Database initialization collisions

[ernstwi]

When starting the Docker containers for the first time, I have noticed that there can be trouble if multiple containers/threads try to initialize the database at the same time.

The API is multithreaded by default so will always have this problem.

A simple solution is to start the sync service first on its own (with postgres): docker-compose up postgres sync

But there are more elegant solutions of course.

[pnts-se]

We now wait for sync service to start in docker-compose.yml