what's your go-to strategy for database schema changes in production? dont want to mess that up.

hey folks, im curious about how everyone handles schema migrations in live production environments. weve been doing a lot of iteration lately and the fear of breaking things during a deploy is always there. are you big fans of blue-green deployments for dbs, or do you prefer more incremental approaches with feature flags? what tooling or patterns have saved you from a p1 incident?