diff --git a/packages/backend-core/src/sql/sqlTable.ts b/packages/backend-core/src/sql/sqlTable.ts
index 8e15d3d4ef..0bdf77edbb 100644
--- a/packages/backend-core/src/sql/sqlTable.ts
+++ b/packages/backend-core/src/sql/sqlTable.ts
@@ -141,14 +141,18 @@ function generateSchema(
             .references(`${tableName}.${relatedPrimary}`)
         }
         break
+      case FieldType.ATTACHMENTS:
+      case FieldType.ATTACHMENT_SINGLE:
+        // single attachments are stored as an object, multi attachments
+        // are stored as an array
+        schema.json(key)
+        break
       case FieldType.FORMULA:
         // This is allowed, but nothing to do on the external datasource
         break
       case FieldType.AI:
         // This is allowed, but nothing to do on the external datasource
         break
-      case FieldType.ATTACHMENTS:
-      case FieldType.ATTACHMENT_SINGLE:
       case FieldType.SIGNATURE_SINGLE:
       case FieldType.AUTO:
       case FieldType.JSON: