BREAKING migrate note favorites to clips

The following endpoints are removed:
- `api/i/favorites`
- `api/notes/favorites/create`
- `api/notes/favorites/delete`
The following endpoints are changed:
- `api/notes/state`
- `api/users/stats`

closes FoundKeyGang/FoundKey#374

Changelog: Removed

packages/backend/migration/1685126322423-remove-favourites.js

@@ -0,0 +1,33 @@
+export class removeFavourites1685126322423 {
+	name = 'removeFavourites1685126322423';
+
+	async up(queryRunner) {
+		await queryRunner.query(`
+			WITH "new_clips" AS (
+				INSERT INTO "clip" ("id", "createdAt", "userId", "name")
+				SELECT
+					RIGHT(GEN_RANDOM_UUID()::text, 10),
+					NOW(),
+					"userId",
+					'⭐'
+				FROM "note_favorite"
+				GROUP BY "userId"
+				RETURNING "id", "userId"
+			)
+			INSERT INTO "clip_note" ("id", "noteId", "clipId")
+			SELECT
+				"note_favorite"."id",
+				"noteId",
+				"new_clips"."id"
+			FROM "note_favorite"
+			JOIN "new_clips" ON "note_favorite"."userId" = "new_clips"."userId"
+		`);
+		await queryRunner.query(`DROP TABLE "note_favorite"`);
+	}
+
+	async down(queryRunner) {
+		// can't revert the migration to clips, can only recreate the database table
+		await queryRunner.query(`CREATE TABLE "note_favorite" ("id" character varying(32) NOT NULL, "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL, "userId" character varying(32) NOT NULL, "noteId" character varying(32) NOT NULL, CONSTRAINT "PK_af0da35a60b9fa4463a62082b36" PRIMARY KEY ("id"))`);
+	}
+}
+