Help for Aimeos

Hi,
I need to know more about the mshop_media table. The field "preview" is quite hard to understand for me.

How that work?

I have raw data and I want to insert it into that table (links for image products). How the json is created?
I mean, why sometimes you start with

and other times you start with ?

Thank you very much

The JSON in the "preview" column represents the different preview image sizes with the width of the image in px as key (e.g. "240"). If an image doesn't has a size (e.g. SVG) or isn't an image, than "1" px width is used as key.

Thank you very much!