Understanding GATT database

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Hello,

I am trying to understand the difference between the gatt_db stored in
the device structure and the one stored in bt_gatt_client structure. I
see that the database stored in the device is recovered from the
cache. I would like to understand what it is used for if anyway the
new one is created during the discover_services phase? Another
question that would very probably help me to understand this better:
if I copy the device->db to client->db, would it still work or we
really need to pass by a communication with a BLE device and compose
the database from scratch?

Could anybody explain me this please?

Thanks a lot for your time,
Best regards,
Natalya
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