Connect the app to postgres

[pozsa]

Using 2.0 sqlalchemy style for future compatibility.
The get_db function can be used as a dependency to inject a working
db session where it will be needed.

[codecov-commenter]

Codecov Report

Merging #60 (18d2f38) into main (071e0ce) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #60   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         6    +1     
  Lines           40        67   +27     
=========================================
+ Hits            40        67   +27     

Flag	Coverage Δ
backend	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
backend/app/config.py	100.00% <100.00%> (ø)
backend/app/database.py	100.00% <100.00%> (ø)
backend/app/routers/health.py	100.00% <100.00%> (ø)
backend/app/schemas/health.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 071e0ce...18d2f38. Read the comment docs.

[pozsa]

@minottic wow.. I didn't expect codecov to detect that coverage drop :D
do we want 100% coverage? (I could get the coverage although the test would probably only check the type of information returned cause I don't see a way of getting the values right.)

[minottic]

yes, I think the type or the fact that they are > 0

[pozsa]

I was testing this locally.. I believe we are running into this problem
nedbat/coveragepy#1082

If I run coverage run --concurrency=thread,greenlet --source=app -m pytest without any changes to the current code the reported coverage is 100%

I don't see an option to use the concurrency flag with pytest-cov though.

Should I just change the command to run the tests in the pipeline?

[pozsa]

@minottic what do you think?

[minottic]

sorry I did not realise until now it is out of date. I will re-review once updated