MBTA alerts log

Point-in-time view of the MBTA /alerts feed, backed by the temporal alerts_history table in Postgres and served by the serve binary in this repo.

Pick a timestamp with the picker below — or scrub through the timeline of recorded change events — and the active set of alerts re-fetches automatically. Use the filters at the bottom to narrow the view.

Manual timestamp

Active when Time picker mode is Manual. Pick a date/time.

Scrub timeline

Active when Time picker mode is Scrub. Fetches every distinct change-event timestamp in the window below and lets you step / play through them. The slider snaps to actual transitions only, so each tick is an instant where the active-alerts set was different from the one before it.

Change events in window: **** · Playhead: ****

Active alerts

Showing **** of **** alerts after filters.