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## Thinking Path > - Paperclip manages AI agents and their work. > - Muse connects an external worker to a Paperclip agent. > - Its maintenance loop scans the database every five seconds, even without bindings. > - These empty scans prevent an otherwise idle database from sleeping. > - The shared delivery coordinator can react to committed writes and saved deadlines. > - This change uses that coordinator and retains recovery for unfinished assignments. > - Idle Muse maintenance can now stop querying the database. ## Linked Issues or Issue Description **What existing behavior does this improve?** Muse qualification, OAuth authority, and terminal assignment maintenance. **Current behavior** A claimed instance runs two empty scans every five seconds even when Muse has no bindings. This produces about 34,560 unnecessary queries per day. Warm standby suppression from #16974 does not cover claimed instances. **Proposed behavior** Recover once at startup. Wake after relevant transactions settle. Schedule qualification expiry at its saved deadline. Retain five-second recovery only for failures and unfinished assignments. **Reason and benefit** Remove recurring database traffic from idle Muse maintenance while preserving authority checks and recovery. Reuse the database work signal foundation from #15625 without adding tables. ## What Changed - Register Muse maintenance with the shared delivery coordinator and its idle admission rules. - Signal pairing, OAuth attachment and revocation, qualification changes, and new assignments before transaction writes. The existing transaction layer waits for outer commit. - Restore qualification deadlines from persisted bindings. Retry failed sweeps and unfinished assignments. - Add PostgreSQL tests for idle quiet, nested commit, rollback, deadlines, standby, drain, and failure recovery. Verify signals from actual Muse producers. Preserve startup, newly committed work, and failed sweep retries across idle drain without SQL polling. - Document the remaining recovery cadence and sleep limitations. ## Verification - `pnpm -r typecheck`: passed before rebase. Server typechecking also passed after rebase and the drain fix. - `pnpm build`: passed before rebase. - Final change: 33 maintenance, delivery coordinator, and scheduler tests passed. Maintenance used a fresh disposable PostgreSQL 17 database. - Muse control-plane tests: 254 passed against the same disposable database. - `pnpm test:run`: attempted, then stopped after repeated embedded PostgreSQL startup failures from this host's semaphore limit. Native-session, Muse, and AI-connection suites could not create local clusters. The complete suite runs in CI. - `git diff --check`: passed. - Final commit `e106cbf20d`: all CI gates passed, including complete test suites, E2E, build, production bundle boot, public-install smoke test, and canary dry run. Greptile and Paperclip source reviews both rated 5/5, with no unresolved findings. The focused suites accept `PAPERCLIP_MUSE_MAINTENANCE_TEST_DATABASE_URL` and `PAPERCLIP_MUSE_CONTROL_TEST_DATABASE_URL`. Use a disposable test database; fixtures remove test data. ## Risks - Unfinished assignments retain five-second recovery. This change removes idle polling, not all Muse polling. - Signals are process-local. Independent database writers need explicit integration. Startup recovers persisted state. - Qualification deadlines depend on the running process. Existing durable Muse sleep blockers remain unchanged. - The receiver keeps its batching timer. An empty buffer already makes no database calls. - No schema migration or API change. ## Model Used OpenAI Codex, GPT-6 family, with code execution and repository tools. The exact model version is not exposed in this session. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass (focused suites; full local run has the environment limitation above) - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] All Paperclip CI gates are green - [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Paperclip <noreply@paperclip.ing>