Add SQLAlchemy database setup with Todo model

- Add app/db/base.py with SQLAlchemy Base class
- Add app/db/session.py with SQLite database connection using absolute path
- Add app/models/todo.py with Todo model including all required fields
- Add empty __init__.py files for proper package structure

app/db/base.py

@@ -0,0 +1,19 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+# Database setup
+DB_DIR = Path("/app/storage/db")
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,13 @@
+from sqlalchemy.orm import Session
+from app.db.base import SessionLocal
+
+
+def get_db() -> Session:
+    """
+    Dependency to get database session.
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/todo.py

@@ -0,0 +1,15 @@
+from datetime import datetime
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime
+
+from app.db.base import Base
+
+
+class Todo(Base):
+    __tablename__ = "todos"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), nullable=False)
+    description = Column(Text, 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)

main.py

@@ -0,0 +1,65 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import JSONResponse
+from app.api.v1.api import api_router
+from app.core.config import settings
+
+# Create FastAPI app instance
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description="A simple Todo API built with FastAPI",
+    version="1.0.0",
+    openapi_url="/openapi.json",
+)
+
+# Add CORS middleware to allow all origins
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # Allow all origins
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix="/api/v1")
+
+
+@app.get("/")
+async def root():
+    """
+    Root endpoint that returns basic app information.
+    """
+    return JSONResponse(
+        content={
+            "title": settings.PROJECT_NAME,
+            "description": "A simple Todo API built with FastAPI",
+            "version": "1.0.0",
+            "documentation": "/docs",
+            "health_check": "/health"
+        }
+    )
+
+
+@app.get("/health")
+async def health_check():
+    """
+    Health check endpoint to report application status.
+    """
+    return JSONResponse(
+        content={
+            "status": "healthy",
+            "service": settings.PROJECT_NAME,
+            "version": "1.0.0"
+        }
+    )
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(
+        "main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=True
+    )

requirements.txt

@@ -0,0 +1,10 @@
+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+sqlalchemy==2.0.23
+alembic==1.12.1
+pydantic==2.5.0
+pydantic-settings==2.1.0
+python-multipart==0.0.6
+passlib[bcrypt]==1.7.4
+python-jose[cryptography]==3.3.0
+ruff==0.1.6