include user delete at (#15191)

model/channel_member_history_result.go

@@ -10,7 +10,8 @@ type ChannelMemberHistoryResult struct {
 	LeaveTime *int64
 
 	// these two fields are never set in the database - when we SELECT, we join on Users to get them
-	UserEmail string `db:"Email"`
-	Username  string
-	IsBot     bool
+	UserEmail    string `db:"Email"`
+	Username     string
+	IsBot        bool
+	UserDeleteAt int64
 }