lint: fix biome issues in new test files and helpers

src/test/fake-db.ts

@@ -44,10 +44,12 @@ function makeQuery(
 	]) {
 		query[method] = self;
 	}
+	// biome-ignore lint/suspicious/noThenProperty: intentional thenable for await support
 	query.then = (
 		onFulfilled: (value: unknown) => unknown,
 		onRejected: (error: unknown) => unknown,
-	) => Promise.resolve(resolve(table, projection)).then(onFulfilled, onRejected);
+	) =>
+		Promise.resolve(resolve(table, projection)).then(onFulfilled, onRejected);
 	query.catch = (onRejected: (error: unknown) => unknown) =>
 		Promise.resolve(resolve(table, projection)).catch(onRejected);
 	return query;