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Many of these do depend on the Synapse master process (`matrix-synapse.service`),
so it makes sense to do it.
Furthermore, we're doing it so that one can stop the `matrix-synapse.service`
service and have systemd cascade this into stopping all the workers as well.
This is useful for easily stopping all of Synapse, so that Postgres
upgrades (`--tags=upgrade-postgres`) can happen cleanly.
Postgres upgrades currently stop `devture_postgres_systemd_services_to_stop_for_maintenance_list` which
includes Synapse, but stopping just the master process and leaving workers running is not safe enough and sometimes leads to errors like:
> ERROR: insert or update on table "event_forward_extremities" violates foreign key constraint "event_forward_extremities_event_id"
With this dependency in place, stopping `matrix-synapse.service` will stop all Synapse processes.