Create basic FastAPI Todo app project structure

- Add requirements.txt with FastAPI, uvicorn, SQLAlchemy, alembic, python-multipart, and ruff
- Create main.py with FastAPI app setup including CORS configuration
- Set up app directory structure with api/, db/, models/, and schemas/ subdirectories
- Add basic root endpoint with app info and health check endpoint
- Configure CORS to allow all origins

app/models/__init__.py

@@ -1 +1,3 @@
-# Models package
+from .todo import Todo
+
+__all__ = ["Todo"]

app/models/todo.py

@@ -1,6 +1,5 @@
-from datetime import datetime
-from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime
-
+from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy.sql import func
 from app.db.base import Base
 
 
@@ -8,8 +7,8 @@ class Todo(Base):
     __tablename__ = "todos"
     
     id = Column(Integer, primary_key=True, index=True)
-    title = Column(String(255), nullable=False)
-    description = Column(Text, nullable=True)
+    title = Column(String, nullable=False)
+    description = Column(String, nullable=True)
     completed = Column(Boolean, default=False, nullable=False)
-    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
-    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())