Keep bot operational when forecast model is unavailable

.env.example

@@ -72,6 +72,9 @@ TIME_SERIES_PROBE_MIN_EDGE_PERCENT=0.02
 TIME_SERIES_PROBE_MIN_PROBABILITY_UP=0.55
 TIME_SERIES_PROBE_SIZE_MULTIPLIER=0.40
 TIME_SERIES_REBOUND_FALLBACK_ENABLED=false
+# Use the independently guarded trend/MACD strategy while no accepted fresh
+# Torch model is available. The rejected model is never used for entries.
+TIME_SERIES_TREND_FALLBACK_ENABLED=true
 TIME_SERIES_REQUIRE_QUALITY_GATE=true
 # Emergency paper-only override. Keep false unless a failed guard is accepted manually.
 TIME_SERIES_MANUAL_QUALITY_OVERRIDE=false
@@ -107,7 +110,7 @@ STORAGE_RETENTION_DAYS=30
 STORAGE_PRUNE_INTERVAL_SECONDS=3600
 
 # Windows trainer keeps this final tail untouched by training and early stopping.
-TORCH_RETRAIN_HOLDOUT_WINDOW=240
+TORCH_RETRAIN_HOLDOUT_WINDOW=1000
 
 DATABASE_PATH=runtime/tradebot.sqlite3
 LOG_PATH=runtime/tradebot.log