pub trait StoreProxyInterface: Send + Sync {
type WriteItemResponseFut: Future<Output = Result<StoreWriteItemResult, Error>> + Send;
type ReadItemResponseFut: Future<Output = Result<StoreReadItemResult, Error>> + Send;
// Required methods
fn write_item(&self, attempt: &Item) -> Self::WriteItemResponseFut;
fn read_item(&self, key: &str) -> Self::ReadItemResponseFut;
}