# Feature: Flight & Waypoint CRUD Operations

## Description
Core database infrastructure and CRUD operations for flights, waypoints, and geofences. Provides connection pooling, transaction support, and all primary data operations. This feature handles the main entities that define a flight and its route.

## Component APIs Implemented
- `execute_transaction(operations: List[Callable]) -> bool`
- `insert_flight(flight: Flight) -> str`
- `update_flight(flight: Flight) -> bool`
- `query_flights(filters: Dict[str, Any], limit: int, offset: int) -> List[Flight]`
- `get_flight_by_id(flight_id: str) -> Optional[Flight]`
- `delete_flight(flight_id: str) -> bool`
- `get_waypoints(flight_id: str, limit: Optional[int] = None) -> List[Waypoint]`
- `insert_waypoint(flight_id: str, waypoint: Waypoint) -> str`
- `update_waypoint(flight_id: str, waypoint_id: str, waypoint: Waypoint) -> bool`
- `batch_update_waypoints(flight_id: str, waypoints: List[Waypoint]) -> BatchResult`

## External Tools and Services
- **PostgreSQL**: Primary database
- **SQLAlchemy**: ORM and connection pooling
- **Alembic**: Schema migrations

## Internal Methods
| Method | Purpose |
|--------|---------|
| `_get_connection()` | Acquire connection from pool |
| `_release_connection(conn)` | Return connection to pool |
| `_execute_with_retry(query, params, retries=3)` | Execute query with automatic retry on transient errors |
| `_build_flight_from_row(row)` | Map database row to Flight object |
| `_build_waypoint_from_row(row)` | Map database row to Waypoint object |
| `_serialize_camera_params(params)` | Serialize CameraParameters to JSONB |
| `_deserialize_camera_params(jsonb)` | Deserialize JSONB to CameraParameters |
| `_build_filter_query(filters)` | Build WHERE clause from filter dict |

## Unit Tests
1. **Connection management**
   - Pool returns connections correctly
   - Connection recycling after timeout
   - Health check on stale connections

2. **execute_transaction**
   - All operations succeed → commit
   - One operation fails → rollback all
   - Connection error → retry and succeed
   - Nested transactions handled correctly

3. **insert_flight**
   - Valid flight with 100 waypoints → all persisted
   - Duplicate flight_id → raises IntegrityError
   - Partial failure mid-insert → complete rollback
   - Empty waypoints list → flight created with no waypoints

4. **update_flight**
   - Existing flight → returns True, fields updated
   - Non-existent flight → returns False
   - Only specified fields updated, others unchanged

5. **query_flights**
   - Filter by name → returns matching flights
   - Filter by status → returns matching flights
   - Pagination (offset=100, limit=50) → returns correct slice
   - No matches → returns empty list

6. **get_flight_by_id**
   - Existing flight → returns complete Flight with waypoints
   - Non-existent flight → returns None
   - Large flight (3000 waypoints) → returns within 150ms

7. **delete_flight**
   - Existing flight → returns True, cascade to all tables
   - Non-existent flight → returns False
   - Verify cascade deletes waypoints, geofences, etc.

8. **get_waypoints**
   - All waypoints (limit=None) → returns complete list
   - Limited (limit=100) → returns first 100
   - Non-existent flight → returns empty list

9. **insert_waypoint**
   - Valid insertion → returns waypoint_id
   - Non-existent flight → raises ForeignKeyError

10. **update_waypoint**
    - Existing waypoint → returns True
    - Non-existent waypoint → returns False
    - Concurrent updates → no data corruption

11. **batch_update_waypoints**
    - Batch of 100 → all succeed
    - Partial failure → returns failed_ids
    - Empty batch → returns success with updated_count=0

## Integration Tests
1. **Complete flight lifecycle**
   - insert_flight() → update_waypoint() × 100 → get_flight_by_id() → delete_flight()
   - Verify all data persisted and cascade delete works

2. **High-frequency waypoint updates**
   - Insert flight with 2000 waypoints
   - Concurrent update_waypoint() calls (100/sec)
   - Verify throughput > 200 ops/sec
   - Verify no data corruption

3. **Transaction atomicity**
   - Begin transaction with 5 operations
   - Fail on operation 3
   - Verify operations 1-2 rolled back

4. **Connection pool behavior**
   - Exhaust pool → new requests wait
   - Pool recovery after connection failures
   - Connection reuse efficiency


