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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def event_return(events):
    '''
    Return event to a postgres server

    Require that configuration be enabled via 'event_return'
    option in master config.
    '''
    conn = _get_conn()
    if conn is None:
        return None
    cur = conn.cursor()
    for event in events:
        tag = event.get('tag', '')
        data = event.get('data', '')
        sql = '''INSERT INTO salt_events
                (tag, data, master_id)
                VALUES (%s, %s, %s)'''
        cur.execute(sql, (tag, salt.utils.json.dumps(data), __opts__['id']))
    _close_conn(conn)