文件版本管理-初步优化

backend/app/models/workflow_action.py

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+import enum
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, Enum, ForeignKey, Integer, Text, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base_class import Base
+
+
+class WorkflowActionType(str, enum.Enum):
+    SUBMIT = "SUBMIT"
+    APPROVE = "APPROVE"
+    REJECT = "REJECT"
+
+
+class WorkflowAction(Base):
+    __tablename__ = "workflow_actions"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    workflow_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("version_workflows.id"), nullable=False)
+    node_order: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    action: Mapped[WorkflowActionType] = mapped_column(
+        Enum(WorkflowActionType, name="workflow_action_type"),
+        nullable=False,
+    )
+    actor_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+    comment: Mapped[str | None] = mapped_column(Text, nullable=True)
+    acted_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
+
+    workflow = relationship("VersionWorkflow", back_populates="actions")