Yes, mostly up to date, mostly correct, fast to access, easy to prove, not the source of the truth. A pretty good analogy. In paper days you would add up

Yes, mostly up to date, mostly correct, fast to access, easy to prove, not the source of the truth. A pretty good analogy. In paper days you would add up your various ledgers (perhaps each in its own book, sales, purchases, cash etc) at the end of each day and check that the whole thing balanced. You didn't get to go home until it did!