[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2018-07-05.16:16:28]

This is now implemented by the conjunction of the following two modifications:

* New primitive in the Orthanc Database SDK (will be part of Orthanc 1.4.0): https://hg.orthanc-server.com/orthanc/changeset/e583478e0c6cd906e0cfa7afc58da7dabf881c49
* Refactored PostgreSQL plugin (will be released as Orthanc PostgreSQL 2.2): https://hg.orthanc-server.com/orthanc-databases/file/5a97c68a7a51da441ae94b6ab6681b2ea7aa8e80/Framework/Plugins/IndexBackend.cpp#L1078

A global official release in planned for July 2018.