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The backfill computed amount = outflow_entry.amount - source_fee_amount and then added a check constraint requiring amount >= 0. Historical rows that predate the modern sign convention (negative outflow amounts) or carry fees larger than the entry amount produce a negative principal, so the constraint aborts the migration with PG::CheckViolation — blocking db:prepare and the entire upgrade for affected self-hosters. Normalize with ABS and clamp at zero in the backfill. Rows that already satisfied the old expression are unchanged (ABS is a no-op for positive amounts); only previously-failing rows now migrate instead of killing the upgrade. Fixes #2653 Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>