For convenience, as we can get one of the contacts from the with contact but the other one is only available in the subject, which requires parsing.
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We might want to backfill these back to the date of the May data export to Faircom as that would allow us to only use this data to generate a list of merged contact id pairs to send to Faircom. See T406771: Develop process to prevent direct mail being sent to long-deleted cids
Change #1312586 had a related patch set uploaded (by Lars SG; author: Lars SG):
[wikimedia/fundraising/crm@master] Add source_record_id to Merge activities
Change #1312586 merged by jenkins-bot:
[wikimedia/fundraising/crm@master] Add source_record_id to Merge activities
Change #1312624 had a related patch set uploaded (by Lars SG; author: Lars SG):
[wikimedia/fundraising/crm@master] Backfill source_record_id on 'Contact Merged' activities.
Change #1312624 merged by jenkins-bot:
[wikimedia/fundraising/crm@master] Backfill source_record_id on 'Contact Merged' activities.