fix: some compilation warnings about unused stuff

lib/supavisor.ex

@@ -3,8 +3,6 @@ defmodule Supavisor do
 
   require Logger
 
-  import Cachex.Spec
-
   alias Supavisor.{
     Helpers,
     Manager,

lib/supavisor/application.ex

@@ -7,7 +7,6 @@ defmodule Supavisor.Application do
 
   require Logger
 
-  alias Supavisor.Handlers.Proxy.Handler, as: ProxyHandler
   alias Supavisor.Monitoring.PromEx
 
   @metrics_disabled Application.compile_env(:supavisor, :metrics_disabled, false)

lib/supavisor/client_handler.ex

@@ -617,7 +617,10 @@ defmodule Supavisor.ClientHandler do
         {:next_state, :idle, %{data | db_pid: db_pid, stats: stats}, handle_actions(data)}
 
       :read_sql_error ->
-        Logger.error("ClientHandler: read only sql transaction, reruning the query to write pool")
+        Logger.error(
+          "ClientHandler: read only sql transaction, rerunning the query to write pool"
+        )
+
         # release the read pool
         _ = handle_db_pid(data.mode, data.pool, data.db_pid)
 
@@ -991,34 +994,6 @@ defmodule Supavisor.ClientHandler do
     end
   end
 
-  @spec handle_prepared_statements({pid, pid}, binary, map) :: :ok | nil
-  defp handle_prepared_statements({_, pid}, bin, %{mode: :transaction} = data) do
-    with {:ok, payload} <- Client.get_payload(bin),
-         {:ok, statements} <- Supavisor.PgParser.statements(payload),
-         true <- statements in [["PrepareStmt"], ["DeallocateStmt"]] do
-      Logger.info("ClientHandler: Handle prepared statement #{inspect(payload)}")
-
-      GenServer.call(data.pool, :get_all_workers)
-      |> Enum.each(fn
-        {_, ^pid, _, [Supavisor.DbHandler]} ->
-          Logger.debug("ClientHandler: Linked DbHandler #{inspect(pid)}")
-          nil
-
-        {_, pool_proc, _, [Supavisor.DbHandler]} ->
-          Logger.debug(
-            "ClientHandler: Sending prepared statement change #{inspect(payload)} to #{inspect(pool_proc)}"
-          )
-
-          send(pool_proc, {:handle_ps, payload, bin})
-      end)
-    else
-      error ->
-        Logger.debug("ClientHandler: Skip prepared statement #{inspect(error)}")
-    end
-  end
-
-  defp handle_prepared_statements(_, _, _), do: nil
-
   @spec handle_actions(map) :: [{:timeout, non_neg_integer, atom}]
   defp handle_actions(%{} = data) do
     heartbeat =