fixing rag

backend/tests/integration/api/test_analytics_endpoints.py

@@ -0,0 +1,715 @@
+#!/usr/bin/env python3
+"""
+Analytics API Endpoints Tests - Phase 2 API Coverage
+Priority: app/api/v1/analytics.py
+
+Tests comprehensive analytics API functionality:
+- Usage metrics retrieval
+- Cost analysis and trends
+- System health monitoring
+- Endpoint statistics
+- Admin vs user access control
+- Error handling and validation
+"""
+
+import pytest
+import json
+from datetime import datetime, timedelta
+from unittest.mock import Mock, patch, AsyncMock, MagicMock
+from httpx import AsyncClient
+from fastapi import status
+from app.main import app
+from app.models.user import User
+from app.models.usage_tracking import UsageTracking
+
+
+class TestAnalyticsEndpoints:
+    """Comprehensive test suite for Analytics API endpoints"""
+    
+    @pytest.fixture
+    async def client(self):
+        """Create test HTTP client"""
+        async with AsyncClient(app=app, base_url="http://test") as ac:
+            yield ac
+    
+    @pytest.fixture
+    def auth_headers(self):
+        """Authentication headers for test user"""
+        return {"Authorization": "Bearer test_access_token"}
+    
+    @pytest.fixture
+    def admin_headers(self):
+        """Authentication headers for admin user"""
+        return {"Authorization": "Bearer admin_access_token"}
+    
+    @pytest.fixture
+    def mock_user(self):
+        """Mock regular user"""
+        return {
+            'id': 1,
+            'username': 'testuser',
+            'email': 'test@example.com',
+            'is_active': True,
+            'role': 'user',
+            'is_superuser': False
+        }
+    
+    @pytest.fixture
+    def mock_admin_user(self):
+        """Mock admin user"""
+        return {
+            'id': 2,
+            'username': 'admin',
+            'email': 'admin@example.com',
+            'is_active': True,
+            'role': 'admin',
+            'is_superuser': True
+        }
+    
+    @pytest.fixture
+    def sample_metrics(self):
+        """Sample usage metrics data"""
+        return {
+            'total_requests': 150,
+            'total_cost_cents': 2500,  # $25.00
+            'avg_response_time': 250.5,
+            'error_rate': 0.02,  # 2%
+            'budget_usage_percentage': 15.5,
+            'tokens_used': 50000,
+            'unique_users': 5,
+            'top_models': ['gpt-3.5-turbo', 'gpt-4'],
+            'period_start': '2024-01-01T00:00:00Z',
+            'period_end': '2024-01-01T23:59:59Z'
+        }
+    
+    @pytest.fixture
+    def sample_health_data(self):
+        """Sample system health data"""
+        return {
+            'status': 'healthy',
+            'score': 95,
+            'database_status': 'connected',
+            'qdrant_status': 'connected',
+            'redis_status': 'connected',
+            'llm_service_status': 'operational',
+            'uptime_seconds': 86400,
+            'memory_usage_percent': 45.2,
+            'cpu_usage_percent': 12.8
+        }
+
+    # === USAGE METRICS TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_usage_metrics_success(self, client, auth_headers, mock_user, sample_metrics):
+        """Test successful usage metrics retrieval"""
+        from app.main import app
+        from app.core.security import get_current_user
+        from app.db.database import get_db
+        
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_usage_metrics = AsyncMock(return_value=Mock(**sample_metrics))
+        
+        # Override app dependencies
+        app.dependency_overrides[get_current_user] = lambda: mock_user
+        app.dependency_overrides[get_db] = lambda: AsyncMock()
+        
+        try:
+            with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/metrics?hours=24",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                assert data["period_hours"] == 24
+                
+                # Verify service was called with correct parameters
+                mock_analytics_service.get_usage_metrics.assert_called_once_with(
+                    hours=24, 
+                    user_id=mock_user['id']
+                )
+        finally:
+            # Clean up dependency overrides
+            app.dependency_overrides.clear()
+    
+    @pytest.mark.asyncio
+    async def test_get_usage_metrics_custom_period(self, client, auth_headers, mock_user):
+        """Test usage metrics with custom time period"""
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_usage_metrics = AsyncMock(return_value=Mock())
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/metrics?hours=168",  # 7 days
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                assert data["period_hours"] == 168
+    
+    @pytest.mark.asyncio
+    async def test_get_usage_metrics_invalid_hours(self, client, auth_headers, mock_user):
+        """Test usage metrics with invalid hours parameter"""
+        test_cases = [
+            {"hours": 0, "description": "zero hours"},
+            {"hours": -5, "description": "negative hours"},
+            {"hours": 200, "description": "too many hours (>168)"}
+        ]
+        
+        for case in test_cases:
+            response = await client.get(
+                f"/api/v1/analytics/metrics?hours={case['hours']}",
+                headers=auth_headers
+            )
+            
+            assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY
+    
+    @pytest.mark.asyncio
+    async def test_get_usage_metrics_unauthorized(self, client):
+        """Test usage metrics without authentication"""
+        response = await client.get("/api/v1/analytics/metrics")
+        
+        assert response.status_code == status.HTTP_401_UNAUTHORIZED
+
+    # === SYSTEM METRICS TESTS (ADMIN ONLY) ===
+    
+    @pytest.mark.asyncio
+    async def test_get_system_metrics_admin_success(self, client, admin_headers, mock_admin_user, sample_metrics):
+        """Test successful system metrics retrieval by admin"""
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_usage_metrics = AsyncMock(return_value=Mock(**sample_metrics))
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_admin_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/metrics/system?hours=48",
+                    headers=admin_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                assert data["period_hours"] == 48
+                
+                # Verify service was called without user_id (system-wide)
+                mock_analytics_service.get_usage_metrics.assert_called_once_with(hours=48)
+    
+    @pytest.mark.asyncio
+    async def test_get_system_metrics_non_admin_denied(self, client, auth_headers, mock_user):
+        """Test system metrics access denied for non-admin users"""
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            response = await client.get(
+                "/api/v1/analytics/metrics/system",
+                headers=auth_headers
+            )
+            
+            assert response.status_code == status.HTTP_403_FORBIDDEN
+            data = response.json()
+            assert "admin access required" in data["detail"].lower()
+
+    # === SYSTEM HEALTH TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_system_health_success(self, client, auth_headers, mock_user, sample_health_data):
+        """Test successful system health retrieval"""
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_system_health = AsyncMock(return_value=Mock(**sample_health_data))
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/health",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                
+                # Verify service was called
+                mock_analytics_service.get_system_health.assert_called_once()
+    
+    @pytest.mark.asyncio
+    async def test_get_system_health_service_error(self, client, auth_headers, mock_user):
+        """Test system health with service error"""
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_system_health = AsyncMock(
+            side_effect=Exception("Service connection failed")
+        )
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/health",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
+                data = response.json()
+                assert "connection failed" in data["detail"].lower()
+
+    # === COST ANALYSIS TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_cost_analysis_success(self, client, auth_headers, mock_user):
+        """Test successful cost analysis retrieval"""
+        cost_analysis_data = {
+            'total_cost_cents': 5000,  # $50.00
+            'daily_costs': [
+                {'date': '2024-01-01', 'cost_cents': 1000},
+                {'date': '2024-01-02', 'cost_cents': 1500},
+                {'date': '2024-01-03', 'cost_cents': 2500}
+            ],
+            'cost_by_model': {
+                'gpt-3.5-turbo': 2000,
+                'gpt-4': 3000
+            },
+            'projected_monthly_cost': 15000,  # $150.00
+            'period_days': 30
+        }
+        
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_cost_analysis = AsyncMock(return_value=Mock(**cost_analysis_data))
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/costs?days=30",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                assert data["period_days"] == 30
+                
+                # Verify service was called with correct parameters
+                mock_analytics_service.get_cost_analysis.assert_called_once_with(
+                    days=30,
+                    user_id=mock_user['id']
+                )
+    
+    @pytest.mark.asyncio
+    async def test_get_system_cost_analysis_admin(self, client, admin_headers, mock_admin_user):
+        """Test system-wide cost analysis by admin"""
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_cost_analysis = AsyncMock(return_value=Mock())
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_admin_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/costs/system?days=7",
+                    headers=admin_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                
+                # Verify service was called without user_id (system-wide)
+                mock_analytics_service.get_cost_analysis.assert_called_once_with(days=7)
+
+    # === ENDPOINT STATISTICS TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_endpoint_stats_success(self, client, auth_headers, mock_user):
+        """Test successful endpoint statistics retrieval"""
+        endpoint_stats = {
+            '/api/v1/llm/chat/completions': 150,
+            '/api/v1/rag/search': 75,
+            '/api/v1/budgets': 25
+        }
+        
+        status_codes = {
+            200: 220,
+            400: 20,
+            401: 5,
+            500: 5
+        }
+        
+        model_stats = {
+            'gpt-3.5-turbo': 100,
+            'gpt-4': 50
+        }
+        
+        mock_analytics_service = Mock()
+        mock_analytics_service.endpoint_stats = endpoint_stats
+        mock_analytics_service.status_codes = status_codes
+        mock_analytics_service.model_stats = model_stats
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/endpoints",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                assert "endpoint_stats" in data["data"]
+                assert "status_codes" in data["data"]
+                assert "model_stats" in data["data"]
+
+    # === USAGE TRENDS TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_usage_trends_success(self, client, auth_headers, mock_user):
+        """Test successful usage trends retrieval"""
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                # Mock database query results
+                mock_usage_data = [
+                    (datetime(2024, 1, 1).date(), 50, 5000, 500),  # date, requests, tokens, cost_cents
+                    (datetime(2024, 1, 2).date(), 75, 7500, 750),
+                    (datetime(2024, 1, 3).date(), 60, 6000, 600)
+                ]
+                
+                mock_session.query.return_value.filter.return_value.group_by.return_value.order_by.return_value.all.return_value = mock_usage_data
+                
+                response = await client.get(
+                    "/api/v1/analytics/usage-trends?days=7",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                assert "trends" in data["data"]
+                assert data["data"]["period_days"] == 7
+                assert len(data["data"]["trends"]) == 3
+                
+                # Verify trend data structure
+                first_trend = data["data"]["trends"][0]
+                assert "date" in first_trend
+                assert "requests" in first_trend
+                assert "tokens" in first_trend
+                assert "cost_cents" in first_trend
+                assert "cost_dollars" in first_trend
+
+    # === ANALYTICS OVERVIEW TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_analytics_overview_success(self, client, auth_headers, mock_user):
+        """Test successful analytics overview retrieval"""
+        mock_metrics = Mock(
+            total_requests=100,
+            total_cost_cents=2000,
+            avg_response_time=150.5,
+            error_rate=0.01,
+            budget_usage_percentage=20.5
+        )
+        
+        mock_health = Mock(
+            status='healthy',
+            score=98
+        )
+        
+        mock_analytics_service = Mock()
+        mock_analytics_service.get_usage_metrics = AsyncMock(return_value=mock_metrics)
+        mock_analytics_service.get_system_health = AsyncMock(return_value=mock_health)
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                    mock_get_analytics.return_value = mock_analytics_service
+                
+                response = await client.get(
+                    "/api/v1/analytics/overview",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                
+                overview = data["data"]
+                assert overview["total_requests"] == 100
+                assert overview["total_cost_dollars"] == 20.0  # 2000 cents = $20
+                assert overview["avg_response_time"] == 150.5
+                assert overview["error_rate"] == 0.01
+                assert overview["budget_usage_percentage"] == 20.5
+                assert overview["system_health"] == "healthy"
+                assert overview["health_score"] == 98
+
+    # === MODULE ANALYTICS TESTS ===
+    
+    @pytest.mark.asyncio
+    async def test_get_module_analytics_success(self, client, auth_headers, mock_user):
+        """Test successful module analytics retrieval"""
+        mock_modules = {
+            'chatbot': Mock(initialized=True),
+            'rag': Mock(initialized=True),
+            'cache': Mock(initialized=False)
+        }
+        
+        # Mock module with get_stats method
+        mock_chatbot_stats = {'requests': 150, 'conversations': 25}
+        mock_modules['chatbot'].get_stats = Mock(return_value=mock_chatbot_stats)
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.module_manager') as mock_module_manager:
+                    mock_module_manager.modules = mock_modules
+                
+                response = await client.get(
+                    "/api/v1/analytics/modules",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                assert "data" in data
+                assert "modules" in data["data"]
+                assert data["data"]["total_modules"] == 3
+                
+                # Find chatbot module in results
+                chatbot_module = None
+                for module in data["data"]["modules"]:
+                    if module["name"] == "chatbot":
+                        chatbot_module = module
+                        break
+                
+                assert chatbot_module is not None
+                assert chatbot_module["initialized"] is True
+                assert chatbot_module["requests"] == 150
+    
+    @pytest.mark.asyncio
+    async def test_get_module_analytics_with_errors(self, client, auth_headers, mock_user):
+        """Test module analytics with some modules having errors"""
+        mock_modules = {
+            'working_module': Mock(initialized=True),
+            'broken_module': Mock(initialized=True)
+        }
+        
+        # Mock working module
+        mock_modules['working_module'].get_stats = Mock(return_value={'status': 'ok'})
+        
+        # Mock broken module that throws error
+        mock_modules['broken_module'].get_stats = Mock(side_effect=Exception("Module error"))
+        
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = AsyncMock()
+                mock_get_db.return_value = mock_session
+                
+                with patch('app.api.v1.analytics.module_manager') as mock_module_manager:
+                    mock_module_manager.modules = mock_modules
+                
+                response = await client.get(
+                    "/api/v1/analytics/modules",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_200_OK
+                data = response.json()
+                
+                assert data["success"] is True
+                
+                # Find broken module in results
+                broken_module = None
+                for module in data["data"]["modules"]:
+                    if module["name"] == "broken_module":
+                        broken_module = module
+                        break
+                
+                assert broken_module is not None
+                assert "error" in broken_module
+                assert "Module error" in broken_module["error"]
+
+    # === ERROR HANDLING AND EDGE CASES ===
+    
+    @pytest.mark.asyncio
+    async def test_analytics_service_unavailable(self, client, auth_headers, mock_user):
+        """Test handling of analytics service unavailability"""
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_analytics_service') as mock_get_analytics:
+                mock_get_analytics.side_effect = Exception("Analytics service unavailable")
+                
+                response = await client.get(
+                    "/api/v1/analytics/metrics",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
+                data = response.json()
+                assert "unavailable" in data["detail"].lower()
+    
+    @pytest.mark.asyncio
+    async def test_database_connection_error(self, client, auth_headers, mock_user):
+        """Test handling of database connection errors in trends"""
+        with patch('app.api.v1.analytics.get_current_user') as mock_get_user:
+            mock_get_user.return_value = mock_user
+            
+            with patch('app.api.v1.analytics.get_db') as mock_get_db:
+                mock_session = Mock()
+                mock_get_db.return_value = mock_session
+                
+                # Mock database connection error
+                mock_session.query.side_effect = Exception("Database connection failed")
+                
+                response = await client.get(
+                    "/api/v1/analytics/usage-trends",
+                    headers=auth_headers
+                )
+                
+                assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
+                data = response.json()
+                assert "connection failed" in data["detail"].lower()
+    
+    @pytest.mark.asyncio
+    async def test_cost_analysis_invalid_period(self, client, auth_headers, mock_user):
+        """Test cost analysis with invalid period"""
+        invalid_periods = [0, -5, 400]  # 0, negative, > 365
+        
+        for days in invalid_periods:
+            response = await client.get(
+                f"/api/v1/analytics/costs?days={days}",
+                headers=auth_headers
+            )
+            
+            assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY
+
+
+"""
+COVERAGE ANALYSIS FOR ANALYTICS API ENDPOINTS:
+
+✅ Usage Metrics (4+ tests):
+- Successful metrics retrieval for user
+- Custom time period handling
+- Invalid parameters validation
+- Unauthorized access handling
+
+✅ System Metrics - Admin Only (2+ tests):
+- Admin access to system-wide metrics
+- Non-admin access denial
+
+✅ System Health (2+ tests):
+- Successful health status retrieval
+- Service error handling
+
+✅ Cost Analysis (2+ tests):
+- User cost analysis retrieval
+- System-wide cost analysis (admin)
+
+✅ Endpoint Statistics (1+ test):
+- Endpoint usage statistics retrieval
+
+✅ Usage Trends (1+ test):
+- Daily usage trends from database
+
+✅ Analytics Overview (1+ test):
+- Combined metrics and health overview
+
+✅ Module Analytics (2+ tests):
+- Module statistics with working modules
+- Module error handling
+
+✅ Error Handling (3+ tests):
+- Analytics service unavailability
+- Database connection errors
+- Invalid parameter handling
+
+ESTIMATED COVERAGE IMPROVEMENT:
+- Test Count: 18+ comprehensive API tests
+- Business Impact: Medium-High (monitoring and insights)
+- Implementation: Complete analytics API flow validation
+- Phase 2 Completion: All major API endpoints now tested
+"""