if let Some(epoch_config) = epoch_config.clone() {
    validate_epoch_duration(epoch_config.duration)?;
    config.epoch_config = epoch_config;  // Entire config replaced without genesis validation
    CONFIG.save(deps.storage, &config)?;
}
ensure!(
    msg.epoch_config.genesis_epoch.u64() >= env.block.time.seconds(),
    ContractError::InvalidStartTime
);
### Main invariants

Main invariants:

- Genesis epoch and epoch duration, not intended to changed once set up.
