From 542a6336038013d5bebef3d08f3315377c4be08a Mon Sep 17 00:00:00 2001
From: Pratik Narola <pratik.narola@juspay.in>
Date: Sat, 13 Sep 2025 17:40:23 +0530
Subject: [PATCH] Initial commit

---
 .env.example                                  |  17 +
 .gitignore                                    |  11 +
 .python-version                               |   1 +
 README.md                                     |   0
 app/__init__.py                               | 108 +++
 app/api/__init__.py                           |  13 +
 app/api/analytics.py                          | 202 +++++
 app/api/categories.py                         | 331 +++++++++
 app/api/transactions.py                       | 364 +++++++++
 app/config.py                                 |  97 +++
 app/extensions.py                             |  14 +
 app/models/__init__.py                        |  12 +
 app/models/category.py                        |  79 ++
 app/models/transaction.py                     | 112 +++
 app/schemas/__init__.py                       |  36 +
 app/schemas/category.py                       | 103 +++
 app/schemas/transaction.py                    | 219 ++++++
 app/utils/__init__.py                         |   7 +
 frontend.html                                 | 688 ++++++++++++++++++
 frontend1.html                                | 669 +++++++++++++++++
 instance/personal_finance_dev.db              | Bin 0 -> 24576 bytes
 main.py                                       |   6 +
 migrations/README                             |   1 +
 migrations/alembic.ini                        |  50 ++
 migrations/env.py                             | 113 +++
 migrations/script.py.mako                     |  24 +
 ...6e_initial_migration_with_category_and_.py |  52 ++
 pyproject.toml                                |  17 +
 run.py                                        |  28 +
 uv.lock                                       | 402 ++++++++++
 30 files changed, 3776 insertions(+)
 create mode 100644 .env.example
 create mode 100644 .gitignore
 create mode 100644 .python-version
 create mode 100644 README.md
 create mode 100644 app/__init__.py
 create mode 100644 app/api/__init__.py
 create mode 100644 app/api/analytics.py
 create mode 100644 app/api/categories.py
 create mode 100644 app/api/transactions.py
 create mode 100644 app/config.py
 create mode 100644 app/extensions.py
 create mode 100644 app/models/__init__.py
 create mode 100644 app/models/category.py
 create mode 100644 app/models/transaction.py
 create mode 100644 app/schemas/__init__.py
 create mode 100644 app/schemas/category.py
 create mode 100644 app/schemas/transaction.py
 create mode 100644 app/utils/__init__.py
 create mode 100644 frontend.html
 create mode 100644 frontend1.html
 create mode 100644 instance/personal_finance_dev.db
 create mode 100644 main.py
 create mode 100644 migrations/README
 create mode 100644 migrations/alembic.ini
 create mode 100644 migrations/env.py
 create mode 100644 migrations/script.py.mako
 create mode 100644 migrations/versions/d0397a2e3a6e_initial_migration_with_category_and_.py
 create mode 100644 pyproject.toml
 create mode 100644 run.py
 create mode 100644 uv.lock

diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..fed556b
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,17 @@
+# Personal Finance API Environment Configuration
+# Copy this file to .env and update values for your environment
+
+# Flask Configuration
+FLASK_ENV=development
+FLASK_DEBUG=True
+FLASK_HOST=127.0.0.1
+FLASK_PORT=5000
+SECRET_KEY=your-secret-key-here
+
+# Database Configuration
+DATABASE_URL=postgresql://username:password@localhost/personal_finance_dev
+DEV_DATABASE_URL=postgresql://username:password@localhost/personal_finance_dev
+TEST_DATABASE_URL=sqlite:///:memory:
+
+# Development Settings
+SQLALCHEMY_ECHO=True
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..110b0a6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
+.env
diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..e4fba21
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.12
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..c5872a6
--- /dev/null
+++ b/app/__init__.py
@@ -0,0 +1,108 @@
+"""
+Personal Finance API - Application Factory
+
+This module implements the Flask application factory pattern following Flask 3.0 best practices.
+"""
+
+import os
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+from flask_cors import CORS
+
+from app.extensions import db, migrate
+from app.config import get_config
+
+
+def create_app(config_name=None):
+    """
+    Application factory function that creates and configures a Flask application instance.
+    
+    Args:
+        config_name (str): Configuration name ('development', 'testing', 'production')
+                          If None, uses FLASK_ENV environment variable or defaults to 'development'
+    
+    Returns:
+        Flask: Configured Flask application instance
+    """
+    app = Flask(__name__)
+    
+    # Load configuration
+    if config_name is None:
+        config_name = os.getenv('FLASK_ENV', 'development')
+    
+    config = get_config(config_name)
+    app.config.from_object(config)
+    
+    # Initialize CORS for frontend integration
+    CORS(app, origins=['*'])  # Allow all origins for development
+    
+    # Initialize extensions
+    db.init_app(app)
+    migrate.init_app(app, db)
+    
+    # Import models so they are registered with SQLAlchemy
+    from app.models import Category, Transaction
+    
+    # Register blueprints
+    register_blueprints(app)
+    
+    # Register error handlers
+    register_error_handlers(app)
+    
+    return app
+
+
+def register_blueprints(app):
+    """Register Flask blueprints with the application."""
+    from app.api.categories import categories_bp
+    from app.api.transactions import transactions_bp
+    from app.api.analytics import analytics_bp
+    
+    # Register API blueprints with proper URL prefixes
+    app.register_blueprint(categories_bp, url_prefix='/api/v1/categories')
+    app.register_blueprint(transactions_bp, url_prefix='/api/v1/transactions')
+    app.register_blueprint(analytics_bp, url_prefix='/api/v1/analytics')
+
+
+def register_error_handlers(app):
+    """Register custom error handlers for the application."""
+    from flask import jsonify
+    from marshmallow import ValidationError
+    
+    @app.errorhandler(ValidationError)
+    def handle_validation_error(e):
+        """Handle Marshmallow validation errors."""
+        return jsonify({
+            'success': False,
+            'error': 'validation_failed',
+            'message': 'Input validation failed',
+            'details': e.messages
+        }), 400
+    
+    @app.errorhandler(404)
+    def handle_not_found(e):
+        """Handle 404 errors."""
+        return jsonify({
+            'success': False,
+            'error': 'not_found',
+            'message': 'Resource not found'
+        }), 404
+    
+    @app.errorhandler(500)
+    def handle_internal_error(e):
+        """Handle 500 errors."""
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'An internal server error occurred'
+        }), 500
+    
+    @app.route('/health')
+    def health_check():
+        """Health check endpoint for monitoring."""
+        return jsonify({
+            'success': True,
+            'status': 'healthy',
+            'message': 'Personal Finance API is running'
+        })
diff --git a/app/api/__init__.py b/app/api/__init__.py
new file mode 100644
index 0000000..2900483
--- /dev/null
+++ b/app/api/__init__.py
@@ -0,0 +1,13 @@
+"""
+API Blueprints
+
+This module contains Flask blueprints for API endpoints.
+Each major feature area has its own blueprint for clean organization.
+"""
+
+from .categories import categories_bp
+from .transactions import transactions_bp
+from .analytics import analytics_bp
+
+# Export all blueprints
+__all__ = ['categories_bp', 'transactions_bp', 'analytics_bp']
diff --git a/app/api/analytics.py b/app/api/analytics.py
new file mode 100644
index 0000000..a8723fe
--- /dev/null
+++ b/app/api/analytics.py
@@ -0,0 +1,202 @@
+"""
+Analytics API Blueprint
+
+This module contains API endpoints for financial analytics and reporting.
+Provides summary statistics and spending analysis.
+"""
+
+from flask import Blueprint, jsonify, request
+from sqlalchemy import func
+from datetime import datetime, date
+from marshmallow import ValidationError
+
+from app.models import Transaction, Category
+from app.extensions import db
+
+# Create analytics blueprint
+analytics_bp = Blueprint('analytics', __name__)
+
+
+@analytics_bp.route('/summary', methods=['GET'])
+def get_summary():
+    """
+    Get financial summary analytics.
+    
+    Query Parameters:
+    - start_date: string (YYYY-MM-DD) - Filter from date (optional)
+    - end_date: string (YYYY-MM-DD) - Filter to date (optional)
+    
+    Returns:
+    - 200: Summary statistics including total income, expenses, and balance
+    """
+    try:
+        # Parse optional date filters
+        start_date = request.args.get('start_date')
+        end_date = request.args.get('end_date')
+        
+        # Base query
+        query = Transaction.query
+        
+        # Apply date filters if provided
+        if start_date:
+            try:
+                start_date_obj = datetime.strptime(start_date, '%Y-%m-%d').date()
+                query = query.filter(Transaction.transaction_date >= start_date_obj)
+            except ValueError:
+                return jsonify({
+                    'success': False,
+                    'error': 'validation_failed',
+                    'message': 'Invalid start_date format. Use YYYY-MM-DD'
+                }), 400
+        
+        if end_date:
+            try:
+                end_date_obj = datetime.strptime(end_date, '%Y-%m-%d').date()
+                query = query.filter(Transaction.transaction_date <= end_date_obj)
+            except ValueError:
+                return jsonify({
+                    'success': False,
+                    'error': 'validation_failed',
+                    'message': 'Invalid end_date format. Use YYYY-MM-DD'
+                }), 400
+        
+        # Calculate summary statistics
+        total_income = query.filter(Transaction.type == 'income').with_entities(
+            func.coalesce(func.sum(Transaction.amount), 0)
+        ).scalar() or 0
+        
+        total_expenses = query.filter(Transaction.type == 'expense').with_entities(
+            func.coalesce(func.sum(Transaction.amount), 0)
+        ).scalar() or 0
+        
+        transaction_count = query.count()
+        
+        # Calculate net balance (income - expenses)
+        net_balance = float(total_income) - float(total_expenses)
+        
+        summary_data = {
+            'total_income': float(total_income),
+            'total_expenses': float(total_expenses),
+            'net_balance': net_balance,
+            'transaction_count': transaction_count
+        }
+        
+        return jsonify({
+            'success': True,
+            'data': summary_data,
+            'message': 'Financial summary calculated successfully'
+        }), 200
+        
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to retrieve analytics summary'
+        }), 500
+
+
+@analytics_bp.route('/spending-by-category', methods=['GET'])
+def get_spending_by_category():
+    """
+    Get spending breakdown by category.
+    
+    Query Parameters:
+    - start_date: string (YYYY-MM-DD) - Filter from date (optional)
+    - end_date: string (YYYY-MM-DD) - Filter to date (optional)
+    - type: string (income/expense) - Filter by transaction type (default: expense)
+    
+    Returns:
+    - 200: Spending breakdown by category
+    """
+    try:
+        # Parse optional filters
+        start_date = request.args.get('start_date')
+        end_date = request.args.get('end_date')
+        transaction_type = request.args.get('type', 'expense')
+        
+        # Validate transaction type
+        if transaction_type not in ['income', 'expense']:
+            return jsonify({
+                'success': False,
+                'error': 'validation_failed',
+                'message': 'Type must be either "income" or "expense"'
+            }), 400
+        
+        # Base query - join with Category for category names
+        query = db.session.query(
+            Category.id,
+            Category.name,
+            Category.color,
+            func.sum(Transaction.amount).label('total_amount'),
+            func.count(Transaction.id).label('transaction_count')
+        ).outerjoin(
+            Transaction, 
+            (Category.id == Transaction.category_id) & 
+            (Transaction.type == transaction_type)
+        ).group_by(Category.id, Category.name, Category.color)
+        
+        # Apply date filters if provided
+        if start_date:
+            try:
+                start_date_obj = datetime.strptime(start_date, '%Y-%m-%d').date()
+                query = query.filter(Transaction.transaction_date >= start_date_obj)
+            except ValueError:
+                return jsonify({
+                    'success': False,
+                    'error': 'validation_failed',
+                    'message': 'Invalid start_date format. Use YYYY-MM-DD'
+                }), 400
+        
+        if end_date:
+            try:
+                end_date_obj = datetime.strptime(end_date, '%Y-%m-%d').date()
+                query = query.filter(Transaction.transaction_date <= end_date_obj)
+            except ValueError:
+                return jsonify({
+                    'success': False,
+                    'error': 'validation_failed',
+                    'message': 'Invalid end_date format. Use YYYY-MM-DD'
+                }), 400
+        
+        # Execute query and format results
+        results = query.all()
+        
+        # Calculate total for percentage calculation
+        total_amount = sum(float(result.total_amount or 0) for result in results)
+        
+        category_data = []
+        for result in results:
+            amount = float(result.total_amount or 0)
+            percentage = (amount / total_amount * 100) if total_amount > 0 else 0
+            
+            # Only include categories that have transactions
+            if amount > 0:
+                category_data.append({
+                    'category_id': result.id,
+                    'category_name': result.name,
+                    'category_color': result.color,
+                    'total_amount': amount,
+                    'transaction_count': result.transaction_count,
+                    'percentage': round(percentage, 2)
+                })
+        
+        # Sort by total amount descending
+        category_data.sort(key=lambda x: x['total_amount'], reverse=True)
+        
+        return jsonify({
+            'success': True,
+            'data': category_data,
+            'summary': {
+                'total_amount': total_amount,
+                'category_count': len(category_data),
+                'transaction_type': transaction_type
+            },
+            'message': f'{transaction_type.title()} breakdown by category calculated successfully'
+        }), 200
+        
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to retrieve spending by category'
+        }), 500
diff --git a/app/api/categories.py b/app/api/categories.py
new file mode 100644
index 0000000..b6bdc97
--- /dev/null
+++ b/app/api/categories.py
@@ -0,0 +1,331 @@
+"""
+Categories API Blueprint
+
+This module contains API endpoints for category management.
+Handles CRUD operations for transaction categories with full validation.
+"""
+
+from flask import Blueprint, request, jsonify
+from marshmallow import ValidationError
+from sqlalchemy.exc import IntegrityError
+from typing import Dict, Any
+
+from app.models import Category
+from app.schemas import CategoryCreateSchema, CategoryUpdateSchema, CategoryListSchema
+from app.extensions import db
+
+# Create categories blueprint
+categories_bp = Blueprint('categories', __name__)
+
+# Initialize schemas
+category_create_schema = CategoryCreateSchema()
+category_update_schema = CategoryUpdateSchema()
+category_list_schema = CategoryListSchema(many=True)
+category_detail_schema = CategoryListSchema()
+
+
+@categories_bp.route('/', methods=['GET'])
+def get_categories():
+    """
+    Get all categories with optional transaction counts.
+    
+    Query Parameters:
+    - include_counts: boolean (default: false) - Include transaction counts
+    - active_only: boolean (default: true) - Show only active categories
+    
+    Returns:
+    - 200: List of categories
+    """
+    try:
+        # Parse query parameters
+        include_counts = request.args.get('include_counts', 'false').lower() == 'true'
+        active_only = request.args.get('active_only', 'true').lower() == 'true'
+        
+        if include_counts:
+            # Use efficient query method to get categories with counts
+            categories_with_counts = Category.get_categories_with_counts()
+            
+            # Filter by active status if requested
+            if active_only:
+                categories_with_counts = [
+                    (cat, count) for cat, count in categories_with_counts 
+                    if cat.is_active
+                ]
+            
+            # Format response with counts
+            data = []
+            for category, count in categories_with_counts:
+                cat_dict = category_detail_schema.dump(category)
+                cat_dict['transaction_count'] = count
+                data.append(cat_dict)
+        else:
+            # Regular query without counts
+            if active_only:
+                categories = Category.get_active_categories()
+            else:
+                categories = Category.query.all()
+            
+            data = category_list_schema.dump(categories)
+        
+        return jsonify({
+            'success': True,
+            'data': data,
+            'count': len(data)
+        }), 200
+        
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to retrieve categories'
+        }), 500
+
+
+@categories_bp.route('/', methods=['POST'])
+def create_category():
+    """
+    Create a new category.
+    
+    Request Body:
+    - name: string (required) - Category name (unique)
+    - description: string (optional) - Category description
+    - color: string (optional) - Hex color code
+    - is_active: boolean (optional, default: true)
+    
+    Returns:
+    - 201: Created category
+    - 400: Validation error
+    - 409: Category name already exists
+    """
+    try:
+        # Validate and deserialize request data
+        json_data = request.get_json()
+        if not json_data:
+            return jsonify({
+                'success': False,
+                'error': 'validation_failed',
+                'message': 'No JSON data provided'
+            }), 400
+        
+        validated_data = category_create_schema.load(json_data)
+        
+        # Check if category name already exists
+        existing_category = Category.find_by_name(validated_data['name'])
+        if existing_category:
+            return jsonify({
+                'success': False,
+                'error': 'conflict',
+                'message': f'Category with name "{validated_data["name"]}" already exists'
+            }), 409
+        
+        # Create new category
+        category = Category(**validated_data)
+        db.session.add(category)
+        db.session.commit()
+        
+        # Return created category
+        return jsonify({
+            'success': True,
+            'data': category_detail_schema.dump(category),
+            'message': 'Category created successfully'
+        }), 201
+        
+    except ValidationError as e:
+        return jsonify({
+            'success': False,
+            'error': 'validation_failed',
+            'message': 'Input validation failed',
+            'details': e.messages
+        }), 400
+    
+    except IntegrityError:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'conflict',
+            'message': 'Category name must be unique'
+        }), 409
+    
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to create category'
+        }), 500
+
+
+@categories_bp.route('/<int:category_id>', methods=['GET'])
+def get_category(category_id):
+    """
+    Get a specific category by ID.
+    
+    Path Parameters:
+    - category_id: integer - Category ID
+    
+    Returns:
+    - 200: Category details
+    - 404: Category not found
+    """
+    try:
+        category = Category.query.get(category_id)
+        if not category:
+            return jsonify({
+                'success': False,
+                'error': 'not_found',
+                'message': f'Category with ID {category_id} not found'
+            }), 404
+        
+        # Get transaction count for this category
+        transaction_count = category.get_transaction_count()
+        
+        data = category_detail_schema.dump(category)
+        data['transaction_count'] = transaction_count
+        
+        return jsonify({
+            'success': True,
+            'data': data
+        }), 200
+        
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to retrieve category'
+        }), 500
+
+
+@categories_bp.route('/<int:category_id>', methods=['PUT'])
+def update_category(category_id):
+    """
+    Update a specific category.
+    
+    Path Parameters:
+    - category_id: integer - Category ID
+    
+    Request Body:
+    - name: string (optional) - Category name
+    - description: string (optional) - Category description
+    - color: string (optional) - Hex color code
+    - is_active: boolean (optional)
+    
+    Returns:
+    - 200: Updated category
+    - 400: Validation error
+    - 404: Category not found
+    - 409: Category name already exists
+    """
+    try:
+        category = Category.query.get(category_id)
+        if not category:
+            return jsonify({
+                'success': False,
+                'error': 'not_found',
+                'message': f'Category with ID {category_id} not found'
+            }), 404
+        
+        # Validate and deserialize request data
+        json_data = request.get_json()
+        if not json_data:
+            return jsonify({
+                'success': False,
+                'error': 'validation_failed',
+                'message': 'No JSON data provided'
+            }), 400
+        
+        validated_data = category_update_schema.load(json_data)
+        
+        # Check if name is being changed and if new name already exists
+        if 'name' in validated_data and validated_data['name'] != category.name:
+            existing_category = Category.find_by_name(validated_data['name'])
+            if existing_category:
+                return jsonify({
+                    'success': False,
+                    'error': 'conflict',
+                    'message': f'Category with name "{validated_data["name"]}" already exists'
+                }), 409
+        
+        # Update category fields
+        for field, value in validated_data.items():
+            setattr(category, field, value)
+        
+        db.session.commit()
+        
+        return jsonify({
+            'success': True,
+            'data': category_detail_schema.dump(category),
+            'message': 'Category updated successfully'
+        }), 200
+        
+    except ValidationError as e:
+        return jsonify({
+            'success': False,
+            'error': 'validation_failed',
+            'message': 'Input validation failed',
+            'details': e.messages
+        }), 400
+    
+    except IntegrityError:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'conflict',
+            'message': 'Category name must be unique'
+        }), 409
+    
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to update category'
+        }), 500
+
+
+@categories_bp.route('/<int:category_id>', methods=['DELETE'])
+def delete_category(category_id):
+    """
+    Soft delete a category (set is_active = False).
+    
+    Path Parameters:
+    - category_id: integer - Category ID
+    
+    Returns:
+    - 200: Category deleted successfully
+    - 404: Category not found
+    - 409: Cannot delete category with transactions
+    """
+    try:
+        category = Category.query.get(category_id)
+        if not category:
+            return jsonify({
+                'success': False,
+                'error': 'not_found',
+                'message': f'Category with ID {category_id} not found'
+            }), 404
+        
+        # Check if category has active transactions
+        transaction_count = category.get_transaction_count()
+        if transaction_count > 0:
+            return jsonify({
+                'success': False,
+                'error': 'conflict',
+                'message': f'Cannot delete category with {transaction_count} transactions. Please reassign or delete transactions first.'
+            }), 409
+        
+        # Soft delete by setting is_active to False
+        category.is_active = False
+        db.session.commit()
+        
+        return jsonify({
+            'success': True,
+            'message': 'Category deleted successfully'
+        }), 200
+        
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to delete category'
+        }), 500
diff --git a/app/api/transactions.py b/app/api/transactions.py
new file mode 100644
index 0000000..1d64565
--- /dev/null
+++ b/app/api/transactions.py
@@ -0,0 +1,364 @@
+"""
+Transactions API Blueprint
+
+This module contains API endpoints for transaction management.
+Handles CRUD operations for financial transactions with validation and filtering.
+"""
+
+from flask import Blueprint, request, jsonify
+from marshmallow import ValidationError
+from sqlalchemy.exc import IntegrityError
+from datetime import datetime, date
+
+from app.models import Transaction, Category
+from app.schemas import (
+    TransactionCreateSchema, TransactionUpdateSchema, 
+    TransactionListSchema, TransactionFilterSchema
+)
+from app.extensions import db
+
+# Create transactions blueprint
+transactions_bp = Blueprint('transactions', __name__)
+
+# Initialize schemas
+transaction_create_schema = TransactionCreateSchema()
+transaction_update_schema = TransactionUpdateSchema()
+transaction_list_schema = TransactionListSchema(many=True)
+transaction_detail_schema = TransactionListSchema()
+transaction_filter_schema = TransactionFilterSchema()
+
+
+@transactions_bp.route('/', methods=['GET'])
+def get_transactions():
+    """
+    Get all transactions with optional filtering.
+    
+    Query Parameters:
+    - type: string (income/expense) - Filter by transaction type
+    - category_id: integer - Filter by category ID
+    - start_date: string (YYYY-MM-DD) - Filter from date
+    - end_date: string (YYYY-MM-DD) - Filter to date
+    - page: integer (default: 1) - Page number for pagination
+    - per_page: integer (default: 20, max: 100) - Items per page
+    
+    Returns:
+    - 200: List of transactions with pagination info
+    """
+    try:
+        # Validate filter parameters
+        filter_data = transaction_filter_schema.load(request.args.to_dict())
+        
+        # Start with base query
+        query = Transaction.query
+        
+        # Apply filters
+        if filter_data.get('type'):
+            query = query.filter(Transaction.type == filter_data['type'])
+        
+        if filter_data.get('category_id'):
+            query = query.filter(Transaction.category_id == filter_data['category_id'])
+        
+        if filter_data.get('start_date'):
+            query = query.filter(Transaction.transaction_date >= filter_data['start_date'])
+        
+        if filter_data.get('end_date'):
+            query = query.filter(Transaction.transaction_date <= filter_data['end_date'])
+        
+        # Order by transaction_date descending, then by created_at descending
+        query = query.order_by(Transaction.transaction_date.desc(), Transaction.created_at.desc())
+        
+        # Pagination
+        page = filter_data['page']
+        per_page = filter_data['per_page']
+        
+        paginated = query.paginate(
+            page=page, 
+            per_page=per_page, 
+            error_out=False
+        )
+        
+        # Serialize transactions with category names
+        transactions_data = []
+        for transaction in paginated.items:
+            data = transaction_detail_schema.dump(transaction)
+            if transaction.category:
+                data['category_name'] = transaction.category.name
+            transactions_data.append(data)
+        
+        return jsonify({
+            'success': True,
+            'data': transactions_data,
+            'pagination': {
+                'page': page,
+                'per_page': per_page,
+                'total': paginated.total,
+                'pages': paginated.pages,
+                'has_next': paginated.has_next,
+                'has_prev': paginated.has_prev
+            }
+        }), 200
+        
+    except ValidationError as e:
+        return jsonify({
+            'success': False,
+            'error': 'validation_failed',
+            'message': 'Filter validation failed',
+            'details': e.messages
+        }), 400
+    
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to retrieve transactions'
+        }), 500
+
+
+@transactions_bp.route('/', methods=['POST'])
+def create_transaction():
+    """
+    Create a new transaction.
+    
+    Request Body:
+    - description: string (required) - Transaction description
+    - amount: number (required) - Transaction amount (max 2 decimal places)
+    - type: string (required) - 'income' or 'expense'
+    - category_id: integer (optional) - Category ID
+    - transaction_date: string (optional, default: today) - Date in YYYY-MM-DD format
+    - notes: string (optional) - Additional notes
+    
+    Returns:
+    - 201: Created transaction
+    - 400: Validation error
+    - 404: Category not found
+    """
+    try:
+        # Validate and deserialize request data
+        json_data = request.get_json()
+        if not json_data:
+            return jsonify({
+                'success': False,
+                'error': 'validation_failed',
+                'message': 'No JSON data provided'
+            }), 400
+        
+        validated_data = transaction_create_schema.load(json_data)
+        
+        # Validate category exists if provided
+        if validated_data.get('category_id'):
+            category = Category.query.get(validated_data['category_id'])
+            if not category:
+                return jsonify({
+                    'success': False,
+                    'error': 'not_found',
+                    'message': f'Category with ID {validated_data["category_id"]} not found'
+                }), 404
+            
+            if not category.is_active:
+                return jsonify({
+                    'success': False,
+                    'error': 'validation_failed',
+                    'message': 'Cannot assign transaction to inactive category'
+                }), 400
+        
+        # Create new transaction
+        transaction = Transaction(**validated_data)
+        db.session.add(transaction)
+        db.session.commit()
+        
+        # Return created transaction with category name
+        data = transaction_detail_schema.dump(transaction)
+        if transaction.category:
+            data['category_name'] = transaction.category.name
+        
+        return jsonify({
+            'success': True,
+            'data': data,
+            'message': 'Transaction created successfully'
+        }), 201
+        
+    except ValidationError as e:
+        return jsonify({
+            'success': False,
+            'error': 'validation_failed',
+            'message': 'Input validation failed',
+            'details': e.messages
+        }), 400
+    
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to create transaction'
+        }), 500
+
+
+@transactions_bp.route('/<int:transaction_id>', methods=['GET'])
+def get_transaction(transaction_id):
+    """
+    Get a specific transaction by ID.
+    
+    Path Parameters:
+    - transaction_id: integer - Transaction ID
+    
+    Returns:
+    - 200: Transaction details with category information
+    - 404: Transaction not found
+    """
+    try:
+        transaction = Transaction.query.get(transaction_id)
+        if not transaction:
+            return jsonify({
+                'success': False,
+                'error': 'not_found',
+                'message': f'Transaction with ID {transaction_id} not found'
+            }), 404
+        
+        # Serialize transaction with category name
+        data = transaction_detail_schema.dump(transaction)
+        if transaction.category:
+            data['category_name'] = transaction.category.name
+        
+        return jsonify({
+            'success': True,
+            'data': data
+        }), 200
+        
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to retrieve transaction'
+        }), 500
+
+
+@transactions_bp.route('/<int:transaction_id>', methods=['PUT'])
+def update_transaction(transaction_id):
+    """
+    Update a specific transaction.
+    
+    Path Parameters:
+    - transaction_id: integer - Transaction ID
+    
+    Request Body:
+    - description: string (optional) - Transaction description
+    - amount: number (optional) - Transaction amount
+    - type: string (optional) - 'income' or 'expense'
+    - category_id: integer (optional) - Category ID
+    - transaction_date: string (optional) - Date in YYYY-MM-DD format
+    - notes: string (optional) - Additional notes
+    
+    Returns:
+    - 200: Updated transaction
+    - 400: Validation error
+    - 404: Transaction or category not found
+    """
+    try:
+        transaction = Transaction.query.get(transaction_id)
+        if not transaction:
+            return jsonify({
+                'success': False,
+                'error': 'not_found',
+                'message': f'Transaction with ID {transaction_id} not found'
+            }), 404
+        
+        # Validate and deserialize request data
+        json_data = request.get_json()
+        if not json_data:
+            return jsonify({
+                'success': False,
+                'error': 'validation_failed',
+                'message': 'No JSON data provided'
+            }), 400
+        
+        validated_data = transaction_update_schema.load(json_data)
+        
+        # Validate category exists if being updated
+        if 'category_id' in validated_data and validated_data['category_id']:
+            category = Category.query.get(validated_data['category_id'])
+            if not category:
+                return jsonify({
+                    'success': False,
+                    'error': 'not_found',
+                    'message': f'Category with ID {validated_data["category_id"]} not found'
+                }), 404
+            
+            if not category.is_active:
+                return jsonify({
+                    'success': False,
+                    'error': 'validation_failed',
+                    'message': 'Cannot assign transaction to inactive category'
+                }), 400
+        
+        # Update transaction fields
+        for field, value in validated_data.items():
+            setattr(transaction, field, value)
+        
+        db.session.commit()
+        
+        # Return updated transaction with category name
+        data = transaction_detail_schema.dump(transaction)
+        if transaction.category:
+            data['category_name'] = transaction.category.name
+        
+        return jsonify({
+            'success': True,
+            'data': data,
+            'message': 'Transaction updated successfully'
+        }), 200
+        
+    except ValidationError as e:
+        return jsonify({
+            'success': False,
+            'error': 'validation_failed',
+            'message': 'Input validation failed',
+            'details': e.messages
+        }), 400
+    
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to update transaction'
+        }), 500
+
+
+@transactions_bp.route('/<int:transaction_id>', methods=['DELETE'])
+def delete_transaction(transaction_id):
+    """
+    Delete a specific transaction.
+    
+    Path Parameters:
+    - transaction_id: integer - Transaction ID
+    
+    Returns:
+    - 200: Transaction deleted successfully
+    - 404: Transaction not found
+    """
+    try:
+        transaction = Transaction.query.get(transaction_id)
+        if not transaction:
+            return jsonify({
+                'success': False,
+                'error': 'not_found',
+                'message': f'Transaction with ID {transaction_id} not found'
+            }), 404
+        
+        # Hard delete the transaction
+        db.session.delete(transaction)
+        db.session.commit()
+        
+        return jsonify({
+            'success': True,
+            'message': 'Transaction deleted successfully'
+        }), 200
+        
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'success': False,
+            'error': 'internal_server_error',
+            'message': 'Failed to delete transaction'
+        }), 500
diff --git a/app/config.py b/app/config.py
new file mode 100644
index 0000000..1fc70f9
--- /dev/null
+++ b/app/config.py
@@ -0,0 +1,97 @@
+"""
+Application Configuration
+
+This module contains configuration classes for different environments.
+Each configuration class inherits from the base Config class and can override
+specific settings as needed.
+"""
+
+import os
+from dotenv import load_dotenv
+
+# Load environment variables from .env file
+load_dotenv()
+
+
+class Config:
+    """Base configuration class with common settings."""
+    
+    # Flask settings
+    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'
+    
+    # Database settings
+    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
+        'postgresql://localhost/personal_finance_dev'
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    SQLALCHEMY_ECHO = False
+    
+    # API settings
+    JSON_SORT_KEYS = False
+    JSONIFY_PRETTYPRINT_REGULAR = True
+
+
+class DevelopmentConfig(Config):
+    """Development environment configuration."""
+    
+    DEBUG = True
+    SQLALCHEMY_ECHO = True  # Log SQL queries in development
+    
+    # Override database URL for development
+    SQLALCHEMY_DATABASE_URI = os.environ.get('DEV_DATABASE_URL') or \
+        'postgresql://localhost/personal_finance_dev'
+
+
+class TestingConfig(Config):
+    """Testing environment configuration."""
+    
+    TESTING = True
+    WTF_CSRF_ENABLED = False
+    
+    # Use in-memory SQLite for testing
+    SQLALCHEMY_DATABASE_URI = os.environ.get('TEST_DATABASE_URL') or \
+        'sqlite:///:memory:'
+
+
+class ProductionConfig(Config):
+    """Production environment configuration."""
+    
+    # Ensure SECRET_KEY is set in production
+    SECRET_KEY = os.environ.get('SECRET_KEY')
+    if not SECRET_KEY:
+        raise ValueError("SECRET_KEY environment variable must be set in production")
+    
+    # Production database URL is required
+    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL')
+    if not SQLALCHEMY_DATABASE_URI:
+        raise ValueError("DATABASE_URL environment variable must be set in production")
+    
+    # Production optimizations
+    SQLALCHEMY_ENGINE_OPTIONS = {
+        'pool_pre_ping': True,
+        'pool_recycle': 300,
+    }
+
+
+# Configuration mapping
+config_map = {
+    'development': DevelopmentConfig,
+    'testing': TestingConfig,
+    'production': ProductionConfig,
+    'default': DevelopmentConfig
+}
+
+
+def get_config(config_name=None):
+    """
+    Get configuration class for the specified environment.
+    
+    Args:
+        config_name (str): Configuration name ('development', 'testing', 'production')
+        
+    Returns:
+        Config: Configuration class instance
+    """
+    if config_name is None:
+        config_name = 'default'
+    
+    return config_map.get(config_name, DevelopmentConfig)
diff --git a/app/extensions.py b/app/extensions.py
new file mode 100644
index 0000000..1223ecf
--- /dev/null
+++ b/app/extensions.py
@@ -0,0 +1,14 @@
+"""
+Flask Extensions
+
+This module initializes Flask extensions following the application factory pattern.
+Extensions are initialized here without an app instance, then bound to the app
+in the create_app function using init_app().
+"""
+
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+
+# Initialize extensions without app instance
+db = SQLAlchemy()
+migrate = Migrate()
diff --git a/app/models/__init__.py b/app/models/__init__.py
new file mode 100644
index 0000000..5544196
--- /dev/null
+++ b/app/models/__init__.py
@@ -0,0 +1,12 @@
+"""
+Database Models
+
+This module contains SQLAlchemy model definitions for the Personal Finance API.
+Models are implemented in separate files and imported here for easy access.
+"""
+
+from .category import Category
+from .transaction import Transaction
+
+# Export all models for easy importing
+__all__ = ['Category', 'Transaction']
diff --git a/app/models/category.py b/app/models/category.py
new file mode 100644
index 0000000..31138ad
--- /dev/null
+++ b/app/models/category.py
@@ -0,0 +1,79 @@
+"""
+Category Model
+
+SQLAlchemy model for transaction categories.
+Handles categorization of financial transactions.
+"""
+
+from datetime import datetime
+from app.extensions import db
+
+
+class Category(db.Model):
+    """
+    Category model for organizing transactions.
+    
+    Attributes:
+        id (int): Primary key
+        name (str): Category name (unique)
+        description (str): Optional description
+        color (str): Hex color code for UI representation
+        is_active (bool): Whether category is active
+        created_at (datetime): Creation timestamp
+    """
+    
+    __tablename__ = 'categories'
+    
+    # Primary key
+    id = db.Column(db.Integer, primary_key=True)
+    
+    # Category information
+    name = db.Column(db.String(100), nullable=False, unique=True)
+    description = db.Column(db.Text)
+    color = db.Column(db.String(7))  # Hex color code (#FFFFFF)
+    is_active = db.Column(db.Boolean, default=True, nullable=False)
+    
+    # Timestamps
+    created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
+    
+    # Relationships
+    transactions = db.relationship('Transaction', backref='category', lazy=True)
+    
+    def __repr__(self):
+        """String representation of Category."""
+        return f'<Category {self.name}>'
+    
+    def to_dict(self):
+        """Convert category to dictionary for JSON serialization."""
+        return {
+            'id': self.id,
+            'name': self.name,
+            'description': self.description,
+            'color': self.color,
+            'is_active': self.is_active,
+            'created_at': self.created_at.isoformat() if self.created_at else None
+        }
+    
+    def get_transaction_count(self):
+        """Get transaction count without loading all transactions."""
+        from app.models.transaction import Transaction
+        return db.session.query(Transaction).filter_by(category_id=self.id).count()
+    
+    @classmethod
+    def get_categories_with_counts(cls):
+        """Get categories with transaction counts efficiently."""
+        from app.models.transaction import Transaction
+        return db.session.query(
+            cls, 
+            db.func.count(Transaction.id).label('transaction_count')
+        ).outerjoin(Transaction).group_by(cls.id).all()
+    
+    @classmethod
+    def get_active_categories(cls):
+        """Get all active categories."""
+        return cls.query.filter_by(is_active=True).all()
+    
+    @classmethod
+    def find_by_name(cls, name):
+        """Find category by name."""
+        return cls.query.filter_by(name=name).first()
diff --git a/app/models/transaction.py b/app/models/transaction.py
new file mode 100644
index 0000000..fdf21ba
--- /dev/null
+++ b/app/models/transaction.py
@@ -0,0 +1,112 @@
+"""
+Transaction Model
+
+SQLAlchemy model for financial transactions.
+Handles income and expense records with precise decimal arithmetic.
+"""
+
+from datetime import datetime, date
+from decimal import Decimal
+from app.extensions import db
+
+
+class Transaction(db.Model):
+    """
+    Transaction model for financial records.
+    
+    Attributes:
+        id (int): Primary key
+        description (str): Transaction description
+        amount (Decimal): Transaction amount (precise decimal)
+        type (str): Transaction type ('income' or 'expense')
+        category_id (int): Foreign key to Category
+        transaction_date (date): Date of transaction
+        notes (str): Optional additional notes
+        created_at (datetime): Creation timestamp
+    """
+    
+    __tablename__ = 'transactions'
+    
+    # Primary key
+    id = db.Column(db.Integer, primary_key=True)
+    
+    # Transaction information
+    description = db.Column(db.String(255), nullable=False)
+    amount = db.Column(db.Numeric(10, 2), nullable=False)  # DECIMAL(10,2) for precise money handling
+    type = db.Column(db.String(10), nullable=False)  # 'income' or 'expense'
+    notes = db.Column(db.Text)
+    
+    # Relationships
+    category_id = db.Column(db.Integer, db.ForeignKey('categories.id'), nullable=True)
+    
+    # Dates
+    transaction_date = db.Column(db.Date, nullable=False, default=date.today)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
+    
+    # Database constraints
+    __table_args__ = (
+        db.CheckConstraint('amount > 0', name='check_amount_positive'),
+        db.CheckConstraint("type IN ('income', 'expense')", name='check_type_valid'),
+    )
+    
+    def __repr__(self):
+        """String representation of Transaction."""
+        return f'<Transaction {self.type}: {self.amount} - {self.description}>'
+    
+    def to_dict(self):
+        """Convert transaction to dictionary for JSON serialization."""
+        return {
+            'id': self.id,
+            'description': self.description,
+            'amount': float(self.amount) if self.amount else 0,
+            'type': self.type,
+            'category_id': self.category_id,
+            'category_name': self.category.name if self.category else None,
+            'transaction_date': self.transaction_date.isoformat() if self.transaction_date else None,
+            'notes': self.notes,
+            'created_at': self.created_at.isoformat() if self.created_at else None
+        }
+    
+    @property
+    def amount_decimal(self):
+        """Get amount as Decimal object for precise calculations."""
+        return Decimal(str(self.amount)) if self.amount else Decimal('0')
+    
+    @classmethod
+    def get_by_type(cls, transaction_type):
+        """Get transactions by type (income/expense)."""
+        return cls.query.filter_by(type=transaction_type).all()
+    
+    @classmethod
+    def get_by_date_range(cls, start_date, end_date):
+        """Get transactions within date range."""
+        return cls.query.filter(
+            cls.transaction_date >= start_date,
+            cls.transaction_date <= end_date
+        ).all()
+    
+    @classmethod
+    def get_by_category(cls, category_id):
+        """Get transactions by category."""
+        return cls.query.filter_by(category_id=category_id).all()
+    
+    @classmethod
+    def calculate_total_by_type(cls, transaction_type):
+        """Calculate total amount for a transaction type."""
+        result = db.session.query(db.func.sum(cls.amount)).filter_by(type=transaction_type).scalar()
+        return Decimal(str(result)) if result else Decimal('0')
+    
+    @classmethod
+    def get_summary_stats(cls):
+        """Get summary statistics for all transactions."""
+        total_income = cls.calculate_total_by_type('income')
+        total_expenses = cls.calculate_total_by_type('expense')
+        net_balance = total_income - total_expenses
+        transaction_count = cls.query.count()
+        
+        return {
+            'total_income': float(total_income),
+            'total_expenses': float(total_expenses),
+            'net_balance': float(net_balance),
+            'transaction_count': transaction_count
+        }
diff --git a/app/schemas/__init__.py b/app/schemas/__init__.py
new file mode 100644
index 0000000..3cd628e
--- /dev/null
+++ b/app/schemas/__init__.py
@@ -0,0 +1,36 @@
+"""
+Marshmallow Schemas
+
+This module contains Marshmallow schemas for request/response validation and serialization.
+Schemas are implemented in separate files and imported here for easy access.
+"""
+
+from .category import (
+    CategorySchema,
+    CategoryCreateSchema,
+    CategoryUpdateSchema,
+    CategoryListSchema
+)
+
+from .transaction import (
+    TransactionSchema,
+    TransactionCreateSchema,
+    TransactionUpdateSchema,
+    TransactionListSchema,
+    TransactionFilterSchema,
+    DecimalField
+)
+
+# Export all schemas for easy importing
+__all__ = [
+    'CategorySchema',
+    'CategoryCreateSchema', 
+    'CategoryUpdateSchema',
+    'CategoryListSchema',
+    'TransactionSchema',
+    'TransactionCreateSchema',
+    'TransactionUpdateSchema', 
+    'TransactionListSchema',
+    'TransactionFilterSchema',
+    'DecimalField'
+]
diff --git a/app/schemas/category.py b/app/schemas/category.py
new file mode 100644
index 0000000..888a868
--- /dev/null
+++ b/app/schemas/category.py
@@ -0,0 +1,103 @@
+"""
+Category Marshmallow Schema
+
+Validation and serialization schema for Category model.
+Handles input validation, data transformation, and JSON serialization.
+"""
+
+from marshmallow import Schema, fields, validate, validates, ValidationError
+import re
+
+
+class CategorySchema(Schema):
+    """
+    Schema for Category model validation and serialization.
+    
+    Provides input validation for:
+    - Name: Required, 1-100 characters, unique
+    - Description: Optional text field
+    - Color: Optional hex color code validation
+    - is_active: Boolean field with default True
+    """
+    
+    # Fields with validation
+    id = fields.Integer(dump_only=True)  # Read-only field
+    name = fields.String(
+        required=True,
+        validate=[
+            validate.Length(min=1, max=100, error="Name must be 1-100 characters"),
+            validate.Regexp(
+                r'^[a-zA-Z0-9\s\-_&]+$',
+                error="Name can only contain letters, numbers, spaces, hyphens, underscores, and ampersands"
+            )
+        ]
+    )
+    description = fields.String(
+        allow_none=True,
+        validate=validate.Length(max=500, error="Description cannot exceed 500 characters")
+    )
+    color = fields.String(
+        allow_none=True,
+        validate=validate.Length(equal=7, error="Color must be exactly 7 characters (e.g., #FF5733)")
+    )
+    is_active = fields.Boolean(load_default=True)
+    created_at = fields.DateTime(dump_only=True, format='iso')
+    
+    @validates('color')
+    def validate_color(self, value, **kwargs):
+        """Validate hex color format."""
+        if value is not None:
+            # Check if it's a valid hex color code
+            hex_pattern = r'^#[0-9A-Fa-f]{6}$'
+            if not re.match(hex_pattern, value):
+                raise ValidationError("Color must be a valid hex code (e.g., #FF5733)")
+    
+    class Meta:
+        """Schema configuration."""
+        ordered = True  # Preserve field order in output
+
+
+class CategoryCreateSchema(CategorySchema):
+    """Schema for creating new categories."""
+    
+    class Meta:
+        """Schema configuration for creation."""
+        exclude = ('id', 'created_at')
+        ordered = True
+
+
+class CategoryUpdateSchema(CategorySchema):
+    """Schema for updating existing categories."""
+    
+    # Make all fields optional for partial updates
+    name = fields.String(
+        required=False,
+        validate=[
+            validate.Length(min=1, max=100, error="Name must be 1-100 characters"),
+            validate.Regexp(
+                r'^[a-zA-Z0-9\s\-_&]+$',
+                error="Name can only contain letters, numbers, spaces, hyphens, underscores, and ampersands"
+            )
+        ]
+    )
+    
+    class Meta:
+        """Schema configuration for updates."""
+        exclude = ('id', 'created_at')
+        ordered = True
+
+
+class CategoryListSchema(Schema):
+    """Schema for category list with optional transaction count."""
+    
+    id = fields.Integer()
+    name = fields.String()
+    description = fields.String(allow_none=True)
+    color = fields.String(allow_none=True)
+    is_active = fields.Boolean()
+    created_at = fields.DateTime(format='iso')
+    transaction_count = fields.Integer(allow_none=True)
+    
+    class Meta:
+        """Schema configuration."""
+        ordered = True
diff --git a/app/schemas/transaction.py b/app/schemas/transaction.py
new file mode 100644
index 0000000..663111c
--- /dev/null
+++ b/app/schemas/transaction.py
@@ -0,0 +1,219 @@
+"""
+Transaction Marshmallow Schema
+
+Validation and serialization schema for Transaction model.
+Handles input validation, DECIMAL money precision, and JSON serialization.
+"""
+
+from marshmallow import Schema, fields, validate, validates, ValidationError, post_load
+from decimal import Decimal, InvalidOperation
+from datetime import date
+
+
+class DecimalField(fields.Field):
+    """Custom Decimal field for precise money handling."""
+    
+    def _serialize(self, value, attr, obj, **kwargs):
+        """Convert Decimal to float for JSON serialization."""
+        if value is None:
+            return None
+        return float(value)
+    
+    def _deserialize(self, value, attr, data, **kwargs):
+        """Convert input to Decimal with validation."""
+        if value is None:
+            return None
+        
+        try:
+            # Convert to Decimal and validate precision
+            decimal_value = Decimal(str(value))
+            
+            # Check for more than 2 decimal places
+            exponent = decimal_value.as_tuple().exponent
+            if isinstance(exponent, int) and exponent < -2:
+                raise ValidationError("Amount cannot have more than 2 decimal places")
+            
+            # Check for reasonable range (max 99,999,999.99)
+            if decimal_value > Decimal('99999999.99'):
+                raise ValidationError("Amount cannot exceed $99,999,999.99")
+            
+            if decimal_value <= 0:
+                raise ValidationError("Amount must be greater than 0")
+            
+            return decimal_value
+            
+        except (InvalidOperation, ValueError, TypeError):
+            raise ValidationError("Invalid amount format")
+
+
+class TransactionSchema(Schema):
+    """
+    Schema for Transaction model validation and serialization.
+    
+    Provides input validation for:
+    - Amount: DECIMAL precision with 2 decimal places max
+    - Type: Enum validation (income/expense)
+    - Description: Required text field
+    - Category: Optional foreign key relationship
+    - Date: Transaction date validation
+    """
+    
+    # Fields with validation
+    id = fields.Integer(dump_only=True)  # Read-only field
+    description = fields.String(
+        required=True,
+        validate=[
+            validate.Length(min=1, max=255, error="Description must be 1-255 characters"),
+            validate.Regexp(
+                r'^[a-zA-Z0-9\s\-_.,!@#$%^&*()+=\[\]{}|;:\'\"<>?/~`]+$',
+                error="Description contains invalid characters"
+            )
+        ]
+    )
+    amount = DecimalField(required=True)
+    type = fields.String(
+        required=True,
+        validate=validate.OneOf(
+            ['income', 'expense'],
+            error="Type must be either 'income' or 'expense'"
+        )
+    )
+    category_id = fields.Integer(
+        allow_none=True,
+        validate=validate.Range(min=1, error="Category ID must be a positive integer")
+    )
+    transaction_date = fields.Date(
+        required=True,
+        format='%Y-%m-%d',
+        error_messages={'invalid': 'Date must be in YYYY-MM-DD format'}
+    )
+    notes = fields.String(
+        allow_none=True,
+        validate=validate.Length(max=1000, error="Notes cannot exceed 1000 characters")
+    )
+    created_at = fields.DateTime(dump_only=True, format='iso')
+    
+    # Nested category information for read operations
+    category_name = fields.String(dump_only=True)
+    
+    @validates('transaction_date')
+    def validate_transaction_date(self, value, **kwargs):
+        """Validate transaction date is not in the future."""
+        if value and value > date.today():
+            raise ValidationError("Transaction date cannot be in the future")
+    
+    @post_load
+    def process_data(self, data, **kwargs):
+        """Post-process validated data."""
+        # Set default transaction_date if not provided
+        if 'transaction_date' not in data:
+            data['transaction_date'] = date.today()
+        return data
+    
+    class Meta:
+        """Schema configuration."""
+        ordered = True  # Preserve field order in output
+
+
+class TransactionCreateSchema(TransactionSchema):
+    """Schema for creating new transactions."""
+    
+    class Meta:
+        """Schema configuration for creation."""
+        exclude = ('id', 'created_at', 'category_name')
+        ordered = True
+
+
+class TransactionUpdateSchema(TransactionSchema):
+    """Schema for updating existing transactions."""
+    
+    # Make all fields optional for partial updates
+    description = fields.String(
+        required=False,
+        validate=[
+            validate.Length(min=1, max=255, error="Description must be 1-255 characters"),
+            validate.Regexp(
+                r'^[a-zA-Z0-9\s\-_.,!@#$%^&*()+=\[\]{}|;:\'\"<>?/~`]+$',
+                error="Description contains invalid characters"
+            )
+        ]
+    )
+    amount = DecimalField(required=False)
+    type = fields.String(
+        required=False,
+        validate=validate.OneOf(
+            ['income', 'expense'],
+            error="Type must be either 'income' or 'expense'"
+        )
+    )
+    transaction_date = fields.Date(
+        required=False,
+        format='%Y-%m-%d',
+        error_messages={'invalid': 'Date must be in YYYY-MM-DD format'}
+    )
+    
+    class Meta:
+        """Schema configuration for updates."""
+        exclude = ('id', 'created_at', 'category_name')
+        ordered = True
+
+
+class TransactionListSchema(Schema):
+    """Schema for transaction list with category details."""
+    
+    id = fields.Integer()
+    description = fields.String()
+    amount = DecimalField()
+    type = fields.String()
+    category_id = fields.Integer(allow_none=True)
+    category_name = fields.String(allow_none=True)
+    transaction_date = fields.Date(format='%Y-%m-%d')
+    notes = fields.String(allow_none=True)
+    created_at = fields.DateTime(format='iso')
+    
+    class Meta:
+        """Schema configuration."""
+        ordered = True
+
+
+class TransactionFilterSchema(Schema):
+    """Schema for transaction filtering parameters."""
+    
+    type = fields.String(
+        validate=validate.OneOf(['income', 'expense']),
+        allow_none=True
+    )
+    category_id = fields.Integer(
+        validate=validate.Range(min=1),
+        allow_none=True
+    )
+    start_date = fields.Date(
+        format='%Y-%m-%d',
+        allow_none=True,
+        error_messages={'invalid': 'Start date must be in YYYY-MM-DD format'}
+    )
+    end_date = fields.Date(
+        format='%Y-%m-%d',
+        allow_none=True,
+        error_messages={'invalid': 'End date must be in YYYY-MM-DD format'}
+    )
+    page = fields.Integer(
+        validate=validate.Range(min=1),
+        load_default=1
+    )
+    per_page = fields.Integer(
+        validate=validate.Range(min=1, max=100),
+        load_default=20
+    )
+    
+    @validates('end_date')
+    def validate_date_range(self, value):
+        """Validate end_date is not before start_date."""
+        if value and 'start_date' in self.context:
+            start_date = self.context.get('start_date')
+            if start_date and value < start_date:
+                raise ValidationError("End date cannot be before start date")
+    
+    class Meta:
+        """Schema configuration."""
+        ordered = True
diff --git a/app/utils/__init__.py b/app/utils/__init__.py
new file mode 100644
index 0000000..922aab5
--- /dev/null
+++ b/app/utils/__init__.py
@@ -0,0 +1,7 @@
+"""
+Utility Functions
+
+This module contains helper functions and utilities used across the application.
+"""
+
+# Utility functions will be added here as needed
diff --git a/frontend.html b/frontend.html
new file mode 100644
index 0000000..41b0906
--- /dev/null
+++ b/frontend.html
@@ -0,0 +1,688 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Personal Finance Tracker</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+            background-color: #f5f7fa;
+            color: #333;
+            line-height: 1.6;
+        }
+
+        .container {
+            max-width: 1200px;
+            margin: 0 auto;
+            padding: 20px;
+        }
+
+        header {
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            color: white;
+            text-align: center;
+            padding: 2rem 0;
+            margin-bottom: 2rem;
+            border-radius: 10px;
+            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+        }
+
+        h1 {
+            font-size: 2.5rem;
+            margin-bottom: 0.5rem;
+        }
+
+        .subtitle {
+            font-size: 1.1rem;
+            opacity: 0.9;
+        }
+
+        .section {
+            background: white;
+            margin-bottom: 2rem;
+            padding: 2rem;
+            border-radius: 10px;
+            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+        }
+
+        .section h2 {
+            color: #667eea;
+            margin-bottom: 1.5rem;
+            font-size: 1.8rem;
+            border-bottom: 3px solid #667eea;
+            padding-bottom: 0.5rem;
+        }
+
+        .form-group {
+            margin-bottom: 1rem;
+        }
+
+        label {
+            display: block;
+            margin-bottom: 0.5rem;
+            font-weight: 600;
+            color: #555;
+        }
+
+        input, select, textarea {
+            width: 100%;
+            padding: 0.8rem;
+            border: 2px solid #e1e5e9;
+            border-radius: 5px;
+            font-size: 1rem;
+            transition: border-color 0.3s ease;
+        }
+
+        input:focus, select:focus, textarea:focus {
+            outline: none;
+            border-color: #667eea;
+            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+        }
+
+        button {
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            color: white;
+            border: none;
+            padding: 0.8rem 2rem;
+            border-radius: 5px;
+            cursor: pointer;
+            font-size: 1rem;
+            font-weight: 600;
+            transition: transform 0.2s ease, box-shadow 0.2s ease;
+        }
+
+        button:hover {
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
+        }
+
+        button:active {
+            transform: translateY(0);
+        }
+
+        .btn-danger {
+            background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
+        }
+
+        .btn-danger:hover {
+            box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
+        }
+
+        .form-row {
+            display: grid;
+            grid-template-columns: 1fr 1fr;
+            gap: 1rem;
+        }
+
+        .form-row-3 {
+            display: grid;
+            grid-template-columns: 1fr 1fr 1fr;
+            gap: 1rem;
+        }
+
+        table {
+            width: 100%;
+            border-collapse: collapse;
+            margin-top: 1rem;
+        }
+
+        th, td {
+            padding: 1rem;
+            text-align: left;
+            border-bottom: 1px solid #e1e5e9;
+        }
+
+        th {
+            background-color: #f8f9fa;
+            font-weight: 600;
+            color: #555;
+        }
+
+        .category-color {
+            width: 20px;
+            height: 20px;
+            border-radius: 50%;
+            display: inline-block;
+            margin-right: 0.5rem;
+            border: 2px solid #fff;
+            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
+        }
+
+        .amount-income {
+            color: #28a745;
+            font-weight: 600;
+        }
+
+        .amount-expense {
+            color: #dc3545;
+            font-weight: 600;
+        }
+
+        .stats-grid {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+            gap: 1rem;
+            margin-bottom: 2rem;
+        }
+
+        .stat-card {
+            background: white;
+            padding: 1.5rem;
+            border-radius: 8px;
+            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+            text-align: center;
+            border-left: 4px solid #667eea;
+        }
+
+        .stat-value {
+            font-size: 2rem;
+            font-weight: bold;
+            margin-bottom: 0.5rem;
+        }
+
+        .stat-label {
+            color: #666;
+            font-size: 0.9rem;
+            text-transform: uppercase;
+            letter-spacing: 0.5px;
+        }
+
+        .loading {
+            text-align: center;
+            padding: 2rem;
+            color: #666;
+        }
+
+        .error {
+            background-color: #f8d7da;
+            color: #721c24;
+            padding: 1rem;
+            border-radius: 5px;
+            margin: 1rem 0;
+        }
+
+        .success {
+            background-color: #d4edda;
+            color: #155724;
+            padding: 1rem;
+            border-radius: 5px;
+            margin: 1rem 0;
+        }
+
+        @media (max-width: 768px) {
+            .form-row, .form-row-3 {
+                grid-template-columns: 1fr;
+            }
+            
+            .stats-grid {
+                grid-template-columns: 1fr;
+            }
+            
+            table {
+                font-size: 0.9rem;
+            }
+            
+            th, td {
+                padding: 0.5rem;
+            }
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <header>
+            <h1>💰 Personal Finance Tracker</h1>
+            <p class="subtitle">Manage your income, expenses, and financial goals</p>
+        </header>
+
+        <!-- Analytics Summary Section -->
+        <div class="section">
+            <h2>📊 Financial Summary</h2>
+            <div id="analytics-loading" class="loading">Loading financial data...</div>
+            <div id="analytics-content" style="display: none;">
+                <div class="stats-grid">
+                    <div class="stat-card">
+                        <div class="stat-value amount-income" id="total-income">$0.00</div>
+                        <div class="stat-label">Total Income</div>
+                    </div>
+                    <div class="stat-card">
+                        <div class="stat-value amount-expense" id="total-expenses">$0.00</div>
+                        <div class="stat-label">Total Expenses</div>
+                    </div>
+                    <div class="stat-card">
+                        <div class="stat-value" id="net-balance">$0.00</div>
+                        <div class="stat-label">Net Balance</div>
+                    </div>
+                    <div class="stat-card">
+                        <div class="stat-value" id="transaction-count">0</div>
+                        <div class="stat-label">Transactions</div>
+                    </div>
+                </div>
+                <button onclick="loadAnalytics()">🔄 Refresh Analytics</button>
+            </div>
+        </div>
+
+        <!-- Categories Section -->
+        <div class="section">
+            <h2>🏷️ Categories</h2>
+            
+            <!-- Add Category Form -->
+            <div style="background: #f8f9fa; padding: 1.5rem; border-radius: 8px; margin-bottom: 2rem;">
+                <h3 style="margin-bottom: 1rem; color: #667eea;">Add New Category</h3>
+                <form id="category-form">
+                    <div class="form-row-3">
+                        <div class="form-group">
+                            <label for="category-name">Category Name</label>
+                            <input type="text" id="category-name" required placeholder="e.g., Food, Transportation">
+                        </div>
+                        <div class="form-group">
+                            <label for="category-description">Description</label>
+                            <input type="text" id="category-description" placeholder="Optional description">
+                        </div>
+                        <div class="form-group">
+                            <label for="category-color">Color</label>
+                            <input type="color" id="category-color" value="#667eea">
+                        </div>
+                    </div>
+                    <button type="submit">➕ Add Category</button>
+                </form>
+            </div>
+
+            <!-- Categories List -->
+            <div id="categories-loading" class="loading">Loading categories...</div>
+            <div id="categories-content" style="display: none;">
+                <table id="categories-table">
+                    <thead>
+                        <tr>
+                            <th>Color</th>
+                            <th>Name</th>
+                            <th>Description</th>
+                            <th>Created</th>
+                            <th>Actions</th>
+                        </tr>
+                    </thead>
+                    <tbody id="categories-tbody">
+                    </tbody>
+                </table>
+            </div>
+        </div>
+
+        <!-- Transactions Section -->
+        <div class="section">
+            <h2>💳 Transactions</h2>
+            
+            <!-- Add Transaction Form -->
+            <div style="background: #f8f9fa; padding: 1.5rem; border-radius: 8px; margin-bottom: 2rem;">
+                <h3 style="margin-bottom: 1rem; color: #667eea;">Add New Transaction</h3>
+                <form id="transaction-form">
+                    <div class="form-row">
+                        <div class="form-group">
+                            <label for="transaction-description">Description</label>
+                            <input type="text" id="transaction-description" required placeholder="e.g., Grocery shopping">
+                        </div>
+                        <div class="form-group">
+                            <label for="transaction-amount">Amount</label>
+                            <input type="number" id="transaction-amount" step="0.01" min="0.01" required placeholder="0.00">
+                        </div>
+                    </div>
+                    <div class="form-row-3">
+                        <div class="form-group">
+                            <label for="transaction-type">Type</label>
+                            <select id="transaction-type" required>
+                                <option value="">Select type</option>
+                                <option value="income">💰 Income</option>
+                                <option value="expense">💸 Expense</option>
+                            </select>
+                        </div>
+                        <div class="form-group">
+                            <label for="transaction-category">Category</label>
+                            <select id="transaction-category">
+                                <option value="">No category</option>
+                            </select>
+                        </div>
+                        <div class="form-group">
+                            <label for="transaction-date">Date</label>
+                            <input type="date" id="transaction-date" required>
+                        </div>
+                    </div>
+                    <div class="form-group">
+                        <label for="transaction-notes">Notes (Optional)</label>
+                        <textarea id="transaction-notes" rows="2" placeholder="Additional notes..."></textarea>
+                    </div>
+                    <button type="submit">➕ Add Transaction</button>
+                </form>
+            </div>
+
+            <!-- Transactions List -->
+            <div id="transactions-loading" class="loading">Loading transactions...</div>
+            <div id="transactions-content" style="display: none;">
+                <div style="margin-bottom: 1rem;">
+                    <button onclick="loadTransactions()">🔄 Refresh Transactions</button>
+                </div>
+                <table id="transactions-table">
+                    <thead>
+                        <tr>
+                            <th>Date</th>
+                            <th>Description</th>
+                            <th>Category</th>
+                            <th>Amount</th>
+                            <th>Type</th>
+                            <th>Actions</th>
+                        </tr>
+                    </thead>
+                    <tbody id="transactions-tbody">
+                    </tbody>
+                </table>
+            </div>
+        </div>
+    </div>
+
+    <script>
+        const API_BASE = 'http://127.0.0.1:5000/api/v1';
+        
+        // Initialize the application
+        document.addEventListener('DOMContentLoaded', function() {
+            // Set today's date as default
+            document.getElementById('transaction-date').value = new Date().toISOString().split('T')[0];
+            
+            // Load initial data
+            loadCategories();
+            loadTransactions();
+            loadAnalytics();
+            
+            // Set up form handlers
+            setupFormHandlers();
+        });
+
+        function setupFormHandlers() {
+            // Category form handler
+            document.getElementById('category-form').addEventListener('submit', async function(e) {
+                e.preventDefault();
+                await addCategory();
+            });
+
+            // Transaction form handler
+            document.getElementById('transaction-form').addEventListener('submit', async function(e) {
+                e.preventDefault();
+                await addTransaction();
+            });
+        }
+
+        async function loadCategories() {
+            try {
+                const response = await fetch(`${API_BASE}/categories/`);
+                const data = await response.json();
+                
+                if (data.success) {
+                    displayCategories(data.data);
+                    updateCategoryDropdown(data.data);
+                } else {
+                    showError('Failed to load categories');
+                }
+            } catch (error) {
+                showError('Error loading categories: ' + error.message);
+            }
+        }
+
+        function displayCategories(categories) {
+            const tbody = document.getElementById('categories-tbody');
+            tbody.innerHTML = '';
+
+            categories.forEach(category => {
+                const row = document.createElement('tr');
+                row.innerHTML = `
+                    <td><span class="category-color" style="background-color: ${category.color || '#667eea'}"></span></td>
+                    <td>${category.name}</td>
+                    <td>${category.description || '-'}</td>
+                    <td>${new Date(category.created_at).toLocaleDateString()}</td>
+                    <td>
+                        <button class="btn-danger" onclick="deleteCategory(${category.id})" style="padding: 0.3rem 0.8rem; font-size: 0.8rem;">Delete</button>
+                    </td>
+                `;
+                tbody.appendChild(row);
+            });
+
+            document.getElementById('categories-loading').style.display = 'none';
+            document.getElementById('categories-content').style.display = 'block';
+        }
+
+        function updateCategoryDropdown(categories) {
+            const select = document.getElementById('transaction-category');
+            select.innerHTML = '<option value="">No category</option>';
+            
+            categories.forEach(category => {
+                const option = document.createElement('option');
+                option.value = category.id;
+                option.textContent = category.name;
+                select.appendChild(option);
+            });
+        }
+
+        async function addCategory() {
+            const name = document.getElementById('category-name').value;
+            const description = document.getElementById('category-description').value;
+            const color = document.getElementById('category-color').value;
+
+            try {
+                const response = await fetch(`${API_BASE}/categories/`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify({
+                        name: name,
+                        description: description || null,
+                        color: color
+                    })
+                });
+
+                const data = await response.json();
+                
+                if (data.success) {
+                    showSuccess('Category added successfully!');
+                    document.getElementById('category-form').reset();
+                    document.getElementById('category-color').value = '#667eea';
+                    loadCategories();
+                } else {
+                    showError(data.message || 'Failed to add category');
+                }
+            } catch (error) {
+                showError('Error adding category: ' + error.message);
+            }
+        }
+
+        async function deleteCategory(id) {
+            if (!confirm('Are you sure you want to delete this category?')) return;
+
+            try {
+                const response = await fetch(`${API_BASE}/categories/${id}`, {
+                    method: 'DELETE'
+                });
+
+                const data = await response.json();
+                
+                if (data.success) {
+                    showSuccess('Category deleted successfully!');
+                    loadCategories();
+                } else {
+                    showError(data.message || 'Failed to delete category');
+                }
+            } catch (error) {
+                showError('Error deleting category: ' + error.message);
+            }
+        }
+
+        async function loadTransactions() {
+            try {
+                const response = await fetch(`${API_BASE}/transactions/`);
+                const data = await response.json();
+                
+                if (data.success) {
+                    displayTransactions(data.data);
+                } else {
+                    showError('Failed to load transactions');
+                }
+            } catch (error) {
+                showError('Error loading transactions: ' + error.message);
+            }
+        }
+
+        function displayTransactions(transactions) {
+            const tbody = document.getElementById('transactions-tbody');
+            tbody.innerHTML = '';
+
+            transactions.forEach(transaction => {
+                const row = document.createElement('tr');
+                const amountClass = transaction.type === 'income' ? 'amount-income' : 'amount-expense';
+                const typeIcon = transaction.type === 'income' ? '💰' : '💸';
+                
+                row.innerHTML = `
+                    <td>${new Date(transaction.transaction_date).toLocaleDateString()}</td>
+                    <td>${transaction.description}</td>
+                    <td>${transaction.category_name || '-'}</td>
+                    <td class="${amountClass}">$${parseFloat(transaction.amount).toFixed(2)}</td>
+                    <td>${typeIcon} ${transaction.type}</td>
+                    <td>
+                        <button class="btn-danger" onclick="deleteTransaction(${transaction.id})" style="padding: 0.3rem 0.8rem; font-size: 0.8rem;">Delete</button>
+                    </td>
+                `;
+                tbody.appendChild(row);
+            });
+
+            document.getElementById('transactions-loading').style.display = 'none';
+            document.getElementById('transactions-content').style.display = 'block';
+        }
+
+        async function addTransaction() {
+            const description = document.getElementById('transaction-description').value;
+            const amount = parseFloat(document.getElementById('transaction-amount').value);
+            const type = document.getElementById('transaction-type').value;
+            const categoryId = document.getElementById('transaction-category').value;
+            const date = document.getElementById('transaction-date').value;
+            const notes = document.getElementById('transaction-notes').value;
+
+            try {
+                const payload = {
+                    description: description,
+                    amount: amount,
+                    type: type,
+                    transaction_date: date,
+                    notes: notes || null
+                };
+
+                if (categoryId) {
+                    payload.category_id = parseInt(categoryId);
+                }
+
+                const response = await fetch(`${API_BASE}/transactions/`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(payload)
+                });
+
+                const data = await response.json();
+                
+                if (data.success) {
+                    showSuccess('Transaction added successfully!');
+                    document.getElementById('transaction-form').reset();
+                    document.getElementById('transaction-date').value = new Date().toISOString().split('T')[0];
+                    loadTransactions();
+                    loadAnalytics();
+                } else {
+                    showError(data.message || 'Failed to add transaction');
+                }
+            } catch (error) {
+                showError('Error adding transaction: ' + error.message);
+            }
+        }
+
+        async function deleteTransaction(id) {
+            if (!confirm('Are you sure you want to delete this transaction?')) return;
+
+            try {
+                const response = await fetch(`${API_BASE}/transactions/${id}`, {
+                    method: 'DELETE'
+                });
+
+                const data = await response.json();
+                
+                if (data.success) {
+                    showSuccess('Transaction deleted successfully!');
+                    loadTransactions();
+                    loadAnalytics();
+                } else {
+                    showError(data.message || 'Failed to delete transaction');
+                }
+            } catch (error) {
+                showError('Error deleting transaction: ' + error.message);
+            }
+        }
+
+        async function loadAnalytics() {
+            try {
+                const response = await fetch(`${API_BASE}/analytics/summary`);
+                const data = await response.json();
+                
+                if (data.success) {
+                    displayAnalytics(data.data);
+                } else {
+                    showError('Failed to load analytics');
+                }
+            } catch (error) {
+                showError('Error loading analytics: ' + error.message);
+            }
+        }
+
+        function displayAnalytics(analytics) {
+            document.getElementById('total-income').textContent = `$${parseFloat(analytics.total_income).toFixed(2)}`;
+            document.getElementById('total-expenses').textContent = `$${parseFloat(analytics.total_expenses).toFixed(2)}`;
+            document.getElementById('transaction-count').textContent = analytics.transaction_count;
+            
+            const netBalance = parseFloat(analytics.net_balance);
+            const balanceElement = document.getElementById('net-balance');
+            balanceElement.textContent = `$${Math.abs(netBalance).toFixed(2)}`;
+            
+            if (netBalance >= 0) {
+                balanceElement.className = 'stat-value amount-income';
+            } else {
+                balanceElement.className = 'stat-value amount-expense';
+                balanceElement.textContent = `-$${Math.abs(netBalance).toFixed(2)}`;
+            }
+
+            document.getElementById('analytics-loading').style.display = 'none';
+            document.getElementById('analytics-content').style.display = 'block';
+        }
+
+        function showError(message) {
+            const errorDiv = document.createElement('div');
+            errorDiv.className = 'error';
+            errorDiv.textContent = message;
+            document.body.insertBefore(errorDiv, document.body.firstChild);
+            
+            setTimeout(() => {
+                errorDiv.remove();
+            }, 5000);
+        }
+
+        function showSuccess(message) {
+            const successDiv = document.createElement('div');
+            successDiv.className = 'success';
+            successDiv.textContent = message;
+            document.body.insertBefore(successDiv, document.body.firstChild);
+            
+            setTimeout(() => {
+                successDiv.remove();
+            }, 3000);
+        }
+    </script>
+</body>
+</html>
diff --git a/frontend1.html b/frontend1.html
new file mode 100644
index 0000000..144ee63
--- /dev/null
+++ b/frontend1.html
@@ -0,0 +1,669 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Budget Tracker System</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+            background: linear-gradient(135deg, #a8c8ec 0%, #7fb3d3 100%);
+            min-height: 100vh;
+            padding: 20px;
+        }
+
+        .container {
+            max-width: 1400px;
+            margin: 0 auto;
+        }
+
+        .header {
+            text-align: center;
+            margin-bottom: 40px;
+        }
+
+        .header h1 {
+            font-size: 3.5rem;
+            color: #8B7D6B;
+            font-weight: 600;
+            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
+            margin-bottom: 10px;
+        }
+
+        .main-content {
+            background: rgba(255, 255, 255, 0.95);
+            border-radius: 20px;
+            padding: 40px;
+            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
+            backdrop-filter: blur(10px);
+        }
+
+        .layout {
+            display: grid;
+            grid-template-columns: 400px 1fr;
+            gap: 40px;
+            align-items: start;
+        }
+
+        .left-panel {
+            display: flex;
+            flex-direction: column;
+            gap: 30px;
+        }
+
+        .card {
+            background: white;
+            border-radius: 15px;
+            padding: 25px;
+            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
+            border: 1px solid rgba(0, 0, 0, 0.05);
+        }
+
+        .card h3 {
+            font-size: 1.4rem;
+            color: #333;
+            margin-bottom: 20px;
+            font-weight: 600;
+        }
+
+        .form-group {
+            margin-bottom: 20px;
+        }
+
+        .form-group label {
+            display: block;
+            font-size: 1rem;
+            color: #555;
+            margin-bottom: 8px;
+            font-weight: 500;
+        }
+
+        .form-group input,
+        .form-group select {
+            width: 100%;
+            padding: 12px 15px;
+            border: 2px solid #e1e5e9;
+            border-radius: 8px;
+            font-size: 1rem;
+            transition: border-color 0.3s ease;
+            background: #fafafa;
+        }
+
+        .form-group input:focus,
+        .form-group select:focus {
+            outline: none;
+            border-color: #007bff;
+            background: white;
+            box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
+        }
+
+        .btn-primary {
+            width: 100%;
+            background: #007bff;
+            color: white;
+            border: none;
+            padding: 15px;
+            border-radius: 8px;
+            font-size: 1.1rem;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.3s ease;
+            margin-top: 10px;
+        }
+
+        .btn-primary:hover {
+            background: #0056b3;
+            transform: translateY(-2px);
+            box-shadow: 0 5px 15px rgba(0, 123, 255, 0.3);
+        }
+
+        .btn-danger {
+            width: 100%;
+            background: #dc3545;
+            color: white;
+            border: none;
+            padding: 15px;
+            border-radius: 8px;
+            font-size: 1.1rem;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.3s ease;
+        }
+
+        .btn-danger:hover {
+            background: #c82333;
+            transform: translateY(-2px);
+            box-shadow: 0 5px 15px rgba(220, 53, 69, 0.3);
+        }
+
+        .right-panel {
+            display: flex;
+            flex-direction: column;
+            gap: 30px;
+        }
+
+        .stats-row {
+            display: grid;
+            grid-template-columns: repeat(3, 1fr);
+            gap: 20px;
+        }
+
+        .stat-card {
+            background: rgba(135, 206, 250, 0.3);
+            padding: 20px;
+            border-radius: 10px;
+            text-align: center;
+            border: 1px solid rgba(135, 206, 250, 0.5);
+        }
+
+        .stat-card .label {
+            font-size: 0.9rem;
+            color: #2c5aa0;
+            font-weight: 600;
+            margin-bottom: 8px;
+        }
+
+        .stat-card .value {
+            font-size: 1.5rem;
+            font-weight: bold;
+            color: #1a4480;
+        }
+
+        .history-section h3 {
+            font-size: 1.4rem;
+            color: #333;
+            margin-bottom: 20px;
+            font-weight: 600;
+        }
+
+        .expense-table {
+            width: 100%;
+            border-collapse: collapse;
+            background: white;
+            border-radius: 10px;
+            overflow: hidden;
+            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
+        }
+
+        .expense-table th {
+            background: #f8f9fa;
+            padding: 15px;
+            text-align: left;
+            font-weight: 600;
+            color: #555;
+            border-bottom: 2px solid #e9ecef;
+        }
+
+        .expense-table td {
+            padding: 15px;
+            border-bottom: 1px solid #e9ecef;
+            color: #333;
+        }
+
+        .expense-table tr:hover {
+            background: #f8f9fa;
+        }
+
+        .btn-remove {
+            background: #dc3545;
+            color: white;
+            border: none;
+            padding: 6px 12px;
+            border-radius: 5px;
+            font-size: 0.85rem;
+            cursor: pointer;
+            transition: background 0.3s ease;
+        }
+
+        .btn-remove:hover {
+            background: #c82333;
+        }
+
+        .loading {
+            text-align: center;
+            padding: 40px;
+            color: #666;
+            font-size: 1.1rem;
+        }
+
+        .error {
+            background: #f8d7da;
+            color: #721c24;
+            padding: 15px;
+            border-radius: 8px;
+            margin: 15px 0;
+            border: 1px solid #f5c6cb;
+        }
+
+        .success {
+            background: #d4edda;
+            color: #155724;
+            padding: 15px;
+            border-radius: 8px;
+            margin: 15px 0;
+            border: 1px solid #c3e6cb;
+        }
+
+        .empty-state {
+            text-align: center;
+            padding: 40px;
+            color: #666;
+            font-style: italic;
+        }
+
+        @media (max-width: 768px) {
+            .layout {
+                grid-template-columns: 1fr;
+                gap: 30px;
+            }
+            
+            .stats-row {
+                grid-template-columns: 1fr;
+            }
+            
+            .header h1 {
+                font-size: 2.5rem;
+            }
+            
+            .main-content {
+                padding: 20px;
+            }
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <div class="header">
+            <h1>Budget Tracker System</h1>
+        </div>
+
+        <div class="main-content">
+            <div class="layout">
+                <!-- Left Panel -->
+                <div class="left-panel">
+                    <!-- Add Budget Section -->
+                    <div class="card">
+                        <h3>Add Budget</h3>
+                        <form id="budget-form">
+                            <div class="form-group">
+                                <label for="budget-amount">Budget:</label>
+                                <input type="number" id="budget-amount" step="0.01" min="0.01" required placeholder="Enter budget amount">
+                            </div>
+                            <button type="submit" class="btn-primary">Add Budget</button>
+                        </form>
+                    </div>
+
+                    <!-- Add Expense Section -->
+                    <div class="card">
+                        <h3>Add Expense</h3>
+                        <form id="expense-form">
+                            <div class="form-group">
+                                <label for="expense-title">Expense Title:</label>
+                                <input type="text" id="expense-title" required placeholder="Enter expense title">
+                            </div>
+                            <div class="form-group">
+                                <label for="expense-amount">Amount:</label>
+                                <input type="number" id="expense-amount" step="0.01" min="0.01" required placeholder="Enter amount">
+                            </div>
+                            <div class="form-group">
+                                <label for="expense-category">Category:</label>
+                                <select id="expense-category">
+                                    <option value="">No category</option>
+                                </select>
+                            </div>
+                            <button type="submit" class="btn-primary">Add Expense</button>
+                        </form>
+                    </div>
+
+                    <!-- Reset Button -->
+                    <button class="btn-danger" onclick="resetAll()">Reset All</button>
+                </div>
+
+                <!-- Right Panel -->
+                <div class="right-panel">
+                    <!-- Budget Statistics -->
+                    <div class="stats-row">
+                        <div class="stat-card">
+                            <div class="label">Total Budget:</div>
+                            <div class="value" id="total-budget">0.00</div>
+                        </div>
+                        <div class="stat-card">
+                            <div class="label">Total Expenses:</div>
+                            <div class="value" id="total-expenses">0.00</div>
+                        </div>
+                        <div class="stat-card">
+                            <div class="label">Budget Left:</div>
+                            <div class="value" id="budget-left">0.00</div>
+                        </div>
+                    </div>
+
+                    <!-- Expense History -->
+                    <div class="history-section">
+                        <h3>Expense History:</h3>
+                        <div id="expenses-loading" class="loading" style="display: none;">Loading expenses...</div>
+                        <div id="expenses-content">
+                            <table class="expense-table">
+                                <thead>
+                                    <tr>
+                                        <th>Expense Name</th>
+                                        <th>Amount</th>
+                                        <th>Action</th>
+                                    </tr>
+                                </thead>
+                                <tbody id="expenses-tbody">
+                                </tbody>
+                            </table>
+                        </div>
+                        <div id="empty-expenses" class="empty-state" style="display: none;">
+                            No expenses recorded yet
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <script>
+        const API_BASE = 'http://127.0.0.1:5000/api/v1';
+        let totalBudget = 0;
+        let expenses = [];
+
+        // Initialize the application
+        document.addEventListener('DOMContentLoaded', function() {
+            loadCategories();
+            loadExpenses();
+            loadBudgetFromStorage();
+            
+            // Set up form handlers
+            setupFormHandlers();
+        });
+
+        function setupFormHandlers() {
+            // Budget form handler
+            document.getElementById('budget-form').addEventListener('submit', function(e) {
+                e.preventDefault();
+                addBudget();
+            });
+
+            // Expense form handler
+            document.getElementById('expense-form').addEventListener('submit', function(e) {
+                e.preventDefault();
+                addExpense();
+            });
+        }
+
+        function addBudget() {
+            const amount = parseFloat(document.getElementById('budget-amount').value);
+            
+            if (amount > 0) {
+                totalBudget += amount;
+                localStorage.setItem('totalBudget', totalBudget.toString());
+                updateBudgetDisplay();
+                document.getElementById('budget-form').reset();
+                showSuccess('Budget added successfully!');
+            }
+        }
+
+        async function loadCategories() {
+            try {
+                const response = await fetch(`${API_BASE}/categories/`);
+                const data = await response.json();
+                
+                if (data.success) {
+                    updateCategoryDropdown(data.data);
+                }
+            } catch (error) {
+                console.log('Categories not available, using default options');
+                updateCategoryDropdown([]);
+            }
+        }
+
+        function updateCategoryDropdown(categories) {
+            const select = document.getElementById('expense-category');
+            select.innerHTML = '<option value="">No category</option>';
+            
+            // Add default categories if API is not available
+            if (categories.length === 0) {
+                const defaultCategories = [
+                    { id: 'grocery', name: 'Grocery' },
+                    { id: 'electricity', name: 'Electricity' },
+                    { id: 'loan', name: 'Loan' },
+                    { id: 'shopping', name: 'Shopping' },
+                    { id: 'transport', name: 'Transportation' },
+                    { id: 'food', name: 'Food & Dining' }
+                ];
+                
+                defaultCategories.forEach(category => {
+                    const option = document.createElement('option');
+                    option.value = category.id;
+                    option.textContent = category.name;
+                    select.appendChild(option);
+                });
+            } else {
+                categories.forEach(category => {
+                    const option = document.createElement('option');
+                    option.value = category.id;
+                    option.textContent = category.name;
+                    select.appendChild(option);
+                });
+            }
+        }
+
+        async function addExpense() {
+            const title = document.getElementById('expense-title').value;
+            const amount = parseFloat(document.getElementById('expense-amount').value);
+            const categoryId = document.getElementById('expense-category').value;
+            
+            const expense = {
+                id: Date.now(),
+                title: title,
+                amount: amount,
+                category: categoryId || 'uncategorized',
+                date: new Date().toISOString().split('T')[0]
+            };
+
+            // Try to save to API first
+            try {
+                const payload = {
+                    description: title,
+                    amount: amount,
+                    type: 'expense',
+                    transaction_date: expense.date
+                };
+
+                if (categoryId && !isNaN(categoryId)) {
+                    payload.category_id = parseInt(categoryId);
+                }
+
+                const response = await fetch(`${API_BASE}/transactions/`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(payload)
+                });
+
+                if (response.ok) {
+                    // Successfully saved to API
+                    showSuccess('Expense added successfully!');
+                } else {
+                    // API failed, save locally
+                    expenses.push(expense);
+                    localStorage.setItem('expenses', JSON.stringify(expenses));
+                    showSuccess('Expense added (saved locally)!');
+                }
+            } catch (error) {
+                // API not available, save locally
+                expenses.push(expense);
+                localStorage.setItem('expenses', JSON.stringify(expenses));
+                showSuccess('Expense added (saved locally)!');
+            }
+
+            // Always update local display
+            updateExpensesDisplay();
+            updateBudgetDisplay();
+            document.getElementById('expense-form').reset();
+        }
+
+        async function loadExpenses() {
+            // Try to load from API first
+            try {
+                const response = await fetch(`${API_BASE}/transactions/?type=expense`);
+                const data = await response.json();
+                
+                if (data.success && data.data.length > 0) {
+                    // Convert API data to local format
+                    expenses = data.data.map(transaction => ({
+                        id: transaction.id,
+                        title: transaction.description,
+                        amount: parseFloat(transaction.amount),
+                        category: transaction.category_name || 'uncategorized',
+                        date: transaction.transaction_date,
+                        apiId: transaction.id
+                    }));
+                    updateExpensesDisplay();
+                    updateBudgetDisplay();
+                    return;
+                }
+            } catch (error) {
+                console.log('API not available, loading from local storage');
+            }
+
+            // Fallback to local storage
+            const savedExpenses = localStorage.getItem('expenses');
+            if (savedExpenses) {
+                expenses = JSON.parse(savedExpenses);
+                updateExpensesDisplay();
+                updateBudgetDisplay();
+            }
+        }
+
+        function loadBudgetFromStorage() {
+            const savedBudget = localStorage.getItem('totalBudget');
+            if (savedBudget) {
+                totalBudget = parseFloat(savedBudget);
+                updateBudgetDisplay();
+            }
+        }
+
+        function updateExpensesDisplay() {
+            const tbody = document.getElementById('expenses-tbody');
+            const emptyState = document.getElementById('empty-expenses');
+            
+            tbody.innerHTML = '';
+            
+            if (expenses.length === 0) {
+                emptyState.style.display = 'block';
+                document.querySelector('.expense-table').style.display = 'none';
+            } else {
+                emptyState.style.display = 'none';
+                document.querySelector('.expense-table').style.display = 'table';
+                
+                expenses.forEach(expense => {
+                    const row = document.createElement('tr');
+                    row.innerHTML = `
+                        <td>${expense.title}</td>
+                        <td>$${expense.amount.toFixed(2)}</td>
+                        <td>
+                            <button class="btn-remove" onclick="removeExpense(${expense.id})">Remove</button>
+                        </td>
+                    `;
+                    tbody.appendChild(row);
+                });
+            }
+        }
+
+        function updateBudgetDisplay() {
+            const totalExpenses = expenses.reduce((sum, expense) => sum + expense.amount, 0);
+            const budgetLeft = totalBudget - totalExpenses;
+            
+            document.getElementById('total-budget').textContent = totalBudget.toFixed(2);
+            document.getElementById('total-expenses').textContent = totalExpenses.toFixed(2);
+            document.getElementById('budget-left').textContent = budgetLeft.toFixed(2);
+            
+            // Change color based on budget status
+            const budgetLeftElement = document.getElementById('budget-left');
+            if (budgetLeft < 0) {
+                budgetLeftElement.style.color = '#dc3545';
+            } else if (budgetLeft < totalBudget * 0.2) {
+                budgetLeftElement.style.color = '#ffc107';
+            } else {
+                budgetLeftElement.style.color = '#28a745';
+            }
+        }
+
+        async function removeExpense(expenseId) {
+            if (!confirm('Are you sure you want to remove this expense?')) return;
+
+            const expense = expenses.find(e => e.id === expenseId);
+            if (!expense) return;
+
+            // Try to delete from API if it has an API ID
+            if (expense.apiId) {
+                try {
+                    const response = await fetch(`${API_BASE}/transactions/${expense.apiId}`, {
+                        method: 'DELETE'
+                    });
+                    
+                    if (response.ok) {
+                        showSuccess('Expense removed successfully!');
+                    }
+                } catch (error) {
+                    console.log('Could not delete from API, removing locally');
+                }
+            }
+
+            // Remove from local array
+            expenses = expenses.filter(e => e.id !== expenseId);
+            localStorage.setItem('expenses', JSON.stringify(expenses));
+            
+            updateExpensesDisplay();
+            updateBudgetDisplay();
+            showSuccess('Expense removed!');
+        }
+
+        function resetAll() {
+            if (!confirm('Are you sure you want to reset all data? This cannot be undone.')) return;
+            
+            totalBudget = 0;
+            expenses = [];
+            
+            localStorage.removeItem('totalBudget');
+            localStorage.removeItem('expenses');
+            
+            updateBudgetDisplay();
+            updateExpensesDisplay();
+            
+            showSuccess('All data has been reset!');
+        }
+
+        function showError(message) {
+            const errorDiv = document.createElement('div');
+            errorDiv.className = 'error';
+            errorDiv.textContent = message;
+            document.body.insertBefore(errorDiv, document.body.firstChild);
+            
+            setTimeout(() => {
+                errorDiv.remove();
+            }, 5000);
+        }
+
+        function showSuccess(message) {
+            const successDiv = document.createElement('div');
+            successDiv.className = 'success';
+            successDiv.textContent = message;
+            document.body.insertBefore(successDiv, document.body.firstChild);
+            
+            setTimeout(() => {
+                successDiv.remove();
+            }, 3000);
+        }
+    </script>
+</body>
+</html>
diff --git a/instance/personal_finance_dev.db b/instance/personal_finance_dev.db
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diff --git a/main.py b/main.py
new file mode 100644
index 0000000..00069ff
--- /dev/null
+++ b/main.py
@@ -0,0 +1,6 @@
+def main():
+    print("Hello from personal-finance-api!")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/migrations/README b/migrations/README
new file mode 100644
index 0000000..0e04844
--- /dev/null
+++ b/migrations/README
@@ -0,0 +1 @@
+Single-database configuration for Flask.
diff --git a/migrations/alembic.ini b/migrations/alembic.ini
new file mode 100644
index 0000000..ec9d45c
--- /dev/null
+++ b/migrations/alembic.ini
@@ -0,0 +1,50 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic,flask_migrate
+
+[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
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[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
diff --git a/migrations/env.py b/migrations/env.py
new file mode 100644
index 0000000..4c97092
--- /dev/null
+++ b/migrations/env.py
@@ -0,0 +1,113 @@
+import logging
+from logging.config import fileConfig
+
+from flask import current_app
+
+from alembic import context
+
+# 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)
+logger = logging.getLogger('alembic.env')
+
+
+def get_engine():
+    try:
+        # this works with Flask-SQLAlchemy<3 and Alchemical
+        return current_app.extensions['migrate'].db.get_engine()
+    except (TypeError, AttributeError):
+        # this works with Flask-SQLAlchemy>=3
+        return current_app.extensions['migrate'].db.engine
+
+
+def get_engine_url():
+    try:
+        return get_engine().url.render_as_string(hide_password=False).replace(
+            '%', '%%')
+    except AttributeError:
+        return str(get_engine().url).replace('%', '%%')
+
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+config.set_main_option('sqlalchemy.url', get_engine_url())
+target_db = current_app.extensions['migrate'].db
+
+# 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 get_metadata():
+    if hasattr(target_db, 'metadatas'):
+        return target_db.metadatas[None]
+    return target_db.metadata
+
+
+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=get_metadata(), literal_binds=True
+    )
+
+    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.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    conf_args = current_app.extensions['migrate'].configure_args
+    if conf_args.get("process_revision_directives") is None:
+        conf_args["process_revision_directives"] = process_revision_directives
+
+    connectable = get_engine()
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=get_metadata(),
+            **conf_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/migrations/script.py.mako b/migrations/script.py.mako
new file mode 100644
index 0000000..2c01563
--- /dev/null
+++ 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():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/migrations/versions/d0397a2e3a6e_initial_migration_with_category_and_.py b/migrations/versions/d0397a2e3a6e_initial_migration_with_category_and_.py
new file mode 100644
index 0000000..e6f47a8
--- /dev/null
+++ b/migrations/versions/d0397a2e3a6e_initial_migration_with_category_and_.py
@@ -0,0 +1,52 @@
+"""Initial migration with Category and Transaction models
+
+Revision ID: d0397a2e3a6e
+Revises: 
+Create Date: 2025-09-13 16:05:17.087871
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'd0397a2e3a6e'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('categories',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=100), nullable=False),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('color', sa.String(length=7), nullable=True),
+    sa.Column('is_active', sa.Boolean(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('name')
+    )
+    op.create_table('transactions',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('description', sa.String(length=255), nullable=False),
+    sa.Column('amount', sa.Numeric(precision=10, scale=2), nullable=False),
+    sa.Column('type', sa.String(length=10), nullable=False),
+    sa.Column('notes', sa.Text(), nullable=True),
+    sa.Column('category_id', sa.Integer(), nullable=True),
+    sa.Column('transaction_date', sa.Date(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.CheckConstraint("type IN ('income', 'expense')", name='check_type_valid'),
+    sa.CheckConstraint('amount > 0', name='check_amount_positive'),
+    sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('transactions')
+    op.drop_table('categories')
+    # ### end Alembic commands ###
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..ed18957
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,17 @@
+[project]
+name = "personal-finance-api"
+version = "0.1.0"
+description = "Personal Finance Tracking API Backend using Flask and PostgreSQL"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "flask>=3.0.0",
+    "flask-sqlalchemy>=3.1.0",
+    "flask-migrate>=4.0.0",
+    "marshmallow>=3.20.0",
+    "python-dotenv>=1.0.0",
+    "psycopg2-binary>=2.9.0",
+    "pytest>=7.4.0",
+    "pytest-flask>=1.3.0",
+    "flask-cors>=6.0.1",
+]
diff --git a/run.py b/run.py
new file mode 100644
index 0000000..2afbe8a
--- /dev/null
+++ b/run.py
@@ -0,0 +1,28 @@
+"""
+Flask Application Entry Point
+
+This script creates and runs the Flask application using the application factory pattern.
+Use this for development and testing purposes.
+"""
+
+import os
+from app import create_app
+
+# Create application instance
+app = create_app()
+
+if __name__ == '__main__':
+    # Development server configuration
+    debug_mode = os.getenv('FLASK_DEBUG', 'True').lower() == 'true'
+    port = int(os.getenv('FLASK_PORT', 5000))
+    host = os.getenv('FLASK_HOST', '127.0.0.1')
+    
+    print(f"🚀 Starting Personal Finance API on {host}:{port}")
+    print(f"📊 Debug mode: {debug_mode}")
+    print(f"🔧 Environment: {os.getenv('FLASK_ENV', 'development')}")
+    
+    app.run(
+        host=host,
+        port=port,
+        debug=debug_mode
+    )
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 0000000..80b6084
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,402 @@
+version = 1
+revision = 2
+requires-python = ">=3.12"
+
+[[package]]
+name = "alembic"
+version = "1.16.5"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "mako" },
+    { name = "sqlalchemy" },
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/9a/ca/4dc52902cf3491892d464f5265a81e9dff094692c8a049a3ed6a05fe7ee8/alembic-1.16.5.tar.gz", hash = "sha256:a88bb7f6e513bd4301ecf4c7f2206fe93f9913f9b48dac3b78babde2d6fe765e", size = 1969868, upload_time = "2025-08-27T18:02:05.668Z" }
+wheels = [
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+]
+
+[[package]]
+name = "blinker"
+version = "1.9.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/21/28/9b3f50ce0e048515135495f198351908d99540d69bfdc8c1d15b73dc55ce/blinker-1.9.0.tar.gz", hash = "sha256:b4ce2265a7abece45e7cc896e98dbebe6cead56bcf805a3d23136d145f5445bf", size = 22460, upload_time = "2024-11-08T17:25:47.436Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/10/cb/f2ad4230dc2eb1a74edf38f1a38b9b52277f75bef262d8908e60d957e13c/blinker-1.9.0-py3-none-any.whl", hash = "sha256:ba0efaa9080b619ff2f3459d1d500c57bddea4a6b424b60a91141db6fd2f08bc", size = 8458, upload_time = "2024-11-08T17:25:46.184Z" },
+]
+
+[[package]]
+name = "click"
+version = "8.2.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/60/6c/8ca2efa64cf75a977a0d7fac081354553ebe483345c734fb6b6515d96bbc/click-8.2.1.tar.gz", hash = "sha256:27c491cc05d968d271d5a1db13e3b5a184636d9d930f148c50b038f0d0646202", size = 286342, upload_time = "2025-05-20T23:19:49.832Z" }
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+[[package]]
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