postgres_roles = {}
postgres_db = {}

for user, config in node.metadata['postgresql']['users'].items():
    postgres_roles[user] = {
        'password': config['password'],
    }

for database, config in node.metadata['postgresql']['databases'].items():
    postgres_db[database] = {
        'owner': config['owner'],
        'needs': {
            'postgres_role:{}'.format(config['owner']),
        },
    }