ContactsDB: table 'OldContacts'?

I created a backup of my current contacts DB.

printf "vacuum into '/backup/c.db';" | sqlite3 .local/share/system/privileged/Contacts/qtcontacts-sqlite/contacts.db

copied the file somewhere else and try to open it with another tool. It doesn’t matter which one (it’s crap), but it complains about this from the Schema:

CREATE TABLE Details (
 --[...]
 contactId INTEGER REFERENCES "OldContacts" (contactId),
 -- [...]
 );

Table OldContacts indeed does not exist.

Is that normal, and what would be the schema of OldContacts?

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