## Is your feature request related to a problem?

/api/person/merge currently performs a merge of two people. This logic is duplicated between app and plugin-server, badly.

## Describe the solution you'd like

Avoid duplicating, send a message to plugin-server

## Describe alternatives you've considered

Duplicating tricky and race-condition-heavy logic.

## Additional context

cc @yakkomajuri this is worth adding to team extensibility backlog - pretty sure this will cause bad correctness issues.

#### *Thank you* for your feature request – we love each and every one!

posthog/test/test_person_model.py
import datetime
import pytz
from posthog.models import Action, ActionStep, Cohort, Event, Person
from posthog.test.base import BaseTest
class TestPerson(BaseTest):