How do I bring back a deleted expense, or see what changed?

A deleted expense or payment shows in Activity with Restore beside its line. Tap it, and it comes back for everyone in the group, with its comments and receipt.

Anyone in the group can restore it, not only whoever deleted it, for as long as its deletion's line is in Activity: a phone shows its latest 500 lines, and a phone that signs in later gets each group's latest 200. It can't be restored in an archived group, or when it would put money on someone who has left. Restoring works offline too, and reaches everyone when you are back online.

Every expense and payment has a History below it: who added it and when, then each change, with who made it, when, and what it changed from and to. History is read from our server, so it needs a connection, and it shows the latest 200 changes.

Activity shows every edit, deletion and restore as it happens, and an edit's line says what it changed.