Database tasks for 'Follow-up Required' feature

[Daniel-Warner-X]

1. Schema Changes

   • Implement the required database schema changes to add the new fields to the Visit table.
   • Ensure the changes are completed with no perceptible impact on performance.

2. Data Persistence

   • Ensure that the follow-up required flag and notes are correctly persisted in the database.
   • Implement any necessary migrations to handle existing data.