Also, add -Werror to tests so that no warnings in tests are reported anymore.

Start worker in tests

Also, fix for notifications throttle delay value

This contains only data, removes some Database dependency in imports.

Also, some test refactoring and add servant-client to tests.

Get rid of that TVar completely.

Added more tests for more subtle cases.

Also, some fixes to NodeStory (it inserts ngrams when saving node
story, when they don't exist).