[Snapshots] Scheduled snapshot exports corrupt relationship/subquery fields to “[object Object]” #71

Severity

High — scheduled backups of relationship queries are unrecoverable in CSV/XML/Excel.

What happens

The scheduled-export path stores raw records and derives only top-level keys — it never runs flattenRecord like the interactive path. A schedule for SELECT Id, Account.Name FROM Contact produces a snapshot whose Account value is a nested object; downloading as CSV/XML runs String(value) → the cell contains the literal text [object Object] and Account.Name is lost. Excel hands the raw object to SheetJS. Subquery results corrupt the same way. Only JSON survives.

Evidence

• src/ui/screens/SnapshotCenterScreen.tsx:136
• src/services/salesforce/queryAll.ts:56; src/ui/utils/csv.ts:11
• Storage: src/background/index.ts:2298-2300

Suggested fix

Run snapshot records through flattenRecord/deriveColumns before export, same as the interactive path.

Environment

Commit 74cf21b (main), WaveLink 0.6.0. Found in the 2026-08-31 adversarial audit (code-verified).