Optimize API authentication flow with caching and token refresh

[sr-857]

Description

Improve authentication performance and user experience in src/api/auth.py.

Current Issues

• Every request validates token against database
• No token refresh mechanism
• High latency on authentication checks

Tasks

• Implement Redis-based token caching
• Add automatic token refresh before expiry
• Create session management with sliding expiration
• Implement JWT token validation optimization
• Add authentication metrics and monitoring
• Create rate limiting for auth endpoints

Acceptance Criteria

• 90% reduction in database queries for auth
• <5ms authentication check latency
• Automatic token refresh implemented
• Session hijacking prevention
• Comprehensive audit logging

Performance Targets

• Auth cache hit rate >95%
• Token validation <5ms
• Support 10k concurrent authenticated users

[Omkarop0808]

Hi @sr-857 I would like to work on this issue please assign it to me.

[purvanshjoshi]

Hi @Omkarop0808, are you still working on this issue or can we close it?