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_docs/02_tests/16_database_layer_integration_spec.md

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+# Integration Test: Database Layer
+
+## Summary
+Validate the Database Layer for storing and retrieving flights, images, results, and system state.
+
+## Component Under Test
+**Component**: GPS Denied Database Layer
+**Location**: `gps_denied_17_gps_denied_database_layer`
+**Dependencies**: PostgreSQL/SQLite database, SQL migrations
+
+## Detailed Description
+Tests that Database Layer can:
+1. Create database schema via migrations
+2. Perform CRUD operations on all entities
+3. Handle transactions atomically
+4. Enforce foreign key constraints
+5. Support concurrent access
+6. Provide efficient queries with indexes
+7. Handle connection pooling
+8. Backup and restore data
+
+## Input Data
+
+### Test Case 1: Schema Creation
+- **Action**: Run database migrations
+- **Expected**: All tables created with correct schema
+
+### Test Case 2: Insert Flight
+- **Data**: New flight record
+- **Expected**: Flight inserted, ID returned
+
+### Test Case 3: Insert Images (Batch)
+- **Data**: 10 image records
+- **Expected**: All inserted in single transaction
+
+### Test Case 4: Insert Results
+- **Data**: GPS result for processed image
+- **Expected**: Result inserted with foreign key to image
+
+### Test Case 5: Query by Flight ID
+- **Query**: Get all images for a flight
+- **Expected**: Returns all images in correct order
+
+### Test Case 6: Update Result (Refinement)
+- **Action**: Update existing result with refined GPS
+- **Expected**: Result updated, version incremented
+
+### Test Case 7: Delete Flight (Cascade)
+- **Action**: Delete flight
+- **Expected**: Associated images and results also deleted
+
+### Test Case 8: Transaction Rollback
+- **Scenario**: Insert flight, insert images, error occurs
+- **Expected**: Transaction rolls back, no partial data
+
+### Test Case 9: Concurrent Writes
+- **Scenario**: 5 simultaneous inserts to different flights
+- **Expected**: All succeed, no deadlocks
+
+### Test Case 10: Query Performance
+- **Query**: Complex join across flights, images, results
+- **Dataset**: 1000 flights, 60,000 images
+- **Expected**: Query completes < 100ms
+
+### Test Case 11: Index Effectiveness
+- **Query**: Find image by ID
+- **Expected**: Uses index, < 1ms lookup
+
+### Test Case 12: Connection Pooling
+- **Scenario**: 100 rapid connections
+- **Expected**: Pool reuses connections, no exhaustion
+
+## Expected Output
+```json
+{
+  "operation": "insert|select|update|delete",
+  "success": true/false,
+  "rows_affected": <integer>,
+  "execution_time_ms": <float>,
+  "error": "string|null"
+}
+```
+
+## Success Criteria
+- All CRUD operations work correctly
+- Transactions atomic (all-or-nothing)
+- Foreign keys enforced
+- Query performance acceptable
+- Connection pooling works
+- No SQL injection vulnerabilities
+
+## Maximum Expected Time
+- Schema migration: < 5 seconds
+- Single insert: < 10ms
+- Batch insert (10): < 100ms
+- Query: < 100ms
+- Total test suite: < 60 seconds
+
+## Pass/Fail Criteria
+**Passes If**: All operations succeed, performance acceptable, data integrity maintained
+**Fails If**: Data corruption, slow queries, deadlocks, constraint violations
+