<s> """<STR_LIT>""" <EOL> from alembic import op <EOL> import sqlalchemy as sa <EOL> revision = "<STR_LIT>" <EOL> down_revision = "<STR_LIT>" <EOL> def upgrade ( ) : <EOL> op . add_column ( "<STR_LIT>" , sa . Column ( "<STR_LIT:path>" , sa . Text ( ) , nullable = True ) ) <EOL> op . create_unique_constraint ( None , "<STR_LIT>" , [ "<STR_LIT:path>" ] ) <EOL> def downgrade ( ) : <EOL> op . drop_constraint ( None , "<STR_LIT>" , type_ = "<STR_LIT>" ) <EOL> op . drop_column ( "<STR_LIT>" , "<STR_LIT:path>" ) </s>
