fix(worker): 防止事务泄漏并恢复滞留队列

为 PostgreSQL 连接增加可配置的事务空闲与锁等待超时，并在请求取消或 Worker 退出后使用独立有界上下文回滚事务。\n\n恢复过期任务时按批次使用 SKIP LOCKED，周期重建缺失或终态 River Job；锁等待超时只在确认尚未提交上游时安全重排，避免重复执行和重复结算。\n\n验证：完整 Go 测试、go vet、生产 Kustomize 渲染、gofmt 与 git diff --check 均通过。

apps/api/cmd/gateway/main.go

@@ -37,7 +37,11 @@ func main() {
 
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 
-	db, err := store.ConnectWithMaxConns(ctx, cfg.DatabaseURL, cfg.DatabaseMaxConns)
+	db, err := store.ConnectWithPoolOptions(ctx, cfg.DatabaseURL, store.PostgresPoolOptions{
+		MaxConns:                 cfg.DatabaseMaxConns,
+		IdleInTransactionTimeout: time.Duration(cfg.DatabaseIdleInTransactionTimeoutSeconds) * time.Second,
+		LockTimeout:              time.Duration(cfg.DatabaseLockTimeoutSeconds) * time.Second,
+	})
 	if err != nil {
 		stop()
 		logger.Error("connect postgres failed", "error", err)

apps/api/internal/config/config.go

@@ -59,6 +59,8 @@ type Config struct {
 	BillingEngineMode                             string
 	ProcessRole                                   string
 	DatabaseMaxConns                              int
+	DatabaseIdleInTransactionTimeoutSeconds       int
+	DatabaseLockTimeoutSeconds                    int
 	MediaRequestConcurrency                       int
 	MediaMaterializationConcurrency               int
 	AsyncQueueWorkerEnabled                       bool
@@ -106,20 +108,27 @@ func Load() Config {
 		TaskProgressCallbackURL: env("TASK_PROGRESS_CALLBACK_URL",
 			strings.TrimRight(env("SERVER_MAIN_BASE_URL", "http://localhost:3000"), "/")+"/internal/platform/task-progress-callbacks",
 		),
-		TaskProgressCallbackTimeoutMS:     envIntValidated("TASK_PROGRESS_CALLBACK_TIMEOUT_MS", 5000),
-		TaskProgressCallbackMaxAttempts:   envIntValidated("TASK_PROGRESS_CALLBACK_MAX_ATTEMPTS", 10),
-		TaskCleanupEnabled:                env("AI_GATEWAY_TASK_CLEANUP_ENABLED", "false") == "true",
-		TaskRetentionDays:                 envIntValidated("AI_GATEWAY_TASK_RETENTION_DAYS", 30),
-		TaskAnalysisRetentionDays:         envIntValidated("AI_GATEWAY_TASK_ANALYSIS_RETENTION_DAYS", 7),
-		TaskCleanupIntervalSeconds:        envIntValidated("AI_GATEWAY_TASK_CLEANUP_INTERVAL_SECONDS", 300),
-		TaskCleanupBatchSize:              envIntValidated("AI_GATEWAY_TASK_CLEANUP_BATCH_SIZE", 1000),
-		CORSAllowedOrigin:                 env("CORS_ALLOWED_ORIGIN", "http://localhost:5178,http://127.0.0.1:5178"),
-		GlobalHTTPProxy:                   globalProxy.HTTPProxy,
-		GlobalHTTPProxySource:             globalProxy.Source,
-		LogLevel:                          logLevel(env("LOG_LEVEL", "info")),
-		BillingEngineMode:                 strings.ToLower(env("BILLING_ENGINE_MODE", "observe")),
-		ProcessRole:                       strings.ToLower(strings.TrimSpace(env("AI_GATEWAY_PROCESS_ROLE", "all"))),
-		DatabaseMaxConns:                  envInt("AI_GATEWAY_DATABASE_MAX_CONNS", 0),
+		TaskProgressCallbackTimeoutMS:   envIntValidated("TASK_PROGRESS_CALLBACK_TIMEOUT_MS", 5000),
+		TaskProgressCallbackMaxAttempts: envIntValidated("TASK_PROGRESS_CALLBACK_MAX_ATTEMPTS", 10),
+		TaskCleanupEnabled:              env("AI_GATEWAY_TASK_CLEANUP_ENABLED", "false") == "true",
+		TaskRetentionDays:               envIntValidated("AI_GATEWAY_TASK_RETENTION_DAYS", 30),
+		TaskAnalysisRetentionDays:       envIntValidated("AI_GATEWAY_TASK_ANALYSIS_RETENTION_DAYS", 7),
+		TaskCleanupIntervalSeconds:      envIntValidated("AI_GATEWAY_TASK_CLEANUP_INTERVAL_SECONDS", 300),
+		TaskCleanupBatchSize:            envIntValidated("AI_GATEWAY_TASK_CLEANUP_BATCH_SIZE", 1000),
+		CORSAllowedOrigin:               env("CORS_ALLOWED_ORIGIN", "http://localhost:5178,http://127.0.0.1:5178"),
+		GlobalHTTPProxy:                 globalProxy.HTTPProxy,
+		GlobalHTTPProxySource:           globalProxy.Source,
+		LogLevel:                        logLevel(env("LOG_LEVEL", "info")),
+		BillingEngineMode:               strings.ToLower(env("BILLING_ENGINE_MODE", "observe")),
+		ProcessRole:                     strings.ToLower(strings.TrimSpace(env("AI_GATEWAY_PROCESS_ROLE", "all"))),
+		DatabaseMaxConns:                envInt("AI_GATEWAY_DATABASE_MAX_CONNS", 0),
+
+		DatabaseIdleInTransactionTimeoutSeconds: envOptionalIntValidated(
+			"AI_GATEWAY_DATABASE_IDLE_IN_TRANSACTION_TIMEOUT_SECONDS",
+			60,
+		),
+		DatabaseLockTimeoutSeconds: envOptionalIntValidated("AI_GATEWAY_DATABASE_LOCK_TIMEOUT_SECONDS", 30),
+
 		MediaRequestConcurrency:           envIntValidated("AI_GATEWAY_MEDIA_REQUEST_CONCURRENCY", 16),
 		MediaMaterializationConcurrency:   envIntValidated("AI_GATEWAY_MEDIA_MATERIALIZATION_CONCURRENCY", 8),
 		AsyncQueueWorkerEnabled:           env("AI_GATEWAY_ASYNC_QUEUE_WORKER_ENABLED", "true") == "true",
@@ -138,6 +147,12 @@ func (c Config) Validate() error {
 	if c.DatabaseMaxConns < 0 || c.DatabaseMaxConns > 1000 {
 		return errors.New("AI_GATEWAY_DATABASE_MAX_CONNS must be between 1 and 1000 when configured")
 	}
+	if c.DatabaseIdleInTransactionTimeoutSeconds < 0 || c.DatabaseIdleInTransactionTimeoutSeconds > 3600 {
+		return errors.New("AI_GATEWAY_DATABASE_IDLE_IN_TRANSACTION_TIMEOUT_SECONDS must be between 0 and 3600")
+	}
+	if c.DatabaseLockTimeoutSeconds < 0 || c.DatabaseLockTimeoutSeconds > 3600 {
+		return errors.New("AI_GATEWAY_DATABASE_LOCK_TIMEOUT_SECONDS must be between 0 and 3600")
+	}
 	if c.MediaMaterializationConcurrency != 0 && (c.MediaMaterializationConcurrency < 1 || c.MediaMaterializationConcurrency > 256) {
 		return errors.New("AI_GATEWAY_MEDIA_MATERIALIZATION_CONCURRENCY must be between 1 and 256")
 	}
@@ -336,6 +351,18 @@ func envIntValidated(key string, fallback int) int {
 	return parsed
 }
 
+func envOptionalIntValidated(key string, fallback int) int {
+	value := envValue(key)
+	if value == "" {
+		return fallback
+	}
+	parsed, err := strconv.Atoi(value)
+	if err != nil {
+		return -1
+	}
+	return parsed
+}
+
 func envInt64Validated(key string, fallback int64) int64 {
 	value := envValue(key)
 	if value == "" {

apps/api/internal/config/config_test.go

@@ -144,6 +144,13 @@ func TestProcessRolePrecedenceAndCompatibility(t *testing.T) {
 
 func TestValidateProcessRoleAndDatabasePool(t *testing.T) {
 	cfg := Load()
+	if cfg.DatabaseIdleInTransactionTimeoutSeconds != 60 || cfg.DatabaseLockTimeoutSeconds != 30 {
+		t.Fatalf(
+			"database transaction timeouts = %d/%d, want 60/30",
+			cfg.DatabaseIdleInTransactionTimeoutSeconds,
+			cfg.DatabaseLockTimeoutSeconds,
+		)
+	}
 	cfg.ProcessRole = "invalid"
 	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "PROCESS_ROLE") {
 		t.Fatalf("Validate() error = %v, want invalid process role", err)
@@ -154,6 +161,21 @@ func TestValidateProcessRoleAndDatabasePool(t *testing.T) {
 		t.Fatalf("Validate() error = %v, want invalid database max conns", err)
 	}
 	cfg.DatabaseMaxConns = 16
+	cfg.DatabaseIdleInTransactionTimeoutSeconds = 3601
+	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "IDLE_IN_TRANSACTION") {
+		t.Fatalf("Validate() error = %v, want invalid idle transaction timeout", err)
+	}
+	cfg.DatabaseIdleInTransactionTimeoutSeconds = 60
+	cfg.DatabaseLockTimeoutSeconds = 3601
+	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "LOCK_TIMEOUT") {
+		t.Fatalf("Validate() error = %v, want invalid lock timeout", err)
+	}
+	cfg.DatabaseLockTimeoutSeconds = 30
+	t.Setenv("AI_GATEWAY_DATABASE_LOCK_TIMEOUT_SECONDS", "not-an-integer")
+	if err := Load().Validate(); err == nil || !strings.Contains(err.Error(), "LOCK_TIMEOUT") {
+		t.Fatalf("Validate() error = %v, want invalid non-integer lock timeout", err)
+	}
+	t.Setenv("AI_GATEWAY_DATABASE_LOCK_TIMEOUT_SECONDS", "30")
 	cfg.MediaMaterializationConcurrency = 257
 	if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "MEDIA_MATERIALIZATION_CONCURRENCY") {
 		t.Fatalf("Validate() error = %v, want invalid media materialization concurrency", err)

apps/api/internal/runner/queue_worker.go

@@ -80,6 +80,38 @@ func (w *asyncTaskWorker) Work(ctx context.Context, job *river.Job[asyncTaskArgs
 		w.service.logger.Debug("river async task interrupted and requeued", "taskID", task.ID, "status", queued.Status, "riverJobID", job.ID)
 		return river.JobSnooze(0)
 	}
+	if store.IsPostgresLockTimeout(runErr) {
+		queued, changed, queueErr := w.service.store.RequeueTaskBeforeUpstreamSubmission(
+			context.WithoutCancel(ctx),
+			task.ID,
+			executionToken,
+			time.Second,
+		)
+		if queueErr != nil {
+			return queueErr
+		}
+		if changed {
+			if eventErr := w.service.emit(
+				context.WithoutCancel(ctx),
+				task.ID,
+				"task.queued",
+				"queued",
+				"database_lock_timeout",
+				0.2,
+				"async task queued after database lock timeout",
+				map[string]any{"code": "database_lock_timeout"},
+				task.RunMode == "simulation",
+			); eventErr != nil {
+				w.service.logger.Warn("record database lock timeout requeue event failed", "taskID", task.ID, "error", eventErr)
+			}
+			w.service.logger.Warn("river async task requeued after database lock timeout",
+				"taskID", task.ID,
+				"status", queued.Status,
+				"riverJobID", job.ID,
+			)
+			return river.JobSnooze(time.Second)
+		}
+	}
 	w.service.logger.Warn("river async task completed with failure", "taskID", task.ID, "error", runErr, "riverJobID", job.ID)
 	return nil
 }
@@ -570,6 +602,12 @@ func (s *Service) recoverOrphanedAsyncRiverJobs(ctx context.Context) {
 		if recovered > 0 {
 			s.logger.Warn("orphaned river jobs recovered", "count", recovered)
 		}
+		if err := s.recoverAsyncRiverJobs(ctx); err != nil {
+			if ctx.Err() == nil {
+				s.logger.Warn("recover queued tasks without active river jobs failed", "error", err)
+			}
+			return
+		}
 	}
 	recoverJobs()
 	ticker := time.NewTicker(orphanedRiverJobScanInterval)

apps/api/internal/store/access_rules.go

@@ -153,7 +153,7 @@ func (s *Store) BatchAccessRules(ctx context.Context, input AccessRuleBatchInput
 	if err != nil {
 		return nil, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	for _, resource := range dedupeAccessRuleResources(input.DeleteResources) {
 		resource = normalizeAccessRuleResource(resource, input.Effect)

apps/api/internal/store/admission_queue.go

@@ -134,7 +134,7 @@ func (s *Store) QueueTaskAdmissionWithHook(
 	if err != nil {
 		return TaskAdmission{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1, 0))`, "task-admission:"+input.TaskID); err != nil {
 		return TaskAdmission{}, err
@@ -232,7 +232,7 @@ func (s *Store) tryTaskAdmission(
 	if err != nil {
 		return TaskAdmissionResult{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1, 0))`, "task-admission:"+input.TaskID); err != nil {
 		return TaskAdmissionResult{}, err
@@ -456,7 +456,7 @@ func (s *Store) RebindWaitingTaskAdmission(ctx context.Context, input TaskAdmiss
 	if err != nil {
 		return TaskAdmission{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1, 0))`, "task-admission:"+input.TaskID); err != nil {
 		return TaskAdmission{}, err
 	}
@@ -633,7 +633,7 @@ func (s *Store) DeleteTaskAdmission(ctx context.Context, taskID string) error {
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1, 0))`, "task-admission:"+taskID); err != nil {
 		return err
 	}
@@ -794,7 +794,7 @@ func (s *Store) ReapExpiredTaskAdmissions(ctx context.Context, limit int) (TaskA
 	if err != nil {
 		return TaskAdmissionReapResult{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	rows, err := tx.Query(ctx, `
 SELECT task_id::text
 FROM gateway_task_admissions

apps/api/internal/store/admission_queue_integration_test.go

@@ -543,6 +543,160 @@ SELECT
 		t.Fatalf("recovered task left admissions=%d leases=%d", recoveredAdmissions, recoveredLeases)
 	}
 
+	lockedRecoveryTask := createTask(true)
+	unlockedRecoveryTask := createTask(true)
+	if _, err := first.pool.Exec(ctx, `
+UPDATE gateway_tasks
+SET status = 'running',
+    execution_token = gen_random_uuid(),
+    execution_lease_expires_at = now() - interval '1 second'
+WHERE id = ANY($1::uuid[])`, []string{lockedRecoveryTask.ID, unlockedRecoveryTask.ID}); err != nil {
+		t.Fatalf("prepare locked recovery tasks: %v", err)
+	}
+	lockTx, err := second.pool.Begin(ctx)
+	if err != nil {
+		t.Fatalf("begin task row lock: %v", err)
+	}
+	var lockedTaskID string
+	if err := lockTx.QueryRow(ctx, `
+SELECT id::text
+FROM gateway_tasks
+WHERE id = $1::uuid
+FOR UPDATE`, lockedRecoveryTask.ID).Scan(&lockedTaskID); err != nil {
+		rollbackTransaction(lockTx)
+		t.Fatalf("lock interrupted task row: %v", err)
+	}
+	recoveryCtx, recoveryCancel := context.WithTimeout(ctx, 3*time.Second)
+	recovery, err = first.RecoverInterruptedRuntimeState(recoveryCtx)
+	recoveryCancel()
+	if err != nil {
+		rollbackTransaction(lockTx)
+		t.Fatalf("recover unlocked task while another row is locked: %v", err)
+	}
+	if recovery.RequeuedAsyncTasks < 1 {
+		rollbackTransaction(lockTx)
+		t.Fatalf("SKIP LOCKED recovery = %+v, want at least one requeued task", recovery)
+	}
+	var lockedStatus, unlockedStatus string
+	if err := first.pool.QueryRow(ctx, `
+SELECT
+  (SELECT status FROM gateway_tasks WHERE id = $1::uuid),
+  (SELECT status FROM gateway_tasks WHERE id = $2::uuid)`,
+		lockedRecoveryTask.ID,
+		unlockedRecoveryTask.ID,
+	).Scan(&lockedStatus, &unlockedStatus); err != nil {
+		rollbackTransaction(lockTx)
+		t.Fatalf("read SKIP LOCKED recovery states: %v", err)
+	}
+	if lockedStatus != "running" || unlockedStatus != "queued" {
+		rollbackTransaction(lockTx)
+		t.Fatalf("SKIP LOCKED recovery statuses = %s/%s, want running/queued", lockedStatus, unlockedStatus)
+	}
+	rollbackTransaction(lockTx)
+	recovery, err = first.RecoverInterruptedRuntimeState(ctx)
+	if err != nil {
+		t.Fatalf("recover previously locked task: %v", err)
+	}
+	if recovery.RequeuedAsyncTasks < 1 {
+		t.Fatalf("unlocked recovery = %+v, want requeued task", recovery)
+	}
+	if err := first.pool.QueryRow(ctx, `
+SELECT status
+FROM gateway_tasks
+WHERE id = $1::uuid`, lockedRecoveryTask.ID).Scan(&lockedStatus); err != nil {
+		t.Fatalf("read unlocked recovery status: %v", err)
+	}
+	if lockedStatus != "queued" {
+		t.Fatalf("unlocked recovery status = %s, want queued", lockedStatus)
+	}
+
+	preSubmissionTask := createTask(true)
+	preSubmissionToken := uuid.NewString()
+	if _, err := first.pool.Exec(ctx, `
+UPDATE gateway_tasks
+SET status = 'running',
+    execution_token = $2::uuid,
+    execution_lease_expires_at = now() + interval '5 minutes'
+WHERE id = $1::uuid`,
+		preSubmissionTask.ID,
+		preSubmissionToken,
+	); err != nil {
+		t.Fatalf("prepare pre-submission lock timeout task: %v", err)
+	}
+	if _, err := first.pool.Exec(ctx, `
+INSERT INTO gateway_task_attempts (
+  task_id, attempt_no, queue_key, status, upstream_submission_status
+)
+VALUES ($1::uuid, 1, 'integration-test', 'running', 'not_submitted')`,
+		preSubmissionTask.ID,
+	); err != nil {
+		t.Fatalf("create pre-submission attempt: %v", err)
+	}
+	requeuedTask, changed, err := first.RequeueTaskBeforeUpstreamSubmission(
+		ctx,
+		preSubmissionTask.ID,
+		preSubmissionToken,
+		time.Second,
+	)
+	if err != nil || !changed || requeuedTask.Status != "queued" {
+		t.Fatalf("pre-submission lock timeout requeue task=%+v changed=%v err=%v", requeuedTask, changed, err)
+	}
+	var preSubmissionAttempts int
+	if err := first.pool.QueryRow(ctx, `
+SELECT count(*)
+FROM gateway_task_attempts
+WHERE task_id = $1::uuid`, preSubmissionTask.ID).Scan(&preSubmissionAttempts); err != nil {
+		t.Fatalf("count cleaned pre-submission attempts: %v", err)
+	}
+	if preSubmissionAttempts != 0 {
+		t.Fatalf("pre-submission lock timeout left %d attempts, want 0", preSubmissionAttempts)
+	}
+
+	ambiguousTask := createTask(true)
+	ambiguousToken := uuid.NewString()
+	if _, err := first.pool.Exec(ctx, `
+UPDATE gateway_tasks
+SET status = 'running',
+    execution_token = $2::uuid,
+    execution_lease_expires_at = now() + interval '5 minutes'
+WHERE id = $1::uuid`,
+		ambiguousTask.ID,
+		ambiguousToken,
+	); err != nil {
+		t.Fatalf("prepare ambiguous submission task: %v", err)
+	}
+	if _, err := first.pool.Exec(ctx, `
+INSERT INTO gateway_task_attempts (
+  task_id, attempt_no, queue_key, status, upstream_submission_status
+)
+VALUES ($1::uuid, 1, 'integration-test', 'running', 'submitting')`,
+		ambiguousTask.ID,
+	); err != nil {
+		t.Fatalf("create ambiguous submission attempt: %v", err)
+	}
+	_, changed, err = first.RequeueTaskBeforeUpstreamSubmission(
+		ctx,
+		ambiguousTask.ID,
+		ambiguousToken,
+		time.Second,
+	)
+	if err != nil {
+		t.Fatalf("guard ambiguous submission task requeue: %v", err)
+	}
+	if changed {
+		t.Fatal("ambiguous submission task was requeued")
+	}
+	var ambiguousStatus string
+	if err := first.pool.QueryRow(ctx, `
+SELECT status
+FROM gateway_tasks
+WHERE id = $1::uuid`, ambiguousTask.ID).Scan(&ambiguousStatus); err != nil {
+		t.Fatalf("read ambiguous submission task: %v", err)
+	}
+	if ambiguousStatus != "running" {
+		t.Fatalf("ambiguous submission task status = %s, want running", ambiguousStatus)
+	}
+
 	terminalResidue := createTask(true)
 	result, err = first.TryTaskAdmission(ctx, inputFor(terminalResidue, 100, ""))
 	if err != nil || !result.Admitted {

apps/api/internal/store/base_models.go

@@ -101,7 +101,7 @@ func (s *Store) CreateBaseModel(ctx context.Context, input BaseModelInput) (Base
 	if err != nil {
 		return BaseModel{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	item, err := scanBaseModel(tx.QueryRow(ctx, `
 INSERT INTO base_model_catalog (
@@ -162,7 +162,7 @@ func (s *Store) UpdateBaseModel(ctx context.Context, id string, input BaseModelI
 	if err != nil {
 		return BaseModel{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	item, err := scanBaseModel(tx.QueryRow(ctx, `
 UPDATE base_model_catalog

apps/api/internal/store/billing_settlements.go

@@ -157,7 +157,7 @@ RETURNING outbox.id::text, outbox.task_id::text, outbox.action, outbox.amount::t
 }
 
 func (s *Store) ProcessBillingSettlement(ctx context.Context, settlement BillingSettlement) error {
-	return pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	return s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		var action string
 		var amount string
 		var currency string
@@ -479,7 +479,7 @@ func (s *Store) MarkBillingSettlementFailed(ctx context.Context, settlement Bill
 		taskStatus = "manual_review"
 		manualReason = "maximum settlement attempts exceeded"
 	}
-	return pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	return s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		tag, err := tx.Exec(ctx, `
 UPDATE settlement_outbox
 SET status = $3,

apps/api/internal/store/binary_result_backfill.go

@@ -19,7 +19,7 @@ func (s *Store) ListTaskBinaryResultBackfillBatch(ctx context.Context, afterID s
 		batchSize = 100
 	}
 	var items []TaskBinaryResultBackfillItem
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if _, err := tx.Exec(ctx, `SET LOCAL lock_timeout = '5s'; SET LOCAL statement_timeout = '5s'`); err != nil {
 			return err
 		}
@@ -64,7 +64,7 @@ func (s *Store) UpdateTaskBinaryResultBackfill(ctx context.Context, taskID strin
 		return false, err
 	}
 	updated := false
-	err = pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err = s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if _, err := tx.Exec(ctx, `SET LOCAL lock_timeout = '5s'; SET LOCAL statement_timeout = '5s'`); err != nil {
 			return err
 		}

apps/api/internal/store/conversations.go

@@ -62,7 +62,7 @@ func (s *Store) UpsertConversationMessages(ctx context.Context, conversationID s
 	if err != nil {
 		return nil, 0, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	refs := make([]TaskMessageRefInput, 0, len(messages))
 	newCount := 0

apps/api/internal/store/identity_admin.go

@@ -272,7 +272,7 @@ func (s *Store) DeleteUserGroup(ctx context.Context, id string) error {
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	if _, err := tx.Exec(ctx, `
 DELETE FROM gateway_access_rules

apps/api/internal/store/identity_configurations.go

@@ -59,7 +59,7 @@ func (s *Store) beginIdentityConfigurationLifecycleTx(ctx context.Context) (pgx.
 		return nil, err
 	}
 	if err := lockIdentityConfigurationLifecycle(ctx, tx); err != nil {
-		_ = tx.Rollback(ctx)
+		rollbackTransaction(tx)
 		return nil, err
 	}
 	return tx, nil
@@ -171,7 +171,7 @@ func (s *Store) ApplyIdentityManifest(ctx context.Context, id string, expectedVe
 	if err != nil {
 		return identity.Revision{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	current, err := scanIdentityRevision(tx.QueryRow(ctx, `SELECT `+identityRevisionColumns+`
 FROM gateway_identity_configuration_revisions WHERE id=$1::uuid FOR UPDATE`, id))
 	if err != nil {
@@ -282,7 +282,7 @@ func (s *Store) ActivateIdentityRevision(ctx context.Context, id string, expecte
 	if err != nil {
 		return identity.Revision{}, false, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	var foreignPairingReservation bool
 	if err := tx.QueryRow(ctx, `SELECT EXISTS(
   SELECT 1 FROM gateway_identity_pairing_start_reservation
@@ -364,7 +364,7 @@ func (s *Store) DisableActiveIdentityRevision(ctx context.Context, expectedVersi
 	if err != nil {
 		return identity.Revision{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if ok, err := hasBreakGlassManager(ctx, tx); err != nil {
 		return identity.Revision{}, err
 	} else if !ok {

apps/api/internal/store/identity_pairing.go

@@ -20,7 +20,7 @@ func (s *Store) ReserveIdentityPairingStart(ctx context.Context, attemptID strin
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if _, err := tx.Exec(ctx, `DELETE FROM gateway_identity_pairing_start_reservation
 WHERE state='starting' AND expires_at <= now()`); err != nil {
 		return err
@@ -68,7 +68,7 @@ func (s *Store) CommitIdentityPairingStart(ctx context.Context, revision identit
 	if err != nil {
 		return identity.PairingExchange{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	var reserved bool
 	if err := tx.QueryRow(ctx, `SELECT true FROM gateway_identity_pairing_start_reservation
 WHERE singleton=true AND attempt_id=$1::uuid AND state='starting' FOR UPDATE`, exchange.ID).Scan(&reserved); errors.Is(err, pgx.ErrNoRows) {
@@ -256,7 +256,7 @@ func (s *Store) UpdateIdentityPairingExchange(ctx context.Context, id string, ex
 	if err != nil {
 		return identity.PairingExchange{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	exchange, err := scanIdentityPairing(tx.QueryRow(ctx, `
 UPDATE gateway_identity_onboarding_exchanges SET status=$3,remote_version=$4,last_error_category=NULLIF($5,''),
 auth_center_audit_id=COALESCE(NULLIF($6,''),auth_center_audit_id),version=version+1,updated_at=now()
@@ -297,7 +297,7 @@ func (s *Store) CancelIdentityPairingExchange(ctx context.Context, id string, ex
 	if err != nil {
 		return identity.PairingExchange{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	exchange, err := scanIdentityPairing(tx.QueryRow(ctx, `SELECT `+identityPairingColumns+`
 FROM gateway_identity_onboarding_exchanges WHERE id=$1::uuid FOR UPDATE`, id))
 	if errors.Is(err, pgx.ErrNoRows) {
@@ -352,7 +352,7 @@ func (s *Store) CompleteIdentityPairingCleanup(ctx context.Context, id string, e
 	if err != nil {
 		return identity.PairingExchange{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	var revisionID string
 	if err := tx.QueryRow(ctx, `SELECT revision_id::text FROM gateway_identity_onboarding_exchanges
 WHERE id=$1::uuid AND version=$2 AND status='cancelled' AND cleanup_status='pending' FOR UPDATE`, id, expectedVersion).Scan(&revisionID); errors.Is(err, pgx.ErrNoRows) {

apps/api/internal/store/oidc_multi_tenant_users.go

@@ -24,7 +24,7 @@ func (s *Store) resolveOrProvisionOIDCMultiTenantUser(ctx context.Context, input
 	if err != nil {
 		return ResolveOrProvisionOIDCUserResult{}, err
 	}
-	defer func() { _ = tx.Rollback(ctx) }()
+	defer rollbackTransaction(tx)
 
 	bindingID, gatewayTenantID, tenantKey, groupID, groupKey, accessStatus, err :=
 		loadOIDCTenantBinding(ctx, tx, input)

apps/api/internal/store/oidc_tenant_context_sync.go

@@ -78,7 +78,7 @@ func (s *Store) ApplyOIDCTenantBindingSync(ctx context.Context, bindingID string
 	if err != nil {
 		return err
 	}
-	defer func() { _ = tx.Rollback(ctx) }()
+	defer rollbackTransaction(tx)
 	if unchanged {
 		tag, err := tx.Exec(ctx, `UPDATE gateway_oidc_tenant_bindings
 			SET last_sync_at=$2::timestamptz,next_sync_at=$2::timestamptz+interval '15 minutes',sync_failure_count=0,
@@ -129,7 +129,7 @@ func (s *Store) RejectOIDCTenantBinding(ctx context.Context, bindingID, category
 	if err != nil {
 		return err
 	}
-	defer func() { _ = tx.Rollback(ctx) }()
+	defer rollbackTransaction(tx)
 	tag, err := tx.Exec(ctx, `UPDATE gateway_oidc_tenant_bindings
 		SET access_status='disabled',metadata_status='rejected',last_sync_at=$2::timestamptz,
 		    next_sync_at=$2::timestamptz+interval '15 minutes',

apps/api/internal/store/oidc_users.go

@@ -69,7 +69,7 @@ func (s *Store) ResolveOrProvisionOIDCUser(ctx context.Context, input ResolveOrP
 	if err != nil {
 		return ResolveOrProvisionOIDCUserResult{}, err
 	}
-	defer func() { _ = tx.Rollback(ctx) }()
+	defer rollbackTransaction(tx)
 
 	projection, err := loadOIDCUserProjection(ctx, tx, input.Subject)
 	if err == nil {

apps/api/internal/store/platform_models.go

@@ -47,7 +47,7 @@ func (s *Store) ReplacePlatformModels(ctx context.Context, platformID string, in
 	if err != nil {
 		return nil, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	keptIDs := make([]string, 0, len(inputs))
 	for _, input := range inputs {
@@ -372,7 +372,7 @@ func (s *Store) DeletePlatformModel(ctx context.Context, id string) error {
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	result, err := tx.Exec(ctx, `DELETE FROM platform_models WHERE id = $1::uuid`, id)
 	if err != nil {

apps/api/internal/store/postgres.go

@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"errors"
 	"net"
+	"strconv"
 	"strings"
 	"time"
 	"unicode"
@@ -29,6 +30,12 @@ const (
 	postgresPoolWarmLimit   = 64
 )
 
+type PostgresPoolOptions struct {
+	MaxConns                 int
+	IdleInTransactionTimeout time.Duration
+	LockTimeout              time.Duration
+}
+
 func defaultAPIKeyScopes() []string {
 	return []string{"chat", "embedding", "rerank", "image", "image_vectorize", "video", "video_enhance", "music", "audio", "voice_clone"}
 }
@@ -81,7 +88,11 @@ func Connect(ctx context.Context, databaseURL string) (*Store, error) {
 }
 
 func ConnectWithMaxConns(ctx context.Context, databaseURL string, maxConns int) (*Store, error) {
-	config, err := postgresPoolConfig(databaseURL, maxConns)
+	return ConnectWithPoolOptions(ctx, databaseURL, PostgresPoolOptions{MaxConns: maxConns})
+}
+
+func ConnectWithPoolOptions(ctx context.Context, databaseURL string, options PostgresPoolOptions) (*Store, error) {
+	config, err := postgresPoolConfigWithOptions(databaseURL, options)
 	if err != nil {
 		return nil, err
 	}
@@ -97,19 +108,37 @@ func ConnectWithMaxConns(ctx context.Context, databaseURL string, maxConns int)
 }
 
 func postgresPoolConfig(databaseURL string, maxConns ...int) (*pgxpool.Config, error) {
+	options := PostgresPoolOptions{}
+	if len(maxConns) > 0 {
+		options.MaxConns = maxConns[0]
+	}
+	return postgresPoolConfigWithOptions(databaseURL, options)
+}
+
+func postgresPoolConfigWithOptions(databaseURL string, options PostgresPoolOptions) (*pgxpool.Config, error) {
 	config, err := pgxpool.ParseConfig(databaseURL)
 	if err != nil {
 		return nil, err
 	}
 	config.ConnConfig.ConnectTimeout = postgresConnectTimeout
 	config.ConnConfig.RuntimeParams["application_name"] = postgresApplicationName
-	if len(maxConns) > 0 && maxConns[0] > 0 {
-		config.MaxConns = int32(maxConns[0])
-		config.MinIdleConns = int32(min(maxConns[0], postgresPoolWarmLimit))
+	if options.IdleInTransactionTimeout > 0 {
+		config.ConnConfig.RuntimeParams["idle_in_transaction_session_timeout"] = postgresDuration(options.IdleInTransactionTimeout)
+	}
+	if options.LockTimeout > 0 {
+		config.ConnConfig.RuntimeParams["lock_timeout"] = postgresDuration(options.LockTimeout)
+	}
+	if options.MaxConns > 0 {
+		config.MaxConns = int32(options.MaxConns)
+		config.MinIdleConns = int32(min(options.MaxConns, postgresPoolWarmLimit))
 	}
 	return config, nil
 }
 
+func postgresDuration(value time.Duration) string {
+	return strconv.FormatInt(max(value.Milliseconds(), 1), 10) + "ms"
+}
+
 func warmPostgresPool(ctx context.Context, pool *pgxpool.Pool, count int) error {
 	if count <= 0 {
 		return pool.Ping(ctx)
@@ -152,6 +181,11 @@ func IsPostgresUnavailable(err error) bool {
 	return pgconn.SafeToRetry(err)
 }
 
+func IsPostgresLockTimeout(err error) bool {
+	var postgresError *pgconn.PgError
+	return errors.As(err, &postgresError) && postgresError.Code == "55P03"
+}
+
 func (s *Store) Close() {
 	s.pool.Close()
 }
@@ -938,7 +972,7 @@ func (s *Store) DeletePlatform(ctx context.Context, id string) error {
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	rows, err := tx.Query(ctx, `SELECT id::text FROM platform_models WHERE platform_id = $1::uuid`, id)
 	if err != nil {
@@ -1638,7 +1672,7 @@ func (s *Store) DeleteAPIKey(ctx context.Context, apiKeyID string, user *auth.Us
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	result, err := tx.Exec(ctx, `
 UPDATE gateway_api_keys
@@ -1792,7 +1826,7 @@ func (s *Store) RegisterLocalUser(ctx context.Context, input LocalRegisterInput)
 	if err != nil {
 		return GatewayUser{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	var tenantID string
 	userGroupID := ""
@@ -2065,7 +2099,7 @@ func (s *Store) CreateTaskIdempotent(ctx context.Context, input CreateTaskInput,
 	if err != nil {
 		return CreateTaskResult{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	task, err := scanGatewayTask(tx.QueryRow(ctx, `
 	INSERT INTO gateway_tasks (

apps/api/internal/store/postgres_config_test.go

@@ -55,6 +55,29 @@ func TestPostgresPoolConfigWarmsBoundedIdleConnections(t *testing.T) {
 	}
 }
 
+func TestPostgresPoolConfigSetsBoundedTransactionTimeouts(t *testing.T) {
+	config, err := postgresPoolConfigWithOptions(
+		"postgresql://gateway:password@localhost:5432/gateway?sslmode=disable",
+		PostgresPoolOptions{
+			MaxConns:                 32,
+			IdleInTransactionTimeout: 60 * time.Second,
+			LockTimeout:              30 * time.Second,
+		},
+	)
+	if err != nil {
+		t.Fatalf("parse PostgreSQL pool config: %v", err)
+	}
+	if got := config.ConnConfig.RuntimeParams["idle_in_transaction_session_timeout"]; got != "60000ms" {
+		t.Fatalf("idle transaction timeout = %q, want 60000ms", got)
+	}
+	if got := config.ConnConfig.RuntimeParams["lock_timeout"]; got != "30000ms" {
+		t.Fatalf("lock timeout = %q, want 30000ms", got)
+	}
+	if config.MaxConns != 32 || config.MinIdleConns != 32 {
+		t.Fatalf("pool bounds max=%d minIdle=%d, want 32/32", config.MaxConns, config.MinIdleConns)
+	}
+}
+
 func TestIsPostgresUnavailableClassifiesConnectivityFailures(t *testing.T) {
 	for _, testCase := range []struct {
 		name string
@@ -75,3 +98,12 @@ func TestIsPostgresUnavailableClassifiesConnectivityFailures(t *testing.T) {
 		t.Fatal("SQL syntax error was incorrectly classified as PostgreSQL unavailable")
 	}
 }
+
+func TestIsPostgresLockTimeout(t *testing.T) {
+	if !IsPostgresLockTimeout(&pgconn.PgError{Code: "55P03"}) {
+		t.Fatal("lock timeout was not classified")
+	}
+	if IsPostgresLockTimeout(&pgconn.PgError{Code: "57014"}) {
+		t.Fatal("query cancellation was classified as lock timeout")
+	}
+}

apps/api/internal/store/pricing_rules.go

@@ -113,7 +113,7 @@ func (s *Store) CreatePricingRuleSet(ctx context.Context, input PricingRuleSetIn
 	if err != nil {
 		return PricingRuleSet{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	metadata, _ := json.Marshal(emptyObjectIfNil(input.Metadata))
 	item, err := scanPricingRuleSet(tx.QueryRow(ctx, `
@@ -141,7 +141,7 @@ func (s *Store) UpdatePricingRuleSet(ctx context.Context, id string, input Prici
 	if err != nil {
 		return PricingRuleSet{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	metadata, _ := json.Marshal(emptyObjectIfNil(input.Metadata))
 	item, err := scanPricingRuleSet(tx.QueryRow(ctx, `

apps/api/internal/store/rate_limit_status.go

@@ -98,7 +98,7 @@ func (s *Store) RestorePlatformModelRuntimeStatus(ctx context.Context, platformM
 	if err != nil {
 		return ModelRateLimitStatus{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	var restoredModelID string
 	if err := tx.QueryRow(ctx, `

apps/api/internal/store/rate_limits.go

@@ -19,6 +19,8 @@ type RuntimeRecoveryResult struct {
 	CleanedTaskAdmissions     int64 `json:"cleanedTaskAdmissions"`
 }
 
+const runtimeRecoveryBatchSize = 100
+
 var ErrConcurrencyLeaseLost = errors.New("concurrency lease lost")
 
 // CheckRateLimits performs a non-consuming admission preflight for fixed-window
@@ -104,7 +106,7 @@ func (s *Store) ReserveRateLimits(ctx context.Context, taskID string, attemptID
 	if err != nil {
 		return RateLimitResult{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	lockKeys := make([]string, 0)
 	lockKeySet := make(map[string]struct{})
@@ -414,7 +416,7 @@ func (s *Store) AttachRateLimitResultToAttempt(ctx context.Context, attemptID st
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	for _, reservation := range result.Reservations {
 		if reservation.ReservationID == "" {
@@ -458,7 +460,7 @@ func (s *Store) RecoverInterruptedRuntimeState(ctx context.Context) (RuntimeReco
 	if err != nil {
 		return RuntimeRecoveryResult{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended('gateway-runtime-recovery', 0))`); err != nil {
 		return RuntimeRecoveryResult{}, err
 	}
@@ -542,7 +544,18 @@ WHERE status = 'running'
 	result.FailedAttempts = tag.RowsAffected()
 
 	asyncTaskRows, err := tx.Query(ctx, `
-UPDATE gateway_tasks
+WITH recoverable_async_tasks AS MATERIALIZED (
+  SELECT id
+  FROM gateway_tasks
+  WHERE async_mode = true
+    AND status = 'running'
+    AND execution_lease_expires_at IS NOT NULL
+    AND execution_lease_expires_at <= now()
+  ORDER BY execution_lease_expires_at ASC, id ASC
+  LIMIT $1
+  FOR UPDATE SKIP LOCKED
+)
+UPDATE gateway_tasks task
 SET status = 'queued',
     error = NULL,
     error_code = NULL,
@@ -555,11 +568,9 @@ SET status = 'queued',
     next_run_at = now(),
     finished_at = NULL,
     updated_at = now()
-WHERE async_mode = true
-  AND status = 'running'
-  AND execution_lease_expires_at IS NOT NULL
-  AND execution_lease_expires_at <= now()
-RETURNING id::text`)
+FROM recoverable_async_tasks recoverable
+WHERE task.id = recoverable.id
+RETURNING task.id::text`, runtimeRecoveryBatchSize)
 	if err != nil {
 		return RuntimeRecoveryResult{}, err
 	}
@@ -718,7 +729,7 @@ func (s *Store) finishRateLimitReservations(ctx context.Context, reservations []
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	for _, reservation := range reservations {
 		if reservation.ReservationID == "" {

apps/api/internal/store/runtime_policies.go

@@ -248,9 +248,7 @@ func (s *Store) ApplyCandidateFailureEffect(ctx context.Context, input Candidate
 	if err != nil {
 		return CandidateFailureEffectResult{}, err
 	}
-	defer func() {
-		_ = tx.Rollback(ctx)
-	}()
+	defer rollbackTransaction(tx)
 
 	lockKey := strings.TrimSpace(input.RequestedModel) + "\x1f" + strings.TrimSpace(input.ModelType)
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1::text, 0))`, lockKey); err != nil {

apps/api/internal/store/security_event_connections.go

@@ -185,7 +185,7 @@ func (s *Store) CreateSecurityEventConnection(ctx context.Context, input CreateS
 	if err != nil {
 		return SecurityEventConnection{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	_, err = tx.Exec(ctx, `
 INSERT INTO gateway_security_event_connections(
   connection_id,transmitter_issuer,endpoint_url,credential_ref,management_client_id,management_credential_ref,lifecycle_status,idempotency_key
@@ -196,7 +196,7 @@ INSERT INTO gateway_security_event_connections(
 	)
 	if err != nil {
 		if isUniqueViolation(err) {
-			_ = tx.Rollback(ctx)
+			rollbackTransaction(tx)
 			existing, getErr := s.SecurityEventConnection(ctx)
 			if getErr == nil && existing.IdempotencyKey == input.IdempotencyKey && existing.TransmitterIssuer == input.TransmitterIssuer {
 				return existing, nil
@@ -256,7 +256,7 @@ func (s *Store) SetSecurityEventManagementCredential(ctx context.Context, connec
 	if err != nil {
 		return SecurityEventConnection{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	var oldReference sql.NullString
 	var lifecycle string
 	var version int64
@@ -315,7 +315,7 @@ func (s *Store) SetSecurityEventNextCredential(ctx context.Context, connectionID
 	if err != nil {
 		return SecurityEventConnection{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	tag, err := tx.Exec(ctx, `UPDATE gateway_security_event_connections
 SET next_credential_ref=$2,lifecycle_status='rotating',last_error_category=NULL,version=version+1,updated_at=now()
 WHERE connection_id=$1::uuid AND version=$3 AND next_credential_ref IS NULL
@@ -340,7 +340,7 @@ func (s *Store) PromoteSecurityEventCredential(ctx context.Context, connectionID
 	if err != nil {
 		return SecurityEventConnection{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	var oldReference string
 	if err := tx.QueryRow(ctx, `SELECT credential_ref FROM gateway_security_event_connections
 WHERE connection_id=$1::uuid AND next_credential_ref=$2 AND lifecycle_status='rotating' FOR UPDATE`, connectionID, nextReference).Scan(&oldReference); errors.Is(err, pgx.ErrNoRows) {
@@ -381,7 +381,7 @@ func (s *Store) DiscardPreparedSecurityEventConnection(ctx context.Context, conn
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	var credentialReference string
 	var nextReference, managementReference sql.NullString
@@ -435,7 +435,7 @@ func (s *Store) FinalizeRetiringSecurityEventConnection(ctx context.Context, con
 	if err != nil {
 		return err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	var credentialReference string
 	var nextReference, managementReference sql.NullString

apps/api/internal/store/security_events.go

@@ -13,7 +13,6 @@ import (
 const (
 	securityEventTransactionLockTimeout = 5 * time.Second
 	securityEventTransactionIdleTimeout = 15 * time.Second
-	transactionRollbackTimeout          = 5 * time.Second
 )
 
 func (s *Store) beginSecurityEventTransaction(ctx context.Context) (pgx.Tx, error) {
@@ -38,12 +37,7 @@ func (s *Store) beginSecurityEventTransaction(ctx context.Context) (pgx.Tx, erro
 }
 
 func rollbackSecurityEventTransaction(tx pgx.Tx) {
-	if tx == nil {
-		return
-	}
-	ctx, cancel := context.WithTimeout(context.Background(), transactionRollbackTimeout)
-	defer cancel()
-	_ = tx.Rollback(ctx)
+	rollbackTransaction(tx)
 }
 
 type ApplySessionRevokedInput struct {

apps/api/internal/store/task_history.go

@@ -174,7 +174,7 @@ func (s *Store) CleanupTaskHistory(ctx context.Context, analysisCutoff time.Time
 		batchSize = 1000
 	}
 	var result TaskHistoryCleanupResult
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if _, err := tx.Exec(ctx, `SET LOCAL lock_timeout = '5s'; SET LOCAL statement_timeout = '5s'`); err != nil {
 			return err
 		}

apps/api/internal/store/tasks_runtime.go

@@ -286,7 +286,7 @@ func (s *Store) ClaimTaskExecution(ctx context.Context, taskID string, execution
 	}
 	var task GatewayTask
 	manualReview := false
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		var queuedReady bool
 		var runningExpired bool
 		var production bool
@@ -573,6 +573,86 @@ WHERE id = $1::uuid
 RETURNING `+gatewayTaskColumns, taskID, executionToken, nextRunAt, strings.TrimSpace(queueKey)))
 }
 
+func (s *Store) RequeueTaskBeforeUpstreamSubmission(
+	ctx context.Context,
+	taskID string,
+	executionToken string,
+	delay time.Duration,
+) (GatewayTask, bool, error) {
+	if delay < time.Second {
+		delay = time.Second
+	}
+	if delay > 10*time.Minute {
+		delay = 10 * time.Minute
+	}
+	nextRunAt := time.Now().Add(delay)
+	var task GatewayTask
+	changed := false
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
+		var err error
+		task, err = scanGatewayTask(tx.QueryRow(ctx, `
+UPDATE gateway_tasks task
+SET status = 'queued',
+    locked_by = NULL,
+    locked_at = NULL,
+    heartbeat_at = NULL,
+    execution_token = NULL,
+    execution_lease_expires_at = NULL,
+    next_run_at = $3::timestamptz,
+    error = NULL,
+    error_code = NULL,
+    error_message = NULL,
+    updated_at = now()
+WHERE task.id = $1::uuid
+  AND task.status IN ('queued', 'running')
+  AND task.execution_token = $2::uuid
+  AND COALESCE(task.remote_task_id, '') = ''
+  AND NOT EXISTS (
+    SELECT 1
+    FROM gateway_task_attempts attempt
+    WHERE attempt.task_id = task.id
+      AND COALESCE(attempt.upstream_submission_status, 'not_submitted') <> 'not_submitted'
+  )
+RETURNING `+gatewayTaskColumns, taskID, executionToken, nextRunAt))
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		changed = true
+		if _, err := tx.Exec(ctx, `
+DELETE FROM gateway_task_param_preprocessing_logs log
+USING gateway_task_attempts attempt
+WHERE log.attempt_id = attempt.id
+  AND attempt.task_id = $1::uuid
+  AND COALESCE(attempt.upstream_submission_status, 'not_submitted') = 'not_submitted'`, taskID); err != nil {
+			return err
+		}
+		if _, err := tx.Exec(ctx, `
+DELETE FROM gateway_task_attempts
+WHERE task_id = $1::uuid
+  AND COALESCE(upstream_submission_status, 'not_submitted') = 'not_submitted'`, taskID); err != nil {
+			return err
+		}
+		if _, err := tx.Exec(ctx, `
+UPDATE gateway_concurrency_leases
+SET released_at = now()
+WHERE task_id = $1::uuid
+  AND released_at IS NULL`, taskID); err != nil {
+			return err
+		}
+		if _, err := tx.Exec(ctx, `DELETE FROM gateway_task_admissions WHERE task_id = $1::uuid`, taskID); err != nil {
+			return err
+		}
+		return notifyTaskAdmissionTx(ctx, tx, "*")
+	})
+	if err != nil {
+		return GatewayTask{}, false, err
+	}
+	return task, changed, nil
+}
+
 func (s *Store) SetTaskRiverJobID(ctx context.Context, taskID string, riverJobID int64) error {
 	if riverJobID <= 0 {
 		return nil
@@ -587,7 +667,7 @@ WHERE id = $1::uuid`, taskID, riverJobID)
 
 func (s *Store) SetTaskRemoteTask(ctx context.Context, taskID string, executionToken string, attemptID string, remoteTaskID string, payload map[string]any) error {
 	payloadJSON, _ := json.Marshal(sanitizeJSONForStorage(emptyObjectIfNil(payload)))
-	return pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	return s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		tag, err := tx.Exec(ctx, `
 UPDATE gateway_tasks
 SET remote_task_id = NULLIF($3::text, ''),
@@ -644,7 +724,7 @@ func (s *Store) CancelQueuedTask(ctx context.Context, taskID string, message str
 	message = truncateUTF8Bytes(message, 2048)
 	var task GatewayTask
 	changed := false
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1, 0))`, "task-admission:"+taskID); err != nil {
 			return err
 		}
@@ -705,7 +785,7 @@ func (s *Store) CancelTaskBeforeUpstreamSubmission(
 	message = truncateUTF8Bytes(message, 2048)
 	var task GatewayTask
 	changed := false
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended($1, 0))`, "task-admission:"+taskID); err != nil {
 			return err
 		}
@@ -789,7 +869,7 @@ func (s *Store) CancelSubmittedTask(ctx context.Context, taskID string, executio
 	message = truncateUTF8Bytes(message, 2048)
 	var task GatewayTask
 	changed := false
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		var err error
 		task, err = scanGatewayTask(tx.QueryRow(ctx, `
 UPDATE gateway_tasks
@@ -851,14 +931,23 @@ func (s *Store) ListRecoverableAsyncTasks(ctx context.Context, limit int) ([]Asy
 		limit = 500
 	}
 	rows, err := s.pool.Query(ctx, `
-SELECT id::text, priority, next_run_at
-FROM gateway_tasks
-WHERE async_mode = true
+SELECT task.id::text, task.priority, task.next_run_at
+FROM gateway_tasks task
+LEFT JOIN river_job job ON job.id = task.river_job_id
+WHERE task.async_mode = true
   AND (
-    status = 'queued'
-    OR (status = 'running' AND (execution_lease_expires_at IS NULL OR execution_lease_expires_at <= now()))
+    task.status = 'queued'
+    OR (
+      task.status = 'running'
+      AND (task.execution_lease_expires_at IS NULL OR task.execution_lease_expires_at <= now())
+    )
   )
-ORDER BY priority ASC, created_at ASC
+  AND (
+    task.river_job_id IS NULL
+    OR job.id IS NULL
+    OR job.state NOT IN ('available', 'pending', 'retryable', 'running', 'scheduled')
+  )
+ORDER BY task.priority ASC, task.created_at ASC
 LIMIT $1`, limit)
 	if err != nil {
 		return nil, err
@@ -883,7 +972,7 @@ func (s *Store) CreateTaskAttempt(ctx context.Context, input CreateTaskAttemptIn
 	if err != nil {
 		return "", err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 
 	var attemptID string
 	err = tx.QueryRow(ctx, `
@@ -1301,7 +1390,7 @@ func (s *Store) FinishTaskSuccess(ctx context.Context, input FinishTaskSuccessIn
 		finalChargeAmount = strconv.FormatFloat(input.FinalChargeAmount, 'f', 9, 64)
 	}
 	currency := normalizeWalletCurrency(input.BillingCurrency)
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if strings.TrimSpace(input.AttemptID) != "" {
 			if _, err := tx.Exec(ctx, `
 UPDATE gateway_task_attempts
@@ -1430,7 +1519,7 @@ func (s *Store) FinishTaskManualReview(ctx context.Context, input FinishTaskManu
 	}
 	resultJSON, _ := json.Marshal(resultReport.Value)
 	pricingSnapshotJSON, _ := json.Marshal(sanitizeJSONForStorage(emptyObjectIfNil(input.PricingSnapshot)))
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if strings.TrimSpace(input.AttemptID) != "" {
 			attemptStatus := "failed"
 			if status == "succeeded" {
@@ -1532,7 +1621,7 @@ func (s *Store) SettleTaskBilling(ctx context.Context, task GatewayTask) error {
 		"billingSummary": task.BillingSummary,
 	}
 	metadata, _ := json.Marshal(sanitizeJSONForStorage(metadataMap))
-	return pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	return s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		if _, err := tx.Exec(ctx, `
 INSERT INTO gateway_wallet_accounts (
   gateway_tenant_id, gateway_user_id, tenant_id, tenant_key, user_id, currency
@@ -1662,7 +1751,7 @@ func (s *Store) FinishTaskFailure(ctx context.Context, input FinishTaskFailureIn
 	metricsJSON, _ := json.Marshal(sanitizeJSONForStorage(emptyObjectIfNil(input.Metrics)))
 	resultJSON, _ := json.Marshal(minimalTaskResult(nil))
 	message := truncateUTF8Bytes(input.Message, 2048)
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		tag, err := tx.Exec(ctx, `
 	UPDATE gateway_tasks
 	SET status = 'failed',
@@ -1817,7 +1906,7 @@ func (s *Store) AddTaskEvent(ctx context.Context, taskID string, eventType strin
 	if err != nil {
 		return TaskEvent{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if _, err := tx.Exec(ctx, `SELECT 1 FROM gateway_tasks WHERE id = $1::uuid FOR UPDATE`, taskID); err != nil {
 		return TaskEvent{}, err
 	}

apps/api/internal/store/tx.go

@@ -2,18 +2,52 @@ package store
 
 import (
 	"context"
+	"errors"
+	"time"
 
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgconn"
 )
 
+const transactionRollbackTimeout = 5 * time.Second
+
 type Tx interface {
 	Exec(ctx context.Context, sql string, arguments ...any) (pgconn.CommandTag, error)
 	QueryRow(ctx context.Context, sql string, args ...any) pgx.Row
 }
 
 func (s *Store) InTx(ctx context.Context, fn func(Tx) error) error {
-	return pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	return s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		return fn(tx)
 	})
 }
+
+func (s *Store) beginTransaction(ctx context.Context, fn func(pgx.Tx) error) (err error) {
+	tx, err := s.pool.Begin(ctx)
+	if err != nil {
+		return err
+	}
+	// A Worker shutdown cancels ctx before in-flight callbacks return. Use an
+	// independent bounded context so rollback still reaches PostgreSQL.
+	defer func() {
+		rollbackCtx, cancel := context.WithTimeout(context.Background(), transactionRollbackTimeout)
+		defer cancel()
+		rollbackErr := tx.Rollback(rollbackCtx)
+		if err == nil && rollbackErr != nil && !errors.Is(rollbackErr, pgx.ErrTxClosed) {
+			err = rollbackErr
+		}
+	}()
+	if err = fn(tx); err != nil {
+		return err
+	}
+	return tx.Commit(ctx)
+}
+
+func rollbackTransaction(tx pgx.Tx) {
+	if tx == nil {
+		return
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), transactionRollbackTimeout)
+	defer cancel()
+	_ = tx.Rollback(ctx)
+}

apps/api/internal/store/wallet.go

@@ -163,7 +163,7 @@ func (s *Store) ReserveTaskBilling(ctx context.Context, task GatewayTask, user *
 	reservations := make([]WalletBillingReservation, 0, len(amounts))
 	pricingSnapshotJSON, _ := json.Marshal(sanitizeJSONForStorage(pricingSnapshot))
 	requestFingerprint := walletString(pricingSnapshot["requestFingerprint"])
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		for currency, rawAmount := range amounts {
 			amount := roundMoney(rawAmount)
 			if amount <= 0 {
@@ -309,7 +309,7 @@ func (s *Store) reserveTaskBillingExact(ctx context.Context, task GatewayTask, g
 	pricingSnapshotJSON, _ := json.Marshal(sanitizeJSONForStorage(pricingSnapshot))
 	requestFingerprint := walletString(pricingSnapshot["requestFingerprint"])
 	var reservations []WalletBillingReservation
-	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	err := s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		var positive bool
 		if err := tx.QueryRow(ctx, `SELECT $1::numeric(38, 9) > 0`, amount).Scan(&positive); err != nil {
 			return fmt.Errorf("invalid exact reservation amount: %w", err)
@@ -408,7 +408,7 @@ func (s *Store) ReleaseTaskBillingReservations(ctx context.Context, reservations
 	if reason == "" {
 		reason = "task_not_settled"
 	}
-	return pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+	return s.beginTransaction(ctx, func(tx pgx.Tx) error {
 		taskIDs := map[string]struct{}{}
 		for _, reservation := range reservations {
 			if strings.TrimSpace(reservation.AccountID) == "" {

apps/api/internal/store/worker_registry.go

@@ -70,7 +70,7 @@ func (s *Store) RegisterWorkerInstance(ctx context.Context, input WorkerRegistra
 	if err != nil {
 		return WorkerAllocation{}, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	// Worker heartbeats and allocations are ephemeral coordination state that is
 	// refreshed every few seconds. Do not hold the global allocation lock while
 	// waiting for a synchronous replica to acknowledge the commit.
@@ -245,7 +245,7 @@ func (s *Store) RecoverOrphanedAsyncRiverJobs(
 	if err != nil {
 		return 0, err
 	}
-	defer tx.Rollback(ctx)
+	defer rollbackTransaction(tx)
 	if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtextextended('gateway-river-orphan-recovery', 0))`); err != nil {
 		return 0, err
 	}

deploy/kubernetes/production/application-config.yaml

@@ -24,6 +24,8 @@ data:
   AI_GATEWAY_TASK_ANALYSIS_RETENTION_DAYS: "7"
   AI_GATEWAY_TASK_CLEANUP_INTERVAL_SECONDS: "300"
   AI_GATEWAY_TASK_CLEANUP_BATCH_SIZE: "1000"
+  AI_GATEWAY_DATABASE_IDLE_IN_TRANSACTION_TIMEOUT_SECONDS: "60"
+  AI_GATEWAY_DATABASE_LOCK_TIMEOUT_SECONDS: "30"
   CORS_ALLOWED_ORIGIN: https://ai.51easyai.com
   AI_GATEWAY_PUBLIC_BASE_URL: https://ai.51easyai.com
   AI_GATEWAY_WEB_BASE_URL: https://ai.51easyai.com