pub trait DatabaseGuard {
// Required methods
fn get(&self, hash: H256) -> Option<Vec<u8>>;
fn set(&mut self, hash: H256, value: Vec<u8>);
}pub trait DatabaseGuard {
// Required methods
fn get(&self, hash: H256) -> Option<Vec<u8>>;
fn set(&mut self, hash: H256, value: Vec<u8>);
}