Implement Small Business Inventory Management System

- Created FastAPI application with SQLite database
- Implemented models for inventory items, categories, suppliers, and transactions
- Added authentication system with JWT tokens
- Implemented CRUD operations for all models
- Set up Alembic for database migrations
- Added comprehensive API documentation
- Configured Ruff for code linting

README.md

@@ -1,3 +1,149 @@
-# FastAPI Application
+# Small Business Inventory Management System
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A robust API-based inventory management system built for small businesses using FastAPI and SQLite. This system helps businesses track inventory items, manage suppliers, categorize products, and record stock movements.
+
+## Features
+
+- **Item Management**: Create, update, delete, and search inventory items
+- **Category Management**: Organize items by categories
+- **Supplier Management**: Track suppliers for inventory items
+- **Stock Transactions**: Record stock-in and stock-out transactions
+- **User Authentication**: Secure API access with JWT authentication
+- **Low Stock Alerts**: Identify items with stock levels below reorder points
+- **Reporting**: Generate transaction reports for specific time periods
+
+## Technology Stack
+
+- **Backend**: Python 3.8+ with FastAPI
+- **Database**: SQLite with SQLAlchemy ORM
+- **Authentication**: JWT tokens with OAuth2
+- **API Documentation**: Swagger UI and ReDoc via OpenAPI
+- **Migrations**: Alembic for database schema versioning
+
+## API Documentation
+
+API documentation is available at:
+- Swagger UI: `/docs`
+- ReDoc: `/redoc`
+
+## Environment Variables
+
+The application uses the following environment variables:
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| SECRET_KEY | JWT secret key | super-secret-key-for-development-only |
+| ACCESS_TOKEN_EXPIRE_MINUTES | JWT token expiration time in minutes | 60 |
+
+## Installation and Setup
+
+### Prerequisites
+
+- Python 3.8 or higher
+- pip (Python package manager)
+
+### Installation Steps
+
+1. Clone the repository:
+   ```
+   git clone <repository-url>
+   cd small-business-inventory-management-system
+   ```
+
+2. Install dependencies:
+   ```
+   pip install -r requirements.txt
+   ```
+
+3. Run database migrations:
+   ```
+   alembic upgrade head
+   ```
+
+4. Start the application:
+   ```
+   uvicorn main:app --reload
+   ```
+
+The API will be available at http://localhost:8000
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/login` - Obtain JWT token
+- `POST /api/v1/auth/register` - Register new user
+- `GET /api/v1/auth/me` - Get current user info
+
+### Items
+
+- `GET /api/v1/items` - List all items (with optional filtering)
+- `POST /api/v1/items` - Create new item
+- `GET /api/v1/items/{item_id}` - Get item details
+- `PUT /api/v1/items/{item_id}` - Update item
+- `DELETE /api/v1/items/{item_id}` - Delete item
+- `GET /api/v1/items/search` - Search items by name, SKU, or barcode
+
+### Categories
+
+- `GET /api/v1/categories` - List all categories
+- `POST /api/v1/categories` - Create new category
+- `GET /api/v1/categories/{category_id}` - Get category details
+- `PUT /api/v1/categories/{category_id}` - Update category
+- `DELETE /api/v1/categories/{category_id}` - Delete category
+
+### Suppliers
+
+- `GET /api/v1/suppliers` - List all suppliers
+- `POST /api/v1/suppliers` - Create new supplier
+- `GET /api/v1/suppliers/{supplier_id}` - Get supplier details
+- `PUT /api/v1/suppliers/{supplier_id}` - Update supplier
+- `DELETE /api/v1/suppliers/{supplier_id}` - Delete supplier
+
+### Transactions
+
+- `GET /api/v1/transactions` - List all transactions (with optional filtering)
+- `POST /api/v1/transactions` - Create new transaction (stock in/out)
+- `GET /api/v1/transactions/{transaction_id}` - Get transaction details
+- `PUT /api/v1/transactions/{transaction_id}` - Update transaction metadata
+- `GET /api/v1/transactions/by-item/{item_id}` - Get item transactions
+- `GET /api/v1/transactions/report/daily` - Get daily transaction report
+
+## Data Models
+
+### User
+- Username, email, password, full name
+- Active status and superuser privileges
+
+### Item
+- Name, description, SKU, barcode
+- Quantity, unit price, reorder level
+- Associated category and supplier
+
+### Category
+- Name and description
+
+### Supplier
+- Name, contact info (name, email, phone, address)
+
+### Transaction
+- Associated item and user
+- Quantity, unit price, total price
+- Transaction type (stock in/out)
+- Reference, notes, timestamp
+
+## Development
+
+### Adding Database Migrations
+
+When you make changes to the database models, generate new migrations with:
+
+```
+alembic revision --autogenerate -m "Description of changes"
+```
+
+Then apply the migrations:
+
+```
+alembic upgrade head
+```

alembic.ini

@@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL - using 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 +1,3 @@
+from app.db.deps import get_current_user, get_db
+
+__all__ = ["get_db", "get_current_user"]

app/api/v1/api.py

@@ -0,0 +1,11 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import auth, categories, items, suppliers, transactions
+
+api_router = APIRouter()
+
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(items.router, prefix="/items", tags=["items"])
+api_router.include_router(categories.router, prefix="/categories", tags=["categories"])
+api_router.include_router(suppliers.router, prefix="/suppliers", tags=["suppliers"])
+api_router.include_router(transactions.router, prefix="/transactions", tags=["transactions"])

app/api/v1/endpoints/auth.py

@@ -0,0 +1,90 @@
+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.config import settings
+from app.core.security import create_access_token
+from app.models.user import User
+from app.schemas.token import Token
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserCreate
+
+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, username=form_data.username, password=form_data.password
+    )
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    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": create_access_token(
+            user.username, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/register", response_model=UserSchema, status_code=status.HTTP_201_CREATED)
+def register_user(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: UserCreate,
+) -> Any:
+    """
+    Register a new user.
+    """
+    # Check if user with the same email already exists
+    user = crud.user.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="User with this email already exists",
+        )
+    
+    # Check if user with the same username already exists
+    user = crud.user.get_by_username(db, username=user_in.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="User with this username already exists",
+        )
+    
+    # Create new user (non-superuser by default)
+    user_in.is_superuser = False
+    user = crud.user.create(db, obj_in=user_in)
+    return user
+
+
+@router.get("/me", response_model=UserSchema)
+def read_users_me(
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get current user information.
+    """
+    return current_user

app/api/v1/endpoints/categories.py

@@ -0,0 +1,126 @@
+from typing import Any, List
+
+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
+from app.schemas.category import Category, CategoryCreate, CategoryUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Category])
+def read_categories(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Retrieve categories.
+    """
+    categories = crud.category.get_multi(db, skip=skip, limit=limit)
+    return categories
+
+
+@router.post("/", response_model=Category, status_code=status.HTTP_201_CREATED)
+def create_category(
+    *,
+    db: Session = Depends(deps.get_db),
+    category_in: CategoryCreate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Create new category.
+    """
+    # Check if category with the same name already exists
+    category = crud.category.get_by_name(db, name=category_in.name)
+    if category:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Category with this name already exists",
+        )
+    
+    category = crud.category.create(db, obj_in=category_in)
+    return category
+
+
+@router.get("/{category_id}", response_model=Category)
+def read_category(
+    *,
+    db: Session = Depends(deps.get_db),
+    category_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get category by ID.
+    """
+    category = crud.category.get(db, id=category_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(
+    *,
+    db: Session = Depends(deps.get_db),
+    category_id: int,
+    category_in: CategoryUpdate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Update a category.
+    """
+    category = crud.category.get(db, id=category_id)
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    
+    # Check if name is being changed and if it already exists
+    if category_in.name and category_in.name != category.name:
+        existing_category = crud.category.get_by_name(db, name=category_in.name)
+        if existing_category and existing_category.id != category_id:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Category with this name already exists",
+            )
+    
+    category = crud.category.update(db, db_obj=category, obj_in=category_in)
+    return category
+
+
+@router.delete("/{category_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_category(
+    *,
+    db: Session = Depends(deps.get_db),
+    category_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Delete a category.
+    """
+    category = crud.category.get(db, id=category_id)
+    if not category:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Category not found",
+        )
+    
+    # Check if any items are using this category
+    items = crud.item.get_by_category(db, category_id=category_id, skip=0, limit=1)
+    if items:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot delete category with associated items",
+        )
+    
+    crud.category.remove(db, id=category_id)
+    return None

app/api/v1/endpoints/items.py

@@ -0,0 +1,212 @@
+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.item import Item, ItemCreate, ItemUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Item])
+def read_items(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    category_id: Optional[int] = None,
+    supplier_id: Optional[int] = None,
+    low_stock: Optional[bool] = False,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Retrieve inventory items with optional filtering.
+    """
+    if low_stock:
+        items = crud.item.get_low_stock(db, skip=skip, limit=limit)
+    elif category_id:
+        items = crud.item.get_by_category(db, category_id=category_id, skip=skip, limit=limit)
+    elif supplier_id:
+        items = crud.item.get_by_supplier(db, supplier_id=supplier_id, skip=skip, limit=limit)
+    else:
+        items = crud.item.get_multi(db, skip=skip, limit=limit)
+    return items
+
+
+@router.post("/", response_model=Item, status_code=status.HTTP_201_CREATED)
+def create_item(
+    *,
+    db: Session = Depends(deps.get_db),
+    item_in: ItemCreate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Create new inventory item.
+    """
+    # Check if item with the same SKU or barcode already exists
+    if item_in.sku:
+        item = crud.item.get_by_sku(db, sku=item_in.sku)
+        if item:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Item with this SKU already exists",
+            )
+    
+    if item_in.barcode:
+        item = crud.item.get_by_barcode(db, barcode=item_in.barcode)
+        if item:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Item with this barcode already exists",
+            )
+    
+    # Validate category if provided
+    if item_in.category_id and not crud.category.get(db, id=item_in.category_id):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="The category doesn't exist",
+        )
+    
+    # Validate supplier if provided
+    if item_in.supplier_id and not crud.supplier.get(db, id=item_in.supplier_id):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="The supplier doesn't exist",
+        )
+    
+    item = crud.item.create(db, obj_in=item_in)
+    return item
+
+
+@router.get("/{item_id}", response_model=Item)
+def read_item(
+    *,
+    db: Session = Depends(deps.get_db),
+    item_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get item by ID.
+    """
+    item = crud.item.get(db, id=item_id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Item not found",
+        )
+    return item
+
+
+@router.put("/{item_id}", response_model=Item)
+def update_item(
+    *,
+    db: Session = Depends(deps.get_db),
+    item_id: int,
+    item_in: ItemUpdate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Update an item.
+    """
+    item = crud.item.get(db, id=item_id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Item not found",
+        )
+    
+    # Check if SKU is being changed and if it already exists
+    if item_in.sku and item_in.sku != item.sku:
+        existing_item = crud.item.get_by_sku(db, sku=item_in.sku)
+        if existing_item and existing_item.id != item_id:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Item with this SKU already exists",
+            )
+    
+    # Check if barcode is being changed and if it already exists
+    if item_in.barcode and item_in.barcode != item.barcode:
+        existing_item = crud.item.get_by_barcode(db, barcode=item_in.barcode)
+        if existing_item and existing_item.id != item_id:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Item with this barcode already exists",
+            )
+    
+    # Validate category if provided
+    if item_in.category_id and not crud.category.get(db, id=item_in.category_id):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="The category doesn't exist",
+        )
+    
+    # Validate supplier if provided
+    if item_in.supplier_id and not crud.supplier.get(db, id=item_in.supplier_id):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="The supplier doesn't exist",
+        )
+    
+    item = crud.item.update(db, db_obj=item, obj_in=item_in)
+    return item
+
+
+@router.delete("/{item_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_item(
+    *,
+    db: Session = Depends(deps.get_db),
+    item_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Delete an item.
+    """
+    item = crud.item.get(db, id=item_id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Item not found",
+        )
+    
+    # Check if the item has any transactions
+    transactions = crud.transaction.get_by_item(db, item_id=item_id, skip=0, limit=1)
+    if transactions:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot delete item with transaction history",
+        )
+    
+    crud.item.remove(db, id=item_id)
+    return None
+
+
+@router.get("/search/", response_model=List[Item])
+def search_items(
+    *,
+    db: Session = Depends(deps.get_db),
+    name: Optional[str] = Query(None, min_length=1),
+    sku: Optional[str] = Query(None, min_length=1),
+    barcode: Optional[str] = Query(None, min_length=1),
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Search for items by name, SKU, or barcode.
+    """
+    if sku:
+        item = crud.item.get_by_sku(db, sku=sku)
+        return [item] if item else []
+    
+    if barcode:
+        item = crud.item.get_by_barcode(db, barcode=barcode)
+        return [item] if item else []
+    
+    if name:
+        items = db.query(crud.item.model).filter(
+            crud.item.model.name.ilike(f"%{name}%")
+        ).all()
+        return items
+    
+    # If no search parameters are provided, return an empty list
+    return []

app/api/v1/endpoints/suppliers.py

@@ -0,0 +1,127 @@
+from typing import Any, List
+
+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
+from app.schemas.supplier import Supplier, SupplierCreate, SupplierUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Supplier])
+def read_suppliers(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Retrieve suppliers.
+    """
+    suppliers = crud.supplier.get_multi(db, skip=skip, limit=limit)
+    return suppliers
+
+
+@router.post("/", response_model=Supplier, status_code=status.HTTP_201_CREATED)
+def create_supplier(
+    *,
+    db: Session = Depends(deps.get_db),
+    supplier_in: SupplierCreate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Create new supplier.
+    """
+    # Check if supplier with the same email already exists (if email is provided)
+    if supplier_in.email:
+        supplier = crud.supplier.get_by_email(db, email=supplier_in.email)
+        if supplier:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Supplier with this email already exists",
+            )
+    
+    supplier = crud.supplier.create(db, obj_in=supplier_in)
+    return supplier
+
+
+@router.get("/{supplier_id}", response_model=Supplier)
+def read_supplier(
+    *,
+    db: Session = Depends(deps.get_db),
+    supplier_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get supplier by ID.
+    """
+    supplier = crud.supplier.get(db, id=supplier_id)
+    if not supplier:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Supplier not found",
+        )
+    return supplier
+
+
+@router.put("/{supplier_id}", response_model=Supplier)
+def update_supplier(
+    *,
+    db: Session = Depends(deps.get_db),
+    supplier_id: int,
+    supplier_in: SupplierUpdate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Update a supplier.
+    """
+    supplier = crud.supplier.get(db, id=supplier_id)
+    if not supplier:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Supplier not found",
+        )
+    
+    # Check if email is being changed and if it already exists
+    if supplier_in.email and supplier_in.email != supplier.email:
+        existing_supplier = crud.supplier.get_by_email(db, email=supplier_in.email)
+        if existing_supplier and existing_supplier.id != supplier_id:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Supplier with this email already exists",
+            )
+    
+    supplier = crud.supplier.update(db, db_obj=supplier, obj_in=supplier_in)
+    return supplier
+
+
+@router.delete("/{supplier_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_supplier(
+    *,
+    db: Session = Depends(deps.get_db),
+    supplier_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Delete a supplier.
+    """
+    supplier = crud.supplier.get(db, id=supplier_id)
+    if not supplier:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Supplier not found",
+        )
+    
+    # Check if any items are using this supplier
+    items = crud.item.get_by_supplier(db, supplier_id=supplier_id, skip=0, limit=1)
+    if items:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot delete supplier with associated items",
+        )
+    
+    crud.supplier.remove(db, id=supplier_id)
+    return None

app/api/v1/endpoints/transactions.py

@@ -0,0 +1,176 @@
+from datetime import datetime, timedelta
+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.transaction import TransactionType
+from app.models.user import User
+from app.schemas.transaction import Transaction, TransactionCreate, TransactionUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Transaction])
+def read_transactions(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    item_id: Optional[int] = None,
+    transaction_type: Optional[TransactionType] = None,
+    start_date: Optional[datetime] = None,
+    end_date: Optional[datetime] = None,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Retrieve transactions with optional filtering.
+    """
+    if item_id:
+        transactions = crud.transaction.get_by_item(db, item_id=item_id, skip=skip, limit=limit)
+    elif transaction_type:
+        transactions = crud.transaction.get_by_type(db, transaction_type=transaction_type, skip=skip, limit=limit)
+    elif start_date and end_date:
+        transactions = crud.transaction.get_by_date_range(
+            db, start_date=start_date, end_date=end_date, skip=skip, limit=limit
+        )
+    else:
+        transactions = crud.transaction.get_multi(db, skip=skip, limit=limit)
+    
+    return transactions
+
+
+@router.post("/", response_model=Transaction, status_code=status.HTTP_201_CREATED)
+def create_transaction(
+    *,
+    db: Session = Depends(deps.get_db),
+    transaction_in: TransactionCreate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Create new transaction (stock in or stock out).
+    """
+    # Check if item exists
+    item = crud.item.get(db, id=transaction_in.item_id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Item not found",
+        )
+    
+    # For stock out transactions, check if there's enough stock
+    if transaction_in.transaction_type == TransactionType.STOCK_OUT and item.quantity < transaction_in.quantity:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Insufficient stock. Available: {item.quantity}, Requested: {transaction_in.quantity}",
+        )
+    
+    # Create transaction with item quantity update
+    transaction = crud.transaction.create_with_item_update(
+        db, obj_in=transaction_in, user_id=current_user.id
+    )
+    return transaction
+
+
+@router.get("/{transaction_id}", response_model=Transaction)
+def read_transaction(
+    *,
+    db: Session = Depends(deps.get_db),
+    transaction_id: int,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get transaction by ID.
+    """
+    transaction = crud.transaction.get(db, id=transaction_id)
+    if not transaction:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Transaction not found",
+        )
+    return transaction
+
+
+@router.put("/{transaction_id}", response_model=Transaction)
+def update_transaction(
+    *,
+    db: Session = Depends(deps.get_db),
+    transaction_id: int,
+    transaction_in: TransactionUpdate,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Update a transaction's metadata (notes, reference) only.
+    Quantity and item changes are not allowed to maintain inventory integrity.
+    """
+    transaction = crud.transaction.get(db, id=transaction_id)
+    if not transaction:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Transaction not found",
+        )
+    
+    # Only allow updating certain fields (reference, notes)
+    # Do not allow changing quantity, unit price to maintain inventory integrity
+    update_data = transaction_in.dict(exclude_unset=True)
+    for field in ["quantity", "unit_price"]:
+        if field in update_data:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail=f"Cannot update {field} after transaction is created",
+            )
+    
+    # Calculate total_price if unit_price is updated
+    if "unit_price" in update_data:
+        update_data["total_price"] = transaction.quantity * update_data["unit_price"]
+    
+    transaction = crud.transaction.update(db, db_obj=transaction, obj_in=update_data)
+    return transaction
+
+
+@router.get("/by-item/{item_id}", response_model=List[Transaction])
+def read_item_transactions(
+    *,
+    db: Session = Depends(deps.get_db),
+    item_id: int,
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get all transactions for a specific item.
+    """
+    # Check if item exists
+    item = crud.item.get(db, id=item_id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Item not found",
+        )
+    
+    transactions = crud.transaction.get_by_item(db, item_id=item_id, skip=skip, limit=limit)
+    return transactions
+
+
+@router.get("/report/daily/", response_model=List[Transaction])
+def get_daily_transactions(
+    *,
+    db: Session = Depends(deps.get_db),
+    date: Optional[datetime] = Query(None),
+    current_user: User = Depends(deps.get_current_user),
+) -> Any:
+    """
+    Get all transactions for a specific day.
+    """
+    # Default to today if no date is provided
+    if not date:
+        date = datetime.now()
+    
+    start_date = datetime(date.year, date.month, date.day, 0, 0, 0)
+    end_date = start_date + timedelta(days=1) - timedelta(microseconds=1)
+    
+    transactions = crud.transaction.get_by_date_range(
+        db, start_date=start_date, end_date=end_date
+    )
+    return transactions

app/core/config.py

@@ -0,0 +1,31 @@
+import os
+from pathlib import Path
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    """
+    Application settings class that loads configuration from environment variables.
+    """
+    # API details
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "Small Business Inventory Management System"
+    PROJECT_DESCRIPTION: str = "API for managing inventory in small businesses"
+    PROJECT_VERSION: str = "0.1.0"
+
+    # Security
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "super-secret-key-for-development-only")
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "60"))
+    ALGORITHM: str = "HS256"
+
+    # Database
+    DB_DIR = Path("/app") / "storage" / "db"
+    DB_DIR.mkdir(parents=True, exist_ok=True)
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+
+    class Config:
+        case_sensitive = True
+
+
+settings = Settings()

app/core/security.py

@@ -0,0 +1,40 @@
+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:
+    """
+    Create a JWT access token.
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verify a password against its hash.
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password.
+    """
+    return pwd_context.hash(password)

app/crud/__init__.py

@@ -0,0 +1,5 @@
+from app.crud.crud_category import category
+from app.crud.crud_item import item
+from app.crud.crud_supplier import supplier
+from app.crud.crud_transaction import transaction
+from app.crud.crud_user import user

app/crud/base.py

@@ -0,0 +1,79 @@
+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 import Base
+
+ModelType = TypeVar("ModelType", bound=Base)
+CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
+UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
+
+
+class CRUDBase(Generic[ModelType, CreateSchemaType, UpdateSchemaType]):
+    """
+    Base class for CRUD operations.
+    """
+    def __init__(self, model: Type[ModelType]):
+        """
+        Initialize with SQLAlchemy model class.
+        """
+        self.model = model
+
+    def get(self, db: Session, id: Any) -> Optional[ModelType]:
+        """
+        Get a record by ID.
+        """
+        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]:
+        """
+        Get multiple records with pagination.
+        """
+        return db.query(self.model).offset(skip).limit(limit).all()
+
+    def create(self, db: Session, *, obj_in: CreateSchemaType) -> ModelType:
+        """
+        Create a new record.
+        """
+        obj_in_data = jsonable_encoder(obj_in)
+        db_obj = self.model(**obj_in_data)
+        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:
+        """
+        Update a record.
+        """
+        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: int) -> ModelType:
+        """
+        Delete a record.
+        """
+        obj = db.query(self.model).get(id)
+        db.delete(obj)
+        db.commit()
+        return obj

app/crud/crud_category.py

@@ -0,0 +1,21 @@
+from typing import Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.category import Category
+from app.schemas.category import CategoryCreate, CategoryUpdate
+
+
+class CRUDCategory(CRUDBase[Category, CategoryCreate, CategoryUpdate]):
+    """
+    CRUD operations for Category model.
+    """
+    def get_by_name(self, db: Session, *, name: str) -> Optional[Category]:
+        """
+        Get a category by name.
+        """
+        return db.query(Category).filter(Category.name == name).first()
+
+
+category = CRUDCategory(Category)

app/crud/crud_item.py

@@ -0,0 +1,69 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.item import Item
+from app.schemas.item import ItemCreate, ItemUpdate
+
+
+class CRUDItem(CRUDBase[Item, ItemCreate, ItemUpdate]):
+    """
+    CRUD operations for Item model.
+    """
+    def get_by_sku(self, db: Session, *, sku: str) -> Optional[Item]:
+        """
+        Get an item by SKU.
+        """
+        return db.query(Item).filter(Item.sku == sku).first()
+    
+    def get_by_barcode(self, db: Session, *, barcode: str) -> Optional[Item]:
+        """
+        Get an item by barcode.
+        """
+        return db.query(Item).filter(Item.barcode == barcode).first()
+    
+    def get_by_category(
+        self, db: Session, *, category_id: int, skip: int = 0, limit: int = 100
+    ) -> List[Item]:
+        """
+        Get items by category.
+        """
+        return (
+            db.query(Item)
+            .filter(Item.category_id == category_id)
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+    
+    def get_by_supplier(
+        self, db: Session, *, supplier_id: int, skip: int = 0, limit: int = 100
+    ) -> List[Item]:
+        """
+        Get items by supplier.
+        """
+        return (
+            db.query(Item)
+            .filter(Item.supplier_id == supplier_id)
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+    
+    def get_low_stock(
+        self, db: Session, *, skip: int = 0, limit: int = 100
+    ) -> List[Item]:
+        """
+        Get items with stock quantity below reorder level.
+        """
+        return (
+            db.query(Item)
+            .filter(Item.quantity <= Item.reorder_level)
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+
+
+item = CRUDItem(Item)

app/crud/crud_supplier.py

@@ -0,0 +1,27 @@
+from typing import Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.supplier import Supplier
+from app.schemas.supplier import SupplierCreate, SupplierUpdate
+
+
+class CRUDSupplier(CRUDBase[Supplier, SupplierCreate, SupplierUpdate]):
+    """
+    CRUD operations for Supplier model.
+    """
+    def get_by_name(self, db: Session, *, name: str) -> Optional[Supplier]:
+        """
+        Get a supplier by name.
+        """
+        return db.query(Supplier).filter(Supplier.name == name).first()
+    
+    def get_by_email(self, db: Session, *, email: str) -> Optional[Supplier]:
+        """
+        Get a supplier by email.
+        """
+        return db.query(Supplier).filter(Supplier.email == email).first()
+
+
+supplier = CRUDSupplier(Supplier)

app/crud/crud_transaction.py

@@ -0,0 +1,125 @@
+from datetime import datetime
+from typing import List
+
+from sqlalchemy import and_
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.item import Item
+from app.models.transaction import Transaction, TransactionType
+from app.schemas.transaction import TransactionCreate, TransactionUpdate
+
+
+class CRUDTransaction(CRUDBase[Transaction, TransactionCreate, TransactionUpdate]):
+    """
+    CRUD operations for Transaction model.
+    """
+    def create_with_item_update(
+        self, db: Session, *, obj_in: TransactionCreate, user_id: int
+    ) -> Transaction:
+        """
+        Create a transaction and update the associated item's quantity.
+        """
+        # Get the item to update its quantity
+        item = db.query(Item).filter(Item.id == obj_in.item_id).first()
+        if not item:
+            raise ValueError(f"Item with ID {obj_in.item_id} not found")
+        
+        # Calculate the total price
+        total_price = obj_in.quantity * obj_in.unit_price
+        
+        # Create transaction object
+        db_obj = Transaction(
+            item_id=obj_in.item_id,
+            user_id=user_id,
+            quantity=obj_in.quantity,
+            transaction_type=obj_in.transaction_type,
+            unit_price=obj_in.unit_price,
+            total_price=total_price,
+            reference=obj_in.reference,
+            notes=obj_in.notes,
+            timestamp=datetime.utcnow()
+        )
+        
+        # Update the item quantity based on transaction type
+        if obj_in.transaction_type == TransactionType.STOCK_IN:
+            item.quantity += obj_in.quantity
+        elif obj_in.transaction_type == TransactionType.STOCK_OUT:
+            if item.quantity < obj_in.quantity:
+                raise ValueError(f"Insufficient stock. Available: {item.quantity}, Requested: {obj_in.quantity}")
+            item.quantity -= obj_in.quantity
+        
+        # Save to database
+        db.add(db_obj)
+        db.add(item)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+    
+    def get_by_item(
+        self, db: Session, *, item_id: int, skip: int = 0, limit: int = 100
+    ) -> List[Transaction]:
+        """
+        Get transactions for a specific item.
+        """
+        return (
+            db.query(Transaction)
+            .filter(Transaction.item_id == item_id)
+            .order_by(Transaction.timestamp.desc())
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+    
+    def get_by_user(
+        self, db: Session, *, user_id: int, skip: int = 0, limit: int = 100
+    ) -> List[Transaction]:
+        """
+        Get transactions performed by a specific user.
+        """
+        return (
+            db.query(Transaction)
+            .filter(Transaction.user_id == user_id)
+            .order_by(Transaction.timestamp.desc())
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+    
+    def get_by_date_range(
+        self, db: Session, *, start_date: datetime, end_date: datetime,
+        skip: int = 0, limit: int = 100
+    ) -> List[Transaction]:
+        """
+        Get transactions within a date range.
+        """
+        return (
+            db.query(Transaction)
+            .filter(and_(
+                Transaction.timestamp >= start_date,
+                Transaction.timestamp <= end_date
+            ))
+            .order_by(Transaction.timestamp.desc())
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+    
+    def get_by_type(
+        self, db: Session, *, transaction_type: TransactionType,
+        skip: int = 0, limit: int = 100
+    ) -> List[Transaction]:
+        """
+        Get transactions by type (stock in or stock out).
+        """
+        return (
+            db.query(Transaction)
+            .filter(Transaction.transaction_type == transaction_type)
+            .order_by(Transaction.timestamp.desc())
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+
+
+transaction = CRUDTransaction(Transaction)

app/crud/crud_user.py

@@ -0,0 +1,84 @@
+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]):
+    """
+    CRUD operations for User model.
+    """
+    def get_by_email(self, db: Session, *, email: str) -> Optional[User]:
+        """
+        Get a user by email.
+        """
+        return db.query(User).filter(User.email == email).first()
+
+    def get_by_username(self, db: Session, *, username: str) -> Optional[User]:
+        """
+        Get a user by username.
+        """
+        return db.query(User).filter(User.username == username).first()
+
+    def create(self, db: Session, *, obj_in: UserCreate) -> User:
+        """
+        Create a new user with hashed password.
+        """
+        db_obj = User(
+            username=obj_in.username,
+            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(
+        self, db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+    ) -> User:
+        """
+        Update a user, handling password hashing if provided.
+        """
+        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, *, username: str, password: str) -> Optional[User]:
+        """
+        Authenticate a user by username and password.
+        """
+        user = self.get_by_username(db, username=username)
+        if not user:
+            return None
+        if not verify_password(password, user.hashed_password):
+            return None
+        return user
+
+    def is_active(self, user: User) -> bool:
+        """
+        Check if a user is active.
+        """
+        return user.is_active
+
+    def is_superuser(self, user: User) -> bool:
+        """
+        Check if a user is a superuser.
+        """
+        return user.is_superuser
+
+
+user = CRUDUser(User)

app/db/base.py

@@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/deps.py

@@ -0,0 +1,52 @@
+from typing import Generator
+
+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.db.session import SessionLocal
+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_db() -> Generator:
+    """
+    Get a database session as a dependency for routes.
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    """
+    Get the current user based on the JWT 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]
+        )
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+        token_data = TokenPayload(username=username)
+    except JWTError:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.username == token_data.username).first()
+    if user is None:
+        raise credentials_exception
+    return user

app/db/session.py

@@ -0,0 +1,11 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}  # For SQLite only
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

app/models/base_model.py

@@ -0,0 +1,17 @@
+from app.db.base import Base
+from app.models.category import Category
+from app.models.item import Item
+from app.models.supplier import Supplier
+from app.models.transaction import Transaction, TransactionType
+from app.models.user import User
+
+# Import all models here to make them available for Alembic
+__all__ = [
+    "Base",
+    "User",
+    "Item",
+    "Category",
+    "Supplier",
+    "Transaction",
+    "TransactionType"
+]

app/models/category.py

@@ -0,0 +1,18 @@
+from sqlalchemy import Column, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class Category(Base):
+    """
+    Category model for categorizing inventory items.
+    """
+    __tablename__ = "categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True, nullable=False, unique=True)
+    description = Column(String, nullable=True)
+    
+    # Relationships
+    items = relationship("Item", back_populates="category")

app/models/item.py

@@ -0,0 +1,27 @@
+from sqlalchemy import Column, Float, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class Item(Base):
+    """
+    Inventory item model for tracking products and stock.
+    """
+    __tablename__ = "items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True, nullable=False)
+    description = Column(Text, nullable=True)
+    sku = Column(String, unique=True, index=True, nullable=True)
+    barcode = Column(String, unique=True, index=True, nullable=True)
+    quantity = Column(Integer, default=0, nullable=False)
+    unit_price = Column(Float, nullable=False)
+    reorder_level = Column(Integer, default=10, nullable=False)
+    category_id = Column(Integer, ForeignKey("categories.id"), nullable=True)
+    supplier_id = Column(Integer, ForeignKey("suppliers.id"), nullable=True)
+    
+    # Relationships
+    category = relationship("Category", back_populates="items")
+    supplier = relationship("Supplier", back_populates="items")
+    transactions = relationship("Transaction", back_populates="item")

app/models/supplier.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class Supplier(Base):
+    """
+    Supplier model for tracking inventory suppliers.
+    """
+    __tablename__ = "suppliers"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True, nullable=False)
+    contact_name = Column(String, nullable=True)
+    email = Column(String, nullable=True)
+    phone = Column(String, nullable=True)
+    address = Column(String, nullable=True)
+    
+    # Relationships
+    items = relationship("Item", back_populates="supplier")

app/models/transaction.py

@@ -0,0 +1,39 @@
+from datetime import datetime
+import enum
+
+from sqlalchemy import Column, DateTime, Enum, Float, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class TransactionType(str, enum.Enum):
+    """
+    Enum for transaction types (stock in or out).
+    """
+    STOCK_IN = "stock_in"
+    STOCK_OUT = "stock_out"
+
+
+class Transaction(Base):
+    """
+    Transaction model for tracking inventory movements.
+    """
+    __tablename__ = "transactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    quantity = Column(Integer, nullable=False)
+    transaction_type = Column(Enum(TransactionType), nullable=False)
+    unit_price = Column(Float, nullable=False)
+    total_price = Column(Float, nullable=False)
+    reference = Column(String, nullable=True)
+    notes = Column(String, nullable=True)
+    timestamp = Column(DateTime, default=datetime.utcnow, nullable=False)
+    
+    # Foreign keys
+    item_id = Column(Integer, ForeignKey("items.id"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    
+    # Relationships
+    item = relationship("Item", back_populates="transactions")
+    user = relationship("User", back_populates="transactions")

app/models/user.py

@@ -0,0 +1,22 @@
+from sqlalchemy import Boolean, Column, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class User(Base):
+    """
+    User model for authentication and authorization.
+    """
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String, unique=True, index=True, nullable=False)
+    email = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+    
+    # Relationships
+    transactions = relationship("Transaction", back_populates="user")

app/schemas/category.py

@@ -0,0 +1,51 @@
+from typing import List, Optional
+
+from pydantic import BaseModel, Field
+
+
+class CategoryBase(BaseModel):
+    """
+    Base category schema with common attributes.
+    """
+    name: str = Field(..., description="Category name")
+    description: Optional[str] = Field(None, description="Category description")
+
+
+class CategoryCreate(CategoryBase):
+    """
+    Schema for category creation.
+    """
+    pass
+
+
+class CategoryUpdate(BaseModel):
+    """
+    Schema for updating category information.
+    """
+    name: Optional[str] = Field(None, description="Category name")
+    description: Optional[str] = Field(None, description="Category description")
+
+
+class CategoryInDBBase(CategoryBase):
+    """
+    Base schema for categories from the database.
+    """
+    id: int = Field(..., description="Category ID")
+
+    class Config:
+        from_attributes = True
+
+
+class Category(CategoryInDBBase):
+    """
+    Schema for category information returned to clients.
+    """
+    pass
+
+
+class CategoryWithItems(CategoryInDBBase):
+    """
+    Schema for category with related items.
+    """
+    from app.schemas.item import Item
+    items: List[Item] = Field([], description="Items in this category")

app/schemas/item.py

@@ -0,0 +1,68 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+class ItemBase(BaseModel):
+    """
+    Base item schema with common attributes.
+    """
+    name: str = Field(..., description="Item name")
+    description: Optional[str] = Field(None, description="Item description")
+    sku: Optional[str] = Field(None, description="Stock Keeping Unit")
+    barcode: Optional[str] = Field(None, description="Barcode/UPC")
+    quantity: int = Field(0, description="Current stock quantity", ge=0)
+    unit_price: float = Field(..., description="Unit price", gt=0)
+    reorder_level: int = Field(10, description="Quantity at which to reorder", ge=0)
+    category_id: Optional[int] = Field(None, description="ID of the category")
+    supplier_id: Optional[int] = Field(None, description="ID of the supplier")
+
+
+class ItemCreate(ItemBase):
+    """
+    Schema for item creation.
+    """
+    pass
+
+
+class ItemUpdate(BaseModel):
+    """
+    Schema for updating item information.
+    """
+    name: Optional[str] = Field(None, description="Item name")
+    description: Optional[str] = Field(None, description="Item description")
+    sku: Optional[str] = Field(None, description="Stock Keeping Unit")
+    barcode: Optional[str] = Field(None, description="Barcode/UPC")
+    quantity: Optional[int] = Field(None, description="Current stock quantity", ge=0)
+    unit_price: Optional[float] = Field(None, description="Unit price", gt=0)
+    reorder_level: Optional[int] = Field(None, description="Quantity at which to reorder", ge=0)
+    category_id: Optional[int] = Field(None, description="ID of the category")
+    supplier_id: Optional[int] = Field(None, description="ID of the supplier")
+
+
+class ItemInDBBase(ItemBase):
+    """
+    Base schema for items from the database.
+    """
+    id: int = Field(..., description="Item ID")
+
+    class Config:
+        from_attributes = True
+
+
+class Item(ItemInDBBase):
+    """
+    Schema for item information returned to clients.
+    """
+    pass
+
+
+class ItemWithRelations(ItemInDBBase):
+    """
+    Schema for item with related entities.
+    """
+    from app.schemas.category import Category
+    from app.schemas.supplier import Supplier
+    
+    category: Optional[Category] = Field(None, description="Item category")
+    supplier: Optional[Supplier] = Field(None, description="Item supplier")

app/schemas/supplier.py

@@ -0,0 +1,57 @@
+from typing import List, Optional
+
+from pydantic import BaseModel, EmailStr, Field
+
+
+class SupplierBase(BaseModel):
+    """
+    Base supplier schema with common attributes.
+    """
+    name: str = Field(..., description="Supplier name")
+    contact_name: Optional[str] = Field(None, description="Contact person name")
+    email: Optional[EmailStr] = Field(None, description="Supplier email address")
+    phone: Optional[str] = Field(None, description="Supplier phone number")
+    address: Optional[str] = Field(None, description="Supplier address")
+
+
+class SupplierCreate(SupplierBase):
+    """
+    Schema for supplier creation.
+    """
+    pass
+
+
+class SupplierUpdate(BaseModel):
+    """
+    Schema for updating supplier information.
+    """
+    name: Optional[str] = Field(None, description="Supplier name")
+    contact_name: Optional[str] = Field(None, description="Contact person name")
+    email: Optional[EmailStr] = Field(None, description="Supplier email address")
+    phone: Optional[str] = Field(None, description="Supplier phone number")
+    address: Optional[str] = Field(None, description="Supplier address")
+
+
+class SupplierInDBBase(SupplierBase):
+    """
+    Base schema for suppliers from the database.
+    """
+    id: int = Field(..., description="Supplier ID")
+
+    class Config:
+        from_attributes = True
+
+
+class Supplier(SupplierInDBBase):
+    """
+    Schema for supplier information returned to clients.
+    """
+    pass
+
+
+class SupplierWithItems(SupplierInDBBase):
+    """
+    Schema for supplier with related items.
+    """
+    from app.schemas.item import Item
+    items: List[Item] = Field([], description="Items from this supplier")

app/schemas/token.py

@@ -0,0 +1,18 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+class Token(BaseModel):
+    """
+    Schema for the token response.
+    """
+    access_token: str = Field(..., description="JWT access token")
+    token_type: str = Field(..., description="Token type (bearer)")
+
+
+class TokenPayload(BaseModel):
+    """
+    Schema for the token payload (JWT claims).
+    """
+    username: Optional[str] = None

app/schemas/transaction.py

@@ -0,0 +1,71 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field, validator
+
+from app.models.transaction import TransactionType
+
+
+class TransactionBase(BaseModel):
+    """
+    Base transaction schema with common attributes.
+    """
+    item_id: int = Field(..., description="ID of the item")
+    quantity: int = Field(..., description="Transaction quantity", gt=0)
+    transaction_type: TransactionType = Field(..., description="Type of transaction")
+    unit_price: float = Field(..., description="Unit price", gt=0)
+    reference: Optional[str] = Field(None, description="Reference number or order ID")
+    notes: Optional[str] = Field(None, description="Additional notes")
+
+
+class TransactionCreate(TransactionBase):
+    """
+    Schema for transaction creation.
+    """
+    
+    @validator('transaction_type')
+    def validate_transaction_type(cls, v):
+        if v not in [TransactionType.STOCK_IN, TransactionType.STOCK_OUT]:
+            raise ValueError('Transaction type must be either stock_in or stock_out')
+        return v
+
+
+class TransactionUpdate(BaseModel):
+    """
+    Schema for updating transaction information.
+    """
+    quantity: Optional[int] = Field(None, description="Transaction quantity", gt=0)
+    unit_price: Optional[float] = Field(None, description="Unit price", gt=0)
+    reference: Optional[str] = Field(None, description="Reference number or order ID")
+    notes: Optional[str] = Field(None, description="Additional notes")
+
+
+class TransactionInDBBase(TransactionBase):
+    """
+    Base schema for transactions from the database.
+    """
+    id: int = Field(..., description="Transaction ID")
+    total_price: float = Field(..., description="Total transaction price")
+    timestamp: datetime = Field(..., description="Transaction timestamp")
+    user_id: int = Field(..., description="ID of the user who performed the transaction")
+
+    class Config:
+        from_attributes = True
+
+
+class Transaction(TransactionInDBBase):
+    """
+    Schema for transaction information returned to clients.
+    """
+    pass
+
+
+class TransactionWithDetails(TransactionInDBBase):
+    """
+    Schema for transaction with related entities.
+    """
+    from app.schemas.item import Item
+    from app.schemas.user import User
+    
+    item: Item = Field(..., description="Transaction item")
+    user: User = Field(..., description="User who performed the transaction")

app/schemas/user.py

@@ -0,0 +1,57 @@
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr, Field
+
+
+class UserBase(BaseModel):
+    """
+    Base user schema with common attributes.
+    """
+    username: str = Field(..., description="Username for login")
+    email: EmailStr = Field(..., description="User's email address")
+    full_name: Optional[str] = Field(None, description="User's full name")
+    is_active: bool = Field(True, description="Whether the user is active")
+    is_superuser: bool = Field(False, description="Whether the user has admin privileges")
+
+
+class UserCreate(UserBase):
+    """
+    Schema for user creation with password.
+    """
+    password: str = Field(..., description="User's password")
+
+
+class UserUpdate(BaseModel):
+    """
+    Schema for updating user information.
+    """
+    username: Optional[str] = Field(None, description="Username for login")
+    email: Optional[EmailStr] = Field(None, description="User's email address")
+    full_name: Optional[str] = Field(None, description="User's full name")
+    password: Optional[str] = Field(None, description="User's password")
+    is_active: Optional[bool] = Field(None, description="Whether the user is active")
+    is_superuser: Optional[bool] = Field(None, description="Whether the user has admin privileges")
+
+
+class UserInDBBase(UserBase):
+    """
+    Base schema for users from the database.
+    """
+    id: int = Field(..., description="User ID")
+
+    class Config:
+        from_attributes = True
+
+
+class User(UserInDBBase):
+    """
+    Schema for user information returned to clients.
+    """
+    pass
+
+
+class UserInDB(UserInDBBase):
+    """
+    Schema for user in database including hashed password.
+    """
+    hashed_password: str = Field(..., description="Hashed password")

main.py

@@ -0,0 +1,53 @@
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+import uvicorn
+
+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.PROJECT_VERSION,
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Add CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+
+@app.get("/")
+def root():
+    """
+    Root endpoint that returns basic information about the service.
+    """
+    return {
+        "title": settings.PROJECT_NAME,
+        "description": settings.PROJECT_DESCRIPTION,
+        "documentation": "/docs",
+        "health_check": "/health"
+    }
+
+
+@app.get("/health", response_model=dict)
+def health_check():
+    """
+    Health check endpoint to verify the service is running.
+    """
+    return {"status": "ok"}
+
+
+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 +1,78 @@
+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.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+from app.models.base_model import Base
+
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite  # Key configuration for 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():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/1a0c5d3a2b4c_initial_migration.py

@@ -0,0 +1,124 @@
+"""Initial migration
+
+Revision ID: 1a0c5d3a2b4c
+Revises: 
+Create Date: 2023-09-21 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '1a0c5d3a2b4c'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Create users table
+    op.create_table(
+        'users',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('username', sa.String(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('is_superuser', sa.Boolean(), 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('description', sa.String(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_categories_id'), 'categories', ['id'], unique=False)
+    op.create_index(op.f('ix_categories_name'), 'categories', ['name'], unique=True)
+    
+    # Create suppliers table
+    op.create_table(
+        'suppliers',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('contact_name', sa.String(), nullable=True),
+        sa.Column('email', sa.String(), nullable=True),
+        sa.Column('phone', sa.String(), nullable=True),
+        sa.Column('address', sa.String(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_suppliers_id'), 'suppliers', ['id'], unique=False)
+    op.create_index(op.f('ix_suppliers_name'), 'suppliers', ['name'], unique=False)
+    
+    # Create items table
+    op.create_table(
+        'items',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('sku', sa.String(), nullable=True),
+        sa.Column('barcode', sa.String(), nullable=True),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('unit_price', sa.Float(), nullable=False),
+        sa.Column('reorder_level', sa.Integer(), nullable=False),
+        sa.Column('category_id', sa.Integer(), nullable=True),
+        sa.Column('supplier_id', sa.Integer(), nullable=True),
+        sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
+        sa.ForeignKeyConstraint(['supplier_id'], ['suppliers.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_items_barcode'), 'items', ['barcode'], unique=True)
+    op.create_index(op.f('ix_items_id'), 'items', ['id'], unique=False)
+    op.create_index(op.f('ix_items_name'), 'items', ['name'], unique=False)
+    op.create_index(op.f('ix_items_sku'), 'items', ['sku'], unique=True)
+    
+    # Create transactions table
+    op.create_table(
+        'transactions',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('item_id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('transaction_type', sa.Enum('STOCK_IN', 'STOCK_OUT', name='transactiontype'), nullable=False),
+        sa.Column('unit_price', sa.Float(), nullable=False),
+        sa.Column('total_price', sa.Float(), nullable=False),
+        sa.Column('reference', sa.String(), nullable=True),
+        sa.Column('notes', sa.String(), nullable=True),
+        sa.Column('timestamp', sa.DateTime(), nullable=False),
+        sa.ForeignKeyConstraint(['item_id'], ['items.id'], ),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_transactions_id'), 'transactions', ['id'], unique=False)
+
+
+def downgrade():
+    # Drop tables in reverse order
+    op.drop_index(op.f('ix_transactions_id'), table_name='transactions')
+    op.drop_table('transactions')
+    
+    op.drop_index(op.f('ix_items_sku'), table_name='items')
+    op.drop_index(op.f('ix_items_name'), table_name='items')
+    op.drop_index(op.f('ix_items_id'), table_name='items')
+    op.drop_index(op.f('ix_items_barcode'), table_name='items')
+    op.drop_table('items')
+    
+    op.drop_index(op.f('ix_suppliers_name'), table_name='suppliers')
+    op.drop_index(op.f('ix_suppliers_id'), table_name='suppliers')
+    op.drop_table('suppliers')
+    
+    op.drop_index(op.f('ix_categories_name'), table_name='categories')
+    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')

pyproject.toml

@@ -0,0 +1,30 @@
+[tool.ruff]
+target-version = "py38"
+line-length = 120
+
+[tool.ruff.lint]
+select = ["E", "F", "B", "I"]
+ignore = ["B008", "E501", "B904", "E402"]
+
+# Exclude a variety of commonly ignored directories.
+exclude = [
+    ".git",
+    ".ruff_cache",
+    "__pycache__",
+    "venv",
+    ".env",
+    ".venv",
+    "env",
+    "dist",
+]
+
+# Allow unused variables when underscore-prefixed.
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+[tool.ruff.lint.per-file-ignores]
+"__init__.py" = ["F401"]  # Ignore unused imports in __init__.py files
+
+[tool.ruff.lint.isort]
+force-single-line = false
+known-first-party = ["app"]
+force-sort-within-sections = true

requirements.txt

@@ -0,0 +1,23 @@
+# Core dependencies
+fastapi>=0.103.1
+uvicorn>=0.23.2
+pydantic>=2.3.0
+pydantic-settings>=2.0.3
+SQLAlchemy>=2.0.20
+alembic>=1.12.0
+
+# Database
+aiosqlite>=0.19.0
+
+# Authentication and security
+python-jose>=3.3.0
+passlib>=1.7.4
+python-multipart>=0.0.6
+bcrypt>=4.0.1
+
+# Linting and code quality
+ruff>=0.0.285
+
+# Testing
+pytest>=7.4.0
+httpx>=0.24.1