First draft of ServiceInstance model

src/servala/core/models/service.py

@@ -404,3 +404,35 @@ class ServiceOffering(ServalaModelMixin, models.Model):
         return _("{service_name} at {provider_name}").format(
             service_name=self.service.name, provider_name=self.provider.name
         )
+
+
+class ServiceInstance(ServalaModelMixin, models.Model):
+    """
+    The source of truth for service instances is Kubernetes.
+    The Django model only contains metadata, all other information is queried
+    on the fly.
+    """
+
+    name = models.CharField(max_length=100, verbose_name=_("Name"))
+    organization = models.ForeignKey(
+        to="core.Organization",
+        on_delete=models.PROTECT,
+        verbose_name=_("Organization"),
+        related_name="service_instances",
+    )
+    created_by = models.ForeignKey(
+        to="core.User",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="created_service_instances",
+    )
+    context = models.ForeignKey(
+        to="core.ServiceOfferingControlPlane",
+        related_name="service_instances",
+        on_delete=models.PROTECT,
+    )
+
+    class Meta:
+        verbose_name = _("Service instance")
+        verbose_name_plural = _("Service instances")