fix: Fixed some price pusher edge cases

[akhercha]

Closes #

Introduced changes

• All our fetchers now return the current timestamp for their timestamp column,
• Fixed Ekubo fetcher - URL was wrong

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.84%. Comparing base (3c7942a) to head (83059b7).
Report is 10 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #179       +/-   ##
===========================================
+ Coverage   16.12%   56.84%   +40.72%     
===========================================
  Files           6       22       +16     
  Lines          62      730      +668     
===========================================
+ Hits           10      415      +405     
- Misses         52      315      +263     

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