Implement Task Management Tool with FastAPI and SQLite

- Set up FastAPI project structure with API versioning
- Create database models for users and tasks
- Implement SQLAlchemy ORM with SQLite database
- Initialize Alembic for database migrations
- Create API endpoints for task management (CRUD)
- Create API endpoints for user management
- Add JWT authentication and authorization
- Add health check endpoint
- Add comprehensive README.md with API documentation

README.md

@@ -1,3 +1,113 @@
-# FastAPI Application
+# Task Management Tool
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI backend for managing tasks with user authentication and SQLite database.
+
+## Features
+
+- User registration and authentication with JWT tokens
+- Task management with CRUD operations
+- Task prioritization and status tracking
+- RESTful API with JSON responses
+- SQLite database with SQLAlchemy ORM
+- Database migrations with Alembic
+- Health check endpoint
+
+## API Endpoints
+
+### Health Check
+- `GET /health` - Check API health
+
+### User Management
+- `POST /users/register` - Register a new user
+- `POST /users/login` - Login and get access token
+- `GET /users/me` - Get current user info
+- `PUT /users/me` - Update current user info
+
+### Task Management
+- `GET /tasks` - List all tasks for current user
+- `POST /tasks` - Create a new task
+- `GET /tasks/{task_id}` - Get a specific task
+- `PUT /tasks/{task_id}` - Update a task
+- `DELETE /tasks/{task_id}` - Delete a task
+
+## Tech Stack
+
+- [FastAPI](https://fastapi.tiangolo.com/) - Modern, fast web framework for building APIs
+- [SQLAlchemy](https://www.sqlalchemy.org/) - SQL toolkit and Object-Relational Mapping
+- [Alembic](https://alembic.sqlalchemy.org/) - Database migration tool
+- [Pydantic](https://pydantic-docs.helpmanual.io/) - Data validation and settings management
+- [SQLite](https://www.sqlite.org/) - Lightweight relational database
+- [Python-Jose](https://python-jose.readthedocs.io/) - JavaScript Object Signing and Encryption (JOSE) implementation
+- [Passlib](https://passlib.readthedocs.io/) - Password hashing library
+
+## Setup and Installation
+
+### Prerequisites
+
+- Python 3.9+
+- pip (Python package installer)
+
+### Environment Setup
+
+1. Clone the repository:
+```bash
+git clone <repository-url>
+cd taskmanagementtool
+```
+
+2. Create and activate a virtual environment (optional but recommended):
+```bash
+python -m venv venv
+source venv/bin/activate  # On Windows: venv\Scripts\activate
+```
+
+3. Install dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+4. Set environment variables (optional, defaults are provided):
+```bash
+export SECRET_KEY="your-secret-key"
+export ACCESS_TOKEN_EXPIRE_MINUTES=30
+```
+
+### Database Setup
+
+1. Run Alembic migrations to set up the database:
+```bash
+alembic upgrade head
+```
+
+### Running the Application
+
+1. Start the FastAPI server:
+```bash
+uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+```
+
+2. Access the API documentation:
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+
+## Development
+
+### Adding Migrations
+
+When you modify the database models, create a new migration:
+
+```bash
+alembic revision --autogenerate -m "Description of changes"
+```
+
+### Applying Migrations
+
+To update your database to the latest schema:
+
+```bash
+alembic upgrade head
+```
+
+## API Documentation
+
+The API documentation is automatically generated and can be accessed at `/docs` or `/redoc` endpoints.

alembic.ini

@@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL with absolute path
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks=black
+# black.type=console_scripts
+# black.entrypoint=black
+# black.options=-l 79
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

app/api/deps.py

@@ -0,0 +1,54 @@
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.security import ALGORITHM
+from app.crud.user import get as get_user
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/users/login")
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    """
+    Get the current user from the token
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[ALGORITHM]
+        )
+        token_data = TokenPayload(**payload)
+    except (JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    user = get_user(db, user_id=int(token_data.sub))
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found"
+        )
+
+    return user
+
+def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
+    """
+    Get the current active user
+    """
+    if not current_user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+
+    return current_user

app/api/v1/api.py

@@ -0,0 +1,11 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import health, tasks, users
+
+# Create API router
+api_router = APIRouter()
+
+# Include routes from endpoint modules
+api_router.include_router(health.router, prefix="/health", tags=["health"])
+api_router.include_router(tasks.router, prefix="/tasks", tags=["tasks"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])

app/api/v1/endpoints/health.py

@@ -0,0 +1,24 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy import text
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+
+router = APIRouter()
+
+@router.get("", status_code=200)
+async def health_check(db: Session = Depends(get_db)):
+    """
+    Health check endpoint to verify API is running correctly
+    """
+    # Check database connection
+    try:
+        db.execute(text("SELECT 1"))
+        db_status = "healthy"
+    except Exception:
+        db_status = "unhealthy"
+
+    return {
+        "status": "ok",
+        "database": db_status
+    }

app/api/v1/endpoints/tasks.py

@@ -0,0 +1,101 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_active_user
+from app.crud import task as crud_task
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.task import Task, TaskCreate, TaskUpdate
+
+router = APIRouter()
+
+@router.get("", response_model=List[Task])
+def read_tasks(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve tasks for the current user.
+    """
+    tasks = crud_task.get_multi(
+        db=db, user_id=current_user.id, skip=skip, limit=limit
+    )
+    return tasks
+
+@router.post("", response_model=Task, status_code=status.HTTP_201_CREATED)
+def create_task(
+    *,
+    db: Session = Depends(get_db),
+    task_in: TaskCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Create a new task.
+    """
+    task = crud_task.create(db=db, obj_in=task_in, user_id=current_user.id)
+    return task
+
+@router.get("/{task_id}", response_model=Task)
+def read_task(
+    *,
+    db: Session = Depends(get_db),
+    task_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get task by ID.
+    """
+    task = crud_task.get(db=db, task_id=task_id, user_id=current_user.id)
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    return task
+
+@router.put("/{task_id}", response_model=Task)
+def update_task(
+    *,
+    db: Session = Depends(get_db),
+    task_id: int,
+    task_in: TaskUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update a task.
+    """
+    task = crud_task.get(db=db, task_id=task_id, user_id=current_user.id)
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    task = crud_task.update(db=db, db_obj=task, obj_in=task_in)
+    return task
+
+@router.delete(
+    "/{task_id}",
+    response_model=None,
+    status_code=status.HTTP_204_NO_CONTENT
+)
+def delete_task(
+    *,
+    db: Session = Depends(get_db),
+    task_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Delete a task.
+    """
+    task = crud_task.get(db=db, task_id=task_id, user_id=current_user.id)
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    crud_task.delete(db=db, task_id=task_id, user_id=current_user.id)
+    return None

app/api/v1/endpoints/users.py

@@ -0,0 +1,123 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_active_user
+from app.core.config import settings
+from app.core.security import create_access_token
+from app.crud import user as crud_user
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import Token
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserCreate, UserUpdate
+
+router = APIRouter()
+
+@router.post(
+    "/register",
+    response_model=UserSchema,
+    status_code=status.HTTP_201_CREATED
+)
+def create_user(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserCreate,
+) -> Any:
+    """
+    Create a new user.
+    """
+    # Check if user with given email exists
+    user = crud_user.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Email already registered"
+        )
+
+    # Check if user with given username exists
+    user = crud_user.get_by_username(db, username=user_in.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Username already taken"
+        )
+
+    # Create new user
+    user = crud_user.create(db, obj_in=user_in)
+    return user
+
+@router.post("/login", response_model=Token)
+def login_access_token(
+    db: Session = Depends(get_db),
+    form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests.
+    """
+    user = crud_user.authenticate(
+        db=db, username=form_data.username, password=form_data.password
+    )
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+@router.get("/me", response_model=UserSchema)
+def read_user_me(
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+@router.put("/me", response_model=UserSchema)
+def update_user_me(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update current user.
+    """
+    # Check if user is trying to update email and if email already exists
+    if user_in.email and user_in.email != current_user.email:
+        user = crud_user.get_by_email(db, email=user_in.email)
+        if user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered"
+            )
+
+    # Check if user is trying to update username and if username already exists
+    if user_in.username and user_in.username != current_user.username:
+        user = crud_user.get_by_username(db, username=user_in.username)
+        if user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Username already taken"
+            )
+
+    # Update user
+    user = crud_user.update(db, db_obj=current_user, obj_in=user_in)
+    return user

app/core/app.py

@@ -0,0 +1,39 @@
+from pathlib import Path
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.v1.api import api_router
+from app.core.config import settings
+
+
+def create_app() -> FastAPI:
+    """
+    Create and configure the FastAPI application
+    """
+    app = FastAPI(
+        title=settings.PROJECT_NAME,
+        description=settings.PROJECT_DESCRIPTION,
+        version=settings.PROJECT_VERSION,
+        openapi_url="/openapi.json",
+        docs_url="/docs",
+        redoc_url="/redoc",
+    )
+
+    # Add CORS middleware
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=["*"],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    # Include API router
+    app.include_router(api_router)
+
+    # Ensure DB directory exists
+    db_dir = Path(settings.DB_DIR)
+    db_dir.mkdir(parents=True, exist_ok=True)
+
+    return app

app/core/config.py

@@ -0,0 +1,31 @@
+import os
+from pathlib import Path
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """
+    Application settings
+    """
+    # Project info
+    PROJECT_NAME: str = "Task Management Tool"
+    PROJECT_DESCRIPTION: str = "A FastAPI backend for managing tasks"
+    PROJECT_VERSION: str = "0.1.0"
+
+    # Database settings
+    DB_DIR: Path = Path("/app/storage/db")
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+
+    # JWT settings
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "supersecretkey")
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = int(
+        os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "30")
+    )
+
+    # Configure Pydantic to read environment variables
+    model_config = SettingsConfigDict(
+        env_file=".env", env_file_encoding="utf-8", extra="ignore"
+    )
+
+settings = Settings()

app/core/security.py

@@ -0,0 +1,40 @@
+from datetime import datetime, timedelta
+from typing import Any, Optional
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+# Password hashing context
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# JWT settings
+ALGORITHM = "HS256"
+
+def create_access_token(subject: Any, expires_delta: Optional[timedelta] = None) -> str:
+    """
+    Create a JWT access token
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verify a password against a hash
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password
+    """
+    return pwd_context.hash(password)

app/crud/__init__.py

@@ -0,0 +1,32 @@
+# Re-export task operations
+from app.crud.task import create as create_task
+from app.crud.task import delete as delete_task
+from app.crud.task import get as get_task
+from app.crud.task import get_multi as get_tasks
+from app.crud.task import hard_delete as hard_delete_task
+from app.crud.task import update as update_task
+
+# Re-export user operations
+from app.crud.user import authenticate as authenticate_user
+from app.crud.user import create as create_user
+from app.crud.user import delete as delete_user
+from app.crud.user import get as get_user
+from app.crud.user import get_by_email as get_user_by_email
+from app.crud.user import get_by_username as get_user_by_username
+from app.crud.user import update as update_user
+
+__all__ = [
+    "create_task",
+    "delete_task",
+    "get_task",
+    "get_tasks",
+    "hard_delete_task",
+    "update_task",
+    "authenticate_user",
+    "create_user",
+    "delete_user",
+    "get_user",
+    "get_user_by_email",
+    "get_user_by_username",
+    "update_user",
+]

app/crud/task.py

@@ -0,0 +1,84 @@
+from typing import Any, Dict, List, Optional, Union
+
+from sqlalchemy import and_
+from sqlalchemy.orm import Session
+
+from app.models.task import Task
+from app.schemas.task import TaskCreate, TaskUpdate
+
+
+def get(db: Session, task_id: int, user_id: int) -> Optional[Task]:
+    """
+    Get a task by ID and user_id
+    """
+    return db.query(Task).filter(
+        and_(Task.id == task_id, Task.user_id == user_id, not Task.is_deleted)
+    ).first()
+
+def get_multi(
+    db: Session, user_id: int, skip: int = 0, limit: int = 100
+) -> List[Task]:
+    """
+    Get multiple tasks by user_id
+    """
+    return db.query(Task).filter(
+        and_(Task.user_id == user_id, not Task.is_deleted)
+    ).offset(skip).limit(limit).all()
+
+def create(db: Session, obj_in: TaskCreate, user_id: int) -> Task:
+    """
+    Create a new task
+    """
+    db_obj = Task(
+        **obj_in.model_dump(),
+        user_id=user_id
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+def update(
+    db: Session, db_obj: Task, obj_in: Union[TaskUpdate, Dict[str, Any]]
+) -> Task:
+    """
+    Update a task
+    """
+    if isinstance(obj_in, dict):
+        update_data = obj_in
+    else:
+        update_data = obj_in.model_dump(exclude_unset=True)
+
+    for field in update_data:
+        if hasattr(db_obj, field):
+            setattr(db_obj, field, update_data[field])
+
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+def delete(db: Session, task_id: int, user_id: int) -> bool:
+    """
+    Soft delete a task by setting is_deleted to True
+    """
+    task = get(db, task_id=task_id, user_id=user_id)
+    if not task:
+        return False
+
+    task.is_deleted = True
+    db.add(task)
+    db.commit()
+    return True
+
+def hard_delete(db: Session, task_id: int, user_id: int) -> bool:
+    """
+    Hard delete a task
+    """
+    task = get(db, task_id=task_id, user_id=user_id)
+    if not task:
+        return False
+
+    db.delete(task)
+    db.commit()
+    return True

app/crud/user.py

@@ -0,0 +1,90 @@
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+def get(db: Session, user_id: int) -> Optional[User]:
+    """
+    Get a user by ID
+    """
+    return db.query(User).filter(User.id == user_id).first()
+
+def get_by_email(db: Session, email: str) -> Optional[User]:
+    """
+    Get a user by email
+    """
+    return db.query(User).filter(User.email == email).first()
+
+def get_by_username(db: Session, username: str) -> Optional[User]:
+    """
+    Get a user by username
+    """
+    return db.query(User).filter(User.username == username).first()
+
+def create(db: Session, obj_in: UserCreate) -> User:
+    """
+    Create a new user
+    """
+    db_obj = User(
+        email=obj_in.email,
+        username=obj_in.username,
+        hashed_password=get_password_hash(obj_in.password),
+        full_name=obj_in.full_name,
+        is_active=obj_in.is_active
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+def update(
+    db: Session, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+) -> User:
+    """
+    Update a user
+    """
+    if isinstance(obj_in, dict):
+        update_data = obj_in
+    else:
+        update_data = obj_in.model_dump(exclude_unset=True)
+
+    if "password" in update_data and update_data["password"]:
+        hashed_password = get_password_hash(update_data["password"])
+        del update_data["password"]
+        update_data["hashed_password"] = hashed_password
+
+    for field in update_data:
+        if hasattr(db_obj, field):
+            setattr(db_obj, field, update_data[field])
+
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+def delete(db: Session, user_id: int) -> bool:
+    """
+    Delete a user by ID
+    """
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        return False
+
+    db.delete(user)
+    db.commit()
+    return True
+
+def authenticate(db: Session, username: str, password: str) -> Optional[User]:
+    """
+    Authenticate a user with username and password
+    """
+    user = get_by_username(db, username=username)
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user

app/db/session.py

@@ -0,0 +1,28 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Create SQLAlchemy engine
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+# Create sessionmaker
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Create Base class for models
+Base = declarative_base()
+
+# Dependency for getting DB session
+def get_db():
+    """
+    Dependency function that provides a SQLAlchemy session
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,4 @@
+from app.models.task import Task, TaskPriority, TaskStatus
+from app.models.user import User
+
+__all__ = ["Task", "TaskPriority", "TaskStatus", "User"]

app/models/task.py

@@ -0,0 +1,65 @@
+import enum
+
+from sqlalchemy import (
+    Boolean,
+    Column,
+    DateTime,
+    Enum,
+    ForeignKey,
+    Integer,
+    String,
+    Text,
+)
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class TaskPriority(str, enum.Enum):
+    """
+    Enum for task priority levels
+    """
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+
+
+class TaskStatus(str, enum.Enum):
+    """
+    Enum for task status
+    """
+    TODO = "todo"
+    IN_PROGRESS = "in_progress"
+    DONE = "done"
+
+
+class Task(Base):
+    """
+    Task model for storing task information
+    """
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, index=True, nullable=False)
+    description = Column(Text, nullable=True)
+    status = Column(Enum(TaskStatus), default=TaskStatus.TODO, nullable=False)
+    priority = Column(Enum(TaskPriority), default=TaskPriority.MEDIUM, nullable=False)
+    due_date = Column(DateTime(timezone=True), nullable=True)
+    is_deleted = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now()
+    )
+
+    # Foreign keys
+    user_id = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="CASCADE"),
+        nullable=False
+    )
+
+    # Relationships
+    user = relationship("User", backref="tasks")

app/models/user.py

@@ -0,0 +1,25 @@
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class User(Base):
+    """
+    User model for storing user information
+    """
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String, nullable=True)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now()
+    )

app/schemas/__init__.py

@@ -0,0 +1,17 @@
+from app.schemas.task import Task, TaskCreate, TaskPriority, TaskStatus, TaskUpdate
+from app.schemas.token import Token, TokenPayload
+from app.schemas.user import User, UserCreate, UserInDB, UserUpdate
+
+__all__ = [
+    "Task",
+    "TaskCreate",
+    "TaskUpdate",
+    "TaskStatus",
+    "TaskPriority",
+    "Token",
+    "TokenPayload",
+    "User",
+    "UserCreate",
+    "UserUpdate",
+    "UserInDB",
+]

app/schemas/task.py

@@ -0,0 +1,67 @@
+from datetime import datetime
+from enum import Enum
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict
+
+
+class TaskPriority(str, Enum):
+    """
+    Enum for task priority levels
+    """
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+
+class TaskStatus(str, Enum):
+    """
+    Enum for task status
+    """
+    TODO = "todo"
+    IN_PROGRESS = "in_progress"
+    DONE = "done"
+
+class TaskBase(BaseModel):
+    """
+    Base task schema with shared attributes
+    """
+    title: str
+    description: Optional[str] = None
+    status: TaskStatus = TaskStatus.TODO
+    priority: TaskPriority = TaskPriority.MEDIUM
+    due_date: Optional[datetime] = None
+
+class TaskCreate(TaskBase):
+    """
+    Schema for task creation
+    """
+    pass
+
+class TaskUpdate(BaseModel):
+    """
+    Schema for task updates
+    """
+    title: Optional[str] = None
+    description: Optional[str] = None
+    status: Optional[TaskStatus] = None
+    priority: Optional[TaskPriority] = None
+    due_date: Optional[datetime] = None
+    is_deleted: Optional[bool] = None
+
+class TaskInDBBase(TaskBase):
+    """
+    Base schema for tasks in DB with id and timestamps
+    """
+    id: int
+    user_id: int
+    created_at: datetime
+    updated_at: datetime
+    is_deleted: bool = False
+
+    model_config = ConfigDict(from_attributes=True)
+
+class Task(TaskInDBBase):
+    """
+    Schema for returning task information
+    """
+    pass

app/schemas/token.py

@@ -0,0 +1,17 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    """
+    Schema for token response
+    """
+    access_token: str
+    token_type: str
+
+class TokenPayload(BaseModel):
+    """
+    Schema for token payload
+    """
+    sub: Optional[str] = None

app/schemas/user.py

@@ -0,0 +1,53 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict, EmailStr, Field
+
+
+class UserBase(BaseModel):
+    """
+    Base user schema with shared attributes
+    """
+    email: EmailStr
+    username: str
+    full_name: Optional[str] = None
+    is_active: bool = True
+
+class UserCreate(UserBase):
+    """
+    Schema for user creation with password
+    """
+    password: str = Field(..., min_length=8)
+
+class UserUpdate(BaseModel):
+    """
+    Schema for user updates
+    """
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    full_name: Optional[str] = None
+    password: Optional[str] = Field(None, min_length=8)
+    is_active: Optional[bool] = None
+
+class UserInDBBase(UserBase):
+    """
+    Base schema for users in DB with id and timestamps
+    """
+    id: int
+    created_at: datetime
+    updated_at: datetime
+    is_superuser: bool = False
+
+    model_config = ConfigDict(from_attributes=True)
+
+class User(UserInDBBase):
+    """
+    Schema for returning user information
+    """
+    pass
+
+class UserInDB(UserInDBBase):
+    """
+    Schema with hashed password for internal use
+    """
+    hashed_password: str

main.py

@@ -0,0 +1,8 @@
+import uvicorn
+
+from app.core.app import create_app
+
+app = create_app()
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration with SQLite.

migrations/env.py

@@ -0,0 +1,79 @@
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# Import models for autogenerate support
+from app.db.session import Base
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == "sqlite"
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,  # Important for SQLite
+            compare_type=True,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/01_initial_tables.py

@@ -0,0 +1,99 @@
+"""Initial migration
+
+Revision ID: 01_initial_tables
+Revises:
+Create Date: 2023-10-20
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = '01_initial_tables'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Create users table
+    op.create_table(
+        'users',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('username', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True, default=True),
+        sa.Column('is_superuser', sa.Boolean(), nullable=True, default=False),
+        sa.Column(
+            'created_at',
+            sa.DateTime(timezone=True),
+            server_default=sa.text('(CURRENT_TIMESTAMP)'),
+            nullable=True
+        ),
+        sa.Column(
+            'updated_at',
+            sa.DateTime(timezone=True),
+            server_default=sa.text('(CURRENT_TIMESTAMP)'),
+            nullable=True
+        ),
+        sa.PrimaryKeyConstraint('id')
+    )
+
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+
+    # Create tasks table
+    op.create_table(
+        'tasks',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('title', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column(
+            'status',
+            sa.Enum('todo', 'in_progress', 'done', name='taskstatus'),
+            nullable=False,
+            default='todo'
+        ),
+        sa.Column(
+            'priority',
+            sa.Enum('low', 'medium', 'high', name='taskpriority'),
+            nullable=False,
+            default='medium'
+        ),
+        sa.Column('due_date', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('is_deleted', sa.Boolean(), nullable=True, default=False),
+        sa.Column(
+            'created_at',
+            sa.DateTime(timezone=True),
+            server_default=sa.text('(CURRENT_TIMESTAMP)'),
+            nullable=True
+        ),
+        sa.Column(
+            'updated_at',
+            sa.DateTime(timezone=True),
+            server_default=sa.text('(CURRENT_TIMESTAMP)'),
+            nullable=True
+        ),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('id')
+    )
+
+    op.create_index(op.f('ix_tasks_id'), 'tasks', ['id'], unique=False)
+    op.create_index(op.f('ix_tasks_title'), 'tasks', ['title'], unique=False)
+
+
+def downgrade():
+    # Drop tasks table
+    op.drop_index(op.f('ix_tasks_title'), table_name='tasks')
+    op.drop_index(op.f('ix_tasks_id'), table_name='tasks')
+    op.drop_table('tasks')
+
+    # Drop users table
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_table('users')

pyproject.toml

@@ -0,0 +1,17 @@
+[tool.ruff]
+line-length = 88
+indent-width = 4
+target-version = "py39"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "W"]
+ignore = []
+fixable = ["ALL"]
+unfixable = []
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+skip-magic-trailing-comma = false
+line-ending = "auto"

requirements.txt

@@ -0,0 +1,10 @@
+fastapi>=0.103.1
+uvicorn>=0.23.2
+sqlalchemy>=2.0.20
+alembic>=1.12.0
+pydantic>=2.4.0
+pydantic-settings>=2.0.3
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.6
+ruff>=0.0.292