Data engineering·Governance, privacy and meaning
raw events older than thirteen months are deleted automatically, and nobody has to remember to do it.
Retention policy
Also calleddata retention, deletion schedule
A rule for how long each class of data is kept and what happens then. It is simultaneously a cost control, a legal obligation and a risk reduction, since data you no longer hold cannot leak. It is nearly always easier to implement at the partition level than by row, which is another reason partitioning by time is worth doing before you need it.