MM-55295: Improve DB performance of some (Take 2) (#25865)

* Revert "Revert "MM-55295: Improve DB performance of some APIs (#25318)" (#25852)"

This reverts commit 077221a940.

* Fix the issue

```release-note
NONE
```

* lint fix

```release-note
NONE
```

server/channels/store/timerlayer/timerlayer.go

@@ -917,10 +917,10 @@ func (s *TimerLayerChannelStore) GetAll(teamID string) ([]*model.Channel, error)
 	return result, err
 }
 
-func (s *TimerLayerChannelStore) GetAllChannelMembersById(id string) ([]string, error) {
+func (s *TimerLayerChannelStore) GetAllChannelMemberIdsByChannelId(id string) ([]string, error) {
 	start := time.Now()
 
-	result, err := s.ChannelStore.GetAllChannelMembersById(id)
+	result, err := s.ChannelStore.GetAllChannelMemberIdsByChannelId(id)
 
 	elapsed := float64(time.Since(start)) / float64(time.Second)
 	if s.Root.Metrics != nil {
@@ -928,7 +928,7 @@ func (s *TimerLayerChannelStore) GetAllChannelMembersById(id string) ([]string,
 		if err == nil {
 			success = "true"
 		}
-		s.Root.Metrics.ObserveStoreMethodDuration("ChannelStore.GetAllChannelMembersById", success, elapsed)
+		s.Root.Metrics.ObserveStoreMethodDuration("ChannelStore.GetAllChannelMemberIdsByChannelId", success, elapsed)
 	}
 	return result, err
 }
@@ -1461,6 +1461,22 @@ func (s *TimerLayerChannelStore) GetMemberForPost(postID string, userID string,
 	return result, err
 }
 
+func (s *TimerLayerChannelStore) GetMemberLastViewedAt(ctx context.Context, channelID string, userID string) (int64, error) {
+	start := time.Now()
+
+	result, err := s.ChannelStore.GetMemberLastViewedAt(ctx, channelID, userID)
+
+	elapsed := float64(time.Since(start)) / float64(time.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if err == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("ChannelStore.GetMemberLastViewedAt", success, elapsed)
+	}
+	return result, err
+}
+
 func (s *TimerLayerChannelStore) GetMembers(channelID string, offset int, limit int) (model.ChannelMembers, error) {
 	start := time.Now()