Removed unused SQLA types
Removed unused SQLA types

lucius-feng/flaskbb,SeanChen0617/flaskbb-1,China-jp/flaskbb,lucius-feng/flaskbb,realityone/flaskbb,SeanChen0617/flaskbb-1,Aaron1992/flaskbb,qitianchan/flaskbb,qitianchan/flaskbb,dromanow/flaskbb,lucius-feng/flaskbb,zky001/flaskbb,SeanChen0617/flaskbb,SeanChen0617/flaskbb,zky001/flaskbb,Aaron1992/flaskbb,emile2016/flaskbb,dromanow/flaskbb,zky001/flaskbb,emile2016/flaskbb,qitianchan/flaskbb,realityone/flaskbb,China-jp/flaskbb,dromanow/flaskbb,Aaron1992/flaskbb,SeanChen0617/flaskbb-1,emile2016/flaskbb,SeanChen0617/flaskbb,realityone/flaskbb,China-jp/flaskbb