- Created app directory structure with db, models, and schemas modules
- Added SQLAlchemy Base class in app/db/base.py to prevent circular imports
- Implemented database session setup with SQLite configuration
- Created Todo model with id, title, description, completed, created_at, updated_at fields
- Added Pydantic schemas for TodoCreate, TodoUpdate, and TodoResponse
- Added requirements.txt with FastAPI, SQLAlchemy, and other dependencies
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