fix(pyrog): restrict owner deletion

[simonvadee]

Fixes

The bug we discussed this morning with @tevariou : all columns and resources are deleted when the referenced owner is deleted (CASCADE behavior). Changed to on delete RESTRICT.

Description

Technical details

Definition of Done

• [x] I followed the Arkhn Code Book (I swear!).
• [x] I have written tests for the code I added or updated.
• [x] I have updated the documentation according to my changes.
• [x] I have updated the deployment configuration if needed.

Tests