Add thumbnail disk database migration

server/initializers/migrations/0780-thumbnail-disk.ts

@@ -0,0 +1,47 @@
+import * as Sequelize from 'sequelize'
+
+async function up (utils: {
+  transaction: Sequelize.Transaction
+  queryInterface: Sequelize.QueryInterface
+  sequelize: Sequelize.Sequelize
+}): Promise<void> {
+  const { transaction } = utils
+
+  {
+    const data = {
+      type: Sequelize.BOOLEAN,
+      allowNull: true,
+      defaultValue: true
+    }
+
+    await utils.queryInterface.addColumn('thumbnail', 'onDisk', data, { transaction })
+  }
+
+  {
+    // Remote previews are not on the disk
+    await utils.sequelize.query(
+      'UPDATE "thumbnail" SET "onDisk" = FALSE ' +
+      'WHERE "type" = 2 AND "videoId" NOT IN (SELECT "id" FROM "video" WHERE "remote" IS FALSE)',
+      { transaction }
+    )
+  }
+
+  {
+    const data = {
+      type: Sequelize.BOOLEAN,
+      allowNull: false,
+      defaultValue: null
+    }
+
+    await utils.queryInterface.changeColumn('thumbnail', 'onDisk', data, { transaction })
+  }
+}
+
+function down (options) {
+  throw new Error('Not implemented.')
+}
+
+export {
+  up,
+  down
+}