Update use of database in FPS

[albireox]

Fixes #120

[codecov]

Codecov Report

Merging #121 (42d1725) into main (871240d) will decrease coverage by 0.10%.
The diff coverage is 55.45%.

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
- Coverage   65.73%   65.62%   -0.11%     
==========================================
  Files          18       19       +1     
  Lines        2498     2560      +62     
  Branches      464      467       +3     
==========================================
+ Hits         1642     1680      +38     
- Misses        666      692      +26     
+ Partials      190      188       -2     

Impacted Files	Coverage Δ
python/jaeger/fps.py	54.01% <39.62%> (-1.48%)	⬇️
python/jaeger/database.py	69.64% <69.64%> (ø)
python/jaeger/positioner.py	61.53% <100.00%> (ø)
python/jaeger/utils/helpers.py	68.58% <0.00%> (+0.64%)	⬆️

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