Log updated data

[sfussenegger]

It would be great to have an optional log for updated data. This could be used to trigger further processing of updates. This could be something as simple as a CSV file in the form {table};{id};{action}, e.g. artist;4234;delete. There should probably be a dedicated log per update to allow processing files while updates are running.

I'm planning to add this feature myself anyway (never did any Python before though) but I thought that there might be some public interest and/or other suggestions on how to trigger actions on updated data.