I would suggest CC0 for both images and database - crediting authors of images and so on seems hassle that noone would do anyway, would impact just people strongly caring about copyright.
If less permissive license is preferred and you want attribution requirements etc - then CC-BY-SA on some specific version for images? And ODBL for database?
Note that you need explicit agreement from contributors to have things on specific license, so it is a good idea to resolve licensing quickly.
I don’t think attribution is a bad idea here, since it would lead people back to the site.
Were it CC0, anyone could just put up a clone of the site content under a different license to steal traffic, possibly even for nefarious purposes (e.g. maybe a pissed off manufacturer wants to take over via SEO shenanigans)
