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  • There are many ways to implement this, as discussed in se.q322271, dba.q17711, dba.q39016. See also "related questions" under each link. Commented Mar 3, 2018 at 9:36
  • and somehow the table intended to be a basic link table ends up becoming the table that holds every business logic, something of a god table of some sort. The problem here is that you are looking at the table as a mere technical detail and it's not. It's one more element of the domain, It's videos of interest and videos of interest might have more properties than the video and the user interest. For example, the reason why the user is interested in the video. Commented Mar 3, 2018 at 17:06