文件版本管理-初步优化

backend/app/models/version_workflow.py

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+import enum
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, Enum, ForeignKey, Integer, UniqueConstraint, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base_class import Base
+
+
+class WorkflowStatus(str, enum.Enum):
+    PENDING = "PENDING"
+    APPROVED = "APPROVED"
+    REJECTED = "REJECTED"
+    CANCELED = "CANCELED"
+
+
+class VersionWorkflow(Base):
+    __tablename__ = "version_workflows"
+    __table_args__ = (UniqueConstraint("version_id", name="uq_version_workflow_version"),)
+
+    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)
+    template_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("workflow_templates.id"), nullable=False)
+    status: Mapped[WorkflowStatus] = mapped_column(
+        Enum(WorkflowStatus, name="workflow_status"),
+        nullable=False,
+        server_default=WorkflowStatus.PENDING.value,
+    )
+    current_node: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    submitted_by: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+    submitted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), 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(),
+    )
+
+    template = relationship("WorkflowTemplate")
+    version = relationship("DocumentVersion", back_populates="workflow_instance")
+    document = relationship("Document")
+    actions = relationship("WorkflowAction", back_populates="workflow", cascade="all, delete-orphan")