Step 9：药品管理（IMP）

backend/app/models/imp_batch.py

@@ -0,0 +1,25 @@
+import uuid
+from datetime import datetime, date
+
+from sqlalchemy import Date, DateTime, ForeignKey, String, UniqueConstraint, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base_class import Base
+
+
+class ImpBatch(Base):
+    __tablename__ = "imp_batches"
+    __table_args__ = (UniqueConstraint("study_id", "batch_no", "product_id", name="uq_imp_batch_no"),)
+
+    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)
+    product_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("imp_products.id"), index=True, nullable=False)
+    batch_no: Mapped[str] = mapped_column(String(100), nullable=False)
+    expiry_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    manufacture_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="ACTIVE")
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
+    )