Agent session to linger longer

[datasciencemonkey]

Customer request - want session to linger longer for atleast a day before clean up runs.

[datasciencemonkey]

the issue was reported by @victoroliveira1

[datasciencemonkey]

This is addressed in the upcoming PR on branch fix/session-linger-1day.

What changed:

• Session timeout bumped from 5 minutes to 24 hours
• Cleanup interval changed from 60s to 15 minutes

How it works — this is defensive by design:

• Active sessions send heartbeats every 30s, which reset the timeout clock. As long as a session is active, it lives indefinitely.
• The 24-hour timeout only kicks in for abandoned sessions (e.g. user closed their tab). If no heartbeat is received for 24 hours, the cleanup thread reaps it.
• If there are no lingering sessions, the cleanup thread simply wakes every 15 min, finds nothing, and goes back to sleep — zero overhead.

TL;DR: sessions stay alive as long as they are in use. Abandoned sessions get 24 hours before automatic termination.