Ruby on Rails

Ive got 3 types of media. Event, photo and video.

Most of these share common columns (title, description, etc). I am
thinking of creating a 4th model called media. And then event, photo
and video will inherit from media, making media an STI.

Is this a good approach?
I am worried that since all submissions are going into one table (the
media table). Some db performance issues may arise?

What are your thoughts?

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