[QGIS-Developer] Inserting provider filter just before PostGIS layer is loaded?

[Johannes Kröger (WhereGroup)]

Howdy!

I'd like to force a provider filter when a user adds a PostGIS layer and 
have it applied *before* any data is loaded. Setting it after the layer 
(and some of its big data) is loaded initially is not an option.

Is there a way to sneak in between "user clicked something in the GUI to 
load a table/query and QGIS will construct a QgsVectorLayer now" and 
"QGIS now talks to the PostGIS database to get the data for the new 
layer", maybe with a signal?

Something like a "layerAboutToBeLoaded" (like the opposite 
layerWillBeRemoved on 
https://qgis.org/pyqgis/master/core/QgsProject.html) basically. :o)

Cheers, Hannes

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