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## Thinking Path > - Paperclip manages agents and plugin work. > - Plugins can declare cron jobs with saved deadlines. > - The existing scheduler queries for due jobs every 30 seconds, even when none exist. > - Empty queries keep an otherwise idle database active. > - This PR uses the shared scheduler and committed job changes to discover work. > - Existing job and run rows preserve deadlines and execution history. ## Linked Issues or Issue Description **What happened?** The plugin scheduler on the base of this stack runs empty periodic SQL. Its registration path also advances overdue timestamps. An empty replacement manifest can leave removed schedules active. **Expected behavior** No recurring SQL when no eligible jobs exist. Configured jobs wait for their saved deadline. Changes reactivate scheduling after commit. Work remains protected through drain and shutdown. **Steps to reproduce** Start the plugin scheduler with no jobs. After startup, observe queries during a three-minute idle window. The new PostgreSQL regression failed on the baseline and passes with this change. **Paperclip version or commit** Stacked on #17510 at `4d15c08428`. Deployment: source checkout, local PostgreSQL, controlled plugin RPC. Related: #7905 covers empty-manifest sync; this migration requires that behavior on both activation paths. #11571 proposes company-scoped jobs; this PR preserves the existing instance-scoped job contract. ## What Changed - Install the concurrency test barrier before due job notifications can dispatch. - Make dispatch the sole reservation owner and preserve retained or concurrently committed results when unregistering a plugin. - Replace the private interval with the existing shared deadline worker. - Signal job definition and run changes inside their owning transactions. No new tables. - Wake from plugin registration and worker status events. Retain explicit scheduler wakes received during drain. - Preserve overdue work and initialize only missing or changed schedules. - Recheck claims under a job-row lock. Keep plugin calls outside transactions and refill capacity on completion. - Commit completion and schedule advancement together. Retry failed persistence without repeating the plugin side effect. - Track admitted calls through shutdown and synchronize empty manifests. ## Verification This PR now targets master after #17510 merged as `4e27a82a4265c01f3ab4f05aaecc010a0026de75`. The normal landed-parent merge preserves the entire verified `df78ca3b5e` tree byte for byte; only final publication docs change afterwards. The PR still differs in its original seventeen paths and has no database schema or migration change. Primary test revision: `36be0bd73363680d7666d94ff5f1dd28b27f4235`, on parent `ba80060407`. Final integration of parent `51668b8240` preserves all plugin/runtime/shutdown sources from that proof and passes all 63 cases in complete plugin, approval-seeding and scoped-deadline suites at `56ce7c1d2a`, plus server types/build. Only six parent seeding/doc files changed; this is not a rerun of all eleven suites. Only the original seventeen plugin-scheduling paths differ from that parent; all other tracked files, including migration history, match it. - **247 cases pass in eleven complete suites:** plugin scheduler, shutdown, warm standby, plugin environment-driver readiness, delivery coordinator, both retention workers, approval seeding, decision expiry, scoped deadlines and startup. Server typecheck and production build pass. - The new real PostgreSQL lock test failed before the repair: shutdown remained pending while the completion update waited for a held run row. After repair, shutdown reports the statement timeout while the lock remains held; retry after release commits the saved result with exactly one plugin invocation. All 34 scheduler cases pass. - Existing regressions preserve real committed schedule changes, saved deadlines, manual/scheduled reservation, retained success and failure results during unregister, completion/unregister lock order, independent progress, rollback/outer commit, quiet configured states, drain/resume and shutdown cleanup. - The parent's complete seeding/producer run passed 522 cases at its stated revision. Earlier duplicate reservations, overwritten retained results, hourly-clock fixture failures and combined-stack CI/setup failures remain recorded in `doc/idle-plugin-jobs.md`, its dated audit and the stack ledger; they are not erased or recounted as this candidate's tests. - The completion timeout is transaction-local and defaults to thirty seconds per PostgreSQL statement. It does not bound every shutdown/network operation or make plugin side effects safe to replay. No full local repository-suite or deployed host-sleep claim is made. Commands: server Vitest for the eleven suites above; server typecheck/build. Fresh exact-head CI, Greptile and Ponytail reviews remain required before merge. ## Risks - This uses process-local notifications. Independent SQL writers and other replicas need their own wake integration. - A run left unresolved after process loss is not automatically replayed: the external effect may have occurred. Existing lifecycle/operator reconciliation must resolve it. Live-process settlement failures retry without replay. - Job definitions remain instance-scoped. This PR does not implement company-scoped job dispatch. - Cloud's plugin sleep blockers remain. Internal deadlines do not add durable external wake coverage or prove deployed sleep. - The shared deadline helper now retains direct lifecycle wakes through drain; existing coordinator and decision deadline consumers are tested. ## Model Used OpenAI Codex, GPT-6-based agent, with repository tools, code execution, and GitHub access. The exact serving model version and context-window size are 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 - [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 - [ ] All Paperclip CI gates are green - [ ] 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>