Fix monthly credit refresh not working for old accounts

[exedev-shelley]

Author: quangdz_11
Channel: #Shelley credits issue (again)
Link: https://discord.com/channels/1405685085923049482/1499992215353692261/1499992215353692261

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Issue

In some old accounts, credit is not being refreshed monthly. Instead, the credit amount remains stuck at the usage left from the previous month.

Context

This issue has been persisting for at least one month, with the reporter confirming they observed it in the previous billing cycle and it continues to occur.

Attachments

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