@classmethod
def define_tables(cls, metadata):
    Table('users', metadata, Column('user_id', INT, primary_key=True), Column('user_name', VARCHAR(20)), test_needs_acid=True)
@classmethod
def define_tables(cls, metadata):
    Table('users', metadata, Column('user_id', INT, primary_key=True), Column('user_name', VARCHAR(20)), test_needs_acid=True)