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fix(config): reload AppConfig when config path or mtime changes (#1239)

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* fix(config): reload AppConfig when config path or mtime changes

- Track resolved path + mtime; invalidate cache on change
- Preserve set_app_config() injection behavior
- Add regression tests (test_app_config_reload.py)
- Document behavior in README and backend/CLAUDE.md

Signed-off-by: Gao Mingfei <g199209@gmail.com>

* Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Signed-off-by: Gao Mingfei <g199209@gmail.com>
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Gao Mingfei
2026-03-22 20:34:01 +08:00
committed by GitHub
parent e6c6770b70
commit 644501ae07
4 changed files with 146 additions and 10 deletions
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backend/CLAUDE.md
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@@ -172,6 +172,8 @@ Setup: Copy `config.example.yaml` to `config.yaml` in the **project root** direc
**Config Versioning**: `config.example.yaml` has a `config_version` field. On startup, `AppConfig.from_file()` compares user version vs example version and emits a warning if outdated. Missing `config_version` = version 0. Run `make config-upgrade` to auto-merge missing fields. When changing the config schema, bump `config_version` in `config.example.yaml`.
**Config Caching**: `get_app_config()` caches the parsed config, but automatically reloads it when the resolved config path changes or the file's mtime increases. This keeps Gateway and LangGraph reads aligned with `config.yaml` edits without requiring a manual process restart.
Configuration priority:
1. Explicit `config_path` argument
2. `DEER_FLOW_CONFIG_PATH` environment variable