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Evan JarrettandClaude Opus 5
4c04983e23
last_seen means "this user did something recently". The backfill walks every historical record in the network, so stamping it there recorded when the backfill ran, not when the user was active — for every user at once, on every run. That destroys the only signal the column carries, and it is the one column in users that nothing upstream can rebuild. It is now written on the two paths that represent real activity: an interactive login, and a live commit event on the firehose, which does mean the user just wrote a record. The backfill still corrects handle, PDS endpoint and avatar, which is why it re-resolves rather than trusting a cache; it just no longer claims the user was present. UpsertUser grows an options form rather than a fourth named variant, since the avatar and last_seen decisions are independent and all four combinations occur. Anyone computing MAU from this column should know it was unreliable for every backfill run before this change. Also corrects docs/HORIZONTAL_SCALING.md, which claimed oci_client and registry_domain were local-only preferences. They are fields on io.atcr.sailor.profile: settings writes them to the user's PDS and ProcessSailorProfile refreshes the local cache. users is fully derived apart from last_seen. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>