[deploy] Cleanup orphaned Ahoy rows in the DB (#9710)

* Cleanup orphaned Ahoy rows in the DB

* Trigger Travis correctly

lib/data_update_scripts/20200810083831_remove_orphaned_ahoy_rows.rb

@@ -0,0 +1,32 @@
+module DataUpdateScripts
+  class RemoveOrphanedAhoyRows
+    def run
+      # Delete all Ahoy::Events belonging to users that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM ahoy_events
+          WHERE user_id IS NOT NULL
+          AND user_id NOT IN (SELECT id FROM users);
+        SQL
+      )
+
+      # Delete all Ahoy::Messages belonging to users that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM ahoy_messages
+          WHERE user_id IS NOT NULL
+          AND user_id NOT IN (SELECT id FROM users);
+        SQL
+      )
+
+      # Delete all Ahoy::Visits belonging to users that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM ahoy_visits
+          WHERE user_id IS NOT NULL
+          AND user_id NOT IN (SELECT id FROM users);
+        SQL
+      )
+    end
+  end
+end