fix(migration): isolate invalid legacy records and recover valid data #6242

Job	Run time
Shell Deploy Scripts	13s
Build Impact	18s
CLI Tests (ubuntu-latest)	9m 8s
Rust Build Check (ubuntu-latest)	13m 24s
Rust Build Check (macos-15)	13m 39s
Frontend Build	9m 55s
CLI Tests (macos-15)	9m 33s
Rust Build Check (windows-latest)	13m 24s
CLI Tests (windows-latest)	11m 14s
Impact-selected Linux / Relay Contract	0s
DSH Profile Packaging (windows-latest)	0s
Rust / CLI Validation	6s
	1h 20m 54s

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