- Use .scalars().first() + LIMIT 1 instead of scalar_one_or_none()
which crashes when multiple activities exist for the same source
- Allow re-Create after Delete (re-publish after unpublish)
- Add missing on_post_unpublished handler to root shared copy
- Sync add_follower upsert fix to root shared
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Phase 3-5 of ActivityPub integration:
- Federation handlers: post.published, calendar_entry.created, product.listed
→ publish_activity() for AP outbox
- AP delivery handler: federation.activity_created → sign + POST to follower
inboxes with HTTP Signatures
- IPFS storage wired into publish_activity() (best-effort)
- Anchoring utility: merkle trees + OpenTimestamps Bitcoin timestamping
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
