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one or several technical parameters are modified in service description
service restore:
service has been reported to be down (for network issue) and a restoration is being requested
NB: service delete is sent to the renderer for deletion in the network. However, the service is not deleted in service database. Only its path is cleared since removed from the network.
service reversion:
return to nominal path is requested for a service previously rerouted/restored. This still requires to store nominal path. For a service being restored, only the new path path is stored (in the service model).
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