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I would like to safely clean duplicate field revision data. This field_revision_(field_name) data not associated with nodes, but the relation entities.

I'm using the relation module. I'm bumping up against the problem outlined here: https://www.drupal.org/node/1530164

I have a lot of relations on my site linking different entities. My field_revision_endpoints table is growing quite large. The issue mentions as a work around, he uses a sql script to clear out the old revisions. I did some googling on info for deleting revisions, but I'll I have come up with is results relating to deleting node revisions.

Is it safe to simply delete rows out of field_revision_endpoints?

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  • How about using Field SQL norevisions? – pierostz Jan 2 '17 at 16:45
  • @pierostz: this looks promising, thanks! I'll give it a try and let you know if it works out for my situation. Maybe you could post it as an answer? – Pete Jan 3 '17 at 17:02
  • I am using it myself for the same reasons. Didn't have a problem until now. – pierostz Jan 3 '17 at 17:04
  • You are using it specifically to reduce the size of field_revision_endpoint? What problem have you run into? – Pete Jan 3 '17 at 17:07
  • Other revision tables growing big and shared hosting – pierostz Jan 3 '17 at 17:09
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The answer is no. I eventually had to circle back to this question and come up with a solution myself. The relation_revision table contains the relation + revision ids that match up to the field_revision_endpoints rows. Simply deleting rows from relation_revision would orphan the revision field data in field_revision_endpoint.

After poking around the relations issue queue, I found this patch which adds support for the Entity API's revision deletion mechanism.

Instead of patching the relations module, I used hook_entity_info_alter to register my own 'revision deletion callback' on the relation entity, which I based on the above patch and node_revision_delete(). I can now use the Entity API's entity_revision_delete() to cleanly remove the excess revisions in batches.

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