@lebrun78 It’s called hostProductKey in the hosts table. Also, instead of doing this via MySQL - just export all your hosts - modify the export - and then reimport. Web Interface -> Host Management -> Export Hosts -> Export. Make a backup copy of this, modify it with the key, and then re-import.
Tom Elliott posted recently on the arrangement of the import file… let me find that…
If you are unsure which field the product key should go into in the import, just put the product key into one host via the web interface manually, export again, find that host and see how the key is laid out.