On CE (without private feature), v2_job_debounce_batch is never
populated because maybe_debounce_post_preprocessing is EE-only.
The accumulation query returns zero rows, producing an empty array
that replaces the original nodes_to_relock value. This causes flow
modules to never get relocked when triggered by relative imports.
Fix: only replace the original value when the batch query actually
returned entries to accumulate.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>