first commit

backend/app/models/pronunciation.py

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+from pydantic import BaseModel
+from typing import List
+from datetime import datetime
+
+class PronunciationItem(BaseModel):
+    word: str
+    phonetic: str
+    syllables: List[str]
+    definition: str
+
+class PronunciationDB(PronunciationItem):
+    id: str
+    created_at: datetime