refactor: Database 설정 통합

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 11.59%. Comparing base (b173e2f) to head (bce64b7). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/src/config.ts	0.00%	3 Missing :warning:
backend/src/histories/histories.controller.ts	0.00%	2 Missing :warning:
backend/src/histories/schema/histories.schema.ts	0.00%	2 Missing :warning:
backend/src/app.module.ts	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #65 +/- ## ========================================== - Coverage 11.68% 11.59% -0.09% ========================================== Files 47 48 +1 Lines 659 664 +5 ========================================== Hits 77 77 - Misses 582 587 +5 ```

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