HighFile-scopeRuby Plug & play

Add transaction blocks for data consistency

Wrap multi-record changes in a database transaction and use bang methods to ensure rollback on failure.

Why this matters

Keeps data consistent when any step fails.

Side-by-side examples engineers can pattern-match during review.

Avoid

user.update!(a: 1); order.save!; payment.save! # without transaction

Prefer

ActiveRecord::Base.transaction do
  user.update!(a: 1)
  order.save!
  payment.save!
end

Bad

multiple saves without transaction

Good

ActiveRecord::Base.transaction { ... }

From the same buckets as this rule.

Critical
Block risky database migrations (locking ops, downtime risk)
Review SQL/database migrations for operations that can lock large tables or cause downtime. Examples: creating indexes without CONCURRENTLY (Postgres), ALTER COLUMN TYPE on big tables, adding NOT NULL without backfill, long-running updates without batching. Require an online migration strategy (CONCURRENTLY, backfill in batches, dual-write/expand-contract) and a rollback plan.
migrations-backward-compatdatabase-query-performance
High
Add database indexes for query optimization
Index frequently filtered or joined columns and verify with query plans.
database-query-performanceperformance-efficiency
High
Add database indexes for query performance
Index columns used in WHERE/JOIN/ORDER and enforce uniqueness where applicable.
database-query-performance