if confirm('remove deprecated database constraints?'):

    execute = session.system_sql

    session.set_pool()

    dbhelper = session.pool.source('system').dbhelper

    cu = session.pool['system']

    for table in dbhelper.list_tables(cu):

        if table.endswith('_relation'):

            try:

                execute('ALTER TABLE %s DROP CONSTRAINT %s_fkey1' % (table, table))

                execute('ALTER TABLE %s DROP CONSTRAINT %s_fkey2' % (table, table))

            except:

                continue

    checkpoint()

if 'inline_view' in schema:

    # inline_view attribute should have been deleted for a while now....

    drop_attribute('CWRelation', 'inline_view')