fix: Fix all examples

heromodels/examples/calendar_rhai/calendar.rhai

@@ -1,8 +1,8 @@
 // Get the database instance
 let db = get_db();
 
-// Create a new calendar
-let calendar = calendar__builder(1);
+// Create a new calendar with auto-generated ID (pass 0 for auto-generated ID)
+let calendar = calendar__builder(0);
 calendar.name = "My First Calendar";
 set_description(calendar, "A calendar for testing Rhai integration");
 
@@ -26,8 +26,8 @@ if calendar_exists(db, 1) {
     print("Failed to retrieve calendar with ID 1");
 }
 
-// Create another calendar
-let calendar2 = calendar__builder(2);
+// Create another calendar with auto-generated ID
+let calendar2 = calendar__builder(0);
 calendar2.name = "My Second Calendar";
 set_description(calendar2, "Another calendar for testing");