v0.1.35: устранены гонки map (ChangeVisibility/DeleteBatch) и nil-deref под Lock + OverLimit

app/gosqs/change_message_visibility_batch.go

@@ -42,10 +42,6 @@ func ChangeMessageVisibilityBatchV1(req *http.Request) (int, interfaces.Abstract
 
 	key := tenantQueueKey(t.AccessKey, queueName)
 
-	if _, ok := models.SyncQueues.Queues[key]; !ok {
-		return utils.CreateErrorResponseV1("QueueNotFound", true)
-	}
-
 	if len(requestBody.Entries) == 0 {
 		return utils.CreateErrorResponseV1("EmptyBatchRequest", true)
 	}
@@ -66,6 +62,13 @@ func ChangeMessageVisibilityBatchV1(req *http.Request) (int, interfaces.Abstract
 	models.SyncQueues.Lock()
 	defer models.SyncQueues.Unlock()
 
+	// Проверка существования очереди ВНУТРИ Lock: раньше была БЕЗ блокировки
+	// (чтение map) — concurrent map read/write при параллельном DeleteQueue.
+	queue, exists := models.SyncQueues.Queues[key]
+	if !exists {
+		return utils.CreateErrorResponseV1("QueueNotFound", true)
+	}
+
 	successEntries := make([]models.ChangeMessageVisibilityBatchResultEntry, 0)
 	failedEntries := make([]models.BatchResultErrorEntry, 0)
 
@@ -81,7 +84,6 @@ func ChangeMessageVisibilityBatchV1(req *http.Request) (int, interfaces.Abstract
 		}
 
 		messageFound := false
-		queue := models.SyncQueues.Queues[key]
 		for i := 0; i < len(queue.Messages); i++ {
 			if queue.Messages[i].ReceiptHandle == entry.ReceiptHandle {
 				if entry.VisibilityTimeout == 0 {
@@ -114,7 +116,7 @@ func ChangeMessageVisibilityBatchV1(req *http.Request) (int, interfaces.Abstract
 
 	// Персистим изменения в Redis под Lock
 	if len(successEntries) > 0 {
-		persistence.SaveQueue(key, models.SyncQueues.Queues[key])
+		persistence.SaveQueue(key, queue)
 	}
 
 	respStruct := models.ChangeMessageVisibilityBatchResponse{