Implement task management tool with FastAPI and SQLite

README.md

@@ -1,3 +1,133 @@
-# FastAPI Application
+# Task Management Tool
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A RESTful API for managing tasks, built with FastAPI and SQLite.
+
+## Features
+
+- User registration and authentication with JWT
+- CRUD operations for tasks
+- Task filtering, sorting, and pagination
+- Health check endpoint
+
+## Requirements
+
+- Python 3.8+
+- Dependencies listed in `requirements.txt`
+
+## Environment Variables
+
+The application uses the following environment variables:
+
+- `SECRET_KEY` - Secret key for JWT token generation (default: a development key, must be changed in production)
+- `ACCESS_TOKEN_EXPIRE_MINUTES` - Expiration time for JWT tokens in minutes (default: 30)
+
+## Installation and Setup
+
+1. Clone the repository
+
+2. Create a virtual environment and activate it
+   ```bash
+   python -m venv venv
+   source venv/bin/activate  # On Windows: venv\Scripts\activate
+   ```
+
+3. Install dependencies
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+4. Run database migrations
+   ```bash
+   alembic upgrade head
+   ```
+
+5. Start the server
+   ```bash
+   uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+   ```
+
+## API Documentation
+
+The API documentation is available at `/docs` or `/redoc` when the server is running.
+
+### Base URL
+
+```
+http://localhost:8000/api/v1
+```
+
+### Authentication
+
+The API uses JWT for authentication. To obtain a token, send a POST request to `/api/v1/auth/login` with your email and password.
+
+```bash
+curl -X 'POST' \
+  'http://localhost:8000/api/v1/auth/login' \
+  -H 'Content-Type: application/x-www-form-urlencoded' \
+  -d 'username=your@email.com&password=yourpassword'
+```
+
+### Endpoints
+
+#### Authentication
+
+- `POST /auth/register` - Register a new user
+- `POST /auth/login` - Login and get access token
+
+#### Users
+
+- `GET /users/me` - Get current user information
+- `PUT /users/me` - Update current user information
+
+#### Tasks
+
+- `GET /tasks` - List all tasks (with optional filtering and sorting)
+- `POST /tasks` - Create a new task
+- `GET /tasks/{task_id}` - Get a specific task
+- `PUT /tasks/{task_id}` - Update a specific task
+- `DELETE /tasks/{task_id}` - Delete a specific task
+
+#### Filtering and Sorting Tasks
+
+Tasks can be filtered and sorted using query parameters:
+
+- `is_completed` - Filter by completion status (true/false)
+- `priority` - Filter by priority (1=Low, 2=Medium, 3=High)
+- `sort_by` - Sort by field (created_at, due_date, priority, title)
+- `sort_order` - Sort order (asc/desc)
+- `skip` - Number of items to skip (for pagination)
+- `limit` - Maximum number of items to return (for pagination)
+
+Example:
+```
+GET /tasks?is_completed=false&priority=3&sort_by=due_date&sort_order=asc&skip=0&limit=10
+```
+
+## Health Check
+
+The API provides a health check endpoint at `/health`.
+
+## Development
+
+### Running Tests
+
+```bash
+pytest
+```
+
+### Database Migrations
+
+Create a new migration:
+```bash
+alembic revision --autogenerate -m "Description of changes"
+```
+
+Apply migrations:
+```bash
+alembic upgrade head
+```
+
+Revert migrations:
+```bash
+alembic downgrade -1
+```

alembic.ini

@@ -0,0 +1,86 @@
+# 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 +1,43 @@
+
+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 verify_password
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+oauth2_scheme = OAuth2PasswordBearer(
+    tokenUrl=f"{settings.API_V1_STR}/auth/login"
+)
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.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 = db.query(User).filter(User.id == token_data.sub).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+def authenticate_user(db: Session, email: str, password: str) -> User:
+    user = db.query(User).filter(User.email == email).first()
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user

app/api/v1/api.py

@@ -0,0 +1,8 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import auth, tasks, users
+
+router = APIRouter()
+router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+router.include_router(users.router, prefix="/users", tags=["users"])
+router.include_router(tasks.router, prefix="/tasks", tags=["tasks"])

app/api/v1/endpoints/auth.py

@@ -0,0 +1,73 @@
+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 import crud
+from app.api import deps
+from app.core import security
+from app.core.config import settings
+from app.schemas.token import Token
+from app.schemas.user import User, UserCreate
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=Token)
+def login_access_token(
+    db: Session = Depends(deps.get_db),
+    form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests
+    """
+    user = crud.user.authenticate(
+        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"},
+        )
+    elif not crud.user.is_active(user):
+        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": security.create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/register", response_model=User)
+def register_new_user(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: UserCreate,
+) -> Any:
+    """
+    Create new user
+    """
+    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",
+        )
+    
+    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 registered",
+        )
+    
+    user = crud.user.create(db, obj_in=user_in)
+    return user

app/api/v1/endpoints/tasks.py

@@ -0,0 +1,118 @@
+from typing import Any, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, status
+from sqlalchemy.orm import Session
+
+from app import crud
+from app.api import deps
+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(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    is_completed: Optional[bool] = None,
+    priority: Optional[int] = Query(None, ge=1, le=3),
+    sort_by: str = Query("created_at", regex="^(created_at|due_date|priority|title)$"),
+    sort_order: str = Query("desc", regex="^(asc|desc)$"),
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Retrieve tasks for current user with optional filtering and sorting.
+    """
+    tasks = crud.task.get_multi_by_owner(
+        db=db,
+        owner_id=current_user.id,
+        skip=skip,
+        limit=limit,
+        is_completed=is_completed,
+        priority=priority,
+        sort_by=sort_by,
+        sort_order=sort_order
+    )
+    return tasks
+
+
+@router.post("/", response_model=Task)
+def create_task(
+    *,
+    db: Session = Depends(deps.get_db),
+    task_in: TaskCreate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Create new task.
+    """
+    task = crud.task.create_with_owner(db=db, obj_in=task_in, owner_id=current_user.id)
+    return task
+
+
+@router.get("/{task_id}", response_model=Task)
+def read_task(
+    *,
+    db: Session = Depends(deps.get_db),
+    task_id: str,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get task by ID.
+    """
+    task = crud.task.get_task_by_id_and_owner(
+        db=db, task_id=task_id, owner_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(deps.get_db),
+    task_id: str,
+    task_in: TaskUpdate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Update a task.
+    """
+    task = crud.task.get_task_by_id_and_owner(
+        db=db, task_id=task_id, owner_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}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_task(
+    *,
+    db: Session = Depends(deps.get_db),
+    task_id: str,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Delete a task.
+    """
+    task = crud.task.get_task_by_id_and_owner(
+        db=db, task_id=task_id, owner_id=current_user.id
+    )
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    crud.task.remove(db=db, id=task_id)
+    return None

app/api/v1/endpoints/users.py

@@ -0,0 +1,53 @@
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app import crud
+from app.api import deps
+from app.models.user import User as UserModel
+from app.schemas.user import User, UserUpdate
+
+router = APIRouter()
+
+
+@router.get("/me", response_model=User)
+def read_user_me(
+    current_user: UserModel = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+
+@router.put("/me", response_model=User)
+def update_user_me(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: UserUpdate,
+    current_user: UserModel = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Update own user.
+    """
+    # Check if email is being updated and if it's already in use
+    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 username is being updated and if it's already in use
+    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 registered"
+            )
+    
+    user = crud.user.update(db, db_obj=current_user, obj_in=user_in)
+    return user

app/core/config.py

@@ -0,0 +1,22 @@
+from pathlib import Path
+
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "Task Management Tool"
+    API_V1_STR: str = "/api/v1"
+    
+    # JWT Settings
+    SECRET_KEY: str = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"  # Change in production
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    
+    # For SQLite
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+        case_sensitive = True
+
+settings = Settings()

app/core/security.py

@@ -0,0 +1,26 @@
+from datetime import datetime, timedelta
+from typing import Any, Union
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def create_access_token(subject: Union[str, Any], expires_delta: timedelta = None) -> str:
+    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=settings.ALGORITHM)
+    return encoded_jwt
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)

app/crud/__init__.py

@@ -0,0 +1,4 @@
+from app.crud.crud_user import user
+from app.crud.crud_task import task
+
+__all__ = ["user", "task"]

app/crud/base.py

@@ -0,0 +1,66 @@
+from typing import Any, Dict, Generic, List, Optional, Type, TypeVar, Union
+
+from fastapi.encoders import jsonable_encoder
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.db.base_class import Base
+
+ModelType = TypeVar("ModelType", bound=Base)
+CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
+UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
+
+
+class CRUDBase(Generic[ModelType, CreateSchemaType, UpdateSchemaType]):
+    def __init__(self, model: Type[ModelType]):
+        """
+        CRUD object with default methods to Create, Read, Update, Delete (CRUD).
+
+        **Parameters**
+
+        * `model`: A SQLAlchemy model class
+        * `schema`: A Pydantic model (schema) class
+        """
+        self.model = model
+
+    def get(self, db: Session, id: Any) -> Optional[ModelType]:
+        return db.query(self.model).filter(self.model.id == id).first()
+
+    def get_multi(
+        self, db: Session, *, skip: int = 0, limit: int = 100
+    ) -> List[ModelType]:
+        return db.query(self.model).offset(skip).limit(limit).all()
+
+    def create(self, db: Session, *, obj_in: CreateSchemaType) -> ModelType:
+        obj_in_data = jsonable_encoder(obj_in)
+        db_obj = self.model(**obj_in_data)  # type: ignore
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self,
+        db: Session,
+        *,
+        db_obj: ModelType,
+        obj_in: Union[UpdateSchemaType, Dict[str, Any]]
+    ) -> ModelType:
+        obj_data = jsonable_encoder(db_obj)
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.dict(exclude_unset=True)
+        for field in obj_data:
+            if field in update_data:
+                setattr(db_obj, field, update_data[field])
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def remove(self, db: Session, *, id: Any) -> ModelType:
+        obj = db.query(self.model).get(id)
+        db.delete(obj)
+        db.commit()
+        return obj

app/crud/crud_task.py

@@ -0,0 +1,69 @@
+import uuid
+from typing import List, Optional
+
+from sqlalchemy import and_, asc, desc
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.task import Task
+from app.schemas.task import TaskCreate, TaskUpdate
+
+
+class CRUDTask(CRUDBase[Task, TaskCreate, TaskUpdate]):
+    def create_with_owner(
+        self, db: Session, *, obj_in: TaskCreate, owner_id: str
+    ) -> Task:
+        db_obj = Task(
+            id=str(uuid.uuid4()),
+            title=obj_in.title,
+            description=obj_in.description,
+            priority=obj_in.priority,
+            due_date=obj_in.due_date,
+            is_completed=obj_in.is_completed,
+            owner_id=owner_id,
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def get_multi_by_owner(
+        self, 
+        db: Session, 
+        *, 
+        owner_id: str, 
+        skip: int = 0, 
+        limit: int = 100,
+        is_completed: Optional[bool] = None,
+        priority: Optional[int] = None,
+        sort_by: str = "created_at",
+        sort_order: str = "desc"
+    ) -> List[Task]:
+        # Start with base query
+        query = db.query(Task).filter(Task.owner_id == owner_id)
+        
+        # Apply filters if provided
+        if is_completed is not None:
+            query = query.filter(Task.is_completed == is_completed)
+        
+        if priority is not None:
+            query = query.filter(Task.priority == priority)
+        
+        # Apply sorting
+        if sort_order.lower() == "asc":
+            query = query.order_by(asc(getattr(Task, sort_by)))
+        else:
+            query = query.order_by(desc(getattr(Task, sort_by)))
+        
+        # Apply pagination
+        return query.offset(skip).limit(limit).all()
+
+    def get_task_by_id_and_owner(
+        self, db: Session, *, task_id: str, owner_id: str
+    ) -> Optional[Task]:
+        return db.query(Task).filter(
+            and_(Task.id == task_id, Task.owner_id == owner_id)
+        ).first()
+
+
+task = CRUDTask(Task)

app/crud/crud_user.py

@@ -0,0 +1,57 @@
+import uuid
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.crud.base import CRUDBase
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+class CRUDUser(CRUDBase[User, UserCreate, UserUpdate]):
+    def get_by_email(self, db: Session, *, email: str) -> Optional[User]:
+        return db.query(User).filter(User.email == email).first()
+    
+    def get_by_username(self, db: Session, *, username: str) -> Optional[User]:
+        return db.query(User).filter(User.username == username).first()
+
+    def create(self, db: Session, *, obj_in: UserCreate) -> User:
+        db_obj = User(
+            id=str(uuid.uuid4()),
+            email=obj_in.email,
+            username=obj_in.username,
+            hashed_password=get_password_hash(obj_in.password),
+            is_active=obj_in.is_active,
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self, db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+    ) -> User:
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.dict(exclude_unset=True)
+        if update_data.get("password"):
+            hashed_password = get_password_hash(update_data["password"])
+            del update_data["password"]
+            update_data["hashed_password"] = hashed_password
+        return super().update(db, db_obj=db_obj, obj_in=update_data)
+
+    def authenticate(self, db: Session, *, email: str, password: str) -> Optional[User]:
+        user = self.get_by_email(db, email=email)
+        if not user:
+            return None
+        if not verify_password(password, user.hashed_password):
+            return None
+        return user
+
+    def is_active(self, user: User) -> bool:
+        return user.is_active
+
+
+user = CRUDUser(User)

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 +1,14 @@
+from typing import Any
+
+from sqlalchemy.ext.declarative import as_declarative, declared_attr
+
+
+@as_declarative()
+class Base:
+    id: Any
+    __name__: str
+    
+    # Generate __tablename__ automatically
+    @declared_attr
+    def __tablename__(cls) -> str:
+        return cls.__name__.lower()

app/db/session.py

@@ -0,0 +1,23 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Ensure the database directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{settings.DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Dependency to get DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/task.py

@@ -0,0 +1,22 @@
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.base_class import Base
+
+
+class Task(Base):
+    id = Column(String, primary_key=True, index=True)
+    title = Column(String, index=True, nullable=False)
+    description = Column(Text, nullable=True)
+    priority = Column(Integer, default=1, nullable=False)  # 1=Low, 2=Medium, 3=High
+    due_date = Column(DateTime(timezone=True), nullable=True)
+    is_completed = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    
+    # Foreign keys
+    owner_id = Column(String, ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
+    
+    # Relationships
+    owner = relationship("User", back_populates="tasks")

app/models/user.py

@@ -0,0 +1,18 @@
+from sqlalchemy import Boolean, Column, String, DateTime
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.base_class import Base
+
+
+class User(Base):
+    id = Column(String, 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)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    
+    # Relationship with tasks
+    tasks = relationship("Task", back_populates="owner", cascade="all, delete-orphan")

app/schemas/task.py

@@ -0,0 +1,47 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# Shared properties
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    priority: int = Field(1, ge=1, le=3)  # 1=Low, 2=Medium, 3=High
+    due_date: Optional[datetime] = None
+    is_completed: bool = False
+
+
+# Properties to receive via API on creation
+class TaskCreate(TaskBase):
+    pass
+
+
+# Properties to receive via API on update
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    priority: Optional[int] = Field(None, ge=1, le=3)
+    due_date: Optional[datetime] = None
+    is_completed: Optional[bool] = None
+
+
+class TaskInDBBase(TaskBase):
+    id: str
+    owner_id: str
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class Task(TaskInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class TaskInDB(TaskInDBBase):
+    pass

app/schemas/token.py

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

app/schemas/user.py

@@ -0,0 +1,43 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: EmailStr
+    username: str
+    is_active: Optional[bool] = True
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    password: str
+
+
+# Properties to receive via API on update
+class UserUpdate(BaseModel):
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    password: Optional[str] = None
+    is_active: Optional[bool] = None
+
+
+class UserInDBBase(UserBase):
+    id: str
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class User(UserInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class UserInDB(UserInDBBase):
+    hashed_password: str

main.py

@@ -0,0 +1,43 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api.v1.api import router as api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description="Task Management API",
+    version="0.1.0",
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set up CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+@app.get("/")
+async def root():
+    """Root endpoint that provides basic service information"""
+    return {
+        "title": settings.PROJECT_NAME,
+        "docs": f"{settings.API_V1_STR}/docs",
+        "health": "/health"
+    }
+
+@app.get("/health", status_code=200)
+async def health_check():
+    """Health check endpoint"""
+    return {"status": "healthy"}
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/env.py

@@ -0,0 +1,85 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import Base for metadata
+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,
+    )
+
+    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
+        )
+
+        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() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

migrations/versions/a1b2c3d4e5f6_initial_migration.py

@@ -0,0 +1,62 @@
+"""Initial migration
+
+Revision ID: a1b2c3d4e5f6
+Revises: 
+Create Date: 2023-11-09 12:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'a1b2c3d4e5f6'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create user table
+    op.create_table(
+        'user',
+        sa.Column('id', sa.String(), 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('is_active', sa.Boolean(), 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.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)
+    op.create_index(op.f('ix_user_username'), 'user', ['username'], unique=True)
+
+    # Create task table
+    op.create_table(
+        'task',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('title', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('priority', sa.Integer(), nullable=False, default=1),
+        sa.Column('due_date', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('is_completed', sa.Boolean(), 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.Column('owner_id', sa.String(), nullable=False),
+        sa.ForeignKeyConstraint(['owner_id'], ['user.id'], ondelete='CASCADE'),
+        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:
+    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')
+    op.drop_index(op.f('ix_user_username'), table_name='user')
+    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 +1,12 @@
+fastapi==0.104.1
+uvicorn==0.23.2
+sqlalchemy==2.0.23
+alembic==1.12.1
+pydantic==2.4.2
+pydantic-settings==2.0.3
+python-jose==3.3.0
+passlib==1.7.4
+python-multipart==0.0.6
+bcrypt==4.0.1
+email-validator==2.1.0
+ruff==0.1.3