文件版本管理-初步优化

backend/app/models/distribution.py

@@ -0,0 +1,50 @@
+import enum
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, Enum, ForeignKey, String, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base_class import Base
+
+
+class DistributionTargetType(str, enum.Enum):
+    SITE = "SITE"
+    ROLE = "ROLE"
+    USER = "USER"
+
+
+class DistributionStatus(str, enum.Enum):
+    ACTIVE = "ACTIVE"
+    CLOSED = "CLOSED"
+
+
+class Distribution(Base):
+    __tablename__ = "distributions"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    document_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("documents.id"), nullable=False)
+    version_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("document_versions.id"), nullable=False)
+    target_type: Mapped[DistributionTargetType] = mapped_column(
+        Enum(DistributionTargetType, name="distribution_target_type"),
+        nullable=False,
+    )
+    target_id: Mapped[str] = mapped_column(String(50), nullable=False)
+    status: Mapped[DistributionStatus] = mapped_column(
+        Enum(DistributionStatus, name="distribution_status"),
+        nullable=False,
+        server_default=DistributionStatus.ACTIVE.value,
+    )
+    due_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    closed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    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())
+
+    document = relationship("Document")
+    version = relationship("DocumentVersion", back_populates="distributions")
+    acknowledgements = relationship(
+        "Acknowledgement",
+        back_populates="distribution",
+        cascade="all, delete-orphan",
+    )