Captures the DDL effects of scripts/add-favorites-system.js (a historical
no-go-zone script) so a fresh Neon branch onboarded via npm run setup-db
has the same user_favorites table + 4 indexes that prod has via the
historical script. Brings fresh envs to parity with prod for the
favorites surface used by pages/api/favorites.js.
Shape matches the historical script and the runtime API verbatim:
- user_favorites(id, user_id FK CASCADE, item_type VARCHAR(50),
item_id INTEGER, created_at, UNIQUE(user_id, item_type, item_id))
- idx_user_favorites_user_id / _item_type / _item_id / _user_type
CREATE TABLE / CREATE INDEX guarded with IF NOT EXISTS per convoy
decision D2 — re-running against any env where the historical script
already ran is a documented no-op (only the pgmigrations row is new).
down() is a hard stub: rolling back would drop user_favorites and every
row in it; removal deserves its own scoped convoy.
Part of .convoys/reconcile-historical-add-scripts (commit 22ebef2),
Brief 4 of 7. Base PR is main, not the parent convoy branch, per the
parallel-implementer dispatch pattern.
Co-authored-by: Cursor <cursoragent@cursor.com>
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