Add Echobell provider

prisma/migrations/20250429204709_echobell_fix/migration.sql

@@ -0,0 +1,8 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `echobellData` on the `notification` table. All the data in the column will be lost.
+
+*/
+-- AlterTable
+ALTER TABLE "notification" DROP COLUMN "echobellData";

prisma/schema.prisma

@@ -105,7 +105,6 @@ model notification {
   pushoverToken String?
   pushoverUser  String?
   echobellURL   String?
-  echobellData  String?
 }
 
 model test_notification {