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## Overview ## Overview
This service consumes messages from RabbitMQ, retrieves encrypted push tokens from a MySQL database, decrypts them, and sends notifications via the Expo Push API. It includes comprehensive error handling, automatic retries, dead-letter queuing, and Prometheus metrics. This service consumes messages from RabbitMQ, retrieves encrypted push tokens from a MySQL database, decrypts them, and sends notifications via the Expo Push API.
## Features ## Features
- **Asynchronous Architecture**: Built with `asyncio`, `aio_pika`, and `aiomysql` for high-performance concurrent operations
- **Automatic Retry Logic**: Failed notifications are automatically retried up to 5 times with exponential backoff - **Automatic Retry Logic**: Failed notifications are automatically retried up to 5 times with exponential backoff
- **Dead Letter Queue (DLQ)**: Messages that exceed retry limits are moved to a DLQ for manual inspection - **Dead Letter Queue (DLQ)**: Messages that exceed retry limits are moved to a DLQ for manual inspection
- **Health Monitoring**: Database connection pool health checks every 60 seconds
- **Prometheus Metrics**: Real-time monitoring of queue depths and message processing stats - **Prometheus Metrics**: Real-time monitoring of queue depths and message processing stats
- **Token Management**: Automatically expires invalid or unregistered device tokens - **Token Management**: Automatically expires invalid or unregistered device tokens