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backend/app/models/object.py

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+import uuid
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from sqlalchemy import DateTime, ForeignKey, String, Text, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base import Base
+
+if TYPE_CHECKING:
+    from app.models.box import Box
+    from app.models.object_photo import ObjectPhoto
+
+
+class InventoryObject(Base):
+    __tablename__ = "objects"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    inventory_number: Mapped[str] = mapped_column(String(128), unique=True, index=True, nullable=False)
+    name: Mapped[str] = mapped_column(String(255), nullable=False)
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    box_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("boxes.id", ondelete="SET NULL"), nullable=True, index=True
+    )
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+    box: Mapped["Box | None"] = relationship(back_populates="objects")
+    photos: Mapped[list["ObjectPhoto"]] = relationship(
+        back_populates="object", cascade="all, delete-orphan", order_by="ObjectPhoto.position"
+    )