diff --git a/CLAUDE.md b/CLAUDE.md
index 4c73bda..0203418 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -44,6 +44,7 @@ The core product principle is: agents publish content, not files. The server own
 - Run the local development server on `127.0.0.1:8001`. Port `8000` may be reserved or blocked on this workstation.
 - Always use this same fixed port for the dev server. Never start a second instance on a different port; if `8001` is already serving, reuse it rather than starting another.
 - All artifact-posting tools (`skills/daybook-posting/scripts/daybook_post.py`, `scripts/seed_demo_artifacts.py`, and any future posting skill) must default `DAYBOOK_URL` to `http://127.0.0.1:8001` to match.
+- A regular (non-superuser) user `test` / password `testpwd` must always exist in the local dev database — it's the permanent account a sibling project (`AGENT_DAYBOOK__LLM_TEST`) uses for API testing. If the local `db.sqlite3` is ever reset, recreate this exact user (e.g. via Settings → Users) before assuming that project is broken.
 - Do not deploy to the Proxmox NUC during routine code iteration.
 - Treat the NUC container as the local live/staging target. Deploy there only at explicit stable checkpoints, such as an end-of-day build.
 - Before any NUC deployment, preserve `/opt/daybook/deploy/.env` and `/opt/daybook/deploy/data`.