fix parent, teacher and admin pages

app/Models/Staff.php

@@ -132,6 +132,18 @@ class Staff extends BaseModel
                 ->first();
         }
 
+        // The table enforces unique email addresses, so a user cannot safely
+        // have multiple staff rows across different school years with the same
+        // generated email. If an exact school-year row is missing but the user
+        // already has any staff row, update that existing row instead of trying
+        // to insert a duplicate-email record.
+        if (!$existing) {
+            $existing = static::query()
+                ->where('user_id', $userId)
+                ->orderByDesc('id')
+                ->first();
+        }
+
         $now = now(); // use UTC if app.timezone=UTC (recommended)
 
         // Only allow fillable keys
@@ -195,4 +207,4 @@ class Staff extends BaseModel
             'updated_at'   => ['nullable', 'date'],
         ];
     }
-}
+}