diff --git a/app/core/_config.py b/app/core/_config.py
index 03cac9f..f7e3fc5 100644
--- a/app/core/_config.py
+++ b/app/core/_config.py
@@ -21,8 +21,28 @@ assert TELEGRAM_API_KEY, "Telegram API_KEY required"
 CLIENT_TELEGRAM_API_KEY = os.environ.get('CLIENT_TELEGRAM_API_KEY')
 assert CLIENT_TELEGRAM_API_KEY, "Client Telegram API_KEY required"
 import httpx
-TELEGRAM_BOT_USERNAME = httpx.get(f"https://api.telegram.org/bot{TELEGRAM_API_KEY}/getMe").json()['result']['username']
-CLIENT_TELEGRAM_BOT_USERNAME = httpx.get(f"https://api.telegram.org/bot{CLIENT_TELEGRAM_API_KEY}/getMe").json()['result']['username']
+
+
+def _resolve_bot_username(token: str, label: str) -> str:
+    try:
+        resp = httpx.get(f"https://api.telegram.org/bot{token}/getMe", timeout=10.0)
+        resp.raise_for_status()
+        payload = resp.json()
+    except Exception as exc:
+        raise RuntimeError(f"{label} Telegram token validation failed: {exc}") from exc
+
+    if not payload.get('ok'):
+        detail = payload.get('description') or 'unknown Telegram API error'
+        raise RuntimeError(f"{label} Telegram token validation failed: {detail}")
+
+    username = (payload.get('result') or {}).get('username')
+    if not username:
+        raise RuntimeError(f"{label} Telegram token validation failed: username missing in Telegram response")
+    return username
+
+
+TELEGRAM_BOT_USERNAME = _resolve_bot_username(TELEGRAM_API_KEY, 'Uploader bot')
+CLIENT_TELEGRAM_BOT_USERNAME = _resolve_bot_username(CLIENT_TELEGRAM_API_KEY, 'Client bot')
 
 # Unified database URL (PostgreSQL)
 DATABASE_URL = os.environ['DATABASE_URL']