Thank you for taking care of this issue. Unfortunately this seems to be a dead end in aptly usage on Debian as there is no migration method, and for the moment, not known, at least by me, method of recreating the database. The only solution that I can imagine is to use an old version of the package, 1.3.0-6, and pin it down until there is a actionable method.
- Bug#911924: aptly: Error decoding mirror: msgpack decode... Peter Felecan
- Bug#911924: Probably related to Go Codec change Matthias Hörmann
- Bug#911924: msgpack decode error Alexandre Viau
- Bug#911924: uploaded new version with warning Alexandre Viau
- Bug#911924: Acknowledgement (aptly: Error decoding ... Peter Felecan