Add first seen date to user properties

[sdgandhi]

Describe the solution you'd like

When building insights, I would like to filter on a person's first seen date.

Describe alternatives you've considered

Can't find alternative.

Additional context

The first seen date exists on person because I can see that in the person detail page. However this is not an official property, so it's not exposed in insight filters.

[macobo]

Duplicate: https://github.com/PostHog/posthog/issues/3031

[posthog-bot]

This issue hasn't seen activity in two years! If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in two weeks.

[mariusandra]

You can now do select created_at from persons