diff --git a/src/Meezi.API/Services/DemoSeedService.cs b/src/Meezi.API/Services/DemoSeedService.cs
index 60e875d..a7c0de9 100644
--- a/src/Meezi.API/Services/DemoSeedService.cs
+++ b/src/Meezi.API/Services/DemoSeedService.cs
@@ -130,7 +130,10 @@ public class DemoSeedService : IDemoSeedService
         decimal qty, decimal reorder, decimal cost, decimal par) =>
         new()
         {
-            Id = $"{cafeId}_ing_{Guid.NewGuid():N}"[..36],
+            // No [..36] truncation: Id is a text column, and truncating to 36 chars
+            // cuts off the unique guid for real (32-char) café ids → every row gets
+            // the same id → PK collision → 500. Keep the full unique id.
+            Id = $"{cafeId}_ing_{Guid.NewGuid():N}",
             CafeId = cafeId,
             Name = name,
             Unit = unit,
@@ -160,7 +163,9 @@ public class DemoSeedService : IDemoSeedService
         string cafeId, string branchId, string number, int capacity, string floor, int sortOrder) =>
         new()
         {
-            Id = $"{cafeId}_tbl_{Guid.NewGuid():N}"[..36],
+            // No [..36] truncation (see Ingredient above): truncating cuts the guid
+            // for real 32-char café ids → identical ids → PK collision → 500.
+            Id = $"{cafeId}_tbl_{Guid.NewGuid():N}",
             CafeId = cafeId,
             BranchId = branchId,
             Number = number,