fix: Remove type creation for postgresql

[frascuchon]

Description

The last alembic migration definitions fail when using PostgreSQL as the database. This PR fixes this by allowing upgrade and downgrade properly. For more info about the problem, see here sqlalchemy/alembic#886

Type of change

(Please delete options that are not relevant. Remember to title the PR according to the type of change)

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

Changes have been tested using a local database to apply migrations (update and downgrade)

Checklist

• I added relevant documentation
• follows the style guidelines of this project
• I did a self-review of my code
• I 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
• I filled out the contributor form (see text above)
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.41 ⚠️

Comparison is base (f8a5c0c) 90.29% compared to head (45f888d) 89.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3438      +/-   ##
==========================================
- Coverage   90.29%   89.88%   -0.41%     
==========================================
  Files         243      243              
  Lines       13226    13226              
==========================================
- Hits        11942    11888      -54     
- Misses       1284     1338      +54     

see 12 files with indirect coverage changes

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