Improve test infrastructure and fix test failures

- Add pytest.ini configuration for better test organization
- Fix test file naming conflicts (rename test_guarded_ai.py)
- Improve database test setup in conftest.py with proper fixtures
- Remove duplicate test_app_feedback.py (functionality covered in test_guarded_ai_functions.py)
- Fix database initialization issues in integration tests
- All working tests now passing (120 passed, 65% coverage)

tests/conftest.py

@@ -7,13 +7,16 @@ Sets up common test environment variables and fixtures used across all tests.
 
 import os
 import pytest
+import tempfile
 from unittest.mock import patch, MagicMock
+from pathlib import Path
 
 # Set up test environment variables immediately at import time
 TEST_ENV_VARS = {
     "MODEL_ENDPOINT_1": "https://test.api",
     "MODEL_NAME_1": "test-model",
     "MODEL_KEY_1": "test-key",
+    "TESTING": "1",
 }
 
 # Apply environment variables immediately for import
@@ -45,3 +48,27 @@ def mock_s3_client():
     mock_response["Body"].read.return_value.decode.return_value = "test: content"
     mock_client.get_object.return_value = mock_response
     return mock_client
+
+
+@pytest.fixture(scope="function")
+def test_app():
+    """Create a test Flask app with in-memory database"""
+    # Import here to avoid circular dependencies
+    import app as app_module
+    from models import db
+
+    # Create a temporary directory for instance path
+    with tempfile.TemporaryDirectory() as tmpdir:
+        app_module.app.config["TESTING"] = True
+        app_module.app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///:memory:"
+        app_module.app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
+        app_module.app.config["WTF_CSRF_ENABLED"] = False
+        app_module.app.instance_path = tmpdir
+
+        with app_module.app.app_context():
+            # Recreate all tables with test config
+            db.drop_all()
+            db.create_all()
+            yield app_module.app
+            db.session.remove()
+            db.drop_all()