Idk about the sakura's gift, but if we talk about fairness in terms of sakura/sasuke packs which will come back at 10, the redeemable limit should stay the same. But, for the player who already redeemed it on day 1, their redeemable count will be decreased accordingly to the amount they got on day 1. This sounds good to me.

Some players who has a lot of cps might buy all of the packs for fragments refine or breakthrough preparation, and they will be at advantage. But, hasn't it always been this way with this game? Players who has resources, either by spending money or by saving cps and wait for the best time to spend it, they will always have the advantages. I see this as the game mechanic itself. The point is, the game offers stuff equally(the amount) to all players, and the rest depends on the player itself.

I mean, there should be a log file. The game could record our redeem counts individually (if player redeem 1, the redeemable will minus 1). And I think it's not about the engine or the game, it's about the database. We have previous data inside the log file, insert it into the database but only the "redeemable amount" variable, based on the player's ID. I believe it can be done in one go, but it need the correct data structure since it is changing the value of 1 variable, leaving others untouched.

It will be tricky, need a lot of work for the data and idk if I explained myself clearly (I'm bad at this), but I think it's possible. If it's not, then.......too bad .

The question in that case would be why aren`t there people capable of doing that on their side? Supposing your assumption is correct, that would mean 2+ years of the existence of our version (not so sure since I`ve been playing for 9 months) that they have earned money and not invested in improving their team.