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Updates(&e) uses GORM's struct form, which skips zero-value fields -
but 0/"" is exactly the sentinel PRD 010 F1/F2 chose for "unconfigured"
(数据库变更.md §1.1). A caller resetting colWidth or defaultValue back
to that sentinel was therefore silently ignored: the row kept its old
value, the API reported success, and reopening the edit form showed the
stale number/string again.
Not fixed by switching to Select("*") - that would also start writing
this struct's other zero-valued fields (Sort, the Pk/Required/... bools),
none of which are part of this change. A second, map-form Updates
scoped to just these two columns writes the sentinel without touching
anything else; map-form Updates does not skip zero values.
TestSysColumnsUpdateClearsSentinelFields pins the regression: seed
150/"active", update to 0/"", read back and assert it stuck. Confirmed
red before this change (got 150/"active" back) and green after.