Is it so that currently there is no way to retrieve information about a single entry cached by hasher via its hashsum? I have to either rclone hashsum md5 hasher:path or rclone backend dump hasher:path and then grep the output. With a lot of entries this is suboptimal.
hasher is simple bolt database you can query using your own tools.
I certainly can. However, I was asking about something without maintenance overhead: knowing the location of the database, knowing its structure, installing some CLI tool (I am not aware of a shell which can natively query BoltDB – unlike e.g. SQLite).
I hear you:) but it is such a niche feature that unless you have a go at it and implement it I doubt anybody will do. Simply not much real life use case for it. You need it then DIY is only way.