Implement FastAPI Temporal MVP pipeline

app/infra/db/models/asset.py

@@ -0,0 +1,31 @@
+"""Asset ORM model."""
+
+from typing import Any
+
+from sqlalchemy import Enum, ForeignKey, Integer, JSON, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.domain.enums import AssetType, WorkflowStepName
+from app.infra.db.base import Base, TimestampMixin
+
+
+class AssetORM(TimestampMixin, Base):
+    """Persisted generated asset."""
+
+    __tablename__ = "assets"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    order_id: Mapped[int] = mapped_column(ForeignKey("orders.id"), nullable=False, index=True)
+    asset_type: Mapped[AssetType] = mapped_column(
+        Enum(AssetType, native_enum=False),
+        nullable=False,
+    )
+    step_name: Mapped[WorkflowStepName | None] = mapped_column(
+        Enum(WorkflowStepName, native_enum=False),
+        nullable=True,
+    )
+    uri: Mapped[str] = mapped_column(String(500), nullable=False)
+    metadata_json: Mapped[dict[str, Any] | None] = mapped_column(JSON, nullable=True)
+
+    order = relationship("OrderORM", back_populates="assets")
+