:fire: Remove useless code

[codecov[bot]]

Codecov Report

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

Comparison is base (abe8190) 39.94% compared to head (29f9843) 39.99%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #230 +/- ## ========================================== + Coverage 39.94% 39.99% +0.04% ========================================== Files 124 122 -2 Lines 8043 7823 -220 ========================================== - Hits 3213 3129 -84 + Misses 4546 4421 -125 + Partials 284 273 -11 ``` | [Flag](https://app.codecov.io/gh/go-sigma/sigma/pull/230/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | Coverage Δ | | |---|---|---| | [unit-test-mysql](https://app.codecov.io/gh/go-sigma/sigma/pull/230/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `39.99% <ø> (+0.04%)` | :arrow_up: | | [unit-test-postgresql](https://app.codecov.io/gh/go-sigma/sigma/pull/230/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `39.99% <ø> (+0.04%)` | :arrow_up: | | [unit-test-sqlite3](https://app.codecov.io/gh/go-sigma/sigma/pull/230/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `39.99% <ø> (+0.04%)` | :arrow_up: | 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=go-sigma#carryforward-flags-in-the-pull-request-comment) to find out more.

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