Fixes #125

[Murakle]

Updated background updates events json parsing. Updated tests according to real messages.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 70.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 50.68%. Comparing base (b5f06d9) to head (09c5a4b).

Files with missing lines	Patch %	Lines
models/chat_background.go	70.00%	8 Missing and 4 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   52.58%   50.68%   -1.91%     
==========================================
  Files          26       26              
  Lines        1801     2058     +257     
==========================================
+ Hits          947     1043      +96     
- Misses        814      971     +157     
- Partials       40       44       +4     

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