⚠ OPERATOR ACTION REQUIRED ⚠

This major version upgrade changes:

1. TOTP_VAULT_KEY is now REQUIRED. Generate with:
   openssl rand -base64 32
   Add to your app environment config before deploying.

2. Plausible image moved from Docker Hub (plausible/analytics)
   to GitHub Container Registry (ghcr.io/plausible/community-edition).

3. PostgreSQL upgraded from 13 → 16 (major version jump).
   The recipe handles this automatically via pg_upgrade on first boot.
   Take a volume backup before upgrading!

4. ClickHouse upgraded from 23.4 → 24.3 (data-compatible upgrade).

See upstream upgrade notes:
https://github.com/plausible/analytics/releases/tag/v2.1.0