diff --git a/crudkit/core/base.py b/crudkit/core/base.py
index 4618a85..3492dcb 100644
--- a/crudkit/core/base.py
+++ b/crudkit/core/base.py
@@ -1,5 +1,7 @@
-from sqlalchemy import Column, Integer, DateTime, func
-from sqlalchemy.orm import declarative_mixin
+from sqlalchemy import Column, Integer, DateTime, Boolean, func
+from sqlalchemy.orm import declarative_mixin, declarative_base
+
+Base = declarative_base()
 
 @declarative_mixin
 class CRUDMixin:
diff --git a/crudkit/core/service.py b/crudkit/core/service.py
index e82bec1..b240a60 100644
--- a/crudkit/core/service.py
+++ b/crudkit/core/service.py
@@ -4,17 +4,32 @@ from crudkit.core.spec import CRUDSpec
 
 T = TypeVar("T")
 
+def _is_truthy(val):
+    return str(val).lower() in ('1', 'true', 'yes', 'on')
+
 class CRUDService(Generic[T]):
     def __init__(self, model: Type[T], session: Session):
         self.model = model
         self.session = session
+        self.supports_soft_delete = hasattr(model, 'is_deleted')
 
-    def get(self, id: int) -> T:
-        return self.session.get(self.model, id)
+    def get(self, id: int, include_deleted: bool = False) -> T | None:
+        obj = self.session.get(self.model, id)
+        if obj is None:
+            return None
+        if self.supports_soft_delete and not include_deleted and obj.is_deleted:
+            return None
+        return obj
 
     def list(self, params=None) -> list[T]:
         query = self.session.query(self.model)
+
         if params:
+            if self.supports_soft_delete:
+                include_deleted = False
+                include_deleted = _is_truthy(params.get('include_deleted'))
+                if not include_deleted:
+                    query = query.filter(self.model.is_deleted == False)
             spec = CRUDSpec(self.model, params)
             filters = spec.parse_filters()
             order_by = spec.parse_sort()
@@ -41,12 +56,25 @@ class CRUDService(Generic[T]):
 
     def update(self, id: int, data: dict) -> T:
         obj = self.get(id)
+        if not obj:
+            raise ValueError(f"{self.model.__name__} with ID {id} not found.")
+
+        valid_fields = {c.name for c in self.model.__table__.columns}
         for k, v in data.items():
-            setattr(obj, k, v)
+            if k in valid_fields:
+                setattr(obj, k, v)
         self.session.commit()
         return obj
 
-    def delete(self, id: int):
-        obj = self.get(id)
-        self.session.delete(obj)
+    def delete(self, id: int, hard: bool = False):
+        obj = self.session.get(self.model, id)
+        if not obj:
+            return None
+
+        if hard or not self.supports_soft_delete:
+            self.session.delete(obj)
+        else:
+            obj.is_deleted = True
+
         self.session.commit()
+        return obj
diff --git a/muck/models/dbref.py b/muck/models/dbref.py
new file mode 100644
index 0000000..493fcbb
--- /dev/null
+++ b/muck/models/dbref.py
@@ -0,0 +1,23 @@
+from sqlalchemy import Column, Integer, String, ForeignKey
+from sqlalchemy.orm import relationship
+from crudkit.core.base import CRUDMixin, Base
+
+class Dbref(Base, CRUDMixin):
+    __tablename__ = "dbref"
+
+    type = Column(String, nullable=False)
+    name = Column(String, nullable=False)
+
+    owner_id = Column(Integer, ForeignKey("dbref.id"))
+    location_id = Column(Integer, ForeignKey("dbref.id"))
+
+    owner = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[owner_id])
+    location = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[location_id])
+
+    __mapper_args__ = {
+        "polymorphic_on": type,
+        "polymorphic_identity": "dbref"
+    }
+
+    def __str__(self):
+        return f"#{self.id} ({self.type}): {self.name}"