feat: add tests and test_questions schema

Made-with: Cursor

src/db/schema/index.ts

@@ -2,3 +2,5 @@ export * from './enums.js';
 export * from './users.js';
 export * from './sessions.js';
 export * from './subscriptions.js';
+export * from './tests.js';
+export * from './testQuestions.js';