diff --git a/db/migrate/20250630040849_add_index_post_locale_post_id.rb b/db/migrate/20250630040849_add_index_post_locale_post_id.rb
deleted file mode 100644
index becff14..0000000
--- a/db/migrate/20250630040849_add_index_post_locale_post_id.rb
+++ /dev/null
@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-class AddIndexPostLocalePostId < ActiveRecord::Migration[7.2]
-  disable_ddl_transaction!
-
-  def up
-    # clean up invalid index if index creation timeout
-    execute <<~SQL
-      DROP INDEX IF EXISTS index_discourse_translator_post_locales_on_post_id
-    SQL
-
-    execute <<~SQL
-      CREATE UNIQUE INDEX CONCURRENTLY index_discourse_translator_post_locales_on_post_id
-      ON discourse_translator_post_locales (post_id)
-    SQL
-  end
-
-  def down
-    raise ActiveRecord::IrreversibleMigration
-  end
-end
diff --git a/db/migrate/20250701042909_clear_dupes_add_index_to_post_locale.rb b/db/migrate/20250701042909_clear_dupes_add_index_to_post_locale.rb
new file mode 100644
index 0000000..6f7beb1
--- /dev/null
+++ b/db/migrate/20250701042909_clear_dupes_add_index_to_post_locale.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class ClearDupesAddIndexToPostLocale < ActiveRecord::Migration[7.2]
+  disable_ddl_transaction!
+
+  def up
+    execute <<~SQL
+      DELETE FROM discourse_translator_post_locales
+      WHERE id IN (
+        SELECT id
+        FROM (
+          SELECT id,
+                 ROW_NUMBER() OVER (
+                   PARTITION BY post_id
+                   ORDER BY created_at DESC, id DESC
+                 ) AS rnum
+          FROM discourse_translator_post_locales
+        ) t
+        WHERE t.rnum > 1
+      )
+    SQL
+
+    execute <<~SQL
+      DROP INDEX IF EXISTS index_discourse_translator_post_locales_on_post_id
+    SQL
+
+    execute <<~SQL
+      CREATE UNIQUE INDEX CONCURRENTLY index_discourse_translator_post_locales_on_post_id
+      ON discourse_translator_post_locales (post_id)
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end