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Junker der Provinz
654502ce8f
GetTaskPolicy dereferenced its MaintenancePolicy argument to look at TaskPolicies, so IsTaskEnabled, GetMaxConcurrent and GetRepeatInterval all took the admin process down when handed a nil policy. A nil policy is not a programming error here: MaintenanceConfig.Policy is unset until something builds one, DefaultMaintenanceConfig returns a config with no policy at all, and UpdateConfig installs whatever config it is given. Found by calling IsTaskEnabled with the policy from a freshly defaulted MaintenanceConfig. Treat a nil policy as "no entry": no task enabled, the safe concurrency default of 1, and a repeat interval of 0 so callers fall back to their own default instead of reading DefaultRepeatIntervalSeconds off nil. Also add the startup test this was found with. It walks the admin server's startup sequence over a data directory that has balance saved as disabled and checks the state that decides whether issue #10874 happens: the balance detector reports disabled, vacuum stays enabled, and tasks whose config was never saved keep their compiled-in default. Refs #10874