| id | first_name | last_name | | -- | ---------- | --------- | | 1 | John | Doe | | 2 | Jane | Smith | | 3 | Alice | Johnson | | 4 | Michael | Brown | | 5 | Emily | Davis |

| contact_id | type | duration | | ---------- | -------- | -------- | | 1 | incoming | 120 | | 1 | outgoing | 180 | | 2 | incoming | 300 | | 2 | outgoing | 240 | | 3 | incoming | 150 | | 3 | outgoing | 360 | | 4 | incoming | 420 | | 4 | outgoing | 200 | | 5 | incoming | 180 | | 5 | outgoing | 280 |