# MT5 Expert Advisor Operation Guide

## Configuration Settings
```mql5
// RETRY SETTINGS
input int    MaxRetries = 3;       // Number of send attempts
input int    InitialDelayMs = 1000; // First retry delay (milliseconds)

// API SETTINGS
input string ApiBaseUrl = "http://localhost:3000";
input string ApiKey = ""; 
```

## Failure Recovery Behavior
1. **Retry Sequence**  
   - Attempt 1: Immediate send  
   - Attempt 2: 1 second delay  
   - Attempt 3: 2 second delay  
   - Attempt 4: 4 second delay  

2. **Permanent Failures**  
   After exhausting retries:  
   ```mql5
   Print("Permanent failure: ", result, " - ", error);
   // TODO: Implement dead letter queue storage
   ```

3. **Critical Errors**  
   - Network failures: Retried  
   - 4xx Client errors: Not retried  
   - 5xx Server errors: Retried  

## Data Precision
All numeric values use MT5's `double` type (15-digit precision) mapped to:
```javascript
// API expects DECIMAL(18,15)
Joi.number().precision(15)