Adding ability to upgrade postgres schema

store/sql_channel_store.go

@@ -37,8 +37,7 @@ func NewSqlChannelStore(sqlStore *SqlStore) ChannelStore {
 }
 
 func (s SqlChannelStore) UpgradeSchemaIfNeeded() {
-	s.CreateColumnIfNotExists("Channels", "ExtraUpdateAt", "TotalMsgCount", "bigint(20)", "0")
-	s.CreateColumnIfNotExists("Channels", "CreatorId", "ExtraUpdateAt", "varchar(26)", "")
+	s.CreateColumnIfNotExists("Channels", "CreatorId", "varchar(26)", "character varying(26)", "")
 }
 
 func (s SqlChannelStore) CreateIndexesIfNotExists() {