Hardcode Python default empty response

app/database.py

@@ -12,6 +12,8 @@ import threading
 from contextlib import contextmanager
 from typing import Generator
 
+from app.config import DEFAULT_EMPTY_RESPONSE
+
 logger = logging.getLogger(__name__)
 
 # Module-level lock for write serialisation (consume atomicity, settings writes, etc.)
@@ -102,7 +104,7 @@ CREATE TABLE IF NOT EXISTS agent_activity (
 
 _DEFAULT_SETTINGS = {
     "default_wait_seconds": "10",
-    "default_empty_response": "",
+    "default_empty_response": DEFAULT_EMPTY_RESPONSE,
     "agent_stale_after_seconds": "30",
 }
 
@@ -119,6 +121,10 @@ def _seed_defaults(conn: sqlite3.Connection) -> None:
             "INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)",
             (key, value),
         )
+    conn.execute(
+        "UPDATE settings SET value = ? WHERE key = 'default_empty_response' AND value = ''",
+        (_DEFAULT_SETTINGS["default_empty_response"],),
+    )
     conn.commit()
     logger.debug("Default settings seeded")