Don't store remote rates of remote videos

In the future we'll stop to expose all available rates to improve users
privacy

server/initializers/migrations/0695-remove-remote-rates.ts

@@ -0,0 +1,28 @@
+import * as Sequelize from 'sequelize'
+
+async function up (utils: {
+  transaction: Sequelize.Transaction
+  queryInterface: Sequelize.QueryInterface
+  sequelize: Sequelize.Sequelize
+  db: any
+}): Promise<void> {
+  const query = 'DELETE FROM "accountVideoRate" ' +
+    'WHERE "accountVideoRate".id IN (' +
+      'SELECT "accountVideoRate".id FROM "accountVideoRate" ' +
+      'INNER JOIN account ON account.id = "accountVideoRate"."accountId" ' +
+      'INNER JOIN actor ON actor.id = account."actorId" ' +
+      'INNER JOIN video ON video.id = "accountVideoRate"."videoId" ' +
+      'WHERE actor."serverId" IS NOT NULL AND video.remote IS TRUE' +
+    ')'
+
+  await utils.sequelize.query(query, { type: Sequelize.QueryTypes.BULKDELETE, transaction: utils.transaction })
+}
+
+function down () {
+  throw new Error('Not implemented.')
+}
+
+export {
+  up,
+  down
+}