参与者管理- PD模块内容补充

backend/app/models/subject_pd.py

@@ -0,0 +1,28 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, String, Text, UniqueConstraint, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base_class import Base
+
+
+class SubjectPd(Base):
+    __tablename__ = "subject_pds"
+    __table_args__ = (UniqueConstraint("study_id", "pd_no", name="uq_subject_pds_study_pd_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)
+    subject_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("subjects.id"), index=True, nullable=False)
+    pd_no: Mapped[str] = mapped_column(String(64), nullable=False)
+    pd_type: Mapped[str] = mapped_column(String(100), nullable=False)
+    pd_level: Mapped[str] = mapped_column(String(20), nullable=False, server_default="GENERAL")
+    approval_status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="DRAFT")
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="OPEN")
+    created_by: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+    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()
+    )