start cache in repo process

apps/explorer/lib/explorer/application.ex

@@ -12,7 +12,6 @@ defmodule Explorer.Application do
   @impl Application
   def start(_type, _args) do
     PrometheusLogger.setup()
-    BlockNumberCache.setup()
 
     :telemetry.attach(
       "prometheus-ecto",
@@ -35,7 +34,11 @@ defmodule Explorer.Application do
 
     opts = [strategy: :one_for_one, name: Explorer.Supervisor]
 
-    Supervisor.start_link(children, opts)
+    res = Supervisor.start_link(children, opts)
+
+    BlockNumberCache.setup()
+
+    res
   end
 
   defp configurable_children do

apps/explorer/lib/explorer/chain/block_number_cache.ex

@@ -1,4 +1,8 @@
 defmodule Explorer.Chain.BlockNumberCache do
+  @moduledoc """
+  Cache for max and min block numbers.
+  """
+
   alias Explorer.Chain
 
   @tab :block_number_cache

apps/explorer/test/explorer/chain/block_number_cache_test.exs

@@ -1,4 +1,4 @@
-defmodule Explorer.ChainTest do
+defmodule Explorer.Chain.BlockNumberCacheTest do
   use Explorer.DataCase
 
   alias Explorer.Chain.BlockNumberCache