[mrweasel]

Product data on a webshop. If you have a wide selection of product categories you’ll have a huge number of attributes that aren’t relevant across your categories.

There’s a number of ways to deal with the issue, e.g. a model per category or an EAV database pattern (this is what platforms like Magento does). None are really ideal, but storing the product attributes as JSON works pretty well. Even more so when your database supports querying the JSON blob.