add an index to PoemNarrations table

RMuseum/DbContext/RMuseumDbContext.cs

@@ -74,6 +74,9 @@ namespace RMuseum.DbContext
             builder.Entity<PoemNarration>()
                 .HasIndex(p => p.GanjoorPostId);
 
+            builder.Entity<PoemNarration>()
+               .HasIndex(p => p.UploadDate);
+
             builder.Entity<GanjoorCat>()
                 .HasIndex(c => c.FullUrl);
 

RMuseum/Migrations/20201106113129_PoemNarrationUploadDateIndex.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace RMuseum.Migrations
+{
+    public partial class PoemNarrationUploadDateIndex : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex(
+                name: "IX_AudioFiles_UploadDate",
+                table: "AudioFiles",
+                column: "UploadDate");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_AudioFiles_UploadDate",
+                table: "AudioFiles");
+        }
+    }
+}

RMuseum/Migrations/RMuseumDbContextModelSnapshot.cs

@@ -525,6 +525,8 @@ namespace RMuseum.Migrations
 
                     b.HasIndex("ReviewerId");
 
+                    b.HasIndex("UploadDate");
+
                     b.ToTable("AudioFiles");
                 });