Update app.py

app.py

@@ -84,9 +84,25 @@ app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024  # 16MB max
 # # --- CONFIGURE SERVER-SIDE SESSIONS ---
 app.config["SESSION_PERMANENT"] = False
 app.config["SESSION_TYPE"] = "filesystem"
-app.config["SESSION_FILE_DIR"] = "/app/flask_session" # <-- 2. UNCOMMENT THIS
+app.config["SESSION_FILE_DIR"] = "/tmp/flask_session"  # <-- 1. CHANGED PATH
 Session(app)
 
+# --- START OF NEW DEBUG BLOCK ---
+SESSION_DIR = app.config["SESSION_FILE_DIR"]
+logger.info(f"--- SESSION DEBUG ---")
+logger.info(f"SESSION_DIR set to: {SESSION_DIR}")
+try:
+    # Attempt to create the dir from within Python, just in case
+    os.makedirs(SESSION_DIR, exist_ok=True) 
+    
+    if os.access(SESSION_DIR, os.W_OK):
+        logger.info(f"✅ SUCCESS: Session directory {SESSION_DIR} is WRITABLE.")
+    else:
+        logger.error(f"❌ FAILED: Session directory {SESSION_DIR} is NOT WRITABLE.")
+except Exception as e:
+    logger.error(f"❌ FAILED: Error checking/creating session directory {SESSION_DIR}: {e}")
+logger.info(f"--- END SESSION DEBUG ---")
+
 google_api_key = os.getenv("GOOGLE_API_KEY")
 if not google_api_key:
     logger.warning("⚠️ GOOGLE_API_KEY not found in environment variables. LLM calls will fail.")