fix(ci): use SQLite for E2E tests to match local setup

Use SQLite in-memory database for E2E tests in CI to avoid
SQL dialect incompatibility (INSERT OR REPLACE is SQLite-specific).
This matches the local test setup and simplifies the CI configuration.

Removes the postgres service container as it's no longer needed.

Author: Sakeeb91

.github/workflows/ci.yml

@@ -134,20 +134,6 @@ jobs:
     name: E2E Tests
     runs-on: ubuntu-latest
     needs: [lint, test]
-    services:
-      postgres:
-        image: postgres:15-alpine
-        env:
-          POSTGRES_USER: test_user
-          POSTGRES_PASSWORD: test_password
-          POSTGRES_DB: test_db
-        ports:
-          - 5432:5432
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -177,8 +163,8 @@ jobs:
       - name: Run E2E tests
         env:
           E2E_TESTS_ENABLED: "true"
-          E2E_DATABASE_URL: "postgresql://test_user:test_password@localhost:5432/test_db"
-          DATABASE_URL: "postgresql://test_user:test_password@localhost:5432/test_db"
+          E2E_DATABASE_URL: "sqlite:///:memory:"
+          DATABASE_URL: "sqlite:///:memory:"
           SECRET_KEY: "e2e-test-secret-key"
           AUTH_ENABLED: "true"
           JWT_AUTH_ENABLED: "true"
@@ -193,8 +179,8 @@ jobs:
       - name: Run E2E performance tests
         env:
           E2E_TESTS_ENABLED: "true"
-          E2E_DATABASE_URL: "postgresql://test_user:test_password@localhost:5432/test_db"
-          DATABASE_URL: "postgresql://test_user:test_password@localhost:5432/test_db"
+          E2E_DATABASE_URL: "sqlite:///:memory:"
+          DATABASE_URL: "sqlite:///:memory:"
           SECRET_KEY: "e2e-test-secret-key"
           AUTH_ENABLED: "true"
           API_KEY_AUTH_ENABLED: "true"