Not able to open a new Photos library.

I have a library with ~30k items in it, all sync'd with iCloud Photo Library. The other day, my library wouldn't update and the status line at the bottom said 'Restoring from iCloud'. This remained like this for several days and nothing changed. After reading some posts on Reddit, I decided to repair the library via command +option clicking. Progress went form 0-99% in roughly 2 hours. It stayed at 99% for several days. While working on other tasks, my Mac completely froze up and I ended up having to hard boot it... now the problems have begun.

I am no longer able to open Photos. Opening it gives the following error:

So I have turned off iCloud Photos in my System Preferences. I figured I'd just create a new library and turn iCloud back on, and let Photos download all the images again (knowing full well this will take weeks). I option clicked Photos, hit create new library, named it and saved it, and immediately got a similar error but for the newly created library:

At this point I cannot open Photos with any method. The newly created libraries are there, but if I try to open Photos via opening the library, I get the same error.

Any suggestions?