def METHOD_NAME():
    op.alter_column('recipe', 'autopick_random',
            existing_type=sa.Boolean, nullable=True)
    op.alter_column('retention_tag', 'expire_in_days',
            existing_type=sa.Integer, nullable=True)
    op.alter_column('retention_tag', 'needs_product',
            existing_type=sa.Boolean, nullable=True)
    op.alter_column('task', 'valid',
            existing_type=sa.Boolean, nullable=True,
            server_default='1')
    # No downgrade for the other columns as they were just fixing mistakes in 
    # earlier upgrades.