Implement Task Manager API with FastAPI and SQLite

README.md

@@ -1,3 +1,133 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI-based Task Manager API with SQLite database and JWT authentication.
+
+## Features
+
+- User management (register, login, update profile)
+- Task management (create, read, update, delete)
+- Task assignment to other users
+- Task filtering by status
+- JWT authentication
+- Role-based access control (regular users and superusers)
+
+## Tech Stack
+
+- **Framework**: FastAPI
+- **Database**: SQLite with SQLAlchemy ORM
+- **Migrations**: Alembic
+- **Authentication**: JWT tokens (via python-jose)
+- **Password Hashing**: Bcrypt
+- **Validation**: Pydantic
+
+## Project Structure
+
+```
+├── app/
+│   ├── api/
+│   │   └── v1/
+│   │       ├── endpoints/
+│   │       │   ├── auth.py
+│   │       │   ├── tasks.py
+│   │       │   └── users.py
+│   │       └── api.py
+│   ├── core/
+│   │   ├── auth.py
+│   │   └── config.py
+│   ├── crud/
+│   │   ├── task.py
+│   │   └── user.py
+│   ├── db/
+│   │   ├── base_class.py
+│   │   ├── base.py
+│   │   └── session.py
+│   ├── models/
+│   │   ├── task.py
+│   │   └── user.py
+│   ├── schemas/
+│   │   ├── task.py
+│   │   ├── token.py
+│   │   └── user.py
+│   └── storage/
+│       └── db/
+├── migrations/
+│   └── versions/
+├── alembic.ini
+├── main.py
+├── README.md
+└── requirements.txt
+```
+
+## Environment Variables
+
+This application uses the following environment variables:
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| SECRET_KEY | JWT secret key | supersecretkey |
+| ACCESS_TOKEN_EXPIRE_MINUTES | JWT token expiration time in minutes | 60 |
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8 or higher
+
+### Installation
+
+1. Clone the repository
+
+2. Install dependencies
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. Run the application
+   ```bash
+   uvicorn main:app --reload
+   ```
+
+4. Access the API documentation
+   - Swagger UI: [http://localhost:8000/docs](http://localhost:8000/docs)
+   - ReDoc: [http://localhost:8000/redoc](http://localhost:8000/redoc)
+
+### Database Migrations
+
+Apply migrations to create the database schema:
+
+```bash
+alembic upgrade head
+```
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/token` - Login and get access token
+
+### Users
+
+- `GET /api/v1/users/me` - Get current user
+- `PUT /api/v1/users/me` - Update current user
+- `GET /api/v1/users/{user_id}` - Get user by ID
+- `GET /api/v1/users/` - List all users (superuser only)
+- `POST /api/v1/users/` - Create a new user (superuser only)
+- `PUT /api/v1/users/{user_id}` - Update a user (superuser only)
+
+### Tasks
+
+- `GET /api/v1/tasks/` - List tasks (with optional status filter)
+- `POST /api/v1/tasks/` - Create a new task
+- `GET /api/v1/tasks/{task_id}` - Get a task by ID
+- `PUT /api/v1/tasks/{task_id}` - Update a task
+- `DELETE /api/v1/tasks/{task_id}` - Delete a task
+- `POST /api/v1/tasks/{task_id}/assign/{user_id}` - Assign a task to a user
+
+### Health Check
+
+- `GET /health` - Check API health
+
+## License
+
+This project is licensed under the MIT License.

alembic.ini

@@ -0,0 +1,111 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# 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.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:migrations/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL - using absolute path as recommended
+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 REVISION_SCRIPT_FILENAME
+
+# 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/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/api/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/api/v1/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/api/v1/api.py

@@ -0,0 +1,9 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import tasks, users, auth
+
+api_router = APIRouter()
+
+api_router.include_router(auth.router, prefix="/auth", tags=["auth"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(tasks.router, prefix="/tasks", tags=["tasks"])

app/api/v1/endpoints/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/api/v1/endpoints/auth.py

@@ -0,0 +1,51 @@
+from datetime import timedelta
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.auth import authenticate_user, create_access_token
+from app.core.config import settings
+from app.schemas.token import Token
+from app.schemas.user import UserCreate, UserResponse
+from app.crud import user as crud_user
+
+router = APIRouter()
+
+@router.post("/token", response_model=Token)
+async def login_for_access_token(
+    form_data: OAuth2PasswordRequestForm = Depends(),
+    db: Session = Depends(get_db)
+):
+    """
+    OAuth2 compatible token login, get an access token for future requests.
+    """
+    user = authenticate_user(db, email=form_data.username, password=form_data.password)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        data={"sub": user.email}, expires_delta=access_token_expires
+    )
+    return {"access_token": access_token, "token_type": "bearer"}
+
+@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
+async def register_user(
+    user_in: UserCreate,
+    db: Session = Depends(get_db)
+):
+    """
+    Register a new user.
+    """
+    user = crud_user.get_user_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=400,
+            detail="The user with this email already exists in the system",
+        )
+    user = crud_user.create_user(db=db, obj_in=user_in)
+    return user

app/api/v1/endpoints/tasks.py

@@ -0,0 +1,120 @@
+from typing import List, Optional
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.models.user import User
+from app.core.auth import get_current_user
+from app.schemas.task import TaskCreate, TaskUpdate, TaskResponse
+from app.crud import task as crud_task
+
+router = APIRouter()
+
+@router.post("/", response_model=TaskResponse, status_code=status.HTTP_201_CREATED)
+def create_task(
+    task_in: TaskCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Create a new task for the current user.
+    """
+    task = crud_task.create_task(db=db, task_in=task_in, owner_id=current_user.id)
+    return task
+
+@router.get("/", response_model=List[TaskResponse])
+def read_tasks(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+    status: Optional[str] = None
+):
+    """
+    Retrieve all tasks for the current user.
+    Optional status filter available.
+    """
+    tasks = crud_task.get_tasks_by_owner(
+        db=db, 
+        owner_id=current_user.id, 
+        skip=skip, 
+        limit=limit,
+        status=status
+    )
+    return tasks
+
+@router.get("/{task_id}", response_model=TaskResponse)
+def read_task(
+    task_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Get a specific task by ID.
+    """
+    task = crud_task.get_task(db=db, task_id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    if task.owner_id != current_user.id and task.assigned_to_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Not enough permissions")
+    return task
+
+@router.put("/{task_id}", response_model=TaskResponse)
+def update_task(
+    task_id: int,
+    task_in: TaskUpdate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Update a task.
+    """
+    task = crud_task.get_task(db=db, task_id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    if task.owner_id != current_user.id and task.assigned_to_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Not enough permissions")
+    task = crud_task.update_task(db=db, db_obj=task, obj_in=task_in)
+    return task
+
+@router.delete("/{task_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_task(
+    task_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Delete a task.
+    """
+    task = crud_task.get_task(db=db, task_id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    if task.owner_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Not enough permissions")
+    crud_task.delete_task(db=db, task_id=task_id)
+    return None
+
+@router.post("/{task_id}/assign/{user_id}", response_model=TaskResponse)
+def assign_task(
+    task_id: int,
+    user_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Assign a task to another user.
+    """
+    task = crud_task.get_task(db=db, task_id=task_id)
+    if not task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    if task.owner_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Not enough permissions")
+    
+    # Check if user exists
+    from app.crud.user import get_user
+    user = get_user(db=db, user_id=user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    task = crud_task.assign_task(db=db, task_id=task_id, assigned_to_id=user_id)
+    return task

app/api/v1/endpoints/users.py

@@ -0,0 +1,105 @@
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.models.user import User
+from app.core.auth import get_current_user, get_current_active_superuser
+from app.schemas.user import UserCreate, UserUpdate, UserResponse
+from app.crud import user as crud_user
+
+router = APIRouter()
+
+@router.post("/", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
+def create_user(
+    user_in: UserCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_superuser)
+):
+    """
+    Create new user (superuser only).
+    """
+    user = crud_user.get_user_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=400,
+            detail="The user with this email already exists in the system."
+        )
+    user = crud_user.create_user(db=db, obj_in=user_in)
+    return user
+
+@router.get("/", response_model=List[UserResponse])
+def read_users(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_superuser)
+):
+    """
+    Retrieve users (superuser only).
+    """
+    users = crud_user.get_users(db, skip=skip, limit=limit)
+    return users
+
+@router.get("/me", response_model=UserResponse)
+def read_user_me(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Get current user.
+    """
+    return current_user
+
+@router.put("/me", response_model=UserResponse)
+def update_user_me(
+    user_in: UserUpdate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Update own user.
+    """
+    user = crud_user.update_user(db, db_obj=current_user, obj_in=user_in)
+    return user
+
+@router.get("/{user_id}", response_model=UserResponse)
+def read_user_by_id(
+    user_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
+):
+    """
+    Get a specific user by id.
+    """
+    user = crud_user.get_user(db, user_id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=404,
+            detail="The user with this ID does not exist in the system"
+        )
+    if user.id != current_user.id and not current_user.is_superuser:
+        raise HTTPException(
+            status_code=403,
+            detail="Not enough permissions"
+        )
+    return user
+
+@router.put("/{user_id}", response_model=UserResponse)
+def update_user(
+    user_id: int,
+    user_in: UserUpdate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_superuser)
+):
+    """
+    Update a user (superuser only).
+    """
+    user = crud_user.get_user(db, user_id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=404,
+            detail="The user with this ID does not exist in the system"
+        )
+    user = crud_user.update_user(db, db_obj=user, obj_in=user_in)
+    return user

app/core/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/core/auth.py

@@ -0,0 +1,107 @@
+from datetime import datetime, timedelta
+from typing import Optional
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.config import settings
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+# Password hashing
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# OAuth2 token URL
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/token")
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verify that a plain password matches a hashed password.
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password for storing in the database.
+    """
+    return pwd_context.hash(password)
+
+def authenticate_user(db: Session, email: str, password: str) -> Optional[User]:
+    """
+    Try to authenticate the user.
+    """
+    from app.crud.user import get_user_by_email
+    user = get_user_by_email(db, email=email)
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    """
+    Create JWT access token.
+    """
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme), 
+    db: Session = Depends(get_db)
+) -> User:
+    """
+    Get the current user from the token.
+    """
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
+        )
+        email: str = payload.get("sub")
+        if email is None:
+            raise credentials_exception
+        token_data = TokenPayload(email=email)
+    except JWTError:
+        raise credentials_exception
+    
+    from app.crud.user import get_user_by_email
+    user = get_user_by_email(db, email=token_data.email)
+    if user is None:
+        raise credentials_exception
+    return user
+
+async 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=400, detail="Inactive user")
+    return current_user
+
+async def get_current_active_superuser(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Get the current active superuser.
+    """
+    if not current_user.is_superuser:
+        raise HTTPException(
+            status_code=403, detail="The user doesn't have enough privileges"
+        )
+    return current_user

app/core/config.py

@@ -0,0 +1,25 @@
+import os
+from pathlib import Path
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "Task Manager API"
+    PROJECT_DESCRIPTION: str = "A FastAPI-based Task Manager API"
+    VERSION: str = "0.1.0"
+    
+    # Database
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+    
+    # Security
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "supersecretkey")
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "60"))
+    ALGORITHM: str = "HS256"
+    
+    model_config = SettingsConfigDict(env_file=".env", case_sensitive=True)
+
+# Create an instance of the Settings class
+settings = Settings()
+
+# Ensure DB directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)

app/crud/__init__.py

@@ -0,0 +1 @@
+# Import crud modules here to make them importable from 'app.crud'

app/crud/task.py

@@ -0,0 +1,90 @@
+from typing import List, Optional, Union, Dict, Any
+
+from sqlalchemy.orm import Session
+
+from app.models.task import Task
+from app.schemas.task import TaskCreate, TaskUpdate
+
+
+def get_task(db: Session, task_id: int) -> Optional[Task]:
+    """
+    Get a task by ID.
+    """
+    return db.query(Task).filter(Task.id == task_id).first()
+
+
+def get_tasks_by_owner(
+    db: Session, 
+    owner_id: int, 
+    skip: int = 0, 
+    limit: int = 100,
+    status: Optional[str] = None
+) -> List[Task]:
+    """
+    Get tasks by owner ID with optional status filter.
+    """
+    query = db.query(Task).filter(Task.owner_id == owner_id)
+    
+    if status:
+        query = query.filter(Task.status == status)
+        
+    return query.offset(skip).limit(limit).all()
+
+
+def create_task(db: Session, task_in: TaskCreate, owner_id: int) -> Task:
+    """
+    Create a new task.
+    """
+    task = Task(
+        **task_in.dict(),
+        owner_id=owner_id
+    )
+    db.add(task)
+    db.commit()
+    db.refresh(task)
+    return task
+
+
+def update_task(
+    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.dict(exclude_unset=True)
+    
+    for field, value in update_data.items():
+        if value is not None and hasattr(db_obj, field):
+            setattr(db_obj, field, value)
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def delete_task(db: Session, task_id: int) -> None:
+    """
+    Delete a task.
+    """
+    task = db.query(Task).filter(Task.id == task_id).first()
+    if task:
+        db.delete(task)
+        db.commit()
+
+
+def assign_task(db: Session, task_id: int, assigned_to_id: int) -> Task:
+    """
+    Assign a task to a user.
+    """
+    task = get_task(db, task_id=task_id)
+    task.assigned_to_id = assigned_to_id
+    db.add(task)
+    db.commit()
+    db.refresh(task)
+    return task

app/crud/user.py

@@ -0,0 +1,71 @@
+from typing import List, Optional, Union, Dict, Any
+
+from sqlalchemy.orm import Session
+
+from app.core.auth import get_password_hash
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+def get_user(db: Session, user_id: int) -> Optional[User]:
+    """
+    Get a user by ID.
+    """
+    return db.query(User).filter(User.id == user_id).first()
+
+
+def get_user_by_email(db: Session, email: str) -> Optional[User]:
+    """
+    Get a user by email.
+    """
+    return db.query(User).filter(User.email == email).first()
+
+
+def get_users(db: Session, skip: int = 0, limit: int = 100) -> List[User]:
+    """
+    Get multiple users.
+    """
+    return db.query(User).offset(skip).limit(limit).all()
+
+
+def create_user(db: Session, obj_in: UserCreate) -> User:
+    """
+    Create a new user.
+    """
+    db_obj = User(
+        email=obj_in.email,
+        hashed_password=get_password_hash(obj_in.password),
+        full_name=obj_in.full_name,
+        is_active=obj_in.is_active,
+        is_superuser=obj_in.is_superuser,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update_user(
+    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.dict(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, value in update_data.items():
+        if value is not None and hasattr(db_obj, field):
+            setattr(db_obj, field, value)
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj

app/db/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/db/base.py

@@ -0,0 +1,5 @@
+# Import all the models, so that Base has them before being
+# imported by Alembic
+from app.db.base_class import Base  # noqa
+from app.models.user import User  # noqa
+from app.models.task import Task  # noqa

app/db/base_class.py

@@ -0,0 +1,13 @@
+from typing import Any
+from sqlalchemy.ext.declarative import declared_attr
+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    id: Any
+    __name__: str
+    
+    # Generate __tablename__ automatically
+    @declared_attr
+    def __tablename__(cls) -> str:
+        return cls.__name__.lower()

app/db/session.py

@@ -0,0 +1,25 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Create SQLAlchemy engine
+engine = create_engine(
+    settings.DATABASE_URL,
+    connect_args={"check_same_thread": False}  # Needed for SQLite
+)
+
+# Create a SessionLocal class
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+# Dependency to get DB session
+def get_db():
+    """
+    Dependency function that yields db sessions
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/models/task.py

@@ -0,0 +1,36 @@
+from sqlalchemy import Column, Integer, String, Text, ForeignKey, DateTime, Enum
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+import enum
+
+from app.db.base_class import Base
+
+class TaskStatus(str, enum.Enum):
+    TODO = "todo"
+    IN_PROGRESS = "in_progress"
+    DONE = "done"
+
+class TaskPriority(str, enum.Enum):
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+
+class Task(Base):
+    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)
+    
+    # Foreign keys
+    owner_id = Column(Integer, ForeignKey("user.id"), nullable=False)
+    assigned_to_id = Column(Integer, ForeignKey("user.id"), nullable=True)
+    
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    # Relationships
+    owner = relationship("User", foreign_keys=[owner_id], back_populates="tasks_owned")
+    assigned_to = relationship("User", foreign_keys=[assigned_to_id], back_populates="tasks_assigned")

app/models/user.py

@@ -0,0 +1,20 @@
+from sqlalchemy import Boolean, Column, Integer, String, DateTime
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.base_class import Base
+
+
+class User(Base):
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    full_name = Column(String, nullable=True)
+    hashed_password = Column(String, nullable=False)
+    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), onupdate=func.now())
+
+    # Relationships
+    tasks_owned = relationship("Task", foreign_keys="Task.owner_id", back_populates="owner", cascade="all, delete-orphan")
+    tasks_assigned = relationship("Task", foreign_keys="Task.assigned_to_id", back_populates="assigned_to")

app/schemas/__init__.py

@@ -0,0 +1 @@
+# Empty __init__.py file to make the directory a Python package

app/schemas/task.py

@@ -0,0 +1,36 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, ConfigDict
+
+from app.models.task import TaskStatus, TaskPriority
+
+
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    status: TaskStatus = TaskStatus.TODO
+    priority: TaskPriority = TaskPriority.MEDIUM
+    due_date: Optional[datetime] = None
+
+
+class TaskCreate(TaskBase):
+    assigned_to_id: Optional[int] = None
+
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    status: Optional[TaskStatus] = None
+    priority: Optional[TaskPriority] = None
+    due_date: Optional[datetime] = None
+    assigned_to_id: Optional[int] = None
+
+
+class TaskResponse(TaskBase):
+    id: int
+    owner_id: int
+    assigned_to_id: Optional[int] = None
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    model_config = ConfigDict(from_attributes=True)

app/schemas/token.py

@@ -0,0 +1,12 @@
+from typing import Optional
+from pydantic import BaseModel, EmailStr
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    email: EmailStr = None
+    exp: Optional[int] = None

app/schemas/user.py

@@ -0,0 +1,30 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, EmailStr, ConfigDict
+
+
+class UserBase(BaseModel):
+    email: EmailStr
+    full_name: Optional[str] = None
+    is_active: bool = True
+    is_superuser: bool = False
+
+
+class UserCreate(UserBase):
+    password: str
+
+
+class UserUpdate(BaseModel):
+    email: Optional[EmailStr] = None
+    full_name: Optional[str] = None
+    password: Optional[str] = None
+    is_active: Optional[bool] = None
+    is_superuser: Optional[bool] = None
+
+
+class UserResponse(UserBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    model_config = ConfigDict(from_attributes=True)

main.py

@@ -0,0 +1,49 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.v1.api import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description=settings.PROJECT_DESCRIPTION,
+    version=settings.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 routers
+app.include_router(api_router, prefix="/api/v1")
+
+@app.get("/")
+async def root():
+    """
+    Root endpoint returning basic information about the service.
+    """
+    return {
+        "title": settings.PROJECT_NAME,
+        "description": settings.PROJECT_DESCRIPTION,
+        "docs": "/docs",
+        "health": "/health",
+    }
+
+@app.get("/health", tags=["health"])
+async def health_check():
+    """
+    Health check endpoint.
+    """
+    return {"status": "healthy", "version": settings.VERSION}
+
+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 +1,83 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+from app.db.base 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.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+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() -> None:
+    """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"},
+        render_as_batch=True,  # SQLite-specific configuration
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """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,  # SQLite-specific configuration
+        )
+
+        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 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

migrations/versions/1_initial_migration.py

@@ -0,0 +1,72 @@
+"""initial migration
+
+Revision ID: 1_initial_migration
+Revises: 
+Create Date: 2023-10-24 10:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '1_initial_migration'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create user table
+    op.create_table(
+        'user',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        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), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
+    op.create_index(op.f('ix_user_id'), 'user', ['id'], unique=False)
+
+    # Create task table with TaskStatus and TaskPriority enums
+    op.create_table(
+        'task',
+        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('owner_id', sa.Integer(), nullable=False),
+        sa.Column('assigned_to_id', sa.Integer(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['owner_id'], ['user.id'], ),
+        sa.ForeignKeyConstraint(['assigned_to_id'], ['user.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_task_id'), 'task', ['id'], unique=False)
+    op.create_index(op.f('ix_task_title'), 'task', ['title'], unique=False)
+
+
+def downgrade() -> None:
+    # Drop task table
+    op.drop_index(op.f('ix_task_title'), table_name='task')
+    op.drop_index(op.f('ix_task_id'), table_name='task')
+    op.drop_table('task')
+    
+    # Drop enums
+    op.execute('DROP TYPE IF EXISTS taskstatus')
+    op.execute('DROP TYPE IF EXISTS taskpriority')
+    
+    # Drop user table
+    op.drop_index(op.f('ix_user_id'), table_name='user')
+    op.drop_index(op.f('ix_user_email'), table_name='user')
+    op.drop_table('user')

requirements.txt

@@ -0,0 +1,20 @@
+# FastAPI and web server
+fastapi>=0.104.0
+uvicorn>=0.23.2
+
+# Database
+SQLAlchemy>=2.0.0
+alembic>=1.12.0
+
+# Authentication
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.6
+
+# Validation and serialization
+pydantic>=2.4.2
+pydantic-settings>=2.0.3
+email-validator>=2.0.0
+
+# Development and linting
+ruff>=0.1.0