[WIP] Use compiled queries

Tests/UnitTests/DocumentTests/DeliveryConfirmationTest.cs

@@ -9,7 +9,7 @@ namespace Tests.UnitTests.DocumentTests {
         [Test]
         public async Task Test_01_SimpleDeliveryConfirmation() {
             using var ctx = new AppDbContext();
-            var m = await ctx.Members.FindAsync(101);
+            var m = await ctx.FetchMembers(101).SingleAsync();
             var data = await DeliveryConfirmationDeliveryData.ForMember(ctx.DeliveryParts, 2020, m!);
             using var doc = new DeliveryConfirmation(2020, m!, data);
             var text = await Utils.GeneratePdfText(doc);

Tests/UnitTests/DocumentTests/LetterheadTest.cs

@@ -8,7 +8,7 @@ namespace Tests.UnitTests.DocumentTests {
         [Test]
         public async Task Test_01_SimpleLetterhead() {
             using var ctx = new AppDbContext();
-            var m = await ctx.Members.FindAsync(104);
+            var m = await ctx.FetchMembers(104).SingleAsync();
             using var doc = new Letterhead(m!);
             var text = await Utils.GeneratePdfText(doc);
             Assert.Multiple(() => {