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## Thinking Path > - Paperclip runs AI agent heartbeats to manage work; each heartbeat dispatches `executeRun` fire-and-forget, which is intentional for concurrency > - The server escalation test suite (`heartbeat-issue-liveness-escalation.test.ts`) exercises `reconcileIssueGraphLiveness`, which heals a resolved-dependency wake by enqueuing an on-demand heartbeat run > - `enqueueWakeup` → `startNextQueuedRunForAgent` dispatches the run fire-and-forget (`void executeRun(...)`), so the background run outlives the awaited reconcile call > - The test's `afterEach` polled `heartbeat_runs.status` to wait for idle, but that flips to `completed` while `executeRun`'s finally block is still flushing events — the escaping `heartbeat_run_events` insert could land between the events delete and the runs delete, tripping the FK constraint > - This PR fixes the race deterministically by tracking in-flight `executeRun` promises and exposing `heartbeatService.drainActiveRunExecutions()`, which the suite awaits before clearing tables > - The benefit is a permanently reliable escalation test suite with no sleeps, no retry bumps, and no production behavior change ## Linked Issues or Issue Description **What happened?** The `heartbeat-issue-liveness-escalation.test.ts` suite intermittently failed in CI with: ``` delete on table "heartbeat_runs" violates foreign key constraint "heartbeat_run_events_run_id_heartbeat_runs_id_fk" ``` **Expected behavior** `afterEach` cleanup should complete without FK violations. **Steps to reproduce** The race is timing-dependent but surfaces reliably when the teardown window is artificially widened. `reconcileIssueGraphLiveness()` heals resolved-dependency wakes by dispatching a heartbeat run fire-and-forget (`void executeRun(...)`). The old `afterEach` polled `heartbeat_runs.status` — but that flips to `completed` while `executeRun`'s finally block still has pending `heartbeat_run_events` row writes. The escaping insert can land between the events delete and the runs delete. **Paperclip version or commit** Reproducible on current `master` (commit `b57aa9950c707a024156c34b79326a82b2dcca31`) ## What Changed - **`server/src/services/heartbeat.ts`** — tracks all in-flight `executeRun` promises in a module-level `Set`; exposes `heartbeatService(db).drainActiveRunExecutions()`, which loops until the set drains (a completing run can enqueue the next queued run in its finally, so a single `await` is not enough) - **`server/src/server-suites/heartbeat-issue-liveness-escalation.test.ts`** — replaces the poll-on-`heartbeat_runs.status` teardown with `await heartbeatService(db).drainActiveRunExecutions()` before clearing tables; removes the now-unnecessary `waitForHeartbeatRunToComplete` helper ## Verification ```bash # Full file (22 tests) npx vitest run server/src/server-suites/heartbeat-issue-liveness-escalation.test.ts # 12x stress loop (264 test-runs, 0 failures) for i in $(seq 1 12); do npx vitest run server/src/server-suites/heartbeat-issue-liveness-escalation.test.ts || break done # Type check the changed files npx tsc --noEmit ``` - 22/22 tests green locally - 12/12 full-file loop iterations: 264 test-runs / 264 afterEach cycles, 0 failures - Widened-teardown stress variant (failed deterministically before the fix) now passes with the drain ## Risks Low risk. The drain mechanism is additive — it only affects test teardown and could also be wired into graceful shutdown. The fire-and-forget dispatch in production is unchanged. The `Set`-based tracking adds negligible overhead per run dispatch (insert on dispatch, delete on completion). ## Model Used - **Provider:** Anthropic - **Model:** Claude Sonnet 4.6 (`claude-sonnet-4-6`) - **Context window:** 200K tokens - **Mode:** Tool use, code execution, extended reasoning ## 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 - [ ] 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: Harold Kim <harold@paperclip.ing> Co-authored-by: Paperclip <noreply@paperclip.ing>