reassigning a domain to another site should reset site tag #12
Description
Given two sites:
- site A in production, sitea.com, has its "site" cache tag counter set to X
- site B, ready for production, siteb.pageboard.io, has its "site" cache tag counter set to Y
If a user removes site A data.domains and sets them to site B data.domains, it doesn't change X or Y: the cache has still old entries from site A.