#125 added a SELECT EXISTS guard before WorkspaceHandler.Update applies
any UPDATE so nonexistent workspace IDs return 404 instead of silent
zero-row successes. The 4 existing WorkspaceUpdate_* sqlmock tests
didn't mock the probe, so they broke on main. This was not caught
because CI is blocked by the Actions billing cap.
Adds ExpectQuery for the EXISTS probe to:
- TestWorkspaceUpdate_ParentID
- TestWorkspaceUpdate_NameOnly
- TestWorkspaceUpdate_MultipleFields
- TestWorkspaceUpdate_RuntimeField
TestWorkspaceUpdate_BadJSON doesn't need the fix — it aborts on
c.ShouldBindJSON before reaching the guard.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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