Tick Tock is when you do a migration in two steps to avoid breaking.
Tick
Imagine we have 2 different models/collections/tables to store transactions (TransactionModel) and refund transactions (TransactionRefundModel)
However, you figure it out that this 2 models should be the same collection.
What is the best approach to convert all TransactionRefundModel to TransactionModel?
The best approach is to start writing the refund transaction for both old and new model.
After this is done, you can compare if you are not losing information in this migration.
Then, you write a migration to migrate the old data to the new data.
This is the Tick part of the migration. You have 2 models working together.
Tock
The Tock part is modifying the code to read from the new data only.
After the reading new data is done and correct.
You can stop writing data to the old data.
Do not forget to cleanup the old data and code.
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