Br1an d46bbd30f7 Fix: send input and output token usage to Langfuse (#13294) ...

### What problem does this PR solve?

Closes #9837

The Langfuse integration currently only sends the output text to
`langfuse_generation.update()` without including token usage
information. This means Langfuse cannot track input/output token
consumption for cost analysis and monitoring.

### Solution

Add the `usage` parameter to `langfuse_generation.update()` with:
- `input`: approximate input token count from `message_fit_in()`
- `output`: approximate output token count from
`num_tokens_from_string(answer)`
- `total`: sum of input and output

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

2026-05-14 13:11:37 +08:00

..

apps

Fix: dataset document download route (#14910)

2026-05-14 10:59:06 +08:00

common

Feat：admin api (#10642)

2025-10-18 16:09:48 +08:00

db

Fix: send input and output token usage to Langfuse (#13294)

2026-05-14 13:11:37 +08:00

utils

fix: use context manager for pdfplumber to prevent resource leak (#13512)

2026-05-13 21:09:51 +08:00

__init__.py

Fix: incorrect async chat streamly output (#11679)

2025-12-03 11:15:45 +08:00

constants.py

Feat/memory (#11812)

2025-12-10 13:34:08 +08:00

ragflow_server.py

Speed up ragflow server (#14894)

2026-05-13 18:01:33 +08:00

settings.py

Move api.settings to common.settings (#11036)

2025-11-06 09:36:38 +08:00

validation.py

Fix errors detected by Ruff (#3918)

2024-12-08 14:21:12 +08:00