### Summary Align go db schema with python --------- Signed-off-by: Jin Hai <haijin.chn@gmail.com>
As title. --------- Signed-off-by: Jin Hai <haijin.chn@gmail.com>
## Summary - Align Langfuse API key set/get/delete behavior with the Python implementation. - Improve DAO handling for Langfuse credential save/delete flows. - Add tests for Langfuse service error handling and API key lifecycle behavior.
### What problem does this PR solve? Model-> entity ### Type of change - [x] Refactoring Signed-off-by: Jin Hai <haijin.chn@gmail.com>
