# Data Service

Market data service for the Trading Platform.

## Features

- **REST API**: FastAPI-based endpoints for market data
- **WebSocket Streaming**: Real-time price updates
- **Multi-Provider Support**: Polygon.io, Binance, MT4/MT5
- **Historical Data**: OHLCV candles with multiple timeframes
- **Spread Tracking**: Broker spread monitoring and statistics
- **Price Adjustment**: ML-based price adjustment models

## Quick Start

```bash
# Install dependencies
pip install -r requirements.txt

# Set environment variables
cp .env.example .env

# Run development server
python -m uvicorn src.app:app --reload --port 8001

# Or with Docker
docker-compose up -d
```

## API Endpoints

### Health
- `GET /health` - Service health status
- `GET /ready` - Kubernetes readiness probe
- `GET /live` - Kubernetes liveness probe

### Symbols
- `GET /api/v1/symbols` - List trading symbols
- `GET /api/v1/symbols/{symbol}` - Get symbol info

### Market Data
- `GET /api/v1/ticker/{symbol}` - Current price
- `GET /api/v1/tickers` - Multiple tickers
- `GET /api/v1/candles/{symbol}` - Historical OHLCV
- `GET /api/v1/orderbook/{symbol}` - Order book snapshot
- `GET /api/v1/trades/{symbol}` - Recent trades

### Admin
- `POST /api/v1/admin/backfill/{symbol}` - Trigger data backfill
- `POST /api/v1/admin/sync` - Trigger sync

## WebSocket

Connect to `/ws/stream` for real-time data.

```javascript
const ws = new WebSocket('ws://localhost:8001/ws/stream');

ws.onopen = () => {
  // Subscribe to ticker updates
  ws.send(JSON.stringify({
    action: 'subscribe',
    channel: 'ticker',
    symbols: ['EURUSD', 'BTCUSD']
  }));
};

ws.onmessage = (event) => {
  const data = JSON.parse(event.data);
  console.log(data);
};
```

### Channels
- `ticker` - Real-time price updates
- `candles` - OHLCV candle updates (specify timeframe)
- `orderbook` - Order book snapshots
- `trades` - Recent trades
- `signals` - ML trading signals

## Architecture

```
src/
├── app.py              # FastAPI application
├── main.py             # Scheduler-based service
├── config.py           # Configuration
├── api/
│   ├── routes.py       # REST endpoints
│   └── dependencies.py # FastAPI dependencies
├── websocket/
│   ├── manager.py      # Connection management
│   └── handlers.py     # WebSocket routes
├── models/
│   └── market.py       # Pydantic models
├── providers/
│   ├── polygon_client.py  # Polygon.io client
│   ├── binance_client.py  # Binance client
│   └── mt4_client.py      # MT4/MetaAPI client
└── services/
    └── price_adjustment.py # Price adjustment service
```

## Environment Variables

```env
# Database
DB_HOST=localhost
DB_PORT=5432
DB_NAME=trading_data
DB_USER=trading_user
DB_PASSWORD=trading_dev_2025

# Polygon.io
POLYGON_API_KEY=your_api_key
POLYGON_TIER=basic

# Binance
BINANCE_API_KEY=your_api_key
BINANCE_API_SECRET=your_secret
BINANCE_TESTNET=false

# MetaAPI (MT4/MT5)
METAAPI_TOKEN=your_token
METAAPI_ACCOUNT_ID=your_account_id

# Service
SYNC_INTERVAL_MINUTES=5
BACKFILL_DAYS=30
LOG_LEVEL=INFO
```

## Development

```bash
# Run tests
pytest

# Code formatting
black src/
isort src/

# Type checking
mypy src/
```

## API Documentation

When running, visit:
- Swagger UI: http://localhost:8001/docs
- ReDoc: http://localhost:8001/redoc