Update signprot model with on_delete
Update signprot model with on_delete

fosfataza/protwis,fosfataza/protwis,cmunk/protwis,fosfataza/protwis,protwis/protwis,protwis/protwis,protwis/protwis,cmunk/protwis,fosfataza/protwis,cmunk/protwis,cmunk/protwis