MySQL innoDB disk file size (1 reply)

I am setting up a solution that will insert arount 100 million records in a table per month and every row will have a timestamp that will be indexed. The idea is to only store data regardiong the last 3 months in this table, so the total row count in this table will be approximately 300 million rows. Therefore every night an event will delete the rows that are older that 3 months.

I understand that the innodb files can never be reduced in size but in this case, will the innodb file size grow for every month when new data is inserted or will the new data replace the deleted data file storage?