One database table very large
Thats from Civimobile extension and You can find quick solution at https://lab.civicrm.org/extensions/civimobileapi/-/issues/57#note_54817

One thing I have found is editing the scheduled job Civimobile clean
old push notification messages and setting a command / API parameter
count_of_day=1 which means keep only 1 days worth of notification
messages can help