Methodology:

For staking metrics, tracks and aggregates bond, request_unbond and withdraw_unbond events with wasm message type wasm-silohub/bonded from sei.core.fact_msgs

For staking exchange rate: tracksexchange_rate event from sei1e3gttzq5e5k49f9f5gzvrl0rltlav65xu6p9xc0aj7e84lantdjqp7cncc contract