chore: initial public commit

db/migrations/old/20250603_switch_to_release_ids.sql

@@ -0,0 +1,87 @@
+-- +goose Up
+-- +goose StatementBegin
+
+-- Step 1: Create new releases table with surrogate ID
+DROP TABLE releases;
+CREATE TABLE releases (
+    id INT NOT NULL GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    musicbrainz_id UUID UNIQUE,
+    release_group_id INT REFERENCES release_groups(id) ON DELETE SET NULL,
+    title TEXT NOT NULL
+);
+
+-- Step 2: Create artist_releases (replaces artist_release_groups)
+CREATE TABLE artist_releases (
+    artist_id INT REFERENCES artists(id) ON DELETE CASCADE,
+    release_id INT REFERENCES releases(id) ON DELETE CASCADE,
+    PRIMARY KEY (artist_id, release_id)
+);
+
+-- Step 3: Populate releases with one release per release_group
+INSERT INTO releases (musicbrainz_id, release_group_id, title)
+SELECT musicbrainz_id, id AS release_group_id, title
+FROM release_groups;
+
+-- Step 4: Add release_id to tracks temporarily
+ALTER TABLE tracks ADD COLUMN release_id INT;
+
+-- Step 5: Fill release_id in tracks from the newly inserted releases
+UPDATE tracks
+SET release_id = releases.id
+FROM releases
+WHERE tracks.release_group_id = releases.release_group_id;
+
+-- Step 6: Set release_id to NOT NULL now that it's populated
+ALTER TABLE tracks ALTER COLUMN release_id SET NOT NULL;
+
+-- Step 7: Drop old FK and column for release_group_id
+ALTER TABLE tracks DROP CONSTRAINT tracks_release_group_id_fkey;
+ALTER TABLE tracks DROP COLUMN release_group_id;
+
+-- Step 8: Drop old artist_release_groups and migrate to artist_releases
+INSERT INTO artist_releases (artist_id, release_id)
+SELECT arg.artist_id, r.id
+FROM artist_release_groups arg
+JOIN releases r ON arg.release_group_id = r.release_group_id;
+
+DROP TABLE artist_release_groups;
+
+-- Step 9: Add indexes for new relations
+CREATE INDEX idx_tracks_release_id ON tracks(release_id);
+CREATE INDEX idx_artist_releases ON artist_releases(artist_id, release_id);
+
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+
+-- Rollback: Recreate artist_release_groups
+CREATE TABLE artist_release_groups (
+    artist_id INT REFERENCES artists(id) ON DELETE CASCADE,
+    release_group_id INT REFERENCES release_groups(id) ON DELETE CASCADE,
+    PRIMARY KEY (artist_id, release_group_id)
+);
+
+-- Recreate release_group_id in tracks
+ALTER TABLE tracks ADD COLUMN release_group_id INT;
+
+-- Restore release_group_id values
+UPDATE tracks
+SET release_group_id = r.release_group_id
+FROM releases r
+WHERE tracks.release_id = r.id;
+
+-- Restore artist_release_groups values
+INSERT INTO artist_release_groups (artist_id, release_group_id)
+SELECT ar.artist_id, r.release_group_id
+FROM artist_releases ar
+JOIN releases r ON ar.release_id = r.id;
+
+-- Drop new tables and columns
+ALTER TABLE tracks DROP COLUMN release_id;
+DROP INDEX IF EXISTS idx_tracks_release_id;
+DROP INDEX IF EXISTS idx_artist_releases;
+DROP TABLE artist_releases;
+DROP TABLE releases;
+
+-- +goose StatementEnd