add period tables to drop command
move innodb selection to MySQL session instead of in CREATE TABLE
drop log_analyze_periods__% correctly
make processing a bit more verbose
TODO: query to check if chunks overlap
change name of columns containing additional metadata
change definition of academic year
add from and end dates to period table
properly specfy foreign keys
keep track of creation time and upadte time of period data
keep track of which periods we have touched
calculate total number of users and logins per periode
Woopsie, forgot to add period-info function
calculate users/logins per period/sp/idp
order periods logically