In some of my CiviCRM database, i have contacts who share the same email. I don't want people to modify the wrong contact when filling a public anonymous form.

To avoid that, I'd like the unsupervised dedupe rule for individual to be Email + First Name.

When i go to the UI (/civicrm/contact/deduperules?reset=1&action=browse) i see it's not possible to change the default rule. Is there any problem to expect if i disable the default rule in the database by setting is_active = 0 and create a new unsupervised rule ?


I see there is no is_active field so i guess i will have to either delete, either changed it to a General type of rule.

The question is the same - is there any problem to expect ?


1 Answer 1


On our site we simply created a new rule, and chose the 'Unsupervised' option when creating it.

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That creates the rule, and marks it as the default 'Unsupervised' one. The old default is downgraded to a 'General' rule. If it was a built-in rule then it stays 'reserved' so you can't edit it.

I don't think there's any need to delete them, or fiddle in the database =]

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