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it might be that a previous migration was interrupted and the database has an invalid state now.
Try to delete and recreate the database. We only encountered this error so far on initial database migrations.

Metabase embedded dashboards don’t load

Embedded dashboards that fail to load could be caused by a changed administrator password for Metabase. If you changed the password for the main admin in the UI, you will have to also update the corresponding adminPass value in the Metabase section of values.yaml. Run ./upgrade.sh inside the package afterwards and try reloading the embedded dashboards.