Fix persistent cooldown issues

[Pablete1234]

Fixes a couple issues with cooldowns:

• They were being read incorrectly from the database, leading to cooldowns of 4000+ years
• The cooldown was reversed, so it would've stopped being on cooldown N time after, instead of N time before

Additionally improved the /pool command to show the map cooldowns, and added option to query for map names, and exposed a function to get the cooldown as a time period instead of a boolean