Storing user acitivty? PHP, MySQL and Database Design?

The simplest answer is to just use another table, which can contain multiple matches for any key and allow great indexing options.

You do not need a user actions table. To calculate the "score" you can run one querry over multiple tables and multiply the count of matching comments, ratings etc with a multiplier(25 points for a comment, 10 for a rating, ...).

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