Historical saved views still store selectedFields in the pre-v5 shape
(key/dataType/type). Migration 111 only rewrote rows whose spec failed to
unmarshal, and legacy-shaped entries unmarshal cleanly into zero-valued
TelemetryFieldKeys, so those rows were left on disk untouched and now read
back with empty name/signal/fieldContext/fieldDataType.
Add migration 113 to remap key -> name, type -> fieldContext and
dataType -> fieldDataType, including the legacy enum spellings that have no
current alias (spanSearchScope, array(x)). Entries with neither name nor key
are dropped. Already-valid entries pass through as raw bytes so description
and unit survive.
Also require selectedFields[].name in SavedViewSpec.Validate so neither API
version can write nameless entries again.
Assisted-by: Claude Opus 5
08607fac9d