Give high level description of a database/blockchain combination (hybrid) and its benefit for edge devices, for example BigchainDB and MongoDB, or as shown below

MIDDLEWARE Apply Query Send Data USER BLOCKCHAIN NETWORK Save Data Figure 1. Hybrid Database Design As shown in Figure 1, users can do all transactions except data storage through central database. This model combines the security of Blokchains with the speed and flexibility of the central database. It will make it easier to manage and control the established Blockchain network. In addition, the Blockchain network cannot be occupied outside the data logging process and will perform its operations with maximum efficiency. Hyperledger Fabric and Hyperledger Cello are used for the Blockchain Network in the design of Figure 1. MongoDB preferred as the central database