# Functions
Balance retrieves the balance of a user with the given ID.
Credit adds the specified amount to the balance of the user with the given ID.
CreditHistory retrieves the credit transaction history of the user with the given ID.
Debit subtracts the specified amount from the balance of the user with the given ID.
DebitHistory retrieves the debit transaction history of the user with the given ID.
History retrieves the transaction history of the user with the given ID.
SetupWalletDB initializes the database with the User and Transaction models.
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# Constants
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DefaultBalance is the default balance for a new user.
# Variables
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# Type aliases
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