feat: persist browser sessions and update admin workflows

backend/app/services/webhook_service.py

@@ -15,6 +15,7 @@ from app.utils.dingtalk import (
     format_dingtalk_rate_changed,
     format_dingtalk_website_rate_changed,
     format_dingtalk_status,
+    format_dingtalk_balance_low,
 )
 
 
@@ -185,6 +186,43 @@ def send_status_event(
             _log(db, wh, event, generic_payload, "failed", str(exc))
 
 
+def send_balance_low(
+    db: Session,
+    upstream_id: int,
+    upstream_name: str,
+    base_url: str,
+    balance: float,
+    threshold: float,
+) -> None:
+    webhooks = (
+        db.query(WebhookConfig)
+        .filter(WebhookConfig.enabled == True)
+        .all()
+    )
+    event = "upstream_balance_low"
+    changed_at = _now_iso()
+    generic_payload = {
+        "event": event,
+        "upstream": {"id": upstream_id, "name": upstream_name, "base_url": base_url},
+        "balance": balance,
+        "threshold": threshold,
+        "changed_at": changed_at,
+    }
+    for wh in webhooks:
+        events = json.loads(wh.events_json or "[]")
+        if event not in events:
+            continue
+        try:
+            if wh.type == "dingtalk":
+                msg = format_dingtalk_balance_low(upstream_name, balance, threshold, changed_at)
+                resp_text = _send_dingtalk(wh.url, wh.secret, msg)
+            else:
+                resp_text = _send_generic(wh.url, generic_payload)
+            _log(db, wh, event, generic_payload, "success", resp_text)
+        except Exception as exc:
+            _log(db, wh, event, generic_payload, "failed", str(exc))
+
+
 def send_test_notification(db: Session, webhook: WebhookConfig) -> tuple[bool, str]:
     payload = {
         "event": "test",