improve Frontend

src/ClaudeDo.Data/Migrations/20260422120000_AddTaskSortOrder.cs

@@ -0,0 +1,48 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTaskSortOrder : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "sort_order",
+                table: "tasks",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+
+            // Backfill existing rows with a per-list dense order (0..N-1) by creation time
+            // so today's UI order is preserved after the migration.
+            migrationBuilder.Sql("""
+                WITH ordered AS (
+                    SELECT id, (row_number() OVER (PARTITION BY list_id ORDER BY created_at) - 1) AS rn
+                    FROM tasks
+                )
+                UPDATE tasks SET sort_order = (SELECT rn FROM ordered WHERE ordered.id = tasks.id);
+                """);
+
+            migrationBuilder.CreateIndex(
+                name: "idx_tasks_list_sort",
+                table: "tasks",
+                columns: new[] { "list_id", "sort_order" });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "idx_tasks_list_sort",
+                table: "tasks");
+
+            migrationBuilder.DropColumn(
+                name: "sort_order",
+                table: "tasks");
+        }
+    }
+}