Elias needed a scalpel, not a sledgehammer. He couldn't re-run the entire migration; it would take fourteen hours they didn't have. He pulled up his terminal and began to type. He needed a script—a specific tool that would scan every single entry in the new database, compare it against the source, and verify that the value matched the key exactly.
Walks every key without locking the database for too long. kv checker full
