resolve warnings

src/ttfrog/db/manager.py

@@ -75,8 +75,9 @@ class SQLDatabaseManager:
         return base64.urlsafe_b64encode(sha1bytes.digest()).decode("ascii")[:10]
 
     def init(self):
-        self.session.configure(bind=self.engine)
         self.metadata.bind = self.engine
+        self.session.remove()
+        self.session.configure(bind=self.engine)
         self.metadata.create_all(self.engine)
 
     def dump(self, names: list = []):

src/ttfrog/db/schema/item.py

@@ -53,18 +53,20 @@ class Spell(Item):
     __tablename__ = "spell"
     __mapper_args__ = {"polymorphic_identity": ItemType.SPELL}
     id: Mapped[int] = mapped_column(ForeignKey("item.id"), primary_key=True, init=False)
+    item_type: Mapped[ItemType] = ItemType.SPELL
+
     level: Mapped[int] = mapped_column(nullable=False, info={"min": 0, "max": 9}, default=0)
     concentration: Mapped[bool] = mapped_column(default=False)
-    item_type: Mapped[ItemType] = mapped_column(default=ItemType.SPELL, init=False)
 
 
 class Weapon(Item):
     __tablename__ = "weapon"
     __mapper_args__ = {"polymorphic_identity": ItemType.WEAPON}
     id: Mapped[int] = mapped_column(ForeignKey("item.id"), primary_key=True, init=False)
+    item_type: Mapped[ItemType] = ItemType.WEAPON
+
     damage_die: Mapped[str] = mapped_column(nullable=False, default="1d6")
     damage_type: Mapped[DamageType] = mapped_column(nullable=False, default=DamageType.slashing)
-    item_type: Mapped[ItemType] = mapped_column(default=ItemType.WEAPON)
     attack_range: Mapped[int] = mapped_column(nullable=False, info={"min": 0}, default=0)
     attack_range_long: Mapped[int] = mapped_column(nullable=True, info={"min": 0}, default=None)
     targets: Mapped[int] = mapped_column(nullable=False, info={"min": 1}, default=1)
@@ -85,3 +87,17 @@ class Weapon(Item):
     @property
     def ranged(self):
         return self.attack_range > 0
+
+
+class Shield(Item):
+    __tablename__ = "shield"
+    __mapper_args__ = {"polymorphic_identity": ItemType.SHIELD}
+    id: Mapped[int] = mapped_column(ForeignKey("item.id"), primary_key=True, init=False)
+    item_type: Mapped[ItemType] = ItemType.SHIELD
+
+
+class Armor(Item):
+    __tablename__ = "armor"
+    __mapper_args__ = {"polymorphic_identity": ItemType.ARMOR}
+    id: Mapped[int] = mapped_column(ForeignKey("item.id"), primary_key=True, init=False)
+    item_type: Mapped[ItemType] = ItemType.ARMOR