Ledgerly - Personal Finance Management System

Overview

Personal finance management application designed for individual users to track their financial activities across multiple accounts and currencies.

For detailed domain model documentation, see Domain Documentation

Core Features

• Multi-currency support with automatic conversion
• Double-entry bookkeeping system
• Split transactions support
• Multiple account types (cash, credit, debit, etc.)
• Category-based expense tracking

Domain Concepts

Transactions & Operations

• Transaction: Parent entity that groups related financial operations
• Uses double-entry bookkeeping principles (sum of operations must equal zero)
• Supports split transactions with multiple operations
• Each operation tracks amounts in both original and base currencies
• MVP deletion semantics:
  • transactions use soft delete (isTombstone)
  • operations may be soft-deleted in storage, but tombstone operations are not part of the domain/read contract and are treated as filtered-out archived rows

Accounts

• Represents different financial accounts (cash, bank accounts, credit cards)
• Each account has an associated currency
• Balance is tracked through operations

Currencies

• Support for multiple currencies
• Each account has a designated currency
• Operations track:
  • Base currency amount (for reporting)
  • Original currency amount (actual transaction amount)
  • Currency conversion handling

Categories

• Categorizes operations for better financial tracking
• Supports expense and income categorization

Technical Stack

Backend

• Node.js 22.14.0
• Fastify
• SQLite with Drizzle ORM
• Zod for validation

Frontend

• React + TypeScript
• MobX for state management
• TanStack Router
• Tailwind CSS + DaisyUI

Shared Package

• Common types and validations
• Shared constants and utilities

Project Structure

apps/
  backend/     # Fastify backend application
  frontend/    # React frontend application
packages/
  shared/      # Shared types and validations

Development Setup

Prerequisites

• Node.js 22.14.0+
• pnpm 10.10.0+

Installation

# Install dependencies
pnpm install

# Setup environment variables
cp example.env .env

Development

# Start backend in development mode
pnpm --filter backend dev

# Start frontend in development mode
pnpm --filter frontend dev

Database

# Generate migrations
pnpm --filter backend db:generate

# Apply migrations
pnpm --filter backend db:migrate

Architecture Notes

• Uses monorepo structure with pnpm workspaces
• Follows clean architecture principles in backend
• Frontend uses feature-sliced design methodology
• Shared package prevents code duplication between frontend and backend