refactor: update models — add CutTemplate.Revision, remove ExportRecord, simplify ExportContext

- CutTemplate: add Revision property, remove EF Core navigation properties
- BomItem: remove EF Core navigation properties and ExportRecordId
- ExportContext: replace Equipment/DrawingNo/Title/FilePrefix with
  FilenameTemplate and OutputFolder
- Delete ExportRecord.cs (replaced by log file)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ExportDXF/Models/BomItem.cs

@@ -2,7 +2,6 @@ namespace ExportDXF.Models
 {
     public class BomItem
     {
-        public int ID { get; set; }
         public string ItemNo { get; set; } = "";
         public string PartNo { get; set; } = "";
         public int SortOrder { get; set; }
@@ -12,13 +11,7 @@ namespace ExportDXF.Models
         public string PartName { get; set; } = "";
         public string ConfigurationName { get; set; } = "";
         public string Material { get; set; } = "";
-
-        // EF Core relationship to ExportRecord
-        public int ExportRecordId { get; set; }
-        public virtual ExportRecord ExportRecord { get; set; }
-
-        // Optional 1:1 relationship to CutTemplate (only for sheet metal parts)
-        public virtual CutTemplate CutTemplate { get; set; }
+        public CutTemplate CutTemplate { get; set; }
     }
 
     public struct Size

ExportDXF/Models/CutTemplate.cs

@@ -4,12 +4,11 @@ namespace ExportDXF.Models
 {
     public class CutTemplate
     {
-        public int Id { get; set; }
         public string DxfFilePath { get; set; } = "";
         public string ContentHash { get; set; }
         public string CutTemplateName { get; set; } = "";
+        public int Revision { get; set; } = 1;
 
-        // Sheet metal properties (moved from BomItem)
         private double? _thickness;
         public double? Thickness
         {
@@ -25,9 +24,5 @@ namespace ExportDXF.Models
             get => _defaultBendRadius;
             set => _defaultBendRadius = value.HasValue ? Math.Round(value.Value, 8) : null;
         }
-
-        // FK back to BomItem
-        public int BomItemId { get; set; }
-        public virtual BomItem BomItem { get; set; }
     }
 }

ExportDXF/Models/ExportContext.cs

@@ -1,4 +1,4 @@
-using ExportDXF.Models;
+using ExportDXF.Models;
 using ExportDXF.ViewFlipDeciders;
 using SolidWorks.Interop.sldworks;
 using SolidWorks.Interop.swconst;
@@ -28,29 +28,14 @@ namespace ExportDXF.Services
         public IViewFlipDecider ViewFlipDecider { get; set; }
 
         /// <summary>
-        /// Prefix to prepend to exported filenames.
+        /// Filename template with placeholders (e.g., "4321 A01 PT{item_no:2}").
         /// </summary>
-        public string FilePrefix { get; set; }
+        public string FilenameTemplate { get; set; }
 
         /// <summary>
-        /// Equipment number from the UI (e.g., "5028").
+        /// Output folder for DXF files and Excel workbook.
         /// </summary>
-        public string Equipment { get; set; }
-
-        /// <summary>
-        /// Drawing number from the UI (e.g., "A02", "Misc").
-        /// </summary>
-        public string DrawingNo { get; set; }
-
-        /// <summary>
-        /// Optional title/label for the export.
-        /// </summary>
-        public string Title { get; set; }
-
-        /// <summary>
-        /// Selected Equipment ID for API operations (optional).
-        /// </summary>
-        public int? EquipmentId { get; set; }
+        public string OutputFolder { get; set; }
 
         /// <summary>
         /// Cancellation token for canceling the export operation.
@@ -82,8 +67,8 @@ namespace ExportDXF.Services
             get
             {
                 return Path.Combine(
-                    Application.StartupPath, 
-                    DRAWING_TEMPLATE_FOLDER, 
+                    Application.StartupPath,
+                    DRAWING_TEMPLATE_FOLDER,
                     DRAWING_TEMPLATE_FILE);
             }
         }
@@ -123,23 +108,17 @@ namespace ExportDXF.Services
 
                     if (!string.IsNullOrEmpty(title))
                     {
-                        // Close the document without saving
                         SolidWorksApp.CloseDoc(title);
                         ProgressCallback?.Invoke("Closed template drawing", LogLevel.Info, null);
                     }
                 }
 
-                // Clear the reference regardless of success/failure
                 TemplateDrawing = null;
             }
             catch (Exception ex)
             {
                 ProgressCallback?.Invoke($"Failed to close template drawing: {ex.Message}", LogLevel.Error, null);
-
-                // Still clear the reference to prevent further issues
                 TemplateDrawing = null;
-
-                // Don't throw here as this is cleanup code - log the error but continue
             }
         }
 

ExportDXF/Models/ExportRecord.cs

@@ -1,20 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace ExportDXF.Models
-{
-    public class ExportRecord
-    {
-        public int Id { get; set; }
-        public string DrawingNumber { get; set; }
-        public string EquipmentNo { get; set; }
-        public string DrawingNo { get; set; }
-        public string SourceFilePath { get; set; }
-        public string OutputFolder { get; set; }
-        public DateTime ExportedAt { get; set; }
-        public string ExportedBy { get; set; }
-        public string PdfContentHash { get; set; }
-
-        public virtual ICollection<BomItem> BomItems { get; set; } = new List<BomItem>();
-    }
-}