first commit

backend/app/models/question.py

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+from pydantic import BaseModel
+from typing import List, Optional
+from datetime import datetime
+
+class QuestionItem(BaseModel):
+    question: str
+    expected_answer: str
+    hint: str
+    difficulty: Optional[str] = "Medium"
+    category: Optional[str] = "Technical"
+
+class QuestionSetIn(BaseModel):
+    resume_id: str
+    requirement_id: str
+
+class QuestionSetOut(BaseModel):
+    id: str
+    user_id: str
+    resume_id: str
+    requirement_id: str
+    questions: List[QuestionItem]
+    created_at: datetime