Initial commit: JDE Scoping Tool migration project

Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.

OLD/WorkerService/Models/LastDataUpdate.cs

@@ -0,0 +1,30 @@
+using System;
+
+namespace WorkerService.Models
+{
+    /// <summary>
+    /// Set of last successful data updates for table
+    /// </summary>
+    public class LastDataUpdate
+    {
+        /// <summary>
+        /// Data table name
+        /// </summary>
+        public string TableName { get; set; }
+
+        /// <summary>
+        /// Timestamp of last successful mass data update
+        /// </summary>
+        public DateTime MassUpdateDT { get; set; }
+
+        /// <summary>
+        /// Timestamp of last successful daily data update
+        /// </summary>
+        public DateTime DailyUpdateDT { get; set; }
+
+        /// <summary>
+        /// Timestamp of last successful hourly data update
+        /// </summary>
+        public DateTime HourlyUpdateDT { get; set; }
+    }
+}