13d0df0864d017b3d6f1b3c32af93f6c6c09a0fc
This commit introduces the `User` and `Expense` data classes as Room entities. Each entity is accompanied by its corresponding Data Access Object (DAO) with methods for `getAll`, `insert`, and `delete` operations. Additionally, unused comments were removed from `MainViewModel` and an unnecessary preview was removed from `MainActivity`.
Description
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Kotlin
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