feat: MAC lookup in scan FDB (API mac-locations, UI table, index)

Made-with: Cursor

internal/scans/postgres_store.go

@@ -534,6 +534,37 @@ limit $2`,
 	return out
 }
 
+func (s *PostgresStore) ListPortDevicesByMac(scanID string, mac string, limit int) []PortDeviceResult {
+	if limit <= 0 {
+		limit = 5000
+	}
+	if mac == "" {
+		return nil
+	}
+	query := `
+select ip::text, if_index, bridge_port, vlan, coalesce(mac, ''), coalesce(learned_ip::text, ''), checked_at
+from scan_port_devices
+where scan_id = $1
+  and lower(replace(trim(coalesce(mac, '')), '-', ':')) = lower(replace(trim($2::text), '-', ':'))
+order by ip::text asc, if_index asc, vlan asc, mac asc, learned_ip asc
+limit $3`
+	rows, err := s.db.QueryContext(context.Background(), query, scanID, mac, limit)
+	if err != nil {
+		return nil
+	}
+	defer rows.Close()
+
+	out := make([]PortDeviceResult, 0, 32)
+	for rows.Next() {
+		var r PortDeviceResult
+		if err = rows.Scan(&r.IP, &r.IfIndex, &r.BridgePort, &r.Vlan, &r.MAC, &r.LearnedIP, &r.CheckedAt); err != nil {
+			return nil
+		}
+		out = append(out, r)
+	}
+	return out
+}
+
 func (s *PostgresStore) PurgeAllScanData() error {
 	// Дочерние таблицы ссылаются на scan_jobs — CASCADE очищает всё; RESTART IDENTITY сбрасывает bigserial.
 	_, err := s.db.ExecContext(context.Background(), `truncate table scan_jobs restart identity cascade`)