Implement task management tool with FastAPI and SQLite

This commit includes: - Project structure and configuration - Database models for tasks, users, and categories - Authentication system with JWT - CRUD endpoints for tasks and categories - Search, filter, and sorting functionality - Health check endpoint - Alembic migration setup - Documentation
2025-06-03 07:48:27 +00:00 · 2025-06-03 07:48:27 +00:00 · 6f269066a5
commit 6f269066a5
parent 8e089d3b77
34 changed files with 1629 additions and 2 deletions
--- a/README.md
+++ b/README.md
@ -1,3 +1,134 @@
-# FastAPI Application
+# Task Management Tool

-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A robust task management application built with FastAPI and SQLite. The application allows users to create, organize, and track tasks with categories, priorities, and due dates.
+
+## Features
+
+- 🔐 User authentication (register, login)
+- ✅ Task management (create, read, update, delete)
+- 🏷️ Categories for organizing tasks
+- 🔍 Search, filter, and sorting functionality
+- 🎯 Priority levels for tasks
+- 📅 Due dates for tasks
+- 🔄 Task completion status tracking
+
+## Technology Stack
+
+- **Backend**: FastAPI
+- **Database**: SQLite with SQLAlchemy ORM
+- **Authentication**: JWT with OAuth2
+- **Migration**: Alembic
+- **Validation**: Pydantic
+- **Code Quality**: Ruff
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8 or higher
+- pip (Python package manager)
+
+### Installation
+
+1. Clone the repository:
+
+```bash
+git clone <repository-url>
+cd taskmanagementtool
+```
+
+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. Create a .env file based on .env.example:
+
+```bash
+cp .env.example .env
+```
+
+5. Run database migrations:
+
+```bash
+alembic upgrade head
+```
+
+### Running the Application
+
+Start the server with uvicorn:
+
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at http://localhost:8000
+
+### API Documentation
+
+Once the server is running, you can access:
+
+- Interactive API documentation: http://localhost:8000/docs
+- Alternative API documentation: http://localhost:8000/redoc
+- OpenAPI schema: http://localhost:8000/openapi.json
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/login` - Login and get access token
+
+### Users
+
+- `GET /api/v1/users/me` - Get current user info
+- `PUT /api/v1/users/me` - Update current user info
+
+### Tasks
+
+- `GET /api/v1/tasks` - List all tasks
+- `POST /api/v1/tasks` - Create a new task
+- `GET /api/v1/tasks/{task_id}` - Get a specific task
+- `PUT /api/v1/tasks/{task_id}` - Update a task
+- `DELETE /api/v1/tasks/{task_id}` - Delete a task
+
+### Categories
+
+- `GET /api/v1/categories` - List all categories
+- `POST /api/v1/categories` - Create a new category
+- `GET /api/v1/categories/{category_id}` - Get a specific category
+- `PUT /api/v1/categories/{category_id}` - Update a category
+- `DELETE /api/v1/categories/{category_id}` - Delete a category
+
+### Health Check
+
+- `GET /health` - Check application health status
+
+## Environment Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| SECRET_KEY | Secret key for JWT token generation | (See .env.example) |
+| ALGORITHM | Algorithm used for JWT | HS256 |
+| ACCESS_TOKEN_EXPIRE_MINUTES | Token expiration time in minutes | 30 |
+| BACKEND_CORS_ORIGINS | List of allowed CORS origins | [] |
+
+## Database Structure
+
+The application uses three main database models:
+
+1. **User** - Stores user information
+2. **Task** - Stores task details with references to users and categories
+3. **Category** - Stores category information with references to users
+
+## License
+
+This project is licensed under the MIT License - see the LICENSE file for details.
--- a/alembic.ini
+++ b/alembic.ini
@ -0,0 +1,110 @@
+# 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
+
+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
--- a/app/init.py
+++ b/app/init.py
--- a/app/api/init.py
+++ b/app/api/init.py
--- a/app/api/v1/init.py
+++ b/app/api/v1/init.py
--- a/app/api/v1/api.py
+++ b/app/api/v1/api.py
@ -0,0 +1,13 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import auth, categories, tasks, users
+
+api_router = APIRouter()
+
+# Include all router endpoints
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(tasks.router, prefix="/tasks", tags=["tasks"])
+api_router.include_router(
+    categories.router, prefix="/categories", tags=["categories"]
+)
--- a/app/api/v1/endpoints/init.py
+++ b/app/api/v1/endpoints/init.py
--- a/app/api/v1/endpoints/auth.py
+++ b/app/api/v1/endpoints/auth.py
@ -0,0 +1,75 @@
+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.core.config import settings
+from app.core.database import get_db
+from app.core.security import create_access_token
+from app.crud.user import (
+    authenticate_user,
+    create_user,
+    get_user_by_email,
+    get_user_by_username,
+)
+from app.schemas.token import Token
+from app.schemas.user import User, UserCreate
+
+router = APIRouter()
+
+
+@router.post("/register", response_model=User)
+def register(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserCreate,
+) -> Any:
+    """
+    Register a new user.
+    """
+    # Check if user with this email already exists
+    user = get_user_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists",
+        )
+
+    # Check if user with this username already exists
+    user = get_user_by_username(db, username=user_in.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this username already exists",
+        )
+
+    # Create new user
+    user = create_user(db, user_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 = 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)
+    return {
+        "access_token": create_access_token(
+            subject=str(user.id), expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
--- a/app/api/v1/endpoints/categories.py
+++ b/app/api/v1/endpoints/categories.py
@ -0,0 +1,123 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.core.deps import get_current_active_user
+from app.crud.category import (
+    create_category,
+    delete_category,
+    get_categories,
+    get_category_by_user,
+    update_category,
+)
+from app.models.user import User
+from app.schemas.category import Category, CategoryCreate, CategoryUpdate
+
+router = APIRouter()
+
+
+@router.get("", response_model=List[Category])
+def read_categories(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve categories for the current user.
+    """
+    categories = get_categories(
+        db=db, user_id=current_user.id, skip=skip, limit=limit
+    )
+    return categories
+
+
+@router.post("", response_model=Category)
+def create_category_endpoint(
+    *,
+    db: Session = Depends(get_db),
+    category_in: CategoryCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Create new category.
+    """
+    category = create_category(
+        db=db, category_in=category_in, user_id=current_user.id
+    )
+    return category
+
+
+@router.get("/{category_id}", response_model=Category)
+def read_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get specific category by ID.
+    """
+    category = get_category_by_user(
+        db=db, category_id=category_id, user_id=current_user.id
+    )
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    return category
+
+
+@router.put("/{category_id}", response_model=Category)
+def update_category_endpoint(
+    *,
+    db: Session = Depends(get_db),
+    category_id: int,
+    category_in: CategoryUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update a category.
+    """
+    category = get_category_by_user(
+        db=db, category_id=category_id, user_id=current_user.id
+    )
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    category = update_category(
+        db=db,
+        category_id=category_id,
+        category_in=category_in,
+        user_id=current_user.id,
+    )
+    return category
+
+
+@router.delete("/{category_id}", response_model=Category)
+def delete_category_endpoint(
+    *,
+    db: Session = Depends(get_db),
+    category_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Delete a category.
+    """
+    category = get_category_by_user(
+        db=db, category_id=category_id, user_id=current_user.id
+    )
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    category = delete_category(
+        db=db, category_id=category_id, user_id=current_user.id
+    )
+    return category
--- a/app/api/v1/endpoints/tasks.py
+++ b/app/api/v1/endpoints/tasks.py
@ -0,0 +1,121 @@
+from typing import Any, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.core.deps import get_current_active_user
+from app.crud.task import (
+    create_task,
+    delete_task,
+    get_task_by_user,
+    get_tasks,
+    update_task,
+)
+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(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    completed: Optional[bool] = None,
+    category_id: Optional[int] = None,
+    search: Optional[str] = None,
+    priority: Optional[str] = None,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve tasks for the current user.
+    """
+    tasks = get_tasks(
+        db=db,
+        user_id=current_user.id,
+        skip=skip,
+        limit=limit,
+        completed=completed,
+        category_id=category_id,
+        search=search,
+        priority=priority,
+    )
+    return tasks
+
+
+@router.post("", response_model=Task)
+def create_task_endpoint(
+    *,
+    db: Session = Depends(get_db),
+    task_in: TaskCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Create new task.
+    """
+    task = create_task(db=db, task_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 specific task by ID.
+    """
+    task = get_task_by_user(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_endpoint(
+    *,
+    db: Session = Depends(get_db),
+    task_id: int,
+    task_in: TaskUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update a task.
+    """
+    task = get_task_by_user(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 = update_task(
+        db=db, task_id=task_id, task_in=task_in, user_id=current_user.id
+    )
+    return task
+
+
+@router.delete("/{task_id}", response_model=Task)
+def delete_task_endpoint(
+    *,
+    db: Session = Depends(get_db),
+    task_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Delete a task.
+    """
+    task = get_task_by_user(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 = delete_task(db=db, task_id=task_id, user_id=current_user.id)
+    return task
--- a/app/api/v1/endpoints/users.py
+++ b/app/api/v1/endpoints/users.py
@ -0,0 +1,36 @@
+from typing import Any
+
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.core.deps import get_current_active_user
+from app.crud.user import update_user
+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_current_user(
+    current_user: UserModel = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+
+@router.put("/me", response_model=User)
+def update_current_user(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserUpdate,
+    current_user: UserModel = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update current user.
+    """
+    user = update_user(db, user_id=current_user.id, user_in=user_in)
+    return user
--- a/app/core/config.py
+++ b/app/core/config.py
@ -0,0 +1,35 @@
+from typing import List, Union
+
+from pydantic import AnyHttpUrl, Field, validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(
+        env_file=".env", env_file_encoding="utf-8", case_sensitive=True
+    )
+
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "Task Management Tool"
+
+    # SECURITY
+    SECRET_KEY: str = Field(
+        "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7",
+        description="Secret key for JWT token generation. Should be changed in production.",
+    )
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+
+    # CORS
+    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []
+
+    @validator("BACKEND_CORS_ORIGINS", pre=True)
+    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
+        if isinstance(v, str) and not v.startswith("["):
+            return [i.strip() for i in v.split(",")]
+        elif isinstance(v, (list, str)):
+            return v
+        raise ValueError(v)
+
+
+settings = Settings()
--- a/app/core/database.py
+++ b/app/core/database.py
@ -0,0 +1,28 @@
+from pathlib import Path
+
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+# Dependency to get the database session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
--- a/app/core/deps.py
+++ b/app/core/deps.py
@ -0,0 +1,51 @@
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.database import get_db
+from app.crud.user import get_user
+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:
+    """
+    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]
+        )
+        token_data = TokenPayload(**payload)
+    except JWTError as e:
+        raise credentials_exception from e
+
+    user = get_user(db, user_id=token_data.sub)
+    if not user:
+        raise credentials_exception
+
+    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=400, detail="Inactive user")
+
+    return current_user
--- a/app/core/security.py
+++ b/app/core/security.py
@ -0,0 +1,42 @@
+from datetime import datetime, timedelta
+from typing import Any, Optional, 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: Optional[timedelta] = None
+) -> str:
+    """
+    Create a JWT token for the given subject
+    """
+    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:
+    """
+    Verify plain password against hashed password
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password
+    """
+    return pwd_context.hash(password)
--- a/app/crud/init.py
+++ b/app/crud/init.py
@ -0,0 +1,49 @@
+from app.crud.category import (
+    create_category,
+    delete_category,
+    get_categories,
+    get_category,
+    get_category_by_user,
+    update_category,
+)
+from app.crud.task import (
+    create_task,
+    delete_task,
+    get_task,
+    get_task_by_user,
+    get_tasks,
+    update_task,
+)
+from app.crud.user import (
+    authenticate_user,
+    create_user,
+    delete_user,
+    get_user,
+    get_user_by_email,
+    get_user_by_username,
+    get_users,
+    update_user,
+)
+
+__all__ = [
+    "get_user",
+    "get_user_by_email",
+    "get_user_by_username",
+    "get_users",
+    "create_user",
+    "update_user",
+    "delete_user",
+    "authenticate_user",
+    "get_task",
+    "get_task_by_user",
+    "get_tasks",
+    "create_task",
+    "update_task",
+    "delete_task",
+    "get_category",
+    "get_category_by_user",
+    "get_categories",
+    "create_category",
+    "update_category",
+    "delete_category",
+]
--- a/app/crud/category.py
+++ b/app/crud/category.py
@ -0,0 +1,86 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.models.category import Category
+from app.schemas.category import CategoryCreate, CategoryUpdate
+
+
+def get_category(db: Session, category_id: int) -> Optional[Category]:
+    """
+    Get a category by ID
+    """
+    return db.query(Category).filter(Category.id == category_id).first()
+
+
+def get_category_by_user(
+    db: Session, category_id: int, user_id: int
+) -> Optional[Category]:
+    """
+    Get a category by ID for a specific user
+    """
+    return db.query(Category).filter(
+        Category.id == category_id, Category.owner_id == user_id
+    ).first()
+
+
+def get_categories(
+    db: Session, user_id: int, skip: int = 0, limit: int = 100
+) -> List[Category]:
+    """
+    Get all categories for a user
+    """
+    return db.query(Category).filter(
+        Category.owner_id == user_id
+    ).offset(skip).limit(limit).all()
+
+
+def create_category(
+    db: Session, category_in: CategoryCreate, user_id: int
+) -> Category:
+    """
+    Create a new category for a user
+    """
+    db_category = Category(
+        **category_in.dict(),
+        owner_id=user_id,
+    )
+    db.add(db_category)
+    db.commit()
+    db.refresh(db_category)
+    return db_category
+
+
+def update_category(
+    db: Session, category_id: int, category_in: CategoryUpdate, user_id: int
+) -> Optional[Category]:
+    """
+    Update a category
+    """
+    db_category = get_category_by_user(db, category_id, user_id)
+    if not db_category:
+        return None
+
+    update_data = category_in.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(db_category, field, value)
+
+    db.add(db_category)
+    db.commit()
+    db.refresh(db_category)
+    return db_category
+
+
+def delete_category(
+    db: Session, category_id: int, user_id: int
+) -> Optional[Category]:
+    """
+    Delete a category
+    """
+    db_category = get_category_by_user(db, category_id, user_id)
+    if not db_category:
+        return None
+
+    db.delete(db_category)
+    db.commit()
+    return db_category
--- a/app/crud/task.py
+++ b/app/crud/task.py
@ -0,0 +1,108 @@
+from typing import List, Optional
+
+from sqlalchemy import or_
+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_task_by_user(db: Session, task_id: int, user_id: int) -> Optional[Task]:
+    """
+    Get a task by ID for a specific user
+    """
+    return db.query(Task).filter(
+        Task.id == task_id, Task.owner_id == user_id
+    ).first()
+
+
+def get_tasks(
+    db: Session,
+    user_id: int,
+    skip: int = 0,
+    limit: int = 100,
+    completed: Optional[bool] = None,
+    category_id: Optional[int] = None,
+    search: Optional[str] = None,
+    priority: Optional[str] = None,
+) -> List[Task]:
+    """
+    Get all tasks for a user with optional filtering
+    """
+    query = db.query(Task).filter(Task.owner_id == user_id)
+
+    # Apply filters
+    if completed is not None:
+        query = query.filter(Task.is_completed == completed)
+
+    if category_id:
+        query = query.filter(Task.category_id == category_id)
+
+    if search:
+        search_term = f"%{search}%"
+        query = query.filter(
+            or_(
+                Task.title.ilike(search_term),
+                Task.description.ilike(search_term)
+            )
+        )
+
+    if priority:
+        query = query.filter(Task.priority == priority)
+
+    # Apply pagination and return results
+    return query.order_by(Task.created_at.desc()).offset(skip).limit(limit).all()
+
+
+def create_task(db: Session, task_in: TaskCreate, user_id: int) -> Task:
+    """
+    Create a new task for a user
+    """
+    db_task = Task(
+        **task_in.dict(),
+        owner_id=user_id,
+    )
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+
+def update_task(
+    db: Session, task_id: int, task_in: TaskUpdate, user_id: int
+) -> Optional[Task]:
+    """
+    Update a task
+    """
+    db_task = get_task_by_user(db, task_id, user_id)
+    if not db_task:
+        return None
+
+    update_data = task_in.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(db_task, field, value)
+
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+
+def delete_task(db: Session, task_id: int, user_id: int) -> Optional[Task]:
+    """
+    Delete a task
+    """
+    db_task = get_task_by_user(db, task_id, user_id)
+    if not db_task:
+        return None
+
+    db.delete(db_task)
+    db.commit()
+    return db_task
--- a/app/crud/user.py
+++ b/app/crud/user.py
@ -0,0 +1,99 @@
+from typing import Optional
+
+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_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_user_by_username(db: Session, username: str) -> Optional[User]:
+    """
+    Get a user by username
+    """
+    return db.query(User).filter(User.username == username).first()
+
+
+def get_users(db: Session, skip: int = 0, limit: int = 100):
+    """
+    Get multiple users with pagination
+    """
+    return db.query(User).offset(skip).limit(limit).all()
+
+
+def create_user(db: Session, user_in: UserCreate) -> User:
+    """
+    Create a new user
+    """
+    db_user = User(
+        email=user_in.email,
+        username=user_in.username,
+        hashed_password=get_password_hash(user_in.password),
+        is_active=True,
+    )
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+
+def update_user(db: Session, user_id: int, user_in: UserUpdate) -> Optional[User]:
+    """
+    Update a user
+    """
+    db_user = get_user(db, user_id)
+    if not db_user:
+        return None
+
+    update_data = user_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
+
+    for field, value in update_data.items():
+        setattr(db_user, field, value)
+
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+
+def delete_user(db: Session, user_id: int) -> Optional[User]:
+    """
+    Delete a user
+    """
+    db_user = get_user(db, user_id)
+    if not db_user:
+        return None
+
+    db.delete(db_user)
+    db.commit()
+    return db_user
+
+
+def authenticate_user(db: Session, email: str, password: str) -> Optional[User]:
+    """
+    Authenticate a user by email and password
+    """
+    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
--- a/app/models/init.py
+++ b/app/models/init.py
@ -0,0 +1,5 @@
+from app.models.category import Category
+from app.models.task import Task
+from app.models.user import User
+
+__all__ = ["User", "Task", "Category"]
--- a/app/models/category.py
+++ b/app/models/category.py
@ -0,0 +1,22 @@
+from sqlalchemy import Column, DateTime, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.core.database import Base
+
+
+class Category(Base):
+    __tablename__ = "categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False)
+    color = Column(String, default="#FFFFFF")  # Hexadecimal color code
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    # Foreign keys
+    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+
+    # Relationships
+    owner = relationship("User", back_populates="categories")
+    tasks = relationship("Task", back_populates="category")
--- a/app/models/task.py
+++ b/app/models/task.py
@ -0,0 +1,34 @@
+from sqlalchemy import (
+    Boolean,
+    Column,
+    DateTime,
+    ForeignKey,
+    Integer,
+    String,
+    Text,
+)
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.core.database import Base
+
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, index=True, nullable=False)
+    description = Column(Text, nullable=True)
+    is_completed = Column(Boolean, default=False)
+    due_date = Column(DateTime(timezone=True), nullable=True)
+    priority = Column(String, default="medium")  # low, medium, high
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    # Foreign keys
+    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    category_id = Column(Integer, ForeignKey("categories.id"), nullable=True)
+
+    # Relationships
+    owner = relationship("User", back_populates="tasks")
+    category = relationship("Category", back_populates="tasks")
--- a/app/models/user.py
+++ b/app/models/user.py
@ -0,0 +1,21 @@
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.core.database import Base
+
+
+class User(Base):
+    __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)
+    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())
+
+    # Relationships
+    tasks = relationship("Task", back_populates="owner")
+    categories = relationship("Category", back_populates="owner")
--- a/app/schemas/init.py
+++ b/app/schemas/init.py
@ -0,0 +1,18 @@
+from app.schemas.category import Category, CategoryCreate, CategoryUpdate
+from app.schemas.task import Task, TaskCreate, TaskUpdate
+from app.schemas.token import Token, TokenPayload
+from app.schemas.user import User, UserCreate, UserUpdate
+
+__all__ = [
+    "User",
+    "UserCreate",
+    "UserUpdate",
+    "Task",
+    "TaskCreate",
+    "TaskUpdate",
+    "Category",
+    "CategoryCreate",
+    "CategoryUpdate",
+    "Token",
+    "TokenPayload",
+]
--- a/app/schemas/category.py
+++ b/app/schemas/category.py
@ -0,0 +1,42 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# Shared properties
+class CategoryBase(BaseModel):
+    name: Optional[str] = None
+    color: Optional[str] = "#FFFFFF"
+
+
+# Properties to receive on category creation
+class CategoryCreate(CategoryBase):
+    name: str = Field(..., min_length=1, max_length=50)
+
+
+# Properties to receive on category update
+class CategoryUpdate(CategoryBase):
+    pass
+
+
+# Properties shared by models stored in DB
+class CategoryInDBBase(CategoryBase):
+    id: int
+    name: str
+    owner_id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Properties to return to client
+class Category(CategoryInDBBase):
+    pass
+
+
+# Properties stored in DB
+class CategoryInDB(CategoryInDBBase):
+    pass
--- a/app/schemas/task.py
+++ b/app/schemas/task.py
@ -0,0 +1,46 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# Shared properties
+class TaskBase(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    is_completed: Optional[bool] = False
+    due_date: Optional[datetime] = None
+    priority: Optional[str] = "medium"
+    category_id: Optional[int] = None
+
+
+# Properties to receive on task creation
+class TaskCreate(TaskBase):
+    title: str = Field(..., min_length=1, max_length=100)
+
+
+# Properties to receive on task update
+class TaskUpdate(TaskBase):
+    pass
+
+
+# Properties shared by models stored in DB
+class TaskInDBBase(TaskBase):
+    id: int
+    title: str
+    owner_id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Properties to return to client
+class Task(TaskInDBBase):
+    pass
+
+
+# Properties stored in DB
+class TaskInDB(TaskInDBBase):
+    pass
--- a/app/schemas/token.py
+++ b/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
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@ -0,0 +1,46 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr, Field
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    is_active: Optional[bool] = True
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    email: EmailStr
+    username: str
+    password: str = Field(..., min_length=8)
+
+
+# Properties to receive via API on update
+class UserUpdate(UserBase):
+    password: Optional[str] = Field(None, min_length=8)
+
+
+# Properties shared by models stored in DB
+class UserInDBBase(UserBase):
+    id: int
+    email: EmailStr
+    username: str
+    is_active: bool
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Properties to return via API
+class User(UserInDBBase):
+    pass
+
+
+# Properties stored in DB but not returned
+class UserInDB(UserInDBBase):
+    hashed_password: str
--- a/main.py
+++ b/main.py
@ -0,0 +1,37 @@
+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,
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set all CORS enabled origins
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+
+@app.get("/health", tags=["health"])
+async def health():
+    """
+    Health check endpoint.
+    Returns status of the application.
+    """
+    return {"status": "healthy"}
+
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
--- a/migrations/env.py
+++ b/migrations/env.py
@ -0,0 +1,98 @@
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# 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)
+
+# Import models for Alembic autogenerate support
+from app.core.database import Base
+from app.models import Category, Task, User
+
+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 do_run_migrations(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()
+
+
+async def run_async_migrations() -> None:
+    """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:
+        do_run_migrations(connection)
+
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        do_run_migrations(connection)
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/migrations/script.py.mako
+++ b/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"}
--- a/migrations/versions/0001_initial_migration.py
+++ b/migrations/versions/0001_initial_migration.py
@ -0,0 +1,79 @@
+"""Initial migration
+
+Revision ID: 0001
+Revises: None
+Create Date: 2023-12-15
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = '0001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # 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('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_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 categories table
+    op.create_table(
+        'categories',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('color', sa.String(), 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.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(['owner_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_categories_id'), 'categories', ['id'], unique=False)
+
+    # 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('is_completed', sa.Boolean(), nullable=True),
+        sa.Column('due_date', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('priority', sa.String(), 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.Integer(), nullable=False),
+        sa.Column('category_id', sa.Integer(), nullable=True),
+        sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
+        sa.ForeignKeyConstraint(['owner_id'], ['users.id'], ),
+        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() -> None:
+    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')
+    op.drop_index(op.f('ix_categories_id'), table_name='categories')
+    op.drop_table('categories')
+    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')
--- a/pyproject.toml
+++ b/pyproject.toml
@ -0,0 +1,25 @@
+[tool.ruff]
+target-version = "py310"
+line-length = 88
+
+[tool.ruff.lint]
+select = [
+    "E",  # pycodestyle errors
+    "W",  # pycodestyle warnings
+    "F",  # pyflakes
+    "I",  # isort
+    "C",  # flake8-comprehensions
+    "B",  # flake8-bugbear
+]
+ignore = [
+    "E501",  # line too long, handled by black
+    "B008",  # do not perform function calls in argument defaults
+    "C901",  # too complex
+]
+
+[tool.ruff.lint.per-file-ignores]
+"__init__.py" = ["F401"]
+"migrations/env.py" = ["E402", "F401"]
+
+[tool.ruff.lint.isort]
+known-third-party = ["fastapi", "pydantic", "sqlalchemy"]
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,11 @@
+fastapi>=0.105.0
+uvicorn>=0.24.0
+sqlalchemy>=2.0.23
+alembic>=1.12.1
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.6
+pydantic>=2.5.2
+pydantic-settings>=2.1.0
+python-dotenv>=1.0.0
+ruff>=0.1.6