Best method for "continue game later"

[Gdev-fr]

Hypothesis : a game which don't necessitate to have players in the room all the time

If everyone disconnect (but could reconnect later), what is the best method ?

Do we need to dispose and when someone connect with the roomId,
we need to create the room (with data saved somewhere else) ?

So :

• dispose to avoid in memory data
• save to database when room are disposed (or saving to database at the end of a player turn ?)
• track the player Id to restore the data for each player reconnecting later
• keep a list of reserved roomId to avoid duplicate
• check for already existing roomId when creating new rooms

Are you agree with this ? Or do you think there is a better method ?