rb-constraint-debug

name	rb:constraint-debug
description	Diagnosing Active Record constraint failures: unique-index, foreign-key, NOT-NULL violations. Triggers: "constraint error", "unique violation", "foreign key", "PG::UniqueViolation".
argument-hint	[error|path]
effort	medium

Constraint Debug

Check:

• the actual database constraint or index definition
• whether application validation matches database truth
• whether the failing write should be wrapped in a transaction or lock
• whether stale data or a bad migration introduced the mismatch

References

Need	Reference
race-condition upserts, FK violations, check-constraint debugging recipes	${CLAUDE_SKILL_DIR}/references/constraint-patterns.md