Adding some pointers into the documentation, and as I realize
you're on the QGIS users mailing list, I'd suggest to also
consider contributing support for this procedure in the 
DBManager (core plugin) or the postgis topology editor plugin

Following, docs pointers

On Fri, Jan 20, 2017 at 11:37:02AM +0100, Sandro Santilli wrote:

> 1. Load the shapefile into a table

> 2. Create a topology

> 3. Add a TopoGeometry column to the table

> 4. Update the table setting the new column with toTopoGeom

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