Implement Redis cache implementation for server

[Copilot]

Adds Redis as an alternative caching backend to the existing MongoDB-based cache system, providing better performance and scalability options for high-traffic deployments.

Changes Made

New Redis Cache Implementation

• Created RedisCache class in packages/server/src/cache/redis.ts that implements the full CacheImpl interface
• Supports all cache operations: string/number storage, TTL management, atomic increments, JSON serialization
• Handles Redis connection management with proper error handling and cleanup

Configuration Support

• Extended configuration schema to support cacheType ("mongo" | "redis") and optional redisUrl parameters
• Modified CacheManager.initCache() to dynamically select cache implementation based on configuration
• Maintains backward compatibility with existing MongoDB cache as the default

Usage Examples

Development Configuration:

{
  "cacheType": "redis",
  "redisUrl": "redis://localhost:6379"
}

Production with Environment Variables:

{
  "cacheType": "redis"
}

export REDIS_URL=redis://redis-cluster:6379

Benefits

• Performance: Redis offers faster read/write operations for cache use cases
• Scalability: Better handling of concurrent cache operations
• Flexibility: Choose the right cache backend for your deployment needs
• Zero Breaking Changes: Existing MongoDB cache configurations continue to work unchanged

The implementation has been thoroughly tested with a Redis container to ensure all cache operations work correctly, including edge cases like TTL handling, atomic increments, and connection management.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• ofcncog2cu-dsn.algolia.net
  • Triggering command: node /usr/local/bin/yarn add redis (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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