feat: add configurable threshold for balance delta notification (#3433)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

lnbits/core/services/funding_source.py

@@ -70,7 +70,8 @@ async def check_balance_delta_changed():
     if settings.latest_balance_delta_sats is None:
         settings.latest_balance_delta_sats = status.delta_sats
         return
-    if status.delta_sats != settings.latest_balance_delta_sats:
+    delta_change = abs(status.delta_sats - settings.latest_balance_delta_sats)
+    if delta_change >= settings.notification_balance_delta_threshold_sats:
         enqueue_admin_notification(
             NotificationType.balance_delta,
             {

lnbits/core/services/notifications.py

@@ -392,7 +392,7 @@ def _is_message_type_enabled(message_type: NotificationType) -> bool:
     if message_type == NotificationType.watchdog_check:
         return settings.lnbits_notification_watchdog
     if message_type == NotificationType.balance_delta:
-        return settings.notification_balance_delta_changed
+        return settings.notification_balance_delta_threshold_sats > 0
     if message_type == NotificationType.server_start_stop:
         return settings.lnbits_notification_server_start_stop
     if message_type == NotificationType.server_status:

lnbits/core/tasks.py

@@ -35,7 +35,7 @@ async def run_by_the_minute_tasks() -> None:
     while settings.lnbits_running:
         status_minutes = settings.lnbits_notification_server_status_hours * 60
 
-        if settings.notification_balance_delta_changed:
+        if settings.notification_balance_delta_threshold_sats > 0:
             try:
                 # runs by default every minute, the delta should not change that often
                 await check_balance_delta_changed()