The field 'rule_length' doesn't exist
It has been a while since I edited our dedupe rules so I do not know for how long we have had this problem but using 5.34 (drupal 7.78) when editing a dedupe rule I get the message:
The field 'rule_length' doesn't exist.
The contents of my civicrm_dedupe_rule table look like this, so it seems to be fine:
I tried to edit both rules where the value for rule_length is currently set or NULL