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backend/models/asset.py

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+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Enum
+from sqlalchemy.orm import relationship, Query
+from sqlalchemy.sql import func
+from database import Base
+import enum
+
+
+class AssetCategory(str, enum.Enum):
+    CHARACTERS = "characters"
+    PROPS = "props"
+    SETS = "sets"
+    VEHICLES = "vehicles"
+
+
+class AssetStatus(str, enum.Enum):
+    NOT_STARTED = "not_started"
+    IN_PROGRESS = "in_progress"
+    ON_HOLD = "on_hold"
+    COMPLETED = "completed"
+    APPROVED = "approved"
+
+
+class Asset(Base):
+    __tablename__ = "assets"
+
+    id = Column(Integer, primary_key=True, index=True)
+    project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
+    name = Column(String, nullable=False, index=True)
+    description = Column(String)
+    category = Column(Enum(AssetCategory), nullable=False)
+    status = Column(Enum(AssetStatus), nullable=False, default=AssetStatus.NOT_STARTED)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+    
+    # Soft deletion columns
+    deleted_at = Column(DateTime(timezone=True), nullable=True)
+    deleted_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+
+    # Relationships
+    project = relationship("Project", back_populates="assets")
+    tasks = relationship("Task", back_populates="asset", cascade="all, delete-orphan")
+    deleted_by_user = relationship("User", foreign_keys=[deleted_by])
+
+    @property
+    def is_deleted(self) -> bool:
+        """Check if the asset is soft deleted."""
+        return self.deleted_at is not None
+
+    @classmethod
+    def query_active(cls, query: Query) -> Query:
+        """Filter query to exclude soft deleted assets."""
+        return query.filter(cls.deleted_at.is_(None))
+
+    @classmethod
+    def query_deleted(cls, query: Query) -> Query:
+        """Filter query to include only soft deleted assets."""
+        return query.filter(cls.deleted_at.isnot(None))
+
+    @classmethod
+    def query_all_including_deleted(cls, query: Query) -> Query:
+        """Return query without soft deletion filtering (for admin use)."""
+        return query
+
+    def __repr__(self):
+        return f"<Asset(id={self.id}, name='{self.name}', category='{self.category}')>"