Add Webhooks in store's settings

BTCPayServer.Data/Data/StoreWebhookData.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.EntityFrameworkCore;
+using System.Linq;
+
+namespace BTCPayServer.Data
+{
+    public class StoreWebhookData
+    {
+        public string StoreId { get; set; }
+        public string WebhookId { get; set; }
+        public WebhookData Webhook { get; set; }
+        public StoreData Store { get; set; }
+
+        internal static void OnModelCreating(ModelBuilder builder)
+        {
+            builder.Entity<StoreWebhookData>()
+                .HasKey(p => new { p.StoreId, p.WebhookId });
+
+            builder.Entity<StoreWebhookData>()
+                .HasOne(o => o.Webhook)
+                .WithOne().OnDelete(DeleteBehavior.Cascade);
+
+            builder.Entity<StoreWebhookData>()
+                .HasOne(o => o.Store)
+                .WithOne().OnDelete(DeleteBehavior.Cascade);
+        }
+    }
+}