fix(vocab): remove obsolete Bisaya SRS cards

backend/migrations-active/20261005000000-cleanup-bisaya-obsolete-srs-cards.cjs

@@ -0,0 +1,36 @@
+'use strict';
+
+/**
+ * Removes obsolete or incorrectly split Bisaya SRS cards that were created by
+ * older course imports.  The current course content already uses the intended
+ * Spanish-derived tens and complete repair phrases.
+ */
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.sequelize.query(`
+      DELETE FROM community.vocab_srs_item
+      WHERE course_id = 1
+        AND (
+          lower(learning) ~ '(kawhaan|katloan|kalim[- ]?an|kanum[- ]?an|kap[- ]?atan|kapitoan|kawaloan|kasiyaman)'
+          OR lower(reference) ~ '(kawhaan|katloan|kalim[- ]?an|kanum[- ]?an|kap[- ]?atan|kapitoan|kawaloan|kasiyaman)'
+        );
+
+      DELETE FROM community.vocab_srs_item
+      WHERE course_id = 1
+        AND (
+          (
+            regexp_replace(lower(learning), '[[:punct:][:space:]]', '', 'g') = 'bitte'
+            AND regexp_replace(lower(reference), '[[:punct:][:space:]]', '', 'g') = 'palihug'
+          )
+          OR (
+            lower(learning) = 'bitte wiederholen'
+            AND lower(reference) IN ('palihug', 'palihug ka mubalik?')
+          )
+        );
+    `);
+  },
+
+  async down() {
+    // Deleted legacy cards cannot be reconstructed reliably.
+  }
+};