Feat: add database

[RMCampos]

Description

Add empty Postgres database in the backend.

Fixes Jira Task 221

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Tested locally with Docker Compose.

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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Thanks for the PR!

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