE INDEX post_comment_post_idx ON post_comment (post_id)"
+            
+            // Tag map table
+            if needsTable "tag_map" then
+                "CREATE TABLE tag_map (
+                    id          TEXT PRIMARY KEY,
+                    web_log_id  TEXT NOT NULL REFERENCES web_log (id),
+                    tag         TEXT NOT NULL,
+                    url_value   TEXT NOT NULL);
+                CREATE INDEX tag_map_web_log_idx ON tag_map (web_log_id)"
+            
+            // Uploaded file table
+            if needsTable "upload" then
+                "CREATE TABLE upload (
+                    id          TEXT PRIMARY KEY,
+                    web_log_id  TEXT NOT NULL REFERENCES web_log (id),
+                    path        TEXT NOT NULL,
+                    updated_on  TEXT NOT NULL,
+                    data        BLOB NOT NULL);
+                CREATE INDEX upload_web_log_idx ON upload (web_log_id);
+                CREATE INDEX upload_path_idx    ON upload (web_log_id, path)"
+            
+            // Database version table
+            if needsTable "db_version" then
+                "CREATE TABLE db_version (id TEXT PRIMARY KEY);
+                 INSERT INTO db_version VALUES ('v2-rc1')"
+        }
+        |> Seq.map (fun sql ->
+            log.LogInformation $"Creating {(sql.Split ' ')[2]} table..."
+            cmd.CommandText <- sql
+            write cmd |> Async.AwaitTask |> Async.RunSynchronously)
+        |> List.ofSeq
+        |> ignore
+    }
+    
+    /// Set the database version to the specified version
+    let setDbVersion version = backgroundTask {
+        use cmd = conn.CreateCommand ()
+        cmd.CommandText <- $"DELETE FROM db_version; INSERT INTO db_version VALUES ('%s{version}')"
+        do! write cmd
+    }
+    
+    /// Implement the changes between v2-rc1 and v2-rc2
+    let migrateV2Rc1ToV2Rc2 () = backgroundTask {
+        let logStep = Utils.logMigrationStep log "v2-rc1 to v2-rc2"
+        // Move meta items, podcast settings, and episode details to JSON-encoded text fields
+        use cmd = conn.CreateCommand ()
+        logStep "Adding new columns"
+        cmd.CommandText <-
+            "ALTER TABLE web_log_feed ADD COLUMN podcast    TEXT;
+             ALTER TABLE page         ADD COLUMN meta_items TEXT;
+             ALTER TABLE post         ADD COLUMN meta_items TEXT;
+             ALTER TABLE post         ADD COLUMN episode    TEXT"
+        do! write cmd
+        logStep "Migrating meta items"
+        let migrateMeta entity = backgroundTask {
+            cmd.CommandText <- $"SELECT * FROM %s{entity}_meta"
+            use! metaRdr = cmd.ExecuteReaderAsync ()
+            let allMetas =
+                seq {
+                    while metaRdr.Read () do
+                        Map.getString $"{entity}_id" metaRdr,
+                        { Name = Map.getString "name" metaRdr; Value = Map.getString "value" metaRdr }
+                } |> List.ofSeq
+            metaRdr.Close ()
+            let metas =
+                allMetas
+                |> List.map fst
+                |> List.distinct
+                |> List.map (fun it -> it, allMetas |> List.filter (fun meta -> fst meta = it))
+            metas
+            |> List.iter (fun (entityId, items) ->
+                cmd.CommandText <-
+                    "UPDATE post
+                        SET meta_items = @metaItems
+                      WHERE id = @postId"
+                [   cmd.Parameters.AddWithValue ("@metaItems", Utils.serialize ser items)
+                    cmd.Parameters.AddWithValue ("@id",        entityId) ] |> ignore
+                let _ = cmd.ExecuteNonQuery ()
+                cmd.Parameters.Clear ())
+        }
+        do! migrateMeta "page"
+        do! migrateMeta "post"
+        logStep "Migrating podcasts and episodes"
+        cmd.CommandText <- "SELECT * FROM web_log_feed_podcast"
+        use! podcastRdr = cmd.ExecuteReaderAsync ()
+        let podcasts =
+            seq {
+                while podcastRdr.Read () do
+                    CustomFeedId (Map.getString "feed_id" podcastRdr),
+                    {   Title             = Map.getString "title"              podcastRdr
+                        Subtitle          = Map.tryString "subtitle"           podcastRdr
+                        ItemsInFeed       = Map.getInt    "items_in_feed"      podcastRdr
+                        Summary           = Map.getString "summary"            podcastRdr
+                        DisplayedAuthor   = Map.getString "displayed_author"   podcastRdr
+                        Email             = Map.getString "email"              podcastRdr
+                        ImageUrl          = Map.getString "image_url"          podcastRdr |> Permalink
+                        AppleCategory     = Map.getString "apple_category"     podcastRdr
+                        AppleSubcategory  = Map.tryString "apple_subcategory"  podcastRdr
+                        Explicit          = Map.getString "explicit"           podcastRdr |> ExplicitRating.parse
+                        DefaultMediaType  = Map.tryString "default_media_type" podcastRdr
+                        MediaBaseUrl      = Map.tryString "media_base_url"     podcastRdr
+                        PodcastGuid       = Map.tryGuid   "podcast_guid"       podcastRdr
+                        FundingUrl        = Map.tryString "funding_url"        podcastRdr
+                        FundingText       = Map.tryString "funding_text"       podcastRdr
+                        Medium            = Map.tryString "medium"             podcastRdr
+                                            |> Option.map PodcastMedium.parse
+                    }
+            } |> List.ofSeq
+        podcastRdr.Close ()
+        podcasts
+        |> List.iter (fun (feedId, podcast) ->
+            cmd.CommandText <- "UPDATE web_log_feed SET podcast = @podcast WHERE id = @id"
+            [   cmd.Parameters.AddWithValue ("@podcast", Utils.serialize ser podcast)
+                cmd.Parameters.AddWithValue ("@id", CustomFeedId.toString feedId) ] |> ignore
+            let _ = cmd.ExecuteNonQuery ()
+            cmd.Parameters.Clear ())
+        cmd.CommandText <- "SELECT * FROM post_episode"
+        use! epRdr = cmd.ExecuteReaderAsync ()
+        let episodes =
+            seq {
+                while epRdr.Read () do
+                    PostId (Map.getString "post_id" epRdr),
+                    {   Media              = Map.getString   "media"               epRdr
+                        Length             = Map.getLong     "length"              epRdr
+                        Duration           = Map.tryTimeSpan "duration"            epRdr
+                                             |> Option.map Duration.FromTimeSpan
+                        MediaType          = Map.tryString   "media_type"          epRdr
+                        ImageUrl           = Map.tryString   "image_url"           epRdr
+                        Subtitle           = Map.tryString   "subtitle"            epRdr
+                        Explicit           = Map.tryString   "explicit"            epRdr
+                                             |> Option.map ExplicitRating.parse
+                        ChapterFile        = Map.tryString   "chapter_file"        epRdr
+                        ChapterType        = Map.tryString   "chapter_type"        epRdr
+                        TranscriptUrl      = Map.tryString   "transcript_url"      epRdr
+                        TranscriptType     = Map.tryString   "transcript_type"     epRdr
+                        TranscriptLang     = Map.tryString   "transcript_lang"     epRdr
+                        TranscriptCaptions = Map.tryBoolean  "transcript_captions" epRdr
+                        SeasonNumber       = Map.tryInt      "season_number"       epRdr
+                        SeasonDescription  = Map.tryString   "season_description"  epRdr
+                        EpisodeNumber      = Map.tryString   "episode_number"      epRdr
+                                             |> Option.map System.Double.Parse
+                        EpisodeDescription = Map.tryString   "episode_description" epRdr
+                    }
+            } |> List.ofSeq
+        epRdr.Close ()
+        episodes
+        |> List.iter (fun (postId, episode) ->
+            cmd.CommandText <- "UPDATE post SET episode = @episode WHERE id = @id"
+            [   cmd.Parameters.AddWithValue ("@episode", Utils.serialize ser episode)
+                cmd.Parameters.AddWithValue ("@id",      PostId.toString postId) ] |> ignore
+            let _ = cmd.ExecuteNonQuery ()
+            cmd.Parameters.Clear ())
+        
+        logStep "Migrating dates/times"
+        let inst (dt : System.DateTime) =
+            System.DateTime (dt.Ticks, System.DateTimeKind.Utc)
+            |> (Instant.FromDateTimeUtc >> Noda.toSecondsPrecision)
+        // page.updated_on, page.published_on
+        cmd.CommandText <- "SELECT id, updated_on, published_on FROM page"
+        use! pageRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while pageRdr.Read () do
+                    Map.getString "id" pageRdr,
+                    inst (Map.getDateTime "updated_on"   pageRdr),
+                    inst (Map.getDateTime "published_on" pageRdr)
+            } |> List.ofSeq
+        pageRdr.Close ()
+        cmd.CommandText <- "UPDATE page SET updated_on = @updatedOn, published_on = @publishedOn WHERE id = @id"
+        [   cmd.Parameters.Add ("@id",          SqliteType.Text)
+            cmd.Parameters.Add ("@updatedOn",   SqliteType.Text)
+            cmd.Parameters.Add ("@publishedOn", SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (pageId, updatedOn, publishedOn) ->
+            cmd.Parameters["@id"         ].Value <- pageId
+            cmd.Parameters["@updatedOn"  ].Value <- instantParam updatedOn
+            cmd.Parameters["@publishedOn"].Value <- instantParam publishedOn
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        // page_revision.as_of
+        cmd.CommandText <- "SELECT * FROM page_revision"
+        use! pageRevRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while pageRevRdr.Read () do
+                    let asOf = Map.getDateTime "as_of" pageRevRdr
+                    Map.getString "page_id" pageRevRdr, asOf, inst asOf, Map.getString "revision_text" pageRevRdr
+            } |> List.ofSeq
+        pageRevRdr.Close ()
+        cmd.CommandText <-
+            "DELETE FROM page_revision WHERE page_id = @pageId AND as_of = @oldAsOf;
+             INSERT INTO page_revision (page_id, as_of, revision_text) VALUES (@pageId, @asOf, @text)"
+        [   cmd.Parameters.Add ("@pageId",  SqliteType.Text)
+            cmd.Parameters.Add ("@oldAsOf", SqliteType.Text)
+            cmd.Parameters.Add ("@asOf",    SqliteType.Text)
+            cmd.Parameters.Add ("@text",    SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (pageId, oldAsOf, asOf, text) ->
+            cmd.Parameters["@pageId" ].Value <- pageId
+            cmd.Parameters["@oldAsOf"].Value <- oldAsOf
+            cmd.Parameters["@asOf"   ].Value <- instantParam asOf
+            cmd.Parameters["@text"   ].Value <- text
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        // post.updated_on, post.published_on (opt)
+        cmd.CommandText <- "SELECT id, updated_on, published_on FROM post"
+        use! postRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while postRdr.Read () do
+                    Map.getString "id" postRdr,
+                    inst (Map.getDateTime "updated_on"   postRdr),
+                    (Map.tryDateTime "published_on" postRdr |> Option.map inst)
+            } |> List.ofSeq
+        postRdr.Close ()
+        cmd.CommandText <- "UPDATE post SET updated_on = @updatedOn, published_on = @publishedOn WHERE id = @id"
+        [   cmd.Parameters.Add ("@id",          SqliteType.Text)
+            cmd.Parameters.Add ("@updatedOn",   SqliteType.Text)
+            cmd.Parameters.Add ("@publishedOn", SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (postId, updatedOn, publishedOn) ->
+            cmd.Parameters["@id"         ].Value <- postId
+            cmd.Parameters["@updatedOn"  ].Value <- instantParam updatedOn
+            cmd.Parameters["@publishedOn"].Value <- maybeInstant publishedOn
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        // post_revision.as_of
+        cmd.CommandText <- "SELECT * FROM post_revision"
+        use! postRevRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while postRevRdr.Read () do
+                    let asOf = Map.getDateTime "as_of" postRevRdr
+                    Map.getString "post_id" postRevRdr, asOf, inst asOf, Map.getString "revision_text" postRevRdr
+            } |> List.ofSeq
+        postRevRdr.Close ()
+        cmd.CommandText <-
+            "DELETE FROM post_revision WHERE post_id = @postId AND as_of = @oldAsOf;
+             INSERT INTO post_revision (post_id, as_of, revision_text) VALUES (@postId, @asOf, @text)"
+        [   cmd.Parameters.Add ("@postId",  SqliteType.Text)
+            cmd.Parameters.Add ("@oldAsOf", SqliteType.Text)
+            cmd.Parameters.Add ("@asOf",    SqliteType.Text)
+            cmd.Parameters.Add ("@text",    SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (postId, oldAsOf, asOf, text) ->
+            cmd.Parameters["@postId" ].Value <- postId
+            cmd.Parameters["@oldAsOf"].Value <- oldAsOf
+            cmd.Parameters["@asOf"   ].Value <- instantParam asOf
+            cmd.Parameters["@text"   ].Value <- text
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        // theme_asset.updated_on
+        cmd.CommandText <- "SELECT theme_id, path, updated_on FROM theme_asset"
+        use! assetRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while assetRdr.Read () do
+                    Map.getString "theme_id" assetRdr, Map.getString "path" assetRdr,
+                    inst (Map.getDateTime "updated_on" assetRdr)
+            } |> List.ofSeq
+        assetRdr.Close ()
+        cmd.CommandText <- "UPDATE theme_asset SET updated_on = @updatedOn WHERE theme_id = @themeId AND path = @path"
+        [   cmd.Parameters.Add ("@updatedOn", SqliteType.Text)
+            cmd.Parameters.Add ("@themeId",   SqliteType.Text)
+            cmd.Parameters.Add ("@path",      SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (themeId, path, updatedOn) ->
+            cmd.Parameters["@themeId"  ].Value <- themeId
+            cmd.Parameters["@path"     ].Value <- path
+            cmd.Parameters["@updatedOn"].Value <- instantParam updatedOn
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        // upload.updated_on
+        cmd.CommandText <- "SELECT id, updated_on FROM upload"
+        use! upRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while upRdr.Read () do
+                    Map.getString "id" upRdr, inst (Map.getDateTime "updated_on" upRdr)
+            } |> List.ofSeq
+        upRdr.Close ()
+        cmd.CommandText <- "UPDATE upload SET updated_on = @updatedOn WHERE id = @id"
+        [   cmd.Parameters.Add ("@updatedOn", SqliteType.Text)
+            cmd.Parameters.Add ("@id",        SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (upId, updatedOn) ->
+            cmd.Parameters["@id"       ].Value <- upId
+            cmd.Parameters["@updatedOn"].Value <- instantParam updatedOn
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        // web_log_user.created_on, web_log_user.last_seen_on (opt)
+        cmd.CommandText <- "SELECT id, created_on, last_seen_on FROM web_log_user"
+        use! userRdr = cmd.ExecuteReaderAsync ()
+        let toUpdate =
+            seq {
+                while userRdr.Read () do
+                    Map.getString "id" userRdr,
+                    inst (Map.getDateTime "created_on" userRdr),
+                    (Map.tryDateTime "last_seen_on" userRdr |> Option.map inst)
+            } |> List.ofSeq
+        userRdr.Close ()
+        cmd.CommandText <- "UPDATE web_log_user SET created_on = @createdOn, last_seen_on = @lastSeenOn WHERE id = @id"
+        [   cmd.Parameters.Add ("@id",         SqliteType.Text)
+            cmd.Parameters.Add ("@createdOn",  SqliteType.Text)
+            cmd.Parameters.Add ("@lastSeenOn", SqliteType.Text)
+        ] |> ignore
+        toUpdate
+        |> List.iter (fun (userId, createdOn, lastSeenOn) ->
+            cmd.Parameters["@id"        ].Value <- userId
+            cmd.Parameters["@createdOn" ].Value <- instantParam createdOn
+            cmd.Parameters["@lastSeenOn"].Value <- maybeInstant lastSeenOn
+            let _ = cmd.ExecuteNonQuery ()
+            ())
+        cmd.Parameters.Clear ()
+        
+        conn.Close ()
+        conn.Open ()
+        
+        logStep "Dropping old tables and columns"
+        cmd.CommandText <-
+            "ALTER TABLE web_log_user DROP COLUMN salt;
+             DROP  TABLE post_episode;
+             DROP  TABLE post_meta;
+             DROP  TABLE page_meta;
+             DROP  TABLE web_log_feed_podcast"
+        do! write cmd
+        
+        logStep "Setting database version to v2-rc2"
+        do! setDbVersion "v2-rc2"
+    }
+    
+    /// Migrate data among versions (up only)
+    let migrate version = backgroundTask {
+        
+        match version with
+        | Some v when v = "v2-rc2" -> ()
+        | Some v when v = "v2-rc1" -> do! migrateV2Rc1ToV2Rc2 ()
+        | Some _
+        | None ->
+            log.LogWarning $"Unknown database version; assuming {Utils.currentDbVersion}"
+            do! setDbVersion Utils.currentDbVersion
     }
 
     /// The connection for this instance
@@ -31,355 +556,26 @@ type SQLiteData (conn : SqliteConnection, log : ILogger<SQLiteData>) =
     interface IData with
     
         member _.Category   = SQLiteCategoryData   conn
-        member _.Page       = SQLitePageData       conn
-        member _.Post       = SQLitePostData       conn
+        member _.Page       = SQLitePageData       (conn, ser)
+        member _.Post       = SQLitePostData       (conn, ser)
         member _.TagMap     = SQLiteTagMapData     conn
         member _.Theme      = SQLiteThemeData      conn
         member _.ThemeAsset = SQLiteThemeAssetData conn
         member _.Upload     = SQLiteUploadData     conn
-        member _.WebLog     = SQLiteWebLogData     conn
+        member _.WebLog     = SQLiteWebLogData     (conn, ser)
         member _.WebLogUser = SQLiteWebLogUserData conn
         
+        member _.Serializer = ser
+        
         member _.StartUp () = backgroundTask {
+            do! ensureTables ()
             
             use cmd = conn.CreateCommand ()
-            
-            // Theme tables
-            match! tableExists "theme" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating theme table..."
-                cmd.CommandText <- """
-                    CREATE TABLE theme (
-                        id       TEXT PRIMARY KEY,
-                        name     TEXT NOT NULL,
-                        version  TEXT NOT NULL)"""
-                do! write cmd
-            match! tableExists "theme_template" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating theme_template table..."
-                cmd.CommandText <- """
-                    CREATE TABLE theme_template (
-                        theme_id  TEXT NOT NULL REFERENCES theme (id),
-                        name      TEXT NOT NULL,
-                        template  TEXT NOT NULL,
-                        PRIMARY KEY (theme_id, name))"""
-                do! write cmd
-            match! tableExists "theme_asset" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating theme_asset table..."
-                cmd.CommandText <- """
-                    CREATE TABLE theme_asset (
-                        theme_id    TEXT NOT NULL REFERENCES theme (id),
-                        path        TEXT NOT NULL,
-                        updated_on  TEXT NOT NULL,
-                        data        BLOB NOT NULL,
-                        PRIMARY KEY (theme_id, path))"""
-                do! write cmd
-            
-            // Web log tables
-            match! tableExists "web_log" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating web_log table..."
-                cmd.CommandText <- """
-                    CREATE TABLE web_log (
-                        id                   TEXT PRIMARY KEY,
-                        name                 TEXT NOT NULL,
-                        slug                 TEXT NOT NULL,
-                        subtitle             TEXT,
-                        default_page         TEXT NOT NULL,
-                        posts_per_page       INTEGER NOT NULL,
-                        theme_id             TEXT NOT NULL REFERENCES theme (id),
-                        url_base             TEXT NOT NULL,
-                        time_zone            TEXT NOT NULL,
-                        auto_htmx            INTEGER NOT NULL DEFAULT 0,
-                        uploads              TEXT NOT NULL,
-                        is_feed_enabled      INTEGER NOT NULL DEFAULT 0,
-                        feed_name            TEXT NOT NULL,
-                        items_in_feed        INTEGER,
-                        is_category_enabled  INTEGER NOT NULL DEFAULT 0,
-                        is_tag_enabled       INTEGER NOT NULL DEFAULT 0,
-                        copyright            TEXT);
-                    CREATE INDEX web_log_theme_idx ON web_log (theme_id)"""
-                do! write cmd
-            match! tableExists "web_log_feed" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating web_log_feed table..."
-                cmd.CommandText <- """
-                    CREATE TABLE web_log_feed (
-                        id          TEXT PRIMARY KEY,
-                        web_log_id  TEXT NOT NULL REFERENCES web_log (id),
-                        source      TEXT NOT NULL,
-                        path        TEXT NOT NULL);
-                    CREATE INDEX web_log_feed_web_log_idx ON web_log_feed (web_log_id)"""
-                do! write cmd
-            match! tableExists "web_log_feed_podcast" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating web_log_feed_podcast table..."
-                cmd.CommandText <- """
-                    CREATE TABLE web_log_feed_podcast (
-                        feed_id             TEXT PRIMARY KEY REFERENCES web_log_feed (id),
-                        title               TEXT NOT NULL,
-                        subtitle            TEXT,
-                        items_in_feed       INTEGER NOT NULL,
-                        summary             TEXT NOT NULL,
-                        displayed_author    TEXT NOT NULL,
-                        email               TEXT NOT NULL,
-                        image_url           TEXT NOT NULL,
-                        apple_category      TEXT NOT NULL,
-                        apple_subcategory   TEXT,
-                        explicit            TEXT NOT NULL,
-                        default_media_type  TEXT,
-                        media_base_url      TEXT,
-                        podcast_guid        TEXT,
-                        funding_url         TEXT,
-                        funding_text        TEXT,
-                        medium              TEXT)"""
-                do! write cmd
-            
-            // Category table
-            match! tableExists "category" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating category table..."
-                cmd.CommandText <- """
-                    CREATE TABLE category (
-                        id           TEXT PRIMARY KEY,
-                        web_log_id   TEXT NOT NULL REFERENCES web_log (id),
-                        name         TEXT NOT NULL,
-                        slug         TEXT NOT NULL,
-                        description  TEXT,
-                        parent_id    TEXT);
-                    CREATE INDEX category_web_log_idx ON category (web_log_id)"""
-                do! write cmd
-            
-            // Web log user table
-            match! tableExists "web_log_user" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating web_log_user table..."
-                cmd.CommandText <- """
-                    CREATE TABLE web_log_user (
-                        id              TEXT PRIMARY KEY,
-                        web_log_id      TEXT NOT NULL REFERENCES web_log (id),
-                        email           TEXT NOT NULL,
-                        first_name      TEXT NOT NULL,
-                        last_name       TEXT NOT NULL,
-                        preferred_name  TEXT NOT NULL,
-                        password_hash   TEXT NOT NULL,
-                        salt            TEXT NOT NULL,
-                        url             TEXT,
-                        access_level    TEXT NOT NULL,
-                        created_on      TEXT NOT NULL,
-                        last_seen_on    TEXT);
-                    CREATE INDEX web_log_user_web_log_idx ON web_log_user (web_log_id);
-                    CREATE INDEX web_log_user_email_idx   ON web_log_user (web_log_id, email)"""
-                do! write cmd
-            
-            // Page tables
-            match! tableExists "page" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating page table..."
-                cmd.CommandText <- """
-                    CREATE TABLE page (
-                        id               TEXT PRIMARY KEY,
-                        web_log_id       TEXT NOT NULL REFERENCES web_log (id),
-                        author_id        TEXT NOT NULL REFERENCES web_log_user (id),
-                        title            TEXT NOT NULL,
-                        permalink        TEXT NOT NULL,
-                        published_on     TEXT NOT NULL,
-                        updated_on       TEXT NOT NULL,
-                        is_in_page_list  INTEGER NOT NULL DEFAULT 0,
-                        template         TEXT,
-                        page_text        TEXT NOT NULL);
-                    CREATE INDEX page_web_log_idx   ON page (web_log_id);
-                    CREATE INDEX page_author_idx    ON page (author_id);
-                    CREATE INDEX page_permalink_idx ON page (web_log_id, permalink)"""
-                do! write cmd
-            match! tableExists "page_meta" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating page_meta table..."
-                cmd.CommandText <- """
-                    CREATE TABLE page_meta (
-                        page_id  TEXT NOT NULL REFERENCES page (id),
-                        name     TEXT NOT NULL,
-                        value    TEXT NOT NULL,
-                        PRIMARY KEY (page_id, name, value))"""
-                do! write cmd
-            match! tableExists "page_permalink" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating page_permalink table..."
-                cmd.CommandText <- """
-                    CREATE TABLE page_permalink (
-                        page_id    TEXT NOT NULL REFERENCES page (id),
-                        permalink  TEXT NOT NULL,
-                        PRIMARY KEY (page_id, permalink))"""
-                do! write cmd
-            match! tableExists "page_revision" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating page_revision table..."
-                cmd.CommandText <- """
-                    CREATE TABLE page_revision (
-                        page_id        TEXT NOT NULL REFERENCES page (id),
-                        as_of          TEXT NOT NULL,
-                        revision_text  TEXT NOT NULL,
-                        PRIMARY KEY (page_id, as_of))"""
-                do! write cmd
-            
-            // Post tables
-            match! tableExists "post" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post (
-                        id            TEXT PRIMARY KEY,
-                        web_log_id    TEXT NOT NULL REFERENCES web_log (id),
-                        author_id     TEXT NOT NULL REFERENCES web_log_user (id),
-                        status        TEXT NOT NULL,
-                        title         TEXT NOT NULL,
-                        permalink     TEXT NOT NULL,
-                        published_on  TEXT,
-                        updated_on    TEXT NOT NULL,
-                        template      TEXT,
-                        post_text     TEXT NOT NULL);
-                    CREATE INDEX post_web_log_idx   ON post (web_log_id);
-                    CREATE INDEX post_author_idx    ON post (author_id);
-                    CREATE INDEX post_status_idx    ON post (web_log_id, status, updated_on);
-                    CREATE INDEX post_permalink_idx ON post (web_log_id, permalink)"""
-                do! write cmd
-            match! tableExists "post_category" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_category table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_category (
-                        post_id      TEXT NOT NULL REFERENCES post (id),
-                        category_id  TEXT NOT NULL REFERENCES category (id),
-                        PRIMARY KEY (post_id, category_id));
-                    CREATE INDEX post_category_category_idx ON post_category (category_id)"""
-                do! write cmd
-            match! tableExists "post_episode" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_episode table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_episode (
-                        post_id              TEXT PRIMARY KEY REFERENCES post(id),
-                        media                TEXT NOT NULL,
-                        length               INTEGER NOT NULL,
-                        duration             TEXT,
-                        media_type           TEXT,
-                        image_url            TEXT,
-                        subtitle             TEXT,
-                        explicit             TEXT,
-                        chapter_file         TEXT,
-                        chapter_type         TEXT,
-                        transcript_url       TEXT,
-                        transcript_type      TEXT,
-                        transcript_lang      TEXT,
-                        transcript_captions  INTEGER,
-                        season_number        INTEGER,
-                        season_description   TEXT,
-                        episode_number       TEXT,
-                        episode_description  TEXT)"""
-                do! write cmd
-            match! tableExists "post_tag" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_tag table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_tag (
-                        post_id  TEXT NOT NULL REFERENCES post (id),
-                        tag      TEXT NOT NULL,
-                        PRIMARY KEY (post_id, tag))"""
-                do! write cmd
-            match! tableExists "post_meta" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_meta table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_meta (
-                        post_id  TEXT NOT NULL REFERENCES post (id),
-                        name     TEXT NOT NULL,
-                        value    TEXT NOT NULL,
-                        PRIMARY KEY (post_id, name, value))"""
-                do! write cmd
-            match! tableExists "post_permalink" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_permalink table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_permalink (
-                        post_id    TEXT NOT NULL REFERENCES post (id),
-                        permalink  TEXT NOT NULL,
-                        PRIMARY KEY (post_id, permalink))"""
-                do! write cmd
-            match! tableExists "post_revision" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_revision table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_revision (
-                        post_id        TEXT NOT NULL REFERENCES post (id),
-                        as_of          TEXT NOT NULL,
-                        revision_text  TEXT NOT NULL,
-                        PRIMARY KEY (post_id, as_of))"""
-                do! write cmd
-            match! tableExists "post_comment" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating post_comment table..."
-                cmd.CommandText <- """
-                    CREATE TABLE post_comment (
-                        id              TEXT PRIMARY KEY,
-                        post_id         TEXT NOT NULL REFERENCES post(id),
-                        in_reply_to_id  TEXT,
-                        name            TEXT NOT NULL,
-                        email           TEXT NOT NULL,
-                        url             TEXT,
-                        status          TEXT NOT NULL,
-                        posted_on       TEXT NOT NULL,
-                        comment_text    TEXT NOT NULL);
-                    CREATE INDEX post_comment_post_idx ON post_comment (post_id)"""
-                do! write cmd
-            
-            // Tag map table
-            match! tableExists "tag_map" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating tag_map table..."
-                cmd.CommandText <- """
-                    CREATE TABLE tag_map (
-                        id          TEXT PRIMARY KEY,
-                        web_log_id  TEXT NOT NULL REFERENCES web_log (id),
-                        tag         TEXT NOT NULL,
-                        url_value   TEXT NOT NULL);
-                    CREATE INDEX tag_map_web_log_idx ON tag_map (web_log_id)"""
-                do! write cmd
-            
-            // Uploaded file table
-            match! tableExists "upload" with
-            | true -> ()
-            | false ->
-                log.LogInformation "Creating upload table..."
-                cmd.CommandText <- """
-                    CREATE TABLE upload (
-                        id          TEXT PRIMARY KEY,
-                        web_log_id  TEXT NOT NULL REFERENCES web_log (id),
-                        path        TEXT NOT NULL,
-                        updated_on  TEXT NOT NULL,
-                        data        BLOB NOT NULL);
-                    CREATE INDEX upload_web_log_idx ON upload (web_log_id);
-                    CREATE INDEX upload_path_idx    ON upload (web_log_id, path)"""
-                do! write cmd
+            cmd.CommandText <- "SELECT id FROM db_version"
+            use! rdr = cmd.ExecuteReaderAsync ()
+            let version = if rdr.Read () then Some (Map.getString "id" rdr) else None
+            match version with
+            | Some v when v = "v2-rc2" -> ()
+            | Some _
+            | None -> do! migrate version
         }

src/MyWebLog.Data/Utils.fs

@@ -5,6 +5,9 @@ module internal MyWebLog.Data.Utils
 open MyWebLog
 open MyWebLog.ViewModels
 
+/// The current database version
+let currentDbVersion = "v2-rc2"
+
 /// Create a category hierarchy from the given list of categories
 let rec orderByHierarchy (cats : Category list) parentId slugBase parentNames = seq {
     for cat in cats |> List.filter (fun c -> c.ParentId = parentId) do
@@ -20,3 +23,36 @@ let rec orderByHierarchy (cats : Category list) parentId slugBase parentNames =
         yield! orderByHierarchy cats (Some cat.Id) (Some fullSlug) ([ cat.Name ] |> List.append parentNames)
 }
 
+/// Get lists of items removed from and added to the given lists
+let diffLists<'T, 'U when 'U : equality> oldItems newItems (f : 'T -> 'U) =
+    let diff compList = fun item -> not (compList |> List.exists (fun other -> f item = f other))
+    List.filter (diff newItems) oldItems, List.filter (diff oldItems) newItems
+
+/// Find meta items added and removed
+let diffMetaItems (oldItems : MetaItem list) newItems =
+    diffLists oldItems newItems (fun item -> $"{item.Name}|{item.Value}")
+
+/// Find the permalinks added and removed
+let diffPermalinks oldLinks newLinks =
+    diffLists oldLinks newLinks Permalink.toString
+
+/// Find the revisions added and removed
+let diffRevisions oldRevs newRevs =
+    diffLists oldRevs newRevs (fun (rev : Revision) -> $"{rev.AsOf.ToUnixTimeTicks ()}|{MarkupText.toString rev.Text}")
+
+open MyWebLog.Converters
+open Newtonsoft.Json
+
+/// Serialize an object to JSON
+let serialize<'T> ser (item : 'T) =
+    JsonConvert.SerializeObject (item, Json.settings ser)
+
+/// Deserialize a JSON string 
+let deserialize<'T> (ser : JsonSerializer) value =
+    JsonConvert.DeserializeObject<'T> (value, Json.settings ser)
+
+open Microsoft.Extensions.Logging
+
+/// Log a migration step
+let logMigrationStep<'T> (log : ILogger<'T>) migration message =
+    log.LogInformation $"Migrating %s{migration}: %s{message}"

src/MyWebLog.Domain/DataTypes.fs

@@ -2,6 +2,7 @@
 
 open System
 open MyWebLog
+open NodaTime
 
 /// A category under which a post may be identified
 [<CLIMutable; NoComparison; NoEquality>]
@@ -64,7 +65,7 @@ type Comment =
         Status : CommentStatus
 
         /// When the comment was posted
-        PostedOn : DateTime
+        PostedOn : Instant
 
         /// The text of the comment
         Text : string
@@ -82,7 +83,7 @@ module Comment =
             Email       = ""
             Url         = None
             Status      = Pending
-            PostedOn    = DateTime.UtcNow
+            PostedOn    = Noda.epoch
             Text        = ""
         }
 
@@ -106,10 +107,10 @@ type Page =
         Permalink : Permalink
 
         /// When this page was published
-        PublishedOn : DateTime
+        PublishedOn : Instant
 
         /// When this page was last updated
-        UpdatedOn : DateTime
+        UpdatedOn : Instant
 
         /// Whether this page shows as part of the web log's navigation
         IsInPageList : bool
@@ -140,8 +141,8 @@ module Page =
             AuthorId        = WebLogUserId.empty
             Title           = ""
             Permalink       = Permalink.empty
-            PublishedOn     = DateTime.MinValue
-            UpdatedOn       = DateTime.MinValue
+            PublishedOn     = Noda.epoch
+            UpdatedOn       = Noda.epoch
             IsInPageList    = false
             Template        = None
             Text            = ""
@@ -173,10 +174,10 @@ type Post =
         Permalink : Permalink
 
         /// The instant on which the post was originally published
-        PublishedOn : DateTime option
+        PublishedOn : Instant option
 
         /// The instant on which the post was last updated
-        UpdatedOn : DateTime
+        UpdatedOn : Instant
 
         /// The template to use in displaying the post
         Template : string option
@@ -215,7 +216,7 @@ module Post =
             Title           = ""
             Permalink       = Permalink.empty
             PublishedOn     = None
-            UpdatedOn       = DateTime.MinValue
+            UpdatedOn       = Noda.epoch
             Text            = ""
             Template        = None
             CategoryIds     = []
@@ -288,7 +289,7 @@ type ThemeAsset =
         Id : ThemeAssetId
         
         /// The updated date (set from the file date from the ZIP archive)
-        UpdatedOn : DateTime
+        UpdatedOn : Instant
         
         /// The data for the asset
         Data : byte[]
@@ -300,7 +301,7 @@ module ThemeAsset =
     /// An empty theme asset
     let empty =
         {   Id        = ThemeAssetId (ThemeId "", "")
-            UpdatedOn = DateTime.MinValue
+            UpdatedOn = Noda.epoch
             Data      = [||]
         }
 
@@ -317,7 +318,7 @@ type Upload =
         Path : Permalink
         
         /// The updated date/time for this upload
-        UpdatedOn : DateTime
+        UpdatedOn : Instant
         
         /// The data for the upload
         Data : byte[]
@@ -331,7 +332,7 @@ module Upload =
         {   Id        = UploadId.empty
             WebLogId  = WebLogId.empty
             Path      = Permalink.empty
-            UpdatedOn = DateTime.MinValue
+            UpdatedOn = Noda.epoch
             Data      = [||]
         }
 
@@ -410,10 +411,11 @@ module WebLog =
         let _, leadPath = hostAndPath webLog
         $"{leadPath}/{Permalink.toString permalink}"
     
-    /// Convert a UTC date/time to the web log's local date/time
-    let localTime webLog (date : DateTime) =
-        TimeZoneInfo.ConvertTimeFromUtc
-            (DateTime (date.Ticks, DateTimeKind.Utc), TimeZoneInfo.FindSystemTimeZoneById webLog.TimeZone) 
+    /// Convert an Instant (UTC reference) to the web log's local date/time
+    let localTime webLog (date : Instant) =
+        match DateTimeZoneProviders.Tzdb[webLog.TimeZone] with
+        | null -> date.ToDateTimeUtc ()
+        | tz -> date.InZone(tz).ToDateTimeUnspecified ()
 
 
 /// A user of the web log
@@ -440,9 +442,6 @@ type WebLogUser =
         /// The hash of the user's password
         PasswordHash : string
 
-        /// Salt used to calculate the user's password hash
-        Salt : Guid
-
         /// The URL of the user's personal site
         Url : string option
 
@@ -450,10 +449,10 @@ type WebLogUser =
         AccessLevel : AccessLevel
         
         /// When the user was created
-        CreatedOn : DateTime
+        CreatedOn : Instant
         
         /// When the user last logged on
-        LastSeenOn : DateTime option
+        LastSeenOn : Instant option
     }
 
 /// Functions to support web log users
@@ -468,10 +467,9 @@ module WebLogUser =
             LastName      = ""
             PreferredName = ""
             PasswordHash  = ""
-            Salt          = Guid.Empty
             Url           = None
             AccessLevel   = Author
-            CreatedOn     = DateTime.UnixEpoch
+            CreatedOn     = Noda.epoch
             LastSeenOn    = None
         }
     

src/MyWebLog.Domain/MyWebLog.Domain.fsproj

@@ -7,9 +7,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Markdig" Version="0.30.2" />
+    <PackageReference Include="Markdig" Version="0.30.3" />
     <PackageReference Update="FSharp.Core" Version="6.0.5" />
     <PackageReference Include="Markdown.ColorCode" Version="1.0.1" />
+    <PackageReference Include="NodaTime" Version="3.1.2" />
   </ItemGroup>
 
 </Project>

src/MyWebLog.Domain/SupportTypes.fs

@@ -1,6 +1,7 @@
 namespace MyWebLog
 
 open System
+open NodaTime
 
 /// Support functions for domain definition
 [<AutoOpen>]
@@ -12,6 +13,29 @@ module private Helpers =
         Convert.ToBase64String(Guid.NewGuid().ToByteArray ()).Replace('/', '_').Replace('+', '-').Substring (0, 22)
 
 
+/// Functions to support NodaTime manipulation
+module Noda =
+    
+    /// The clock to use when getting "now" (will make mutable for testing)
+    let clock : IClock = SystemClock.Instance
+    
+    /// The Unix epoch
+    let epoch = Instant.FromUnixTimeSeconds 0L
+    
+        
+    /// Truncate an instant to remove fractional seconds
+    let toSecondsPrecision (value : Instant) =
+        Instant.FromUnixTimeSeconds (value.ToUnixTimeSeconds ())
+    
+    /// The current Instant, with fractional seconds truncated
+    let now () =
+        toSecondsPrecision (clock.GetCurrentInstant ())
+    
+    /// Convert a date/time to an Instant with whole seconds
+    let fromDateTime (dt : DateTime) =
+        toSecondsPrecision (Instant.FromDateTimeUtc (DateTime (dt.Ticks, DateTimeKind.Utc)))
+
+
 /// A user's access level
 type AccessLevel =
     /// The user may create and publish posts and edit the ones they have created
@@ -137,6 +161,8 @@ module ExplicitRating =
         | x       -> raise (invalidArg "rating" $"{x} is not a valid explicit rating")
 
 
+open NodaTime.Text
+
 /// A podcast episode
 type Episode =
     {   /// The URL to the media file for the episode (may be permalink)
@@ -146,7 +172,7 @@ type Episode =
         Length : int64
         
         /// The duration of the episode
-        Duration : TimeSpan option
+        Duration : Duration option
         
         /// The media type of the file (overrides podcast default if present)
         MediaType : string option
@@ -215,6 +241,10 @@ module Episode =
             EpisodeDescription = None
         }
     
+    /// Format a duration for an episode
+    let formatDuration ep =
+        ep.Duration |> Option.map (DurationPattern.CreateWithInvariantCulture("H:mm:ss").Format)
+
 
 open Markdig
 open Markdown.ColorCode
@@ -269,12 +299,11 @@ module MetaItem =
     let empty =
         { Name = ""; Value = "" }
 
-        
 /// A revision of a page or post
 [<CLIMutable; NoComparison; NoEquality>]
 type Revision =
     {   /// When this revision was saved
-        AsOf : DateTime
+        AsOf : Instant
 
         /// The text of the revision
         Text : MarkupText
@@ -285,7 +314,7 @@ module Revision =
     
     /// An empty revision
     let empty =
-        {   AsOf = DateTime.UtcNow
+        {   AsOf = Noda.epoch
             Text = Html ""
         }
 

src/MyWebLog.Domain/ViewModels.fs

@@ -2,6 +2,7 @@
 
 open System
 open MyWebLog
+open NodaTime
 
 /// Helper functions for view models
 [<AutoOpen>]
@@ -138,8 +139,8 @@ type DisplayPage =
             AuthorId     = WebLogUserId.toString page.AuthorId
             Title        = page.Title
             Permalink    = Permalink.toString page.Permalink
-            PublishedOn  = page.PublishedOn
-            UpdatedOn    = page.UpdatedOn
+            PublishedOn  = WebLog.localTime webLog page.PublishedOn
+            UpdatedOn    = WebLog.localTime webLog page.UpdatedOn
             IsInPageList = page.IsInPageList
             IsDefault    = pageId = webLog.DefaultPage
             Text         = ""
@@ -154,8 +155,8 @@ type DisplayPage =
             AuthorId     = WebLogUserId.toString page.AuthorId
             Title        = page.Title
             Permalink    = Permalink.toString page.Permalink
-            PublishedOn  = page.PublishedOn
-            UpdatedOn    = page.UpdatedOn
+            PublishedOn  = WebLog.localTime webLog page.PublishedOn
+            UpdatedOn    = WebLog.localTime webLog page.UpdatedOn
             IsInPageList = page.IsInPageList
             IsDefault    = pageId = webLog.DefaultPage
             Text         = addBaseToRelativeUrls extra page.Text
@@ -179,7 +180,7 @@ with
 
     /// Create a display revision from an actual revision
     static member fromRevision webLog (rev : Revision) =
-        {   AsOf      = rev.AsOf
+        {   AsOf      = rev.AsOf.ToDateTimeUtc ()
             AsOfLocal = WebLog.localTime webLog rev.AsOf
             Format    = MarkupText.sourceType rev.Text
         }
@@ -703,7 +704,7 @@ type EditPostModel =
             match post.Revisions |> List.sortByDescending (fun r -> r.AsOf) |> List.tryHead with
             | Some rev -> rev
             | None -> Revision.empty
-        let post = if post.Metadata |> List.isEmpty then { post with Metadata = [ MetaItem.empty ] } else post
+        let post    = if post.Metadata |> List.isEmpty then { post with Metadata = [ MetaItem.empty ] } else post
         let episode = defaultArg post.Episode Episode.empty
         {   PostId             = PostId.toString post.Id
             Title              = post.Title
@@ -723,7 +724,7 @@ type EditPostModel =
             IsEpisode          = Option.isSome post.Episode
             Media              = episode.Media
             Length             = episode.Length
-            Duration           = defaultArg (episode.Duration |> Option.map (fun it -> it.ToString """hh\:mm\:ss""")) ""
+            Duration           = defaultArg (Episode.formatDuration episode) ""
             MediaType          = defaultArg episode.MediaType ""
             ImageUrl           = defaultArg episode.ImageUrl ""
             Subtitle           = defaultArg episode.Subtitle ""
@@ -781,7 +782,8 @@ type EditPostModel =
                         Some {
                             Media              = this.Media
                             Length             = this.Length
-                            Duration           = noneIfBlank this.Duration |> Option.map TimeSpan.Parse
+                            Duration           = noneIfBlank this.Duration
+                                                 |> Option.map (TimeSpan.Parse >> Duration.FromTimeSpan)
                             MediaType          = noneIfBlank this.MediaType
                             ImageUrl           = noneIfBlank this.ImageUrl
                             Subtitle           = noneIfBlank this.Subtitle

src/MyWebLog/Caches.fs

@@ -56,7 +56,6 @@ module Extensions =
             defaultArg (this.UserAccessLevel |> Option.map (AccessLevel.hasAccess level)) false
 
 
-
 open System.Collections.Concurrent
 
 /// <summary>

src/MyWebLog/Handlers/Admin.fs

@@ -5,6 +5,7 @@ open System.Threading.Tasks
 open Giraffe
 open MyWebLog
 open MyWebLog.ViewModels
+open NodaTime
 
 /// ~~ DASHBOARDS ~~
 module Dashboard =
@@ -12,23 +13,22 @@ module Dashboard =
     // GET /admin/dashboard
     let user : HttpHandler = requireAccess Author >=> fun next ctx -> task {
         let getCount (f : WebLogId -> Task<int>) = f ctx.WebLog.Id
-        let data    = ctx.Data
-        let posts   = getCount (data.Post.CountByStatus Published)
-        let drafts  = getCount (data.Post.CountByStatus Draft)
-        let pages   = getCount data.Page.CountAll
-        let listed  = getCount data.Page.CountListed
-        let cats    = getCount data.Category.CountAll
-        let topCats = getCount data.Category.CountTopLevel
-        let! _ = Task.WhenAll (posts, drafts, pages, listed, cats, topCats)
+        let  data    = ctx.Data
+        let! posts   = getCount (data.Post.CountByStatus Published)
+        let! drafts  = getCount (data.Post.CountByStatus Draft)
+        let! pages   = getCount data.Page.CountAll
+        let! listed  = getCount data.Page.CountListed
+        let! cats    = getCount data.Category.CountAll
+        let! topCats = getCount data.Category.CountTopLevel
         return!
             hashForPage "Dashboard"
             |> addToHash ViewContext.Model {
-                    Posts              = posts.Result
-                    Drafts             = drafts.Result
-                    Pages              = pages.Result
-                    ListedPages        = listed.Result
-                    Categories         = cats.Result
-                    TopLevelCategories = topCats.Result
+                    Posts              = posts
+                    Drafts             = drafts
+                    Pages              = pages
+                    ListedPages        = listed
+                    Categories         = cats
+                    TopLevelCategories = topCats
                 }
             |> adminView "dashboard" next ctx
     }
@@ -344,7 +344,8 @@ module Theme =
                 do! asset.Open().CopyToAsync stream
                 do! data.ThemeAsset.Save
                         {   Id        = ThemeAssetId (themeId, assetName)
-                            UpdatedOn = asset.LastWriteTime.DateTime
+                            UpdatedOn = LocalDateTime.FromDateTime(asset.LastWriteTime.DateTime)
+                                            .InZoneLeniently(DateTimeZone.Utc).ToInstant ()
                             Data      = stream.ToArray ()
                         }
     }

src/MyWebLog/Handlers/Feed.fs

@@ -95,8 +95,8 @@ let private toFeedItem webLog (authors : MetaItem list) (cats : DisplayCategory[
     let item = SyndicationItem (
         Id              = WebLog.absoluteUrl webLog post.Permalink,
         Title           = TextSyndicationContent.CreateHtmlContent post.Title,
-        PublishDate     = DateTimeOffset post.PublishedOn.Value,
-        LastUpdatedTime = DateTimeOffset post.UpdatedOn,
+        PublishDate     = post.PublishedOn.Value.ToDateTimeOffset (),
+        LastUpdatedTime = post.UpdatedOn.ToDateTimeOffset (),
         Content         = TextSyndicationContent.CreatePlaintextContent plainText)
     item.AddPermalink (Uri item.Id)
     
@@ -163,8 +163,8 @@ let private addEpisode webLog (podcast : PodcastOptions) (episode : Episode) (po
     item.ElementExtensions.Add ("author",   Namespace.iTunes, podcast.DisplayedAuthor)
     item.ElementExtensions.Add ("explicit", Namespace.iTunes, epExplicit)
     episode.Subtitle |> Option.iter (fun it -> item.ElementExtensions.Add ("subtitle", Namespace.iTunes, it))
-    episode.Duration
-    |> Option.iter (fun it -> item.ElementExtensions.Add ("duration", Namespace.iTunes, it.ToString """hh\:mm\:ss"""))
+    Episode.formatDuration episode
+    |> Option.iter (fun it -> item.ElementExtensions.Add ("duration", Namespace.iTunes, it))
     
     match episode.ChapterFile with
     | Some chapters ->
@@ -381,7 +381,7 @@ let createFeed (feedType : FeedType) posts : HttpHandler = fun next ctx -> backg
     addNamespace feed "content" Namespace.content
     setTitleAndDescription feedType webLog cats feed
     
-    feed.LastUpdatedTime <- (List.head posts).UpdatedOn |> DateTimeOffset
+    feed.LastUpdatedTime <- (List.head posts).UpdatedOn.ToDateTimeOffset ()
     feed.Generator       <- ctx.Generator
     feed.Items           <- posts |> Seq.ofList |> Seq.map toItem
     feed.Language        <- "en"

src/MyWebLog/Handlers/Helpers.fs

@@ -419,10 +419,11 @@ let getCategoryIds slug ctx =
 
 open System
 open System.Globalization
+open NodaTime
 
 /// Parse a date/time to UTC 
 let parseToUtc (date : string) =
-    DateTime.Parse (date, null, DateTimeStyles.AdjustToUniversal)
+    Instant.FromDateTimeUtc (DateTime.Parse (date, null, DateTimeStyles.AdjustToUniversal))
 
 open Microsoft.Extensions.DependencyInjection
 open Microsoft.Extensions.Logging

src/MyWebLog/Handlers/Page.fs

@@ -139,15 +139,13 @@ let previewRevision (pgId, revDate) : HttpHandler = requireAccess Author >=> fun
     | _, None -> return! Error.notFound next ctx
 }
 
-open System
-
 // POST /admin/page/{id}/revision/{revision-date}/restore
 let restoreRevision (pgId, revDate) : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     match! findPageRevision pgId revDate ctx with
     | Some pg, Some rev when canEdit pg.AuthorId ctx ->
         do! ctx.Data.Page.Update
                 { pg with
-                    Revisions = { rev with AsOf = DateTime.UtcNow }
+                    Revisions = { rev with AsOf = Noda.now () }
                                   :: (pg.Revisions |> List.filter (fun r -> r.AsOf <> rev.AsOf))
                 }
         do! addMessage ctx { UserMessage.success with Message = "Revision restored successfully" }
@@ -173,7 +171,7 @@ let deleteRevision (pgId, revDate) : HttpHandler = requireAccess Author >=> fun
 let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     let! model   = ctx.BindFormAsync<EditPageModel> ()
     let  data    = ctx.Data
-    let  now     = DateTime.UtcNow
+    let  now     = Noda.now ()
     let  tryPage =
         if model.IsNew then
             { Page.empty with

src/MyWebLog/Handlers/Post.fs

@@ -52,9 +52,9 @@ let preparePostList webLog posts listType (url : string) pageNbr perPage (data :
     let! olderPost, newerPost =
         match listType with
         | SinglePost ->
-            let post     = List.head posts
-            let dateTime = defaultArg post.PublishedOn post.UpdatedOn
-            data.Post.FindSurroundingPosts webLog.Id dateTime
+            let post   = List.head posts
+            let target = defaultArg post.PublishedOn post.UpdatedOn
+            data.Post.FindSurroundingPosts webLog.Id target
         | _ -> Task.FromResult (None, None)
     let newerLink =
         match listType, pageNbr with
@@ -350,7 +350,7 @@ let restoreRevision (postId, revDate) : HttpHandler = requireAccess Author >=> f
     | Some post, Some rev when canEdit post.AuthorId ctx ->
         do! ctx.Data.Post.Update
                 { post with
-                    Revisions = { rev with AsOf = DateTime.UtcNow }
+                    Revisions = { rev with AsOf = Noda.now () }
                                   :: (post.Revisions |> List.filter (fun r -> r.AsOf <> rev.AsOf))
                 }
         do! addMessage ctx { UserMessage.success with Message = "Revision restored successfully" }
@@ -376,7 +376,6 @@ let deleteRevision (postId, revDate) : HttpHandler = requireAccess Author >=> fu
 let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     let! model   = ctx.BindFormAsync<EditPostModel> ()
     let  data    = ctx.Data
-    let  now     = DateTime.UtcNow
     let  tryPost =
         if model.IsNew then
             { Post.empty with
@@ -389,7 +388,7 @@ let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     | Some post when canEdit post.AuthorId ctx ->
         let priorCats   = post.CategoryIds
         let updatedPost =
-            model.UpdatePost post now
+            model.UpdatePost post (Noda.now ())
             |> function
             | post ->
                 if model.SetPublished then

src/MyWebLog/Handlers/Routes.fs

@@ -94,7 +94,7 @@ module Asset =
         | Some asset ->
             match Upload.checkModified asset.UpdatedOn ctx with
             | Some threeOhFour -> return! threeOhFour next ctx
-            | None -> return! Upload.sendFile asset.UpdatedOn path asset.Data next ctx
+            | None -> return! Upload.sendFile (asset.UpdatedOn.ToDateTimeUtc ()) path asset.Data next ctx
         | None -> return! Error.notFound next ctx
     }
 

src/MyWebLog/Handlers/Upload.fs

@@ -29,15 +29,17 @@ module private Helpers =
 
 // ~~ SERVING UPLOADS ~~
 
+open System.Globalization
 open Giraffe
 open Microsoft.AspNetCore.Http
+open NodaTime
 
 /// Determine if the file has been modified since the date/time specified by the If-Modified-Since header
 let checkModified since (ctx : HttpContext) : HttpHandler option =
     match ctx.Request.Headers.IfModifiedSince with
     | it when it.Count < 1 -> None
-    | it when since > DateTime.Parse it[0] -> None
-    | _ -> Some (setStatusCode 304 >=> setBodyFromString "Not Modified")
+    | it when since > Instant.FromDateTimeUtc (DateTime.Parse (it[0], null, DateTimeStyles.AdjustToUniversal)) -> None
+    | _ -> Some (setStatusCode 304)
 
 
 open Microsoft.AspNetCore.Http.Headers
@@ -73,7 +75,7 @@ let serve (urlParts : string seq) : HttpHandler = fun next ctx -> task {
             | Some upload ->
                 match checkModified upload.UpdatedOn ctx with
                 | Some threeOhFour -> return! threeOhFour next ctx
-                | None -> return! sendFile upload.UpdatedOn path upload.Data next ctx
+                | None -> return! sendFile (upload.UpdatedOn.ToDateTimeUtc ()) path upload.Data next ctx
             | None -> return! Error.notFound next ctx
     else
         return! Error.notFound next ctx
@@ -143,7 +145,8 @@ let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
         let upload    = Seq.head ctx.Request.Form.Files
         let fileName  = String.Concat (makeSlug (Path.GetFileNameWithoutExtension upload.FileName),
                                        Path.GetExtension(upload.FileName).ToLowerInvariant ())
-        let  localNow = WebLog.localTime ctx.WebLog DateTime.Now
+        let  now      = Noda.now ()
+        let  localNow = WebLog.localTime ctx.WebLog now
         let  year     = localNow.ToString "yyyy"
         let  month    = localNow.ToString "MM"
         let! form     = ctx.BindFormAsync<UploadFileModel> ()
@@ -156,7 +159,7 @@ let save : HttpHandler = requireAccess Author >=> fun next ctx -> task {
                 {   Id        = UploadId.create ()
                     WebLogId  = ctx.WebLog.Id
                     Path      = Permalink $"{year}/{month}/{fileName}"
-                    UpdatedOn = DateTime.UtcNow
+                    UpdatedOn = now
                     Data      = stream.ToArray ()
                 }
             do! ctx.Data.Upload.Add file

src/MyWebLog/Handlers/User.fs

@@ -2,19 +2,32 @@
 module MyWebLog.Handlers.User
 
 open System
-open System.Security.Cryptography
-open System.Text
+open Microsoft.AspNetCore.Http
+open Microsoft.AspNetCore.Identity
+open MyWebLog
+open NodaTime
 
 // ~~ LOG ON / LOG OFF ~~
 
-/// Hash a password for a given user
-let hashedPassword (plainText : string) (email : string) (salt : Guid) =
-    let allSalt = Array.concat [ salt.ToByteArray (); Encoding.UTF8.GetBytes email ] 
-    use alg     = new Rfc2898DeriveBytes (plainText, allSalt, 2_048)
-    Convert.ToBase64String (alg.GetBytes 64)
+/// Create a password hash a password for a given user
+let createPasswordHash user password =
+    PasswordHasher<WebLogUser>().HashPassword (user, password)
+
+/// Verify whether a password is valid
+let verifyPassword user password (ctx : HttpContext) = backgroundTask {
+    match user with
+    | Some usr ->
+        let hasher = PasswordHasher<WebLogUser> ()
+        match hasher.VerifyHashedPassword (usr, usr.PasswordHash, password) with
+        | PasswordVerificationResult.Success -> return Ok ()
+        | PasswordVerificationResult.SuccessRehashNeeded ->
+            do! ctx.Data.WebLogUser.Update { usr with PasswordHash = hasher.HashPassword (usr, password) }
+            return Ok ()
+        | _ -> return Error "Log on attempt unsuccessful"
+    | None -> return Error "Log on attempt unsuccessful"
+}
 
 open Giraffe
-open MyWebLog
 open MyWebLog.ViewModels
 
 // GET /user/log-on
@@ -35,10 +48,12 @@ open Microsoft.AspNetCore.Authentication.Cookies
 
 // POST /user/log-on
 let doLogOn : HttpHandler = fun next ctx -> task {
-    let! model = ctx.BindFormAsync<LogOnModel> ()
-    let  data  = ctx.Data
-    match! data.WebLogUser.FindByEmail model.EmailAddress ctx.WebLog.Id with 
-    | Some user when user.PasswordHash = hashedPassword model.Password user.Email user.Salt ->
+    let! model   = ctx.BindFormAsync<LogOnModel> ()
+    let  data    = ctx.Data
+    let! tryUser = data.WebLogUser.FindByEmail model.EmailAddress ctx.WebLog.Id
+    match! verifyPassword tryUser model.Password ctx with 
+    | Ok _ ->
+        let user = tryUser.Value
         let claims = seq {
             Claim (ClaimTypes.NameIdentifier, WebLogUserId.toString user.Id)
             Claim (ClaimTypes.Name,           $"{user.FirstName} {user.LastName}")
@@ -59,8 +74,8 @@ let doLogOn : HttpHandler = fun next ctx -> task {
             match model.ReturnTo with
             | Some url -> redirectTo false url next ctx
             | None -> redirectToGet "admin/dashboard" next ctx
-    | _ ->
-        do! addMessage ctx { UserMessage.error with Message = "Log on attempt unsuccessful" }
+    | Error msg ->
+        do! addMessage ctx { UserMessage.error with Message = msg }
         return! logOn model.ReturnTo next ctx
 }
 
@@ -147,7 +162,9 @@ let private showMyInfo (model : EditMyInfoModel) (user : WebLogUser) : HttpHandl
     |> addToHash ViewContext.Model model
     |> addToHash "access_level"    (AccessLevel.toString user.AccessLevel)
     |> addToHash "created_on"      (WebLog.localTime ctx.WebLog user.CreatedOn)
-    |> addToHash "last_seen_on"    (WebLog.localTime ctx.WebLog (defaultArg user.LastSeenOn DateTime.UnixEpoch))
+    |> addToHash "last_seen_on"    (WebLog.localTime ctx.WebLog
+                                         (defaultArg user.LastSeenOn (Instant.FromUnixTimeSeconds 0)))
+                                         
     |> adminView "my-info" next ctx
 
 
@@ -164,19 +181,13 @@ let saveMyInfo : HttpHandler = requireAccess Author >=> fun next ctx -> task {
     let  data  = ctx.Data
     match! data.WebLogUser.FindById ctx.UserId ctx.WebLog.Id with
     | Some user when model.NewPassword = model.NewPasswordConfirm ->
-        let pw, salt =
-            if model.NewPassword = "" then
-                user.PasswordHash, user.Salt
-            else
-                let newSalt = Guid.NewGuid ()
-                hashedPassword model.NewPassword user.Email newSalt, newSalt
+        let pw = if model.NewPassword = "" then user.PasswordHash else createPasswordHash user model.NewPassword
         let user =
             { user with
                 FirstName     = model.FirstName
                 LastName      = model.LastName
                 PreferredName = model.PreferredName
                 PasswordHash  = pw
-                Salt          = salt
             }
         do! data.WebLogUser.Update user
         let pwMsg = if model.NewPassword = "" then "" else " and updated your password"
@@ -198,9 +209,9 @@ let save : HttpHandler = requireAccess WebLogAdmin >=> fun next ctx -> task {
     let  tryUser =
         if model.IsNew then
             { WebLogUser.empty with
-                Id = WebLogUserId.create ()
-                WebLogId = ctx.WebLog.Id
-                CreatedOn = DateTime.UtcNow
+                Id        = WebLogUserId.create ()
+                WebLogId  = ctx.WebLog.Id
+                CreatedOn = Noda.now ()
             } |> someTask
         else data.WebLogUser.FindById (WebLogUserId model.Id) ctx.WebLog.Id
     match! tryUser with
@@ -211,9 +222,7 @@ let save : HttpHandler = requireAccess WebLogAdmin >=> fun next ctx -> task {
         else
             let toUpdate =
                 if model.Password = "" then updatedUser
-                else
-                    let salt = Guid.NewGuid ()
-                    { updatedUser with PasswordHash = hashedPassword model.Password model.Email salt; Salt = salt }
+                else { updatedUser with PasswordHash = createPasswordHash updatedUser model.Password }
             do! (if model.IsNew then data.WebLogUser.Add else data.WebLogUser.Update) toUpdate
             do! addMessage ctx
                     { UserMessage.success with
@@ -227,4 +236,3 @@ let save : HttpHandler = requireAccess WebLogAdmin >=> fun next ctx -> task {
                 next ctx
     | None -> return! Error.notFound next ctx
 }
-

src/MyWebLog/Maintenance.fs

@@ -4,6 +4,7 @@ open System
 open System.IO
 open Microsoft.Extensions.DependencyInjection
 open MyWebLog.Data
+open NodaTime
 
 /// Create the web log information
 let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
@@ -41,22 +42,19 @@ let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
             }
     
     // Create the admin user
-    let salt = Guid.NewGuid ()
-    let now  = DateTime.UtcNow
-    
-    do! data.WebLogUser.Add 
-            { WebLogUser.empty with
-                Id            = userId
-                WebLogId      = webLogId
-                Email         = args[3]
-                FirstName     = "Admin"
-                LastName      = "User"
-                PreferredName = "Admin"
-                PasswordHash  = Handlers.User.hashedPassword args[4] args[3] salt
-                Salt          = salt
-                AccessLevel   = accessLevel
-                CreatedOn     = now
-            }
+    let now  = Noda.now ()
+    let user =
+        { WebLogUser.empty with
+            Id            = userId
+            WebLogId      = webLogId
+            Email         = args[3]
+            FirstName     = "Admin"
+            LastName      = "User"
+            PreferredName = "Admin"
+            AccessLevel   = accessLevel
+            CreatedOn     = now
+        }
+    do! data.WebLogUser.Add { user with PasswordHash = Handlers.User.createPasswordHash user args[4] }
 
     // Create the default home page
     do! data.Page.Add
@@ -70,8 +68,8 @@ let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
                 UpdatedOn   = now
                 Text        = "<p>This is your default home page.</p>"
                 Revisions   = [
-                    { AsOf = now
-                      Text = Html "<p>This is your default home page.</p>"
+                    {   AsOf = now
+                        Text = Html "<p>This is your default home page.</p>"
                     }
                 ]
             }
@@ -155,7 +153,6 @@ let loadTheme (args : string[]) (sp : IServiceProvider) = task {
 /// Back up a web log's data
 module Backup =
     
-    open System.Threading.Tasks
     open MyWebLog.Converters
     open Newtonsoft.Json
 
@@ -165,7 +162,7 @@ module Backup =
             Id : ThemeAssetId
             
             /// The updated date for this asset
-            UpdatedOn : DateTime
+            UpdatedOn : Instant
             
             /// The data for this asset, base-64 encoded
             Data : string
@@ -197,7 +194,7 @@ module Backup =
             Path : Permalink
             
             /// The date/time this upload was last updated (file time)
-            UpdatedOn : DateTime
+            UpdatedOn : Instant
             
             /// The data for the upload, base-64 encoded
             Data : string
@@ -251,10 +248,9 @@ module Backup =
             Uploads : EncodedUpload list
         }
     
-    /// Create a JSON serializer (uses RethinkDB data implementation's JSON converters)
+    /// Create a JSON serializer
     let private getSerializer prettyOutput =
-        let serializer = JsonSerializer.CreateDefault ()
-        Json.all () |> Seq.iter serializer.Converters.Add
+        let serializer = Json.configure (JsonSerializer.CreateDefault ())
         if prettyOutput then serializer.Formatting <- Formatting.Indented
         serializer
     
@@ -382,7 +378,8 @@ module Backup =
         printfn ""
         printfn "- Importing theme..."
         do! data.Theme.Save restore.Theme
-        let! _ = restore.Assets |> List.map (EncodedAsset.toAsset >> data.ThemeAsset.Save) |> Task.WhenAll
+        restore.Assets
+        |> List.iter (EncodedAsset.toAsset >> data.ThemeAsset.Save >> Async.AwaitTask >> Async.RunSynchronously)
         
         // Restore web log data
         
@@ -393,19 +390,20 @@ module Backup =
         do! data.WebLogUser.Restore restore.Users
         
         printfn "- Restoring categories and tag mappings..."
-        do! data.TagMap.Restore   restore.TagMappings
-        do! data.Category.Restore restore.Categories
+        if not (List.isEmpty restore.TagMappings) then do! data.TagMap.Restore   restore.TagMappings
+        if not (List.isEmpty restore.Categories)  then do! data.Category.Restore restore.Categories
         
         printfn "- Restoring pages..."
-        do! data.Page.Restore restore.Pages
+        if not (List.isEmpty restore.Pages) then do! data.Page.Restore restore.Pages
         
         printfn "- Restoring posts..."
-        do! data.Post.Restore restore.Posts
+        if not (List.isEmpty restore.Posts) then do! data.Post.Restore restore.Posts
         
         // TODO: comments not yet implemented
         
         printfn "- Restoring uploads..."
-        do! data.Upload.Restore (restore.Uploads |> List.map EncodedUpload.toUpload)
+        if not (List.isEmpty restore.Uploads) then
+            do! data.Upload.Restore (restore.Uploads |> List.map EncodedUpload.toUpload)
         
         displayStats "Restored for <>NAME<>:" restore.WebLog restore
     }
@@ -490,3 +488,22 @@ let upgradeUser (args : string[]) (sp : IServiceProvider) = task {
     | 3 -> do! doUserUpgrade args[1] args[2] (sp.GetRequiredService<IData> ())
     | _ -> eprintfn "Usage: myWebLog upgrade-user [web-log-url-base] [email-address]"
 }
+
+/// Set a user's password
+let doSetPassword urlBase email password (data : IData) = task {
+    match! data.WebLog.FindByHost urlBase with
+    | Some webLog ->
+        match! data.WebLogUser.FindByEmail email webLog.Id with
+        | Some user ->
+            do! data.WebLogUser.Update { user with PasswordHash = Handlers.User.createPasswordHash user password }
+            printfn $"Password for user {email} at {webLog.Name} set successfully"
+        | None -> eprintfn $"ERROR: no user {email} found at {urlBase}"
+    | None -> eprintfn $"ERROR: no web log found for {urlBase}"
+}
+
+/// Set a user's password if the command-line arguments are good
+let setPassword (args : string[]) (sp : IServiceProvider) = task {
+    match args.Length with
+    | 4 -> do! doSetPassword args[1] args[2] args[3] (sp.GetRequiredService<IData> ())
+    | _ -> eprintfn "Usage: myWebLog set-password [web-log-url-base] [email-address] [password]"
+}

src/MyWebLog/Program.fs

@@ -29,11 +29,14 @@ type WebLogMiddleware (next : RequestDelegate, log : ILogger<WebLogMiddleware>)
 open System
 open Microsoft.Extensions.DependencyInjection
 open MyWebLog.Data
+open Newtonsoft.Json
+open Npgsql
 
 /// Logic to obtain a data connection and implementation based on configured values
 module DataImplementation =
     
     open MyWebLog.Converters
+    // open Npgsql.Logging
     open RethinkDb.Driver.FSharp
     open RethinkDb.Driver.Net
 
@@ -43,23 +46,29 @@ module DataImplementation =
         let await it = (Async.AwaitTask >> Async.RunSynchronously) it
         let connStr    name = config.GetConnectionString name
         let hasConnStr name = (connStr >> isNull >> not) name
-        let createSQLite connStr =
+        let createSQLite connStr : IData =
             let log  = sp.GetRequiredService<ILogger<SQLiteData>> ()
             let conn = new SqliteConnection (connStr)
             log.LogInformation $"Using SQLite database {conn.DataSource}"
             await (SQLiteData.setUpConnection conn)
-            SQLiteData (conn, log)
+            SQLiteData (conn, log, Json.configure (JsonSerializer.CreateDefault ()))
         
         if hasConnStr "SQLite" then
-            upcast createSQLite (connStr "SQLite")
+            createSQLite (connStr "SQLite")
         elif hasConnStr "RethinkDB" then
-            let log = sp.GetRequiredService<ILogger<RethinkDbData>> ()
-            Json.all () |> Seq.iter Converter.Serializer.Converters.Add 
+            let log        = sp.GetRequiredService<ILogger<RethinkDbData>> ()
+            let _          = Json.configure Converter.Serializer 
             let rethinkCfg = DataConfig.FromUri (connStr "RethinkDB")
             let conn       = await (rethinkCfg.CreateConnectionAsync log)
-            upcast RethinkDbData (conn, rethinkCfg, log)
+            RethinkDbData (conn, rethinkCfg, log)
+        elif hasConnStr "PostgreSQL" then
+            let log  = sp.GetRequiredService<ILogger<PostgresData>> ()
+            // NpgsqlLogManager.Provider <- ConsoleLoggingProvider NpgsqlLogLevel.Debug
+            let conn = new NpgsqlConnection (connStr "PostgreSQL")
+            log.LogInformation $"Using PostgreSQL database {conn.Host}:{conn.Port}/{conn.Database}"
+            PostgresData (conn, log, Json.configure (JsonSerializer.CreateDefault ()))
         else
-            upcast createSQLite "Data Source=./myweblog.db;Cache=Shared"
+            createSQLite "Data Source=./myweblog.db;Cache=Shared"
 
 
 open System.Threading.Tasks
@@ -76,6 +85,7 @@ let showHelp () =
     printfn "init          Initializes a new web log"
     printfn "load-theme    Load a theme"
     printfn "restore       Restore a JSON file backup (prompt before overwriting)"
+    printfn "set-password  Set a password for a specific user"
     printfn "upgrade-user  Upgrade a WebLogAdmin user to a full Administrator"
     printfn " "
     printfn "For more information on a particular command, run it with no options."
@@ -88,6 +98,7 @@ open Giraffe.EndpointRouting
 open Microsoft.AspNetCore.Authentication.Cookies
 open Microsoft.AspNetCore.Builder
 open Microsoft.AspNetCore.HttpOverrides
+open Microsoft.Extensions.Caching.Distributed
 open NeoSmart.Caching.Sqlite
 open RethinkDB.DistributedCache
 
@@ -108,8 +119,9 @@ let rec main args =
     let _ = builder.Services.AddAuthorization ()
     let _ = builder.Services.AddAntiforgery ()
     
-    let sp   = builder.Services.BuildServiceProvider ()
+    let sp = builder.Services.BuildServiceProvider ()
     let data = DataImplementation.get sp
+    let _ = builder.Services.AddSingleton<JsonSerializer> data.Serializer
     
     task {
         do! data.StartUp ()
@@ -121,23 +133,36 @@ let rec main args =
     match data with
     | :? RethinkDbData as rethink ->
         // A RethinkDB connection is designed to work as a singleton
-        builder.Services.AddSingleton<IData> data |> ignore
-        builder.Services.AddDistributedRethinkDBCache (fun opts ->
-            opts.TableName  <- "Session"
-            opts.Connection <- rethink.Conn)
-        |> ignore
+        let _ = builder.Services.AddSingleton<IData> data
+        let _ =
+            builder.Services.AddDistributedRethinkDBCache (fun opts ->
+                opts.TableName  <- "Session"
+                opts.Connection <- rethink.Conn)
+        ()
     | :? SQLiteData as sql ->
         // ADO.NET connections are designed to work as per-request instantiation
         let cfg  = sp.GetRequiredService<IConfiguration> ()
-        builder.Services.AddScoped<SqliteConnection> (fun sp ->
-            let conn = new SqliteConnection (sql.Conn.ConnectionString)
-            SQLiteData.setUpConnection conn |> Async.AwaitTask |> Async.RunSynchronously
-            conn)
-        |> ignore
-        builder.Services.AddScoped<IData, SQLiteData> () |> ignore
+        let _ =
+            builder.Services.AddScoped<SqliteConnection> (fun sp ->
+                let conn = new SqliteConnection (sql.Conn.ConnectionString)
+                SQLiteData.setUpConnection conn |> Async.AwaitTask |> Async.RunSynchronously
+                conn)
+        let _ = builder.Services.AddScoped<IData, SQLiteData> () |> ignore
         // Use SQLite for caching as well
         let cachePath = defaultArg (Option.ofObj (cfg.GetConnectionString "SQLiteCachePath")) "./session.db"
-        builder.Services.AddSqliteCache (fun o -> o.CachePath <- cachePath) |> ignore
+        let _ = builder.Services.AddSqliteCache (fun o -> o.CachePath <- cachePath)
+        ()
+    | :? PostgresData ->
+        // ADO.NET connections are designed to work as per-request instantiation
+        let cfg  = sp.GetRequiredService<IConfiguration> ()
+        let _ =
+            builder.Services.AddScoped<NpgsqlConnection> (fun sp ->
+                new NpgsqlConnection (cfg.GetConnectionString "PostgreSQL"))
+        let _ = builder.Services.AddScoped<IData, PostgresData> ()
+        let _ =
+            builder.Services.AddSingleton<IDistributedCache> (fun sp ->
+                Postgres.DistributedCache (cfg.GetConnectionString "PostgreSQL") :> IDistributedCache)
+        ()
     | _ -> ()
     
     let _ = builder.Services.AddSession(fun opts ->
@@ -159,6 +184,7 @@ let rec main args =
     | Some it when it = "restore"      -> Maintenance.Backup.restoreFromBackup args app.Services
     | Some it when it = "do-restore"   -> Maintenance.Backup.restoreFromBackup args app.Services
     | Some it when it = "upgrade-user" -> Maintenance.upgradeUser              args app.Services
+    | Some it when it = "set-password" -> Maintenance.setPassword              args app.Services
     | Some it when it = "help"         -> showHelp ()
     | Some it ->
         printfn $"""Unrecognized command "{it}" - valid commands are:"""

src/MyWebLog/appsettings.json

@@ -1,5 +1,5 @@
 {
-  "Generator": "myWebLog 2.0-rc1",
+  "Generator": "myWebLog 2.0-rc2",
   "Logging": {
     "LogLevel": {
       "MyWebLog.Handlers": "Information"

src/admin-theme/version.txt

@@ -1,2 +1,2 @@
 myWebLog Admin
-2.0.0-rc1
+2.0.0-rc2

src/default-theme/version.txt

@@ -1,2 +1,2 @@
 myWebLog Default Theme
-2.0.0-rc1
+2.0.0-rc2