Manual trigger of scheduled chains retrieval

[cr1xu5]

Thank you for pg_timetable!

Is your feature request related to a problem? Please describe.
When using pg_timetable in an integration test, the time until the next "Retrieve scheduled chains to run" is unknown and this makes the integration tests flaky.

Describe the solution you'd like
For example an API endpoint that triggers the retrieval of scheduled chains to run.

Describe alternatives you've considered

• Put various sleep moments in the integration tests.
• Stop testing with pg_timetable in the integration tests and test pg_timetable outside of CI/CD.

[pashagolub]

Hello.

Have you considered starting chains asynchronously with timetable.notify_chain_start() or with REST API endpoint?

If you're building sources yourself, you can change refetchTimeout constant for tests.