This ticket aims to add a validation step to ensure that when a router sends a command attaching a dbVersion, and a shard accepts the request because both database versions match – the dbVersion in the DSS and the dbVersion received in the command from the router – the primary field in the DSS matches the shard processing the request.

This check will give us more guarantees that if we have a bug on the router side, which incorrectly targets a non-db primary shard by attaching the database version of another shard, that shard will not accept the request, thus preventing potential data loss.