Quick question about /changes and Recycle

General
1

Hello all,

Just wanted to confirm something about tracking changes with the /changes API endpoint.

When the database is set to “Recycle”, are the automated deletions tracked by /changes?

I don’t seem to be able to see this in my changes. I can’t seem to be able to filter by ChangeType (would this be a relevant feature?).

Thanks!

Sylvain

2

Hello Sylvain,

Actually, all changes related to a resource are deleted when the resource is deleted. The only way to catch a “DELETE” event is through a lua callback.

And, concerning the filtering of changes by type, the feature has already been implemented in the find-refactoring branch and will be part of 1.12.5.

Best regards,

Alain.

1 Like
3

Ah, thanks a lot for your prompt response, Alain!

Do you think it would make sense to enable a configurable change tracking for deleted datasets?

Great to hear that the filtering is nearly there :slight_smile: !

Best,

Sylvain

4

We have 2 issues with that:

  • DELETE changes would accumulate in the DB and consume space (that should not be an issue on a regular system but could be an issue when Orthanc is acting as a buffer/forwarder and is not keeping the data)
  • Right now, the Changes table has a foreign key to the Resources table with a cascading delete → we would have to change the DB schema which we prefer to avoid as much as possible

However, I understand the need for monitoring DELETE events e.g when you want to synchronize 2 Orthanc instances.
In this project, we are using a RabbitMQ queue to post the DELETE events from the lua callback in order to replicate the DELETE on the second Orthanc instances.

Hope this helps,

Alain