Add default for existing rows in update schema
Add default for existing rows in update schema

- Modify update schema so that it sets the CloudComputeServiceID to 1 for
  existing rows in the CloudRecords table which matches the value for
  "None" in the lookup table. Otherwise the views appear empty as the
  records don't have a value for the ComputeService lookup.
- Add some comments.

stfc/apel,tofu-rocketry/apel,tofu-rocketry/apel,apel/apel,apel/apel,stfc/apel