Tai.Trading.OrderStore.Backends.ETS.find_by_client_id

You're seeing just the function find_by_client_id, go back to Tai.Trading.OrderStore.Backends.ETS module for more information.
Link to this function

find_by_client_id(client_id, table_name)

Specs

find_by_client_id(client_id(), table_name()) ::
  {:ok, order()} | {:error, :not_found}

Return the order from the ETS table that matches the given client_id