Database changes affect everyone on the team. The frontend developer needs to be aware of new fields. The QA team needs updated test data. IT Project Management Services often help coordinate these conversations across different teams and departments.
Hold quick stand-ups when database changes come up—five minutes max. Just enough to make sure everyone's on the same page and nobody gets blindsided.
Document changes in your sprint notes. Future team members will need this context when they're wondering why certain decisions were made.