Adding soft-delete support.

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}"