Make the complete emptying of savings easier
Let's say Alice has 1000 HBD in savings
She decides to withdraw everything from her savings and sell all her HBD
Her savings is now left with a balance of 0 HBD, but she still has 100 HBD of interest to claim in 10 days
Problem 1:
10 days later she should claim interest but can't because she hasn't any HBD left to deposit or withdraw to update her savings balance.
To solve this, she will have to find a way to update her savings balance (buy HBD and transfer them to saving, ask someone else to deposit HBD in her savings, ...)
It is not insurmountable but it is not very convenient.
Problem 2:
After claiming the interest left, she will find herself with a new amount in savings that will start generating new interest.
She will have to initiate a new withdrawal and end up with problem 1 again.
Proposed solution:
When users empty their savings (balance=0), the pending interest could be automatically claimed and withdrawn when the initial withdrawal is filled