scan-limits-gating: paid-order gating + per-tag daily cap + per-IP hourly rate (6/6 scenarios) — no gateway

frontend/internal/db/queries.sql

@@ -47,8 +47,8 @@ INSERT INTO tags (tag_code) VALUES ($1)
 RETURNING *;
 
 -- name: InsertScan :one
-INSERT INTO scans (tag_id, lat, lng, location_shared, scanner_phone, fingerprint)
-VALUES ($1, $2, $3, $4, $5, $6)
+INSERT INTO scans (tag_id, lat, lng, location_shared, scanner_phone, fingerprint, ip)
+VALUES ($1, $2, $3, $4, $5, $6, $7)
 RETURNING *;
 
 -- name: GetLastAlertByTag :one
@@ -74,3 +74,14 @@ SELECT * FROM scans
 WHERE fingerprint = $1 AND id <> $2 AND scanned_at > now() - interval '24 hours'
 ORDER BY scanned_at DESC
 LIMIT 1;
+
+-- name: GetOrderByID :one
+SELECT * FROM orders WHERE id = $1;
+
+-- name: CountAlertsByTagSince :one
+SELECT count(*) FROM scans
+WHERE tag_id = $1 AND alert_sent = TRUE AND scanned_at > $2;
+
+-- name: CountAlertsByIPSince :one
+SELECT count(*) FROM scans
+WHERE ip = $1 AND alert_sent = TRUE AND scanned_at > $2;