I need to make a structure for a mysql database I have a table that saves users:
Email || Username || age || password
and I need to save the series they have seen and the ones they are watching and as I have read it is not correct to insert two columns with vectors that save the series, how can I do it?
Build another table with 3 columns


the primary key of users (perhaps email?).
what they are watching,
when. 


Each user would have any number (0 or more) rows in this table.

Think this way:  When you need a "vector", make a new table.