remove duplication

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 23.01%. Comparing base (c8f133a) to head (d57e88f). Report is 1 commits behind head on main.

Files	Patch %	Lines
.../pm4/compass/backend/service/TimestampService.java	71.42%	0 Missing and 2 partials :warning:
...a/ch/zhaw/pm4/compass/backend/model/Timestamp.java	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #136 +/- ## ============================================ - Coverage 23.23% 23.01% -0.22% Complexity 251 251 ============================================ Files 98 98 Lines 2587 2581 -6 Branches 398 398 ============================================ - Hits 601 594 -7 - Misses 1833 1834 +1 Partials 153 153 ``` | [Flag](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/136/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/136/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | `63.20% <78.57%> (-0.35%)` | :arrow_down: | | [frontend](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/136/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | `0.60% <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=ZHAW-PM4-Compass#carryforward-flags-in-the-pull-request-comment) to find out more.

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