Add metering devices page

Hcs.WebApp/Services/MeteringDeviceService.cs

@@ -0,0 +1,30 @@
+using EFCore.BulkExtensions;
+using Hcs.WebApp.Data.Hcs;
+using Microsoft.EntityFrameworkCore;
+
+namespace Hcs.WebApp.Services
+{
+    public class MeteringDeviceService(IDbContextFactory<HcsDbContext> factory) : HcsServiceBase(factory)
+    {
+        public async Task<IEnumerable<MeteringDevice>> GetAllMeteringDevicesAsync()
+        {
+            using var context = GetNewContext();
+            return await context.MeteringDevices.ToListAsync();
+        }
+
+        public async Task UpsertMeteringDevices(HcsDbContext context, IEnumerable<MeteringDevice> meteringDevices)
+        {
+            await context.BulkInsertOrUpdateAsync(meteringDevices, new BulkConfig()
+            {
+                PropertiesToExcludeOnUpdate =
+                [
+                    nameof(MeteringDevice.ThirdPartyId)
+                ],
+                UpdateByProperties =
+                [
+                    nameof(MeteringDevice.HcsId)
+                ]
+            });
+        }
+    }
+}