Update predict_from_supabase.py

predict_from_supabase.py

@@ -5,7 +5,7 @@ Supabase and return the PPO-recommended replacement schedule.
 
 import os
 import numpy as np
-from datetime import datetime
+from datetime import datetime, timezone
 from supabase import create_client
 from stable_baselines3 import PPO
 from model import DegradationModel
@@ -64,7 +64,7 @@ def _fetch_health(printer_id: str, t: datetime) -> np.ndarray:
     if not printer:
         raise ValueError(f"Printer {printer_id} not found")
 
-    last_repair = datetime.fromisoformat(printer["last_repair"])
+    last_repair = datetime.fromisoformat(printer["last_repair"]).replace(tzinfo=timezone.utc)
     time_step_id = int((t - last_repair).total_seconds() // 3600)
 
     row = (