Added

When receiving a public reply, missing posts (up to BackfillDepth) and fetched, or re-fetched periodically (BackfillInterval) to detect editing or deletion
Soft deletion: deleted posts are now replaced with [deleted], to preserve thread structure and prevent re-fetching
Support for mention resolution through the parent post's recipients
followers, inbox and outbox now respond to GET requests by the owner
outbox now responds to POST requests by the owner
The application actor is now a portable actor named actor
Communities are created as portable actors
RFC9421 is enabled for future requests to the same server, when fetching an actor from a previously unknown server that advertises support for it through FEP-844e
Usage statistics in /nodeinfo/2.0 are now hidden when FillNodeInfoUsage is false

Removed

Users are created as portable actors, the portable vs. traditional choice is gone

Fix for broken validation of RFC9421 signatures that include @target-uri
Fix for broken mention resolution when the username contains -
Fix for bad implementation of FEP-844e for application actors
The number of database connections is now limited (MaxDatabaseConnections, defaults to 32) and slow sending to the client no longer leaves database connections busy
Go and dependency updates