Install the sqlite3 client and add the following line to your crontab.
0 1 * * * sqlite3 /var/lib/freeswitch/db/callcenter.db "update agents set no_answer_count = 0, calls_answered = 0, last_status_change = strftime('\%s','now');"
Note: The %s is escaped for cron. You'll need to remove the...