Store when barcode was last scanned

Groceries.Data/AppDbContext.cs

@@ -33,6 +33,9 @@ public class AppDbContext : DbContext
 
             entity.Property(e => e.Format)
                 .HasDefaultValueSql();
+
+            entity.Property(e => e.LastScannedAt)
+                .HasDefaultValueSql();
         });
 
         modelBuilder.Entity<ItemPurchase>(entity =>

Groceries.Data/Items/ItemBarcode.cs

@@ -12,4 +12,5 @@ public class ItemBarcode
     public Guid ItemId { get; init; }
     public long BarcodeData { get; init; }
     public string Format { get; init; }
+    public DateTime LastScannedAt { get; set; }
 }

Groceries.Data/Migrations/20241005180119_item_barcodes_last_scanned_at.sql

@@ -0,0 +1,7 @@
+ALTER TABLE item_barcodes
+ADD COLUMN IF NOT EXISTS last_scanned_at timestamptz NOT NULL DEFAULT current_timestamp;
+
+UPDATE item_barcodes
+SET last_scanned_at = created_at
+FROM item_purchases
+WHERE item_barcodes.item_id = item_purchases.item_id AND is_last_purchase = true;

Groceries/Transactions/TransactionsController.cs

@@ -76,7 +76,16 @@ public class TransactionsController : Controller
                 .FirstOrDefaultAsync();
 
             item ??= new Item(id: default);
-            item.Barcodes.Add(new ItemBarcode(item.Id, barcodeData.Value, barcodeFormat));
+
+            var barcode = new ItemBarcode(item.Id, barcodeData.Value, barcodeFormat);
+            item.Barcodes.Add(barcode);
+
+            if (item.Id != default)
+            {
+                barcode.LastScannedAt = DateTime.UtcNow;
+                dbContext.Update(barcode);
+                await dbContext.SaveChangesAsync();
+            }
 
             // TODO: Fix `MinValue` hack - view models?
             transactionItem = new TransactionItem(item.Id, decimal.MinValue, int.MinValue) { Item = item };