1.0.0-beta.4, is migrated in place on first open and keeps its change
sequence. It is refused only while its outbox still holds signal operations, because signal routes
no longer exist. Other schema versions are not migrated.
Fix — for a schema 3 file with pending signal operations, let the SDK version that wrote it
drain the outbox, then upgrade. For any other version, run the SDK version that owns the state, or
start a fresh state and re-bootstrap the destination. A new state file is a new sequencer; see the
cold-start warning in the target’s logs.E2411
Google PubSub target — State schema version mismatch
The state file was written by a schema version of the target that this build cannot open. A
schema 3 file, written by