#user session timestamp url
user1 session11 100 /one
user1 session11 110 /two
user1 session11 125 /three
user2 session21 200 /yelnats
user2 session21 202 /one/uno
user2 session21 205 /whatever
user2 session21 210 /something_else
user2 session21 610 /something_else