Fixed constraint for age restriction

[celinewmk]

The constraint we created to verify that a patient is at least 15 years old does not work when adding to Postgres.

Current constraint: CHECK(CAST(DATEDIFF(DD, date_of_birth, GETDATE())/365.25 AS INT) >= 15)

[kienmarkdo]

Fixed this in the recent commit

[kienmarkdo]

Inserting this into the table will not work. I tested it on onecompiler and pgadmin.