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![](https://lemmy.ml/pictrs/image/2QNz7bkA1V.png)
It wouldn’t be difficult to write this script as a darktable plugin, but I imagine you’d struggle to convince the maintainers to merge code to allow for searching or categorising based on a custom metadata tag.
I’m less familiar with other programs, but I don’t see any of the proprietary options implementing this.
Different places have different laws