Stage 3 Task 3.2. BalancePreflightSweepJob now mirrors freeze/unfreeze state
onto projects.paused_at so SupplierSnapshotGuard has the right hook to block
delete/change_source while the supplier slepok tail can still arrive:
- On freeze: capture freezeAt = now() once, set tenant.frozen_by_balance_at
AND projects.paused_at (only WHERE paused_at IS NULL) to the same moment.
This gives the snapshot guard a uniform recent paused_at across all of the
tenant's projects.
- On unfreeze: capture frozen_at_was BEFORE save, then clear paused_at only
on projects whose paused_at >= frozen_at_was (== auto-paused by us).
Manual pauses set by the client BEFORE freeze have paused_at < frozen_at_was
and stay preserved.
Spec §4.3.2.
Дмитрий
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