I am in charge of a task of migrating data from MySQL to PostgreSQL. I have already migrated the MySQL database to PostgreSQL with the help of pgloader. My problem is I need to insert the data from the migrated PostgreSQL to our production PostgreSQL which is using Django as backend. I have mapped the columns for each database and the numbers don't match. We have more columns in our production DB than the one that I migrated.
I want to know what to do with the fields/columns that will not be filled with data and has a NOT NULL constraints? How should I approach this? I am new in this kind of task and my apologies for asking.