Add postgresql schema support.

[angryfoxx]

Description

Checklist

Please update this checklist as you complete each item:

• Tests have been developed for bug fixes or new functionality.
• The changelog has been updated, if necessary.
• Documentation has been updated, if necessary.
• GitHub Issues closed by this PR have been linked.

_{By submitting this pull request I agree that all contributions comply with this project's open source license(s).}

[angryfoxx]

I am not sure that should I update the changelog. @Archmonger what do you think ?

[Archmonger]

Yes. Since this is a feature change, you'll need a changelog bullet point.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.40%. Comparing base (6c11a67) to head (9d8f155).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #507      +/-   ##
==========================================
+ Coverage   91.23%   91.40%   +0.17%     
==========================================
  Files          19       19              
  Lines         856      873      +17     
  Branches      150      157       +7     
==========================================
+ Hits          781      798      +17     
  Misses         40       40              
  Partials       35       35              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Archmonger]

This can be merged after handling the two remaining comments.

EDIT: Actually there are four coverage hits that should be fixed first. See above.

[angryfoxx]

This can be merged after handling the two remaining comments.

EDIT: Actually there are four coverage hits that should be fixed first. See above.

@Archmonger The Schemas only available for Postgres so. I need to patch the database settings while testing. But I failed, could you give an example of how to do it

[Archmonger]

Are you referring to the settings.py values? If so, this PR shows a good example of how to do that via @patch

[angryfoxx]

Hi @Archmonger, Could you review it again? I have created schema test for dbrestore just before and I think everything looks good.

[Archmonger]

Looks good to me.