December is DoorDash's busiest month. The courier experience team wants to see how hard couriers worked: how many deliveries, on how many days, and how much breathing room between pickups.
For each courier with a pickup in December 2025, show the number of deliveries, the number of different days they picked up orders, and the average minutes between consecutive pickups on the same day.
Expected output
avg_gap_minutes rounded to 1 decimal (empty if they never had two pickups on one day); any row orderExample of the shape (made-up values):
| courier_id | deliveries | active_days | avg_gap_minutes |
|---|---|---|---|
| 12 | 34 | 21 | 95.3 |
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