After Merging Contacts -> dig up a Contact in the Trash bin and you'll see something like:
Where does CiviCRM store this information? How does it track which Contact is merged with which Contact?
asked Dec 16, 2019 at 18:57
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I can see an activity in the merged record, but I doubt that's what CiviCRM is using here. I looked in all the tables like "%log%" to no avail.– Alan DixonDec 16, 2019 at 19:27
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1 Answer
An activity gets recorded when you merge and it looks up the target contact via that.
Use $winnerContact = civicrm_api3('Contact', 'getmergedto', ['contact_id' => $contactId]).
See also https://github.com/civicrm/civicrm-core/blob/5.20.2/api/v3/Contact.php#L1275
