Cap requests and shorter sessions

app.py

@@ -23,9 +23,9 @@ SAMPLE_RATE = 16_000
 WARMUP_DURATION = 2.0  # seconds of silence for warmup
 WPM_WINDOW = 10  # seconds for running mean calculation
 CALIBRATION_PERIOD = 5  # seconds before showing WPM
-SESSION_TIMEOUT = int(os.environ.get("SESSION_TIMEOUT", "60"))
-INACTIVITY_TIMEOUT = int(os.environ.get("INACTIVITY_TIMEOUT", "20"))
-MAX_CONCURRENT_SESSIONS = int(os.environ.get("MAX_SESSIONS", "200"))
+SESSION_TIMEOUT = int(os.environ.get("SESSION_TIMEOUT", "30"))      # Max 30s per session
+INACTIVITY_TIMEOUT = int(os.environ.get("INACTIVITY_TIMEOUT", "10"))  # Close after 10s silence
+MAX_CONCURRENT_SESSIONS = int(os.environ.get("MAX_SESSIONS", "40"))
 
 # Global config (shared across users)
 ws_url = ""