D9 — Tenant model uses HasDatabase (code-verified deviation from skill)
Architecture decision record, relocated verbatim from the retired single-file
docs/tenancy/decision log. Status, thematic clusters, and how to record a new ADR: the decision log index.
The skill says "remove HasDatabase", but dev-master's tenants:rls
(CreateUserWithRLSPolicies) calls tenancy()->model()->database() to build the RLS
user's connection config. The base Tenant model does not include HasDatabase, so
our App\Models\Tenant must implement TenantWithDatabase + use HasDatabase or
tenants:rls fails. This does not enable multi-DB — we register no CreateDatabase/
MigrateDatabase jobs; database() is used purely to derive the central connection
config for the shared RLS user.