Persons-on-events V2 Checklist

[yakkomajuri]

A checklist of things we still need to do before enabling PoE v2 for everyone:

• [x] https://posthog.sentry.io/issues/3918069788/?query=is%3Aunresolved+CH&referrer=issue-stream&statsPeriod=14d&stream_index=19 @yakkomajuri
• [x] https://posthog.sentry.io/issues/4102203928/?project=1899813&referrer=slack @yakkomajuri
• [x] plugin_log_entries ghost part issue (non-blocking but would be good to handle) @yakkomajuri
• [ ] Mechanism for flipping back to normal queries early on @yakkomajuri: #15459
• [x] Checking cohorts in PoE v2 @yakkomajuri
• [x] #14782 @tomasfarias
• [x] Performance benchmarking @yakkomajuri
• [ ] PoE v2 writes for everyone @tiina303
• [ ] Backfill async migration @yakkomajuri
• [ ] #15120 (non-blocking) @yakkomajuri
• [ ] Docs & communication

[yakkomajuri]

• Follow ups to plugin_log_entries issue: metric, EU cluster check
• Team that should aggregate by distinct ID is somehow on PoE v2

[yakkomajuri]

• Actions