refactor: remove unavailable service

[codecov-commenter]

Codecov Report

Merging #191 (a6d5017) into master (f5b3cd9) will increase coverage by 6.78%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   11.06%   17.84%   +6.78%     
==========================================
  Files          14        8       -6     
  Lines         660      353     -307     
==========================================
- Hits           73       63      -10     
+ Misses        577      280     -297     
  Partials       10       10              

Flag	Coverage Δ
unittests	17.84% <ø> (+6.78%)	:arrow_up:

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Impacted Files	Coverage Δ
internal/model/content.go
internal/model/source.go
internal/model/model.go
internal/model/user.go
internal/model/subscribe.go

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