fix messages, save tonPerStar rate

app/core/models/__init__.py

@@ -8,6 +8,6 @@ from app.core.models.wallet_connection import WalletConnection
 from app.core.models.messages import KnownTelegramMessage
 from app.core.models.user_activity import UserActivity
 from app.core.models.content.user_content import UserContent, UserAction
-from app.core.models._config import ServiceConfigValue
+from app.core.models._config import ServiceConfigValue, ServiceConfig
 from app.core.models.asset import Asset
 from app.core.models.my_network import KnownNode, KnownNodeIncident, RemoteContentIndex