API can serve bidding_of_highest_round and biddings_of_round/:round_number route.

lib/beet_round_server/biddings.ex

@@ -66,6 +66,26 @@ defmodule BeetRoundServer.Biddings do
     Repo.get_by!(Bidding, id: id, user_id: scope.user.id)
   end
 
+  def biddings_of_round(round_number) do
+    Repo.all(
+      from(bidding in Bidding,
+        where: bidding.bidding_round == ^round_number,
+        order_by: [asc: bidding.inserted_at]
+      )
+    )
+  end
+
+  def get_most_recent_bidding(%Scope{} = scope) do
+    query =
+      Ecto.Query.from(bidding in Bidding,
+        where: bidding.user_id == ^scope.user.id,
+        order_by: [desc: bidding.inserted_at],
+        limit: 1
+      )
+
+    Repo.one(query)
+  end
+
   @doc """
   Creates a bidding.