fix: remove all oc sentences

server/migrations/20221027223900-remove-oc.js

@@ -0,0 +1,13 @@
+"use strict";
+
+// https://github.com/common-voice/sentence-collector/issues/641
+
+module.exports = {
+  up: async (queryInterface) => {
+    await queryInterface.sequelize.query(`
+      DELETE FROM Sentences
+      WHERE localeId = "oc"
+    `);
+  },
+  down: () => Promise.resolve(),
+};