Step 4：评论 / 附件 / 审计日志

backend/app/schemas/attachment.py

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+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict
+
+
+class AttachmentRead(BaseModel):
+    id: uuid.UUID
+    filename: str
+    file_size: int
+    uploaded_by: uuid.UUID
+    uploaded_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)

backend/app/schemas/audit.py

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+import uuid
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict
+
+
+class AuditLogRead(BaseModel):
+    id: uuid.UUID
+    action: str
+    detail: Optional[str]
+    operator_id: uuid.UUID
+    operator_role: str
+    created_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)

backend/app/schemas/comment.py

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+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class CommentCreate(BaseModel):
+    content: str = Field(min_length=1)
+
+
+class CommentRead(BaseModel):
+    id: uuid.UUID
+    content: str
+    created_by: uuid.UUID
+    created_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)