Initial import: KeepNote service (dcntrlized-auth consumer)

database/migrations/002_shared_auth.sql

@@ -0,0 +1,19 @@
+\c dcntrlized;
+
+-- Plain-UUID user_id: drop the legacy FK (D5).
+ALTER TABLE IF EXISTS keepnote.notes DROP CONSTRAINT IF EXISTS notes_user_id_fkey;
+
+-- Re-point existing rows to auth.users by username, then drop the old table.
+-- No-op on fresh DBs (the old users table never existed).
+DO $$
+BEGIN
+    IF EXISTS (SELECT FROM pg_catalog.pg_tables WHERE schemaname='keepnote' AND tablename='users')
+       AND EXISTS (SELECT FROM pg_catalog.pg_tables WHERE schemaname='auth'   AND tablename='users') THEN
+        UPDATE keepnote.notes n
+           SET user_id = a.id
+          FROM keepnote.users old
+          JOIN auth.users a ON a.username = old.username
+         WHERE n.user_id = old.id;
+        DROP TABLE keepnote.users;
+    END IF;
+END $$;