Allow remove files that are NOT tagged with specific tag

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Feature request

Which Nextcloud Version are you currently using: 32.0.5

Is your feature request related to a problem? Please describe.

I've would like to use nextcloud for sharing temporary data with external teams which should be automatically removed after some time, unless tagged "do not remove". Current logic requires the opposite - to remove data, it has to be tagged.

Describe the solution you'd like

Allow to specify "files which has not tag XYZ" to remove after some time

Describe alternatives you've considered

I tried to create invisible tags "to keep" and "to expire" with automated tagging feature. But this feature/flow works only on "when file changes", but doesnt work when only file is tagged or untagged anytime...

Additional context

Start from the retention rule and tag-matching entry points in this JavaScript app; the payload does not name specific files or tests. Trace how tagged files are selected for removal and how automated tagging handles tag changes. Done means a rule can remove files lacking a specified tag while preserving files that have it, including when tags change without a file change.