# Which Problems Are Solved
If configuration `notifications.LegacyEnabled` is set to false when
using cockroachdb as a database Zitadel start does not work and prints
the following error: `level=fatal msg="unable to start zitadel"
caller="github.com/zitadel/zitadel/cmd/start/start_from_init.go:44"
error="can't scan into dest[0]: cannot scan NULL into *string"`
# How the Problems Are Solved
The combination of the setting and cockraochdb are checked and a better
error is provided to the user.
# Additional Context
- introduced with https://github.com/zitadel/zitadel/pull/9321
# Which Problems Are Solved
The recently introduced notification queue have potential race conditions.
# How the Problems Are Solved
Current code is refactored to use the queue package, which is safe in
regards of concurrency.
# Additional Changes
- the queue is included in startup
- improved code quality of queue
# Additional Context
- closes https://github.com/zitadel/zitadel/issues/9278
# Which Problems Are Solved
To integrate river as a task queue we need to ensure the migrations of
river are executed.
# How the Problems Are Solved
- A new schema was added to the Zitadel database called "queue"
- Added a repeatable setup step to Zitadel which executes the
[migrations of
river](https://riverqueue.com/docs/migrations#go-migration-api).
# Additional Changes
- Added more hooks to the databases to properly set the schema for the
task queue
# Additional Context
- Closes https://github.com/zitadel/zitadel/issues/9280
