def downgrade():
    op.drop_constraint(None, 'Shows', type_='foreignkey')
    op.alter_column('Shows', 'name', existing_type=sa.VARCHAR(), nullable=True)
def downgrade():
    op.drop_constraint(None, 'Shows', type_='foreignkey')
    op.alter_column('Shows', 'name', existing_type=sa.VARCHAR(), nullable=True)