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Looking at it they have purposely hidden it. There is a flag on it to not list this command as part of tabadmin. There are two parameters to pass two it as you've discovered. Create-entry is where the postgress db current schema will be written to. The other is the signature-directory is where it's going to look for the what the schema should be. Why it's failing when you manually run it: No idea! Why it might fail when restoring from backup (guessing at this point): create_entry != signature_schema. Hopefully, that's enough to satisfy your curiosity. If not I can point you to where to look for stuff.
Thanks Gerardo This isn't something I'm worried about but if it's not a lot of work you can add the other info if you like to help others.
I don't think you need to specify options. Take a look at the message: where it says "Expected" and "Actual", there are two text files mentioned. Compare (diff) the two files to see you what you have vs what Tableau was expecting.
There's not much you can do with this, but if you're running into problems related to Tableau's database, then this information could be useful for troubleshooting. If the differences are due to changes you've made to the database, it useful to remember this since that can cause problems down the road.