chore: fix db types

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 42.50%. Comparing base (fff06d0) to head (136bee9). Report is 11 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1577 +/- ## ========================================= Coverage 42.50% 42.50% Complexity 102 102 ========================================= Files 19 19 Lines 327 327 ========================================= Hits 139 139 Misses 188 188 ``` | [Flag](https://app.codecov.io/gh/nextcloud/twofactor_totp/pull/1577/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nextcloud/twofactor_totp/pull/1577/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `42.50% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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