A visit is #1042, not 4cc216ca-dad3-4958-bb96-5f5a82022cf8

Every other thing in this product a person refers to already had a
readable reference: a shop is chennai, a camera cam1, a customer V-42, a
person their email. An audit of every list response found exactly one
gap, and it was the row people look at most - the arrivals feed showed a
visit as 36 hex characters.

012 argued no route takes a visit id so none was needed. That is true of
routing and false of everything else: it is what the feed shows, what a
support conversation quotes, and what somebody reading an API response
judges the product by.

Migration 014 mirrors the visitor scheme exactly - per client, so it
discloses no platform-wide volume, and beside the uuid rather than
instead of it. A stored counter is affordable on the busiest table
because visits from one tenant are already serialised by the consumer's
SetOrderMatters(true), so it adds no contention that was not already
there. A derived reference was the alternative and does not work:
several people through one door share occurred_at to the microsecond,
which is the collision 004 exists to handle.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KGcjxF1cNLcuwc3DAPcnfj

server/internal/store/store.go

@@ -113,10 +113,15 @@ func (s *Store) RecordVisit(ctx context.Context, site ingest.Site,
 	// visitor for a visit we already recorded.
 	var visitID string
 	err = tx.QueryRow(ctx, `
+		WITH n AS (
+		    UPDATE clients SET visit_seq = visit_seq + 1
+		     WHERE id = $1 RETURNING visit_seq
+		)
 		INSERT INTO visits (client_id, site_id, source_event_id, occurred_at,
 		                    camera_id, is_new_visitor, similarity, quality,
-		                    attributes, image_key)
-		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, COALESCE($9, '{}'::jsonb), $10)
+		                    attributes, image_key, number)
+		SELECT $1, $2, $3, $4, $5, $6, $7, $8, COALESCE($9, '{}'::jsonb), $10, n.visit_seq
+		  FROM n
 		ON CONFLICT (client_id, source_event_id) DO NOTHING
 		RETURNING id::text`,
 		site.ClientID, site.SiteID, v.EventID, v.OccurredAt, v.CameraID,