Implement Robust API Rate Limiting System

[Drago-03]

Issue: Implement Robust API Rate Limiting System

Description

The current API rate limiting system is inconsistent across endpoints and lacks proper configuration options based on user tiers. We need a standardized rate limiting approach that protects our services while providing appropriate access levels.

Current Implementation Issues

• Inconsistent rate limiting across different API endpoints
• No tier-based rate limiting based on user subscription level
• Missing header information about rate limit status
• No burst handling for legitimate traffic spikes
• Poor logging of rate limit violations
• Insufficient monitoring of rate limit events
• No graceful degradation when approaching limits

Proposed Solution

Implement a comprehensive rate limiting system with:

• Consistent rate limiting across all API endpoints
• Tier-based limits based on user subscription level
• Standard rate limit headers in responses
• Token bucket algorithm for handling traffic bursts
• Detailed logging and monitoring
• Graceful degradation options

Implementation Requirements

• Create a centralized rate limiting middleware/service
• Implement configurable limits based on user tiers
• Add proper response headers (X-RateLimit-Limit, X-RateLimit-Remaining, etc.)
• Create a monitoring dashboard for rate limit events
• Implement alerts for suspicious rate limit patterns
• Document rate limits in API documentation

Acceptance Criteria

• All API endpoints have consistent rate limiting
• Different user tiers have appropriate rate limits
• Rate limit information is returned in response headers
• Burst traffic is handled appropriately
• Rate limit events are properly logged and monitored
• Documentation clearly explains rate limit policies
• System gracefully handles approaching rate limits

Additional Notes

This system should balance security with user experience, ensuring that legitimate users aren't unnecessarily restricted while protecting our infrastructure from abuse.