fix: reduce TTFT by caching model lookups in chat completion
Skip expensive get_all_models() calls when models are already cached
in app.state. This significantly reduces Time To First Token (TTFT)
for chat completions and embeddings requests.
Previously, every request called get_all_models() which fetches model
lists from all configured backends. Now we check the cache first and
only call get_all_models() on cache miss.
Affected endpoints:
- openai: generate_chat_completion, embeddings
- ollama: embed, embeddings
Fixes#20069
Co-authored-by: Michael <42099345+mickeytheseal@users.noreply.github.com>
Each access to request.app.state.config.<KEY> triggers a synchronous
Redis GET. In get_all_models_responses() and get_merged_models(), the
config keys OPENAI_API_BASE_URLS, OPENAI_API_KEYS, and
OPENAI_API_CONFIGS were read on every loop iteration — resulting
in some cases in 200-300 Redis round-trips for OPENAI_API_BASE_URLS alone.
Read each config value once into a local variable at the start of the
function and reuse it throughout.
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
Timothy Jaeryang Baek