Feature data ingest

[afoucret]

Create additional indices to store data from the tracker :

• tracking_log_event : Store individual tracking events

• tracking_log_session : Store aggregated session data for easier parsing

[romainruaud]

@afoucret I do not see any low priority or locking prevention system on your resource model responsible for event data saving. Is this normal ?

[afoucret]

Locking should not be a problem there as the table should be kept small by deleting event when indexed. So every minute, events are indexed and deleted from the DB.

I will merge as it and we will see in the future we need some optimization of the ingest process.