Improve tests and fix the bugs

[kazhuravlev]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 64.97462% with 69 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.56%. Comparing base (3324f62) to head (5e1f9a2).

Files with missing lines	Patch %	Lines
internal/facade/service.go	0.00%	13 Missing ⚠️
internal/parser/op_delete.go	57.14%	7 Missing and 5 partials ⚠️
internal/parser/op_select.go	83.92%	7 Missing and 2 partials ⚠️
internal/parser/op_update.go	57.89%	4 Missing and 4 partials ⚠️
internal/parser/op_insert.go	61.11%	4 Missing and 3 partials ⚠️
cmd/gateway/main.go	0.00%	6 Missing ⚠️
cmd/gateway/helpers.go	0.00%	4 Missing ⚠️
internal/pgdb/pg_helpers.go	0.00%	4 Missing ⚠️
internal/storage/api.go	0.00%	4 Missing ⚠️
internal/parser/parser.go	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #70       +/-   ##
===========================================
+ Coverage   30.95%   43.56%   +12.60%     
===========================================
  Files          33       33               
  Lines        2358     2417       +59     
===========================================
+ Hits          730     1053      +323     
+ Misses       1558     1287      -271     
- Partials       70       77        +7     

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