adds not null db constraint on members.member_uid, adds unique index on members.member_uid (#713)

Author: nflorentin

db/migrate/20231120164231_add_not_null_constraint_to_member_uid_in_members.rb

@@ -0,0 +1,5 @@
+class AddNotNullConstraintToMemberUidInMembers < ActiveRecord::Migration[6.1]
+  def change
+    change_column_null :members, :member_uid, false
+  end
+end

db/migrate/20231120164346_add_unique_index_on_member_uid_in_members.rb

@@ -0,0 +1,5 @@
+class AddUniqueIndexOnMemberUidInMembers < ActiveRecord::Migration[6.1]
+  def change
+    add_index :members, [:organization_id, :member_uid], unique: true
+  end
+end