Data Migrator & Merger is for merging/migrating the data/records of two database of completely same or similar schema.
Consider the oldschema.sql and newschema.sql. In user_table in oldschema.sql user_created_date is missing but user_created_date is
present in newschema.sql. Now, both schemas are not completely identical. And you want to put the data from oldschema to newschema or
may be from newschema to oldschema, Data Merger will help you in the situation.
The above scenario is simple use case. Use case can vary from small to large.