Move index creation to its own migration

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/Migrations/20260522092303_AddNormalizedUsername.Designer.cs

@@ -1356,9 +1356,6 @@ namespace Jellyfin.Server.Implementations.Migrations
                     b.HasIndex("Username")
                         .IsUnique();
 
-                    b.HasIndex("NormalizedUsername")
-                        .IsUnique();
-
                     b.ToTable("Users");
 
                     b.HasAnnotation("Sqlite:UseSqlReturningClause", false);

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/Migrations/20260522092303_AddNormalizedUsername.cs

@@ -18,12 +18,6 @@ namespace Jellyfin.Server.Implementations.Migrations
                 maxLength: 255,
                 nullable: false,
                 defaultValue: string.Empty);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_Users_NormalizedUsername",
-                table: "Users",
-                column: "NormalizedUsername",
-                unique: true);
         }
 
         /// <inheritdoc />
@@ -32,10 +26,6 @@ namespace Jellyfin.Server.Implementations.Migrations
             migrationBuilder.DropColumn(
                 name: "NormalizedUsername",
                 table: "Users");
-
-            migrationBuilder.DropIndex(
-                name: "IX_Users_NormalizedUsername",
-                table: "Users");
         }
     }
 }

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/Migrations/20260524120336_AddUniqueNormalizedUsernameIndex.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Jellyfin.Server.Implementations.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddUniqueNormalizedUsernameIndex : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex(
+                name: "IX_Users_NormalizedUsername",
+                table: "Users",
+                column: "NormalizedUsername",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Users_NormalizedUsername",
+                table: "Users");
+        }
+    }
+}