fix: remove BE sentences from two authors if not yet approved

server/migrations/20210708212100-remove-partly-not-yet-approved-be-sentences.js

@@ -0,0 +1,25 @@
+'use strict';
+
+// Delete sentences from two authors if not approved, as
+// bulk uploads covered them and has better quality.
+// https://discourse.mozilla.org/t/sentence-collection-for-belarusian-request-for-advice/82150/14
+
+module.exports = {
+  up: (queryInterface) => {
+    return  queryInterface.sequelize.query(`
+      WITH IDsToDelete AS (SELECT
+          Sentences.id
+        FROM Sentences
+        LEFT JOIN Votes ON (Votes.sentenceId=Sentences.id)
+        WHERE Sentences.localeId = "be"
+        GROUP BY Sentences.id
+        HAVING
+          COUNT(Votes.approval) < 2 OR
+          COUNT(Votes.approval) = 2 AND SUM(Votes.approval) = 1
+      )
+      DELETE FROM Sentences WHERE id IN (SELECT id FROM IDsToDelete)
+        AND (source LIKE "%Максім Гарэцкі" OR source LIKE "%Кузьма Чорны");
+    `);
+  },
+  down: () => Promise.resolve(),
+};