Each file defines a Subscriber and their Devices
Each file depends on one or more specific Domains (from ../Domains/*.sql) and a ServiceDefinition/Template pair (from ../ServiceDefinition/*.sql).  This dependancy is documented-only, so it is up to the particular test-case to be implemented properly, otherwise the insert is likely to fail.

Each Subscriber contains an ID, which must be unique.
The latest assigned subscriber ID is: 3

Each Device contains an ID, which must be unique.
The latest assigned device ID is: 9


