Fix `AttributeError` in `model_response_handler` when processing channel messages with `null` data field. The function iterates over thread messages to build conversation history, but some messages may have `data=None` causing a crash when accessing `thread_message.data.get()`. Added null check using `(thread_message.data or {}).get("files", [])` to safely handle messages without data.
- Add chat_message table for message-level analytics with usage JSON field
- Add migration to backfill from existing chats
- Add /analytics endpoints: summary, models, users, daily
- Support hourly/daily granularity for time-series data
- Fill missing days/hours in date range
fix: remove invalid expunge call on Pydantic FileModel
Files.get_file_by_id() returns a Pydantic FileModel, not an SQLAlchemy
ORM object. Calling db.expunge() on a Pydantic model fails with
UnmappedInstanceError since it lacks _sa_instance_state.
The expunge was also unnecessary because subsequent DB updates already
use fresh sessions via get_db() context manager.
Fixes#20925
Remove Depends(get_session) from POST /query endpoint to prevent database connections from being held during embedding API calls (1-5+ seconds).
The Memories.get_memories_by_user_id() function manages its own short-lived session internally, releasing the connection before the slow EMBEDDING_FUNCTION() call begins.
Remove Depends(get_session) from POST /create endpoint to prevent database connections from being held during embedding API calls (1-5+ seconds).
The has_permission() and Knowledges.insert_new_knowledge() functions manage their own short-lived sessions internally, releasing connections before the slow embed_knowledge_base_metadata() call begins.
Timothy Jaeryang Baek