Hardcode agent stale timeout

app/services/status_service.py

@@ -10,6 +10,7 @@ import sqlite3
 from datetime import datetime, timezone
 from typing import Optional
 
+from app.config import AGENT_STALE_AFTER_SECONDS
 from app.database import get_conn, get_write_conn
 
 logger = logging.getLogger(__name__)
@@ -55,25 +56,15 @@ def get_latest_agent_activity() -> Optional[sqlite3.Row]:
         ).fetchone()
 
 
-def get_agent_stale_seconds() -> int:
-    """Read agent_stale_after_seconds from settings table."""
-    with get_conn() as conn:
-        row = conn.execute(
-            "SELECT value FROM settings WHERE key = 'agent_stale_after_seconds'"
-        ).fetchone()
-    return int(row["value"]) if row else 30
-
-
 def is_agent_connected() -> bool:
     """True if the most recent agent activity is within the stale threshold."""
     row = get_latest_agent_activity()
     if row is None:
         return False
-    stale_seconds = get_agent_stale_seconds()
     last_seen = datetime.fromisoformat(row["last_seen_at"])
     now = datetime.now(timezone.utc)
     if last_seen.tzinfo is None:
         last_seen = last_seen.replace(tzinfo=timezone.utc)
     delta = (now - last_seen).total_seconds()
-    return delta <= stale_seconds
+    return delta <= AGENT_STALE_AFTER_SECONDS