personal-files instances should be named descriptively so that users can have some understanding of what they grant access to - in this case config-files is too generic. Also write access implies read so there is no need for listing read for $HOME/.maascli.db as you already have write for this.
Can this please be split into 2 separate personal-files plugs as follows:
plugs:
dot-maascli-db:
interface: personal-files
write:
- $HOME/.maascli.db
dot-local-share-juju:
interface: personal-files
read:
- $HOME/.local/share/juju
+1 from me for auto-connect to dot-maascli-db and dot-local-share-juju via personal-files as above.