PLT-5073 Improve performance of /channels/view endpoint (#4881)

* Improve performance of /channels/view endpoint

* Fix store unit test

model/channel_view.go

@@ -11,7 +11,6 @@ import (
 type ChannelView struct {
 	ChannelId     string `json:"channel_id"`
 	PrevChannelId string `json:"prev_channel_id"`
-	Time          int64  `json:"time"`
 }
 
 func (o *ChannelView) ToJson() string {

model/client.go

@@ -1350,10 +1350,9 @@ func (c *Client) UpdateLastViewedAt(channelId string, active bool) (*Result, *Ap
 }
 
 // ViewChannel performs all the actions related to viewing a channel. This includes marking
-// the channel and the previous one as read, marking the channel as being actively viewed.
+// the channel and the previous one as read, and marking the channel as being actively viewed.
 // ChannelId is required but may be blank to indicate no channel is being viewed.
-// PrevChannelId is optional, populate to indicate a channel switch occurred. Optionally
-// provide a non-zero Time, in Unix milliseconds, to manually set the viewing time.
+// PrevChannelId is optional, populate to indicate a channel switch occurred.
 func (c *Client) ViewChannel(params ChannelView) (bool, *ResponseMetadata) {
 	if r, err := c.DoApiPost(c.GetTeamRoute()+"/channels/view", params.ToJson()); err != nil {
 		return false, &ResponseMetadata{StatusCode: r.StatusCode, Error: err}

model/status.go

@@ -22,7 +22,7 @@ type Status struct {
 	Status         string `json:"status"`
 	Manual         bool   `json:"manual"`
 	LastActivityAt int64  `json:"last_activity_at"`
-	ActiveChannel  string `json:"active_channel"`
+	ActiveChannel  string `json:"active_channel" db:"-"`
 }
 
 func (o *Status) ToJson() string {