code: def execute(self, conn, migration_url="", migration_input="", create_by="", migration_request_id="", transaction=False):
          
          binds = {}
  	result = self.dbi.processData(self.sql, binds, conn, transaction)
          result = self.formatDict(result)
  	if len(result) == 0 :
  	    return []
  	if result[0]["migration_request_id"] in ('', None) :
  	    return []
          return result
docs: Lists the oldest request queued