Added on_delete parameter to foreign keys
Added on_delete parameter to foreign keys

msreis/SigNetSim,msreis/SigNetSim,vincent-noel/SigNetSim,msreis/SigNetSim,msreis/SigNetSim,vincent-noel/SigNetSim,vincent-noel/SigNetSim,vincent-noel/SigNetSim