* OPIK-419 insert single and batch traces
* OPIK-419 null timestamp
* OPIK-419 create single and batch
* OPIK-419 coverage create single trace
* OPIK-419 add a couple of todos to not forget
* OPIK-419 refactor
* OPIK-419 refactor
* OPIK-419 cover batch
* OPIK-419 update trace failing test
* OPIK-419 update trace failing test green
* OPIK-419 remove comment
* OPIK-419 fix broken test
* OPIK-419 projectdao not public
* OPIK-419 pr comments
* OPIK-419 cover new functionality in service test
* OPIK-419 handle async update to last_trace_updated_at
* OPIK-419 default null