Feat/test

[nafiuishaaq]

Done

What changed

• Added prisma-test-helpers.ts

  • createTestPrismaClient()
  • cleanupDatabase(prisma)
  • resetTestDatabase(prisma, seedFn?)
  • withDatabaseCleanup(fn)

• Added prisma-test-helpers.spec.ts

  • demonstrates seeded data reset between tests
  • verifies created records are cleaned after each test
  • uses TEST_DATABASE_URL / DATABASE_URL for database-backed test execution

• Stabilized a flaky test in api.spec.ts

  • removed strict timing assertions
  • now verifies correct analytics and cache hit behavior instead of wall-clock performance

• Updated README.md

  • added note about TEST_DATABASE_URL
  • referenced the new DB fixture helpers

Why this meets acceptance

• Created records are cleaned after tests via cleanupDatabase
• Seeded fixture state is reset between suites through resetTestDatabase
• Helper utilities now directly support cleanup and reset
• Flaky time-sensitive tests were audited and refactored for stability

Made changes.

Closes #613
closes #615

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