refact: remove model db

[codecov-commenter]

Codecov Report

Merging #214 (4791ebc) into master (d45a8f5) will decrease coverage by 5.46%. The diff coverage is 2.27%.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
- Coverage   49.83%   44.36%   -5.47%     
==========================================
  Files          12       12              
  Lines         590      665      +75     
==========================================
+ Hits          294      295       +1     
- Misses        258      332      +74     
  Partials       38       38              

Flag	Coverage Δ
unittests	44.36% <2.27%> (-5.47%)	:arrow_down:

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

Impacted Files	Coverage Δ
internal/model/id.go	100.00% <ø> (ø)
internal/storage/source.go	51.35% <0.00%> (-11.99%)	:arrow_down:
internal/storage/subscription.go	74.22% <0.00%> (ø)
internal/core/core.go	43.42% <2.50%> (-17.83%)	:arrow_down:

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