Session-Based Authentication System

Problem Statement

Session-Based Authentication System Problem Description Implement a session-based authentication system that manages user sessions with unique tokens and configurable time-to-live (TTL) values. Each token has an expiration time calculated by adding the TTL (in seconds) to the creation time. Tokens can be renewed before expiration to extend their validity. The system must support these three operations: generate <token_id> <current_time> : At the current_time , creates a new token with the specified ID. renew <token_id> <current_time> : At the current_time , extends an existing, unexpired token's expiration time. The request is ignored if the token has expired or does not exist. count <current_time> : Returns the number of unexpired tokens at the current_time . Important Note: Token expiration is evaluated before processing any actions at the same timestamp. If a token's expiration time exactly matches the current time, the token is considered expired and c