# Bring in past data

**In short:** send your past counts once, and CountWatch knows your normal week from the first day: alerts start the same day instead of after about 3 weeks. The result also lists the alerts that history would have raised, so you see what you would have caught. Your agent can do this for you.

`POST /v1/import` takes bucket arrays per watch: `{metric, dimensions, start, resolution: 5m | 1h | 1d, counts[]}`, up to 90 days each and 1,000 watch-days per request. Add `labels` for known incidents (`real`) or expected changes, and `tz` for the watch's timezone. The answer is `202` with an `import_id`; poll `GET /v1/imports/{import_id}` until `status: done`. Each watch then shows the rules chosen for it and the alerts they would have raised in the replayed days: what this service would have told you.