diff --git a/muck/models/dbref.py b/muck/models/dbref.py
index afd3081..69d70db 100644
--- a/muck/models/dbref.py
+++ b/muck/models/dbref.py
@@ -1,4 +1,4 @@
-from sqlalchemy import Column, Integer, String, ForeignKey, Boolean, Enum as SQLEnum
+from sqlalchemy import Column, Integer, String, ForeignKey, Boolean, DateTime, JSON, Enum as SQLEnum, func
 from sqlalchemy.orm import relationship
 from crudkit.core.base import CRUDMixin, Base
 from enum import Enum
@@ -10,18 +10,42 @@ class ObjectType(str, Enum):
     PLAYER = "player"
     PROGRAM = "program"
 
+TYPE_SUFFIXES = {
+    ObjectType.ROOM: "R",
+    ObjectType.EXIT: "E",
+    ObjectType.PLAYER: "P",
+    ObjectType.PROGRAM: "F",
+    ObjectType.THING: "",
+}
+
 class Dbref(Base, CRUDMixin):
     __tablename__ = "dbref"
 
     type = Column(SQLEnum(ObjectType, name="object_type_enum"), nullable=False)
     name = Column(String, nullable=False)
+    props = Column(JSON, nullable=False, default={})
     is_deleted = Column(Boolean, nullable=False, default=False)
 
-    owner_id = Column(Integer, ForeignKey("dbref.id"))
-    location_id = Column(Integer, ForeignKey("dbref.id"))
+    last_used = Column(DateTime, nullable=False, default=func.now())
+    use_count = Column(Integer, nullable=False, default=0)
 
-    owner = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[owner_id])
-    location = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[location_id])
+    location_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    location = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[location_id], back_populates="contents")
+
+    contents = relationship("Dbref", backref="location", foreign_keys=location_id)
+    exits = relationship("Exit", backref="source", foreign_keys=location_id)
+
+    owner_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    owner = relationship("Player", remote_side=[CRUDMixin.id], foreign_keys=[owner_id])
+
+    creator_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    creator = relationship("Player", remote_side=[CRUDMixin.id], foreign_keys=[creator_id])
+
+    modifier_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    modifier = relationship("Player", remote_side=[CRUDMixin.id], foreign_keys=[modifier_id])
+
+    last_user_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    last_user = relationship("Player", remote_side=[CRUDMixin.id], foreign_keys=[last_user_id])
 
     __mapper_args__ = {
         "polymorphic_on": type,
@@ -29,11 +53,19 @@ class Dbref(Base, CRUDMixin):
     }
 
     def __str__(self):
-        return f"#{self.id} ({self.type}): {self.name}"
+        suffix = TYPE_SUFFIXES.get(self.type, "")
+        return f"#{self.id}{suffix}"
+
+    def __repr__(self):
+        suffix = TYPE_SUFFIXES.get(self.type, "")
+        return f"<Dbref #{self.id}{suffix}>"
 
     def is_type(self, *types: ObjectType) -> bool:
         return self.type in types
 
+    def display_type(self) -> str:
+        return self.type.value.upper()
+
     @property
     def is_room(self): return self.is_type(ObjectType.ROOM)
 
diff --git a/muck/models/exit.py b/muck/models/exit.py
index 93acc66..a222bdc 100644
--- a/muck/models/exit.py
+++ b/muck/models/exit.py
@@ -1,6 +1,18 @@
+from sqlalchemy import Column, Integer, ForeignKey
+from sqlalchemy.orm import relationship
+
+from crudkit.core.base import CRUDMixin
+
 from muck.models.dbref import Dbref, ObjectType
 
 class Exit(Dbref):
+    __tablename__ = "exits"
+
+    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)
+
+    destination_id = Column(Integer, ForeignKey("dbref.id"), nullable=True)
+    destination = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[destination_id])
+
     __mapper_args__ = {
         "polymorphic_identity": ObjectType.EXIT
     }
diff --git a/muck/models/player.py b/muck/models/player.py
index 94d6f84..99a3b22 100644
--- a/muck/models/player.py
+++ b/muck/models/player.py
@@ -1,6 +1,26 @@
+from sqlalchemy import Column, Integer, Boolean, String, ForeignKey
+from sqlalchemy.orm import relationship
+
+from crudkit.core.base import CRUDMixin
+
 from muck.models.dbref import Dbref, ObjectType
 
 class Player(Dbref):
+    __tablename__ = "players"
+
+    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)
+
+    pennies = Column(Integer, nullable=False, default=0)
+    insert_mode = Column(Boolean, nullable=False, default=False)
+    block = Column(Integer, nullable=True)
+    password = Column(String, nullable=False)
+
+    home_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    home = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[home_id])
+
+    current_program_id = Column(Integer, ForeignKey("dbref.id"), nullable=True)
+    current_program = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[current_program_id])
+
     __mapper_args__ = {
         "polymorphic_identity": ObjectType.PLAYER
     }
diff --git a/muck/models/program.py b/muck/models/program.py
index 88e9403..b6f375f 100644
--- a/muck/models/program.py
+++ b/muck/models/program.py
@@ -1,6 +1,12 @@
+from sqlalchemy import Column, Integer, ForeignKey
+
 from muck.models.dbref import Dbref, ObjectType
 
 class Program(Dbref):
+    __tablename__ = "programs"
+
+    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)
+
     __mapper_args__ = {
         "polymorphic_identity": ObjectType.PROGRAM
     }
diff --git a/muck/models/room.py b/muck/models/room.py
index 4de1232..49d5469 100644
--- a/muck/models/room.py
+++ b/muck/models/room.py
@@ -1,6 +1,18 @@
+from sqlalchemy import Column, Integer, ForeignKey
+from sqlalchemy.orm import relationship
+
+from crudkit.core.base import CRUDMixin
+
 from muck.models.dbref import Dbref, ObjectType
 
 class Room(Dbref):
+    __tablename__ = "rooms"
+
+    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)
+
+    dropto_id = Column(Integer, ForeignKey("dbref.id"), nullable=True)
+    dropto = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[dropto_id])
+
     __mapper_args__ = {
         "polymorphic_identity": ObjectType.ROOM
     }
diff --git a/muck/models/thing.py b/muck/models/thing.py
index 3f5815a..1725208 100644
--- a/muck/models/thing.py
+++ b/muck/models/thing.py
@@ -1,6 +1,20 @@
+from sqlalchemy import Column, Integer, ForeignKey
+from sqlalchemy.orm import relationship
+
+from crudkit.core.base import CRUDMixin
+
 from muck.models.dbref import Dbref, ObjectType
 
 class Thing(Dbref):
+    __tablename__ = "things"
+
+    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)
+
+    value = Column(Integer, nullable=False, default=0)
+
+    home_id = Column(Integer, ForeignKey("dbref.id"), nullable=False)
+    home = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[home_id])
+
     __mapper_args__ = {
         "polymorphic_identity": ObjectType.THING
     }