Fix heartbeat suppression test cleanup race

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/heartbeat-worktree-suppression.test.ts

@@ -36,19 +36,36 @@ describeEmbeddedPostgres("heartbeat worktree suppression", () => {
   let db!: ReturnType<typeof createDb>;
   let tempDb: Awaited<ReturnType<typeof startEmbeddedPostgresTestDatabase>> | null = null;
 
+  function isHeartbeatRunEventFkError(error: unknown) {
+    const message = error instanceof Error ? `${error.message} ${String(error.cause ?? "")}` : String(error);
+    return message.includes("heartbeat_run_events_run_id_heartbeat_runs_id_fk");
+  }
+
+  async function deleteHeartbeatRunsWithEvents() {
+    for (let attempt = 0; attempt < 5; attempt += 1) {
+      await db.delete(heartbeatRunEvents);
+      try {
+        await db.delete(heartbeatRuns);
+        return;
+      } catch (error) {
+        if (!isHeartbeatRunEventFkError(error) || attempt === 4) throw error;
+        await new Promise((resolve) => setTimeout(resolve, 25));
+      }
+    }
+  }
+
   beforeAll(async () => {
     tempDb = await startEmbeddedPostgresTestDatabase("heartbeat-worktree-suppression-");
     db = createDb(tempDb.connectionString);
   }, 20_000);
 
   afterEach(async () => {
-    await db.delete(heartbeatRunEvents);
     await db.delete(issueComments);
     await db.delete(issueDocuments);
     await db.delete(documentRevisions);
     await db.delete(documents);
     await db.delete(activityLog);
-    await db.delete(heartbeatRuns);
+    await deleteHeartbeatRunsWithEvents();
     await db.delete(agentWakeupRequests);
     await db.delete(issues);
     await db.delete(agentRuntimeState);