Add tenant-aware user-engine behavior

src/user_engine/domain/__init__.py

@@ -23,6 +23,7 @@ from user_engine.domain.models import (
     ProfileValue,
     ProjectionType,
     Sensitivity,
+    TenantAccount,
     User,
     Visibility,
     new_id,
@@ -52,6 +53,7 @@ __all__ = [
     "ProfileValue",
     "ProjectionType",
     "Sensitivity",
+    "TenantAccount",
     "User",
     "Visibility",
     "new_id",

src/user_engine/domain/models.py

@@ -137,6 +137,14 @@ class Account:
     created_at: datetime = field(default_factory=utc_now)
 
 
+@dataclass(frozen=True)
+class TenantAccount:
+    user_id: str
+    tenant: str
+    status: AccountStatus = AccountStatus.ACTIVE
+    created_at: datetime = field(default_factory=utc_now)
+
+
 @dataclass(frozen=True)
 class ExternalIdentity:
     identity_id: str