satmachineadmin/CLAUDE.md

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is the Satoshi Machine Admin Extension for LNBits - a Dollar Cost Averaging (DCA) administration system that integrates with Lamassu ATM machines to automatically distribute Bitcoin to registered clients based on their deposit balances.

Development Commands

Code Quality & Formatting

# Format all code
make format

# Check code quality
make check

# Individual commands
poetry run black .                    # Python formatting
poetry run ruff check . --fix         # Python linting with auto-fix
poetry run ./node_modules/.bin/prettier --write .  # JavaScript formatting
poetry run mypy .                     # Python type checking
poetry run ./node_modules/.bin/pyright # JavaScript type checking

Testing

# Run tests
make test
# or
PYTHONUNBUFFERED=1 DEBUG=true poetry run pytest

Pre-commit Hooks

# Install pre-commit hooks
make install-pre-commit-hook

# Run pre-commit on all files
make pre-commit

Architecture

Core Structure

The Satoshi Machine Admin extension follows LNBits architecture patterns:

• Backend (Python/FastAPI):

  • __init__.py - Extension initialization and router setup
  • models.py - Pydantic data models for DCA system
  • crud.py - Database operations for all DCA entities
  • views.py - Admin dashboard page route
  • views_api.py - DCA API endpoints
  • migrations.py - Database schema (condensed single migration)
  • tasks.py - Background polling and invoice listening
  • transaction_processor.py - Core Lamassu integration logic

• Frontend (Vue.js 3 Options API + Quasar):

  • static/js/index.js - Admin dashboard Vue app
  • templates/myextension/index.html - Admin interface template

Key Conventions

1. Template Syntax Rules:

   • Use {{ }} and {% %} ONLY in index.html files (Jinja2)
   • In Vue components: Use v-text='value' instead of {{ value }}
   • Use :attribute='value' for binding, v-html='value' for HTML content

2. API Patterns:

   • Admin extension uses session-based superuser authentication (no API keys)
   • Client extension uses wallet admin keys for user-specific operations
   • Use LNbits.api.request() for all API calls
   • Destructure responses: const {data} = await LNbits.api.request(...)

3. Component Registration:

   • Templates must be included BEFORE scripts in HTML
   • Components must be registered BEFORE app.mount()

The Magical G Object

The global this.g object provides access to:

• this.g.user - Complete user data including wallets array
• this.g.user.wallets[0].inkey - Invoice key (client extension only)
• this.g.user.wallets[0].adminkey - Admin key (client extension only)
• this.g.wallet - Currently selected wallet

Note: Admin extension uses superuser session authentication, not wallet keys.

Built-in Utilities

• Currency conversion: /api/v1/currencies, /api/v1/conversion
• QR code generation: /api/v1/qrcode/{data} or Quasar VueQrcode component
• WebSocket support: wss://host/api/v1/ws/{id} with POST to /api/v1/ws/{id}/{data}

Configuration Files

• config.json - Extension configuration (name: "DCA Admin")
• manifest.json - Extension manifest for installation
• pyproject.toml - Python dependencies and tool configuration
• package.json - JavaScript dependencies

DCA System Architecture

Core Components

1. Lamassu ATM Integration

• Secure SSH connection to remote Lamassu PostgreSQL database
• Polls cash_out_txs table for new confirmed transactions
• Supports both SSH password and private key authentication
• Read-only database access for security

2. Commission Calculation Engine

• Formula: base_amount = total_amount / (1 + effective_commission)
• Effective commission: commission_percentage * (100 - discount) / 100
• Supports discount percentages for promotional rates
• Separates commission earnings to configurable wallet

3. DCA Distribution System

• Flow Mode: Proportional distribution based on client balance ratios
• Fixed Mode: Daily limit-based allocation (future enhancement)
• Automatic Bitcoin transfers using LNBits internal payment system
• Real-time balance tracking and deduction

4. Audit and Compliance

• Complete transaction audit trail in lamassu_transactions table
• Detailed distribution records in dca_payments table
• Clickable transaction history with distribution breakdowns
• CSV export capabilities for accounting

Database Schema

Core Tables:

• dca_clients - Client registration and DCA mode settings
• dca_deposits - Fiat deposit tracking and confirmation workflow
• dca_payments - Bitcoin payment records and status tracking
• lamassu_config - Database connection and polling configuration
• lamassu_transactions - Complete audit trail of processed ATM transactions

Key Features:

• Single migration (m001_initial_dca_schema) creates complete schema
• UTC timezone handling throughout
• Comprehensive indexing for performance
• Foreign key relationships maintained

API Endpoints

Client Management

• GET /api/v1/dca/clients - List all DCA clients
• GET /api/v1/dca/clients/{id}/balance - Get client balance summary
• POST /api/v1/dca/clients - Create test client (development)

Deposit Administration

• GET /api/v1/dca/deposits - List all deposits
• POST /api/v1/dca/deposits - Create new deposit
• PUT /api/v1/dca/deposits/{id}/status - Confirm deposits

Transaction Processing

• GET /api/v1/dca/transactions - List processed Lamassu transactions
• GET /api/v1/dca/transactions/{id}/distributions - View distribution details
• POST /api/v1/dca/manual-poll - Trigger manual database poll
• POST /api/v1/dca/test-transaction - Process test transaction

Configuration

• GET /api/v1/dca/config - Get Lamassu database configuration
• POST /api/v1/dca/config - Save database and wallet settings
• POST /api/v1/dca/test-connection - Verify connectivity

Frontend Architecture

Vue.js Components

• Dashboard Overview - System status and recent activity
• Client Management - DCA client table with balance tracking
• Deposit Workflow - Quick deposit forms and confirmation
• Transaction History - Lamassu transaction audit with drill-down
• Configuration Panel - Database and wallet setup with testing

Key UX Features

• Real-time balance updates during polling
• Loading states for all async operations
• Error handling with user-friendly notifications
• Responsive design for mobile administration
• Export functionality for audit and compliance

Technical Implementation Details

SSH Connection Setup

# On Lamassu server:
sudo mkdir -p /var/lib/postgresql/.ssh
sudo echo "your-public-key" >> /var/lib/postgresql/.ssh/authorized_keys
sudo chown -R postgres:postgres /var/lib/postgresql/.ssh
sudo chmod 700 /var/lib/postgresql/.ssh
sudo chmod 600 /var/lib/postgresql/.ssh/authorized_keys

Commission Calculation Example

# Real transaction: 2000 GTQ → 266,800 sats (3% commission, 0% discount)
crypto_atoms = 266800  # Total sats from Lamassu
commission_percentage = 0.03  # 3%
discount = 0.0  # No discount

effective_commission = 0.03 * (100 - 0) / 100 = 0.03
base_amount = 266800 / (1 + 0.03) = 258,835 sats (for DCA)
commission_amount = 266800 - 258835 = 7,965 sats (to commission wallet)

Polling Strategy

• Automatic: Hourly background task via LNBits task system
• Manual: Admin-triggered polling for immediate processing
• Smart Recovery: Tracks last successful poll to prevent missed transactions
• Error Handling: Graceful failure with detailed logging

Security Considerations

• Superuser Authentication: Admin extension requires LNBits superuser login
• Wallet Admin Keys: Client extension uses wallet admin keys for user operations
• Database Access: Only superusers can write to satoshimachine database
• SSH tunnel encryption for database connectivity
• Read-only database permissions for Lamassu access
• Input sanitization and type validation
• Audit logging for all administrative actions

No-collision invariant — operator account pubkey ≠ ATM npub

dca_machines.machine_npub and accounts.pubkey MUST NEVER hold the same value across the LNbits instance. Enforced by views_api._assert_no_pubkey_collision at machine-creation time (rejects with HTTP 400) and by the matching SQL check operators can run on existing installs:

SELECT a.id, a.username, a.pubkey, m.id, m.machine_npub
FROM accounts a
JOIN ext_satoshimachine.dca_machines m
  ON LOWER(a.pubkey) = LOWER(m.machine_npub);

Why this matters: when the two values match, lnbits' nostr-transport auth.py:resolve_nostr_auth routes inbound kind-21000 RPCs from the ATM directly to that operator's wallet by collision — it works by coincidence, breaks silently the moment the operator's pubkey rotates (then auto-account-from-npub fires for the orphaned ATM npub, and the invoice lands on a fresh auto-account wallet instead). Reproduced on 2026-05-30 against Greg's Sintra (silent cash-out drop). The proper architectural routing fix is aiolabs/satmachineadmin#20 (path B / S6); the collision guard prevents the broken state from being entered in the first place.

When provisioning a new ATM via lamassu-next deploy/nixos/provision-atm.sh, leave ATM_PRIVATE_KEY unset so the script generates a fresh ATM keypair (distinct from any operator's nsec). See aiolabs/satmachineadmin#32 for design rationale + the (eventual) reverse-direction guard on account creation in lnbits proper.

Development Workflow

Adding New Features

1. Models: Update models.py with new Pydantic schemas
2. Database: Add migration to migrations.py (append only)
3. CRUD: Implement database operations in crud.py
4. API: Add endpoints to views_api.py
5. Frontend: Update Vue.js components in static/js/index.js
6. Templates: Modify HTML template if needed

Testing

• Use "Test Connection" for database connectivity verification
• Use "Test Transaction" for DCA flow validation
• Manual polling for real-world transaction testing
• Monitor LNBits logs for detailed error information

Debugging

• Enable debug logging: DEBUG=true
• Check SSH tunnel connectivity independently
• Verify Lamassu database query results
• Monitor wallet balance changes
• Review transaction audit trail

Key Files Reference

• transaction_processor.py - Core Lamassu integration and DCA logic
• models.py - Complete data models for DCA system
• crud.py - Database operations with optimized queries
• migrations.py - Single condensed schema migration
• static/js/index.js - Admin dashboard Vue.js application
• templates/myextension/index.html - Admin interface template
• config.json - Extension metadata and configuration
• tasks.py - Background polling and invoice listeners

Important Notes

• Extension uses LNBits internal payment system for Bitcoin transfers
• All timestamps stored and processed in UTC timezone
• Commission calculations handle edge cases and rounding
• SSH authentication prefers private keys over passwords
• Database polling is stateful and resumable after downtime
• UI displays human-readable usernames where available
• Export functions generate CSV files for external analysis

Extension Status

Current Version: v0.0.1 (Initial Release)
Status: Production Ready
Dependencies: LNBits v1.0.0+, SSH access to Lamassu server
License: MIT