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When I design my first product 10 years ago. The transaction table is CR only ,too .
Problems with centralized IT infrastructure include the fact that in a centralised IT infrastructure the normal databases have CRUD, meaning Create Read Update Delete. There is always a super user who can do all of those operations.
In Blockchain you have transparency and integrity because in Block chain the only functions you have are Create and Read, which means that you can only add things which is why we say that Blockchain is an append only system.
You can only add things to the ledger and you can read things from the ledger, you remove or delete things, you cannot update existing records, you can only add new records.
On Blockchain there is append only functionalities.