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For what I know,
Different plugins create different custom fields which they store data in for each new post automatically, once they're enabled.
For example: WP-PostViews plugin puts into every post a custom field called "views" that's then automatically updated with every post view (can be also manually altered) etc.
So finding a suitable plugin that already does the functionality and creates the custom fields for every post is the easiest way to go I guess
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