The loop at lines 180-202 calls _resolve_assignee_by_email() for each issue with an assignee. This function makes multiple database queries per call: one to look up the user by email, potentially creates user and userprofile records, makes a Slack API call for new users, and then does an ExternalProfile.objects.get_or_create(). With many Linear issues having assignees, this creates an N+1 query pattern that could cause significant performance degradation during sync.

Also found at:

• src/firetower/incidents/services.py:187-202