fix: 7 performance/correctness fixes — v0.1.20

1. Убрано логирование тела сообщения (256KB I/O на каждый send — perf+security)
2. SentTimestamp исправлен: m.SentTime вместо time.Now() (баг)
3. MD5 не пересчитывается на ReceiveMessage — используется кэш из SendMessage
4. ChangeMessageVisibility/batch теперь персистит в Redis (баг — потеря данных)
5. MessageDoesNotExist error code: QueueExists → ReceiptHandleIsInvalid (copy-paste баг)
6. copystructure убран из GetQueueAttributes — простой map lookup
7. SNS dead code удалён (SnsErrors, SnsErrorType — не используется в SQS сервисе)

Tested: quick_test 31/31 PASS, deployed v0.1.20

app/gosqs/get_queue_attributes.go

@@ -1,4 +1,4 @@
-// Изменено: 2026-04-09
+// Изменено: 2026-04-11 — убрана зависимость от copystructure (лишняя аллокация)
 // GetQueueAttributesV1 — возвращает атрибуты очереди тенанта.
 package gosqs
 
@@ -11,7 +11,6 @@ import (
 "shared-sqs/app/interfaces"
 "shared-sqs/app/models"
 "shared-sqs/app/utils"
-"github.com/mitchellh/copystructure"
 log "github.com/sirupsen/logrus"
 )
 
@@ -32,29 +31,29 @@ if t == nil {
 return utils.CreateErrorResponseV1("InvalidClientTokenId", true)
 }
 
-requestedAttributes := func() map[string]bool {
-attrs := map[string]bool{}
-if len(requestBody.AttributeNames) == 0 {
-return map[string]bool{"All": true}
-}
-for _, attr := range requestBody.AttributeNames {
-if "All" == attr {
-return map[string]bool{"All": true}
-}
-attrs[attr] = true
-}
-return attrs
-}()
+// Определяем набор запрошенных атрибутов (или All)
+	requestedAttributes := func() map[string]bool {
+		attrs := map[string]bool{}
+		if len(requestBody.AttributeNames) == 0 {
+			return map[string]bool{"All": true}
+		}
+		for _, attr := range requestBody.AttributeNames {
+			if "All" == attr {
+				return map[string]bool{"All": true}
+			}
+			attrs[attr] = true
+		}
+		return attrs
+	}()
 
-dupe, _ := copystructure.Copy(models.AvailableQueueAttributes)
-includedAttributes, _ := dupe.(map[string]bool)
-_, ok = requestedAttributes["All"]
-if !ok {
-for attr := range includedAttributes {
-if _, ok := requestedAttributes[attr]; !ok {
-delete(includedAttributes, attr)
-}
-}
+	// Фильтруем атрибуты без deep copy — простая проверка через map lookup
+	_, wantAll := requestedAttributes["All"]
+	shouldInclude := func(attr string) bool {
+		if wantAll {
+			return true
+		}
+		_, ok := requestedAttributes[attr]
+		return ok
 }
 
 uriSegments := strings.Split(requestBody.QueueUrl, "/")
@@ -72,37 +71,37 @@ log.Errorf("Get Queue Attributes: %s queue does not exist for tenant %s", queueN
 return utils.CreateErrorResponseV1("QueueNotFound", true)
 }
 
-if _, ok := includedAttributes["DelaySeconds"]; ok {
+if shouldInclude("DelaySeconds") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "DelaySeconds", Value: strconv.Itoa(queue.DelaySeconds)})
 }
-if _, ok := includedAttributes["MaximumMessageSize"]; ok {
+if shouldInclude("MaximumMessageSize") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "MaximumMessageSize", Value: strconv.Itoa(queue.MaximumMessageSize)})
 }
-if _, ok := includedAttributes["MessageRetentionPeriod"]; ok {
+if shouldInclude("MessageRetentionPeriod") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "MessageRetentionPeriod", Value: strconv.Itoa(queue.MessageRetentionPeriod)})
 }
-if _, ok := includedAttributes["ReceiveMessageWaitTimeSeconds"]; ok {
+if shouldInclude("ReceiveMessageWaitTimeSeconds") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "ReceiveMessageWaitTimeSeconds", Value: strconv.Itoa(queue.ReceiveMessageWaitTimeSeconds)})
 }
-if _, ok := includedAttributes["VisibilityTimeout"]; ok {
+if shouldInclude("VisibilityTimeout") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "VisibilityTimeout", Value: strconv.Itoa(queue.VisibilityTimeout)})
 }
-if _, ok := includedAttributes["ApproximateNumberOfMessages"]; ok {
+if shouldInclude("ApproximateNumberOfMessages") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "ApproximateNumberOfMessages", Value: strconv.Itoa(len(queue.Messages))})
 }
-if _, ok := includedAttributes["ApproximateNumberOfMessagesNotVisible"]; ok {
+if shouldInclude("ApproximateNumberOfMessagesNotVisible") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "ApproximateNumberOfMessagesNotVisible", Value: strconv.Itoa(numberOfHiddenMessagesInQueue(*queue))})
 }
-if _, ok := includedAttributes["CreatedTimestamp"]; ok {
+if shouldInclude("CreatedTimestamp") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "CreatedTimestamp", Value: "0000000000"})
 }
-if _, ok := includedAttributes["LastModifiedTimestamp"]; ok {
+if shouldInclude("LastModifiedTimestamp") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "LastModifiedTimestamp", Value: "0000000000"})
 }
-if _, ok := includedAttributes["QueueArn"]; ok {
+if shouldInclude("QueueArn") {
 queueAttributes = append(queueAttributes, models.Attribute{Name: "QueueArn", Value: queue.Arn})
 }
-if _, ok := includedAttributes["RedrivePolicy"]; ok && queue.DeadLetterQueue != nil {
+if shouldInclude("RedrivePolicy") && queue.DeadLetterQueue != nil {
 queueAttributes = append(queueAttributes, models.Attribute{
 Name:  "RedrivePolicy",
 Value: fmt.Sprintf(`{"maxReceiveCount":"%d", "deadLetterTargetArn":"%s"}`, queue.MaxReceiveCount, queue.DeadLetterQueue.Arn),