Step 9：药品管理（IMP）

backend/app/models/imp_inventory.py

@@ -0,0 +1,20 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, Integer, UniqueConstraint, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base_class import Base
+
+
+class ImpInventory(Base):
+    __tablename__ = "imp_inventory"
+    __table_args__ = (UniqueConstraint("study_id", "site_id", "batch_id", name="uq_imp_inventory_site_batch"),)
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    study_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("studies.id"), index=True, nullable=False)
+    site_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("sites.id"), index=True, nullable=False)
+    batch_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("imp_batches.id"), index=True, nullable=False)
+    quantity_on_hand: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now())