Added index for MetadataEntries on Key Include Value for joins

src/REstate.Engine.Repositories.EntityFrameworkCore/REstateDbContext.cs

@@ -85,6 +85,9 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                 .HasMaxLength(450)
                 .IsRequired();
 
+            modelBuilder.Entity<MetadataEntry>()
+                .HasIndex(entry => entry.Key);
+
             modelBuilder.Entity<StateBagEntry>()
                 .HasKey(entry => new
                 {

src/REstate.EntityFrameworkCore.Migrations.SqlServer/Migrations/20190111035035_IndexMetadataEntriesKey.cs

@@ -0,0 +1,33 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace REstate.EntityFrameworkCore.Migrations.SqlServer.Migrations
+{
+    public partial class IndexMetadataEntriesKey : Migration
+    {
+        private const string SqlServer = "Microsoft.EntityFrameworkCore.SqlServer";
+
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            if (migrationBuilder.ActiveProvider == SqlServer)
+            {
+                migrationBuilder.Sql(@"CREATE NONCLUSTERED INDEX IX_MetadataEntries_Key
+ON [dbo].[MetadataEntries] ([Key])
+INCLUDE ([Value])");
+            }
+            else
+            {
+                migrationBuilder.CreateIndex(
+                    name: "IX_MetadataEntries_Key",
+                    table: "MetadataEntries",
+                    column: "Key");
+            }
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_MetadataEntries_Key",
+                table: "MetadataEntries");
+        }
+    }
+}

src/REstate.EntityFrameworkCore.Migrations.SqlServer/Migrations/REstateDbContextModelSnapshot.cs

@@ -60,6 +60,8 @@ protected override void BuildModel(ModelBuilder modelBuilder)
 
                     b.HasKey("MachineId", "Key");
 
+                    b.HasIndex("Key");
+
                     b.ToTable("MetadataEntries");
                 });