Peak Usage Time

You are given a list of website sessions, where each session is represented as a pair of integers [start, end]. These integers indicate the start and end times (in minutes from the beginning of the day) during which a user was active on the website. Sessions are inclusive of the start time and exclusive of the end time. That is, if one session ends at time T and another begins at time T, they are not considered overlapping.

Your task is to write a function or program that determines:

1. The maximum number of concurrent sessions (i.e., the highest number of users active at the same time).
2. The earliest time interval during which this peak concurrency occurs. This interval should be represented by its start and end times (in minutes).

If the period of peak concurrency spans more than a single minute, return the complete continuous interval during which the number of active sessions remains at the maximum.

You can assume:

• The input list can be empty, in which case you should return an appropriate indication (for example, a peak concurrency of 0 and no interval).
• Session times are valid non-negative integers and the start time is strictly less than the end time for each session.
• The sessions might not be sorted in any order.

Example input:

[[30, 150], [120, 180], [100, 130], [160, 210]]

Expected behavior (for this sample, do not hardcode for this input): Determine the maximum number of concurrent sessions and output the earliest continuous interval during which this maximum is maintained.

Write a complete, self-contained solution that reads such a list (or you can assume the list is provided as a parameter), processes it, and prints or returns the required information.