Add job listing table (#15)

also:
- Add source to success story
- Move all IDs to one source file
- Update DbContext with all of the above

src/database/16-job-listing.sql

@@ -0,0 +1,56 @@
+
+-- Add job listing table
+
+CREATE TABLE jjj.job_listing (
+  id           VARCHAR(12)  NOT NULL,
+  citizen_id   VARCHAR(12)  NOT NULL,
+  created_on   TIMESTAMP    NOT NULL,
+  title        VARCHAR(100) NOT NULL,
+  continent_id VARCHAR(12)  NOT NULL,
+  region       VARCHAR(255) NOT NULL,
+  remote_work  BOOLEAN      NOT NULL,
+  expired      BOOLEAN      NOT NULL,
+  updated_on   TIMESTAMP    NOT NULL,
+  listing      TEXT         NOT NULL,
+  needed_by    DATE,
+  filled_here  BOOLEAN,
+  CONSTRAINT pk_job_listing       PRIMARY KEY (id),
+  CONSTRAINT fk_listing_citizen   FOREIGN KEY (citizen_id)   REFERENCES jjj.citizen   (id),
+  CONSTRAINT fk_listing_continent FOREIGN KEY (continent_id) REFERENCES jjj.continent (id)
+);
+
+COMMENT ON TABLE jjj.job_listing IS 'Job Listings';
+COMMENT ON COLUMN jjj.job_listing.id
+  IS 'A unique identifier for a job listing';
+COMMENT ON COLUMN jjj.job_listing.created_on
+  IS 'The date/time a job listing was created';
+COMMENT ON COLUMN jjj.job_listing.title
+  IS 'The title of the job listing';
+COMMENT ON COLUMN jjj.job_listing.continent_id
+  IS 'The ID of the continent on which this job is based';
+COMMENT ON COLUMN jjj.job_listing.region
+  IS 'The region in which this job is based';
+COMMENT ON COLUMN jjj.job_listing.remote_work
+  IS 'Whether this job is a remote job';
+COMMENT ON COLUMN jjj.job_listing.expired
+  IS 'Whether this listing is expired';
+COMMENT ON COLUMN jjj.job_listing.updated_on
+  IS 'The date/time this job listing was last updated';
+COMMENT ON COLUMN jjj.job_listing.listing
+  IS 'The text of the job listing';
+COMMENT ON COLUMN jjj.job_listing.needed_by
+  IS 'The date by which this job needs to be filled';
+COMMENT ON COLUMN jjj.job_listing.filled_here
+  IS 'Whether this job listing was filled because it appeared here';
+
+CREATE INDEX idx_listing_citizen   ON jjj.job_listing (citizen_id);
+CREATE INDEX idx_listing_continent ON jjj.job_listing (continent_id);
+COMMENT ON INDEX jjj.idx_listing_citizen   IS 'FK index';
+COMMENT ON INDEX jjj.idx_listing_continent IS 'FK index';
+
+-- Add source column to success story
+
+ALTER TABLE jjj.success ADD COLUMN source VARCHAR(7) NOT NULL DEFAULT 'profile';
+ALTER TABLE jjj.success ADD CONSTRAINT ck_source CHECK (source IN ('profile', 'listing'));
+COMMENT ON COLUMN jjj.success.source
+  IS 'The source of the success story (profile or listing)';