Add env var to manage price chart cache frequency update

apps/explorer/config/config.exs

@@ -116,6 +116,16 @@ config :spandex_ecto, SpandexEcto.EctoLogger,
   tracer: Explorer.Tracer,
   otp_app: :explorer
 
+market_history_cache_ttl =
+  try do
+    String.to_integer(System.get_env("MARKET_HISTORY_CACHE_TTL"))
+  rescue
+    # 6 hours
+    _ -> 60 * 60 * 6
+  end
+
+config :explorer, Explorer.Market.MarketHistoryCache, ttl: :timer.seconds(market_history_cache_ttl)
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{Mix.env()}.exs"

apps/explorer/lib/explorer/market/market_history_cache.ex

@@ -12,7 +12,7 @@ defmodule Explorer.Market.MarketHistoryCache do
   @last_update_key :last_update
   @history_key :history
   # 6 hours
-  @cache_period 1_000 * 60 * 60 * 6
+  @cache_period Application.get_env(:explorer, __MODULE__)[:ttl]
   @recent_days 30
 
   def fetch do