v0.9.3-beta.4 — bugfix release

Bugfix release.

Fixed

• A backup failed with "cannot execute INSERT in a read-only transaction" on PostgreSQL as soon
  as the database dump filled a whole pack (32 MiB): the pack's index cache row was written
  inside the read-only dump transaction. On other databases that row was rolled back silently.
• Backups to a remote location slowed down as the repository grew: every backup step listed the
  repository's index with a round trip per file. Over SFTP to a Hetzner Storage Box a 60 GiB
  repository already lost a large part of each step to it; backing up continuously
  (occ backup:run) went from 45 KiB/s to 5.8 MB/s with the fix.

Package

ng_backup-0.9.3.tar.gz is the signed app store package (code-signed with the Nextcloud certificate for ng_backup); .sig is its app store signature.