sendou.ink/migrations/086-add-weapon-pool-favorites.js

export function up(db) {
	db.transaction(() => {
		const users = db
			.prepare(/* sql */ "SELECT id, qWeaponPool FROM User")
			.all();

		const updateStatement = db.prepare(
			/* sql */ "UPDATE User SET qWeaponPool = ? WHERE id = ?",
		);

		for (const user of users) {
			if (!user.qWeaponPool) continue;

			const pool = JSON.parse(user.qWeaponPool);
			const newPool = pool.map((id) => ({
				weaponSplId: id,
				isFavorite: 0,
			}));

			updateStatement.run(JSON.stringify(newPool), user.id);
		}
	})();
}