Follow-up from "Refactor counter implementations to be polymorphic"

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

• Close this issue

The following discussion from !104936 (merged) should be addressed:

• @alberts-gitlab started a discussion: (+1 comment)

  I realized that this is still tied to ProjectStatistics#increment_columns!, which make the class unusable with other models that need counter. This seems to be a separate problem within ProjectStatistics though, where increment on one column has side effects on other columns. It should be tackled separately.