fix issues

docs/02_components/03_flight_database/flight_database_spec.md

@@ -676,6 +676,13 @@ Optional[Dict]: Metadata dictionary or None
 
 ## Chunk State Operations
 
+**Necessity**: These methods are **required** for crash recovery. Without them:
+- Chunk state would be lost on system restart
+- Processing would need to start from scratch
+- Background chunk matching progress would be lost
+
+F12 Route Chunk Manager delegates persistence to F03 to maintain separation of concerns (F12 manages chunk logic, F03 handles storage).
+
 ### `save_chunk_state(flight_id: str, chunk: ChunkHandle) -> bool`
 
 **Description**: Saves chunk state to database for crash recovery.