Add option to keep models only in memory for backtest

config_examples/config_freqai.example.json

@@ -56,6 +56,7 @@
         "purge_old_models": true,
         "train_period_days": 15,
         "backtest_period_days": 7,
+        "backtest_save_model": true,
         "live_retrain_hours": 0,
         "identifier": "uniqe-id",
         "feature_parameters": {
@@ -94,4 +95,4 @@
     "internals": {
         "process_throttle_secs": 5
     }
-}
+}