rounding is banded and the 5s band biases +3, so 22 goes to 25 not 20. numbers match the csv for arena 1 and 2.
free chest end timestamp needs migration 0002.
if the client presents an id we don't know, create it under that id and bump the sequence past it.
also chest offers match through BaseChest, so one silver row covers every arena.
json stores are gone, they nulled out every data ref on load and wrote the null straight back on save.
shop json and the purchase commands ended up in here too.
