Is Coinos really okay? This is a Lightning wallet, right? As far as I know, a data loss issue in a Lightning wallet is not just a simple problem of transaction records disappearing; it can lead to significant financial losses. It could be a serious issue where you might lose the entire channel capacity.
Discussion
This is a reason why I think all lightning custodial wallets should implement https://www.spark.money/ protocol, so they can provide self custodial lightning wallet to their users.