Project: QGIS

Version: 3.0.0

Feature: Auxilliary Storage Support

A new tab is available in vector layer properties to manage auxiliary storage :

A new action Store data in the project is available in the data defined menu providing an easy way to manage auxiliary data for a property :

Auxiliary data is stored in a sqlite database and managed thanks to the OGR data provider (instead of the spatialite provider) to keep as small as possible the database file. This database file (with extension .qgd) is either saved just next to the project file or directly embedded within the new .qgz format.

See the original pull request and this article which explains more

This feature was developed by Paul Blottiere / Oslandia