VVS: Missing Stop-IDs (on Station Level) for ServiceAlerts

[sebastianknopf]

Description
The VVS GTFS-RT ServiceAlerts feed references several stops with their global ID on station level. Example:

{
      "id": "047dd163-5688-50c4-a166-1e71e8ece5cb",
      "alert": {
        "active_period": [
          {
            "start": "1785726000",
            "end": "1789163700"
          }
        ],
        "informed_entity": [
          {
            "agency_id": "VVS",
            "route_id": "vvs:31X18: :R:j26",
            "stop_id": "de:08116:4305",
            "direction_id": 1
          },
          {
            "agency_id": "VVS",
            "route_id": "vvs:31X18: :R:j26",
            "stop_id": "de:08116:2953",
            "direction_id": 1
          },
          {
            "agency_id": "VVS",
            "route_id": "vvs:31X18: :R:j26",
            "stop_id": "de:08116:2931",
            "direction_id": 1
          },
          {
            "agency_id": "VVS",
            "route_id": "de:vvs:vvs-31-189:",
            "stop_id": "de:08116:4305",
            "direction_id": 0
          },
          {
            "agency_id": "VVS",
            "route_id": "de:vvs:vvs-31-189:",
            "stop_id": "de:08116:2953",
            "direction_id": 0
          },
          {
            "agency_id": "VVS",
            "route_id": "de:vvs:vvs-31-189:",
            "stop_id": "de:08116:2931",
            "direction_id": 0
          },
          {
            "agency_id": "VVS",
            "route_id": "vvs:31X18: :H:j26",
            "stop_id": "de:08116:4305",
            "direction_id": 0
          },
          {
            "agency_id": "VVS",
            "route_id": "vvs:31X18: :H:j26",
            "stop_id": "de:08116:2953",
            "direction_id": 0
          },
          {
            "agency_id": "VVS",
            "route_id": "vvs:31X18: :H:j26",
            "stop_id": "de:08116:2931",
            "direction_id": 0
          },
          {
            "agency_id": "VVS",
            "route_id": "de:vvs:vvs-31-189:",
            "stop_id": "de:08116:4305",
            "direction_id": 1
          },
          {
            "agency_id": "VVS",
            "route_id": "de:vvs:vvs-31-189:",
            "stop_id": "de:08116:2953",
            "direction_id": 1
          },
          {
            "agency_id": "VVS",
            "route_id": "de:vvs:vvs-31-189:",
            "stop_id": "de:08116:2931",
            "direction_id": 1
          }
        ],
        "cause": "UNKNOWN_CAUSE",
        "effect": "UNKNOWN_EFFECT",
        "url": {
          "translation": [
            {
              "text": "https://www.vvs.de/verbindungen-und-mobilitaet/aktuelle-meldungen",
              "language": "de"
            }
          ]
        },
        "header_text": {
          "translation": [
            {
              "text": "Nürtingen: Haltestelle Kroatenhof verlegt",
              "language": "de"
            }
          ]
        },
        "description_text": {
          "translation": [
            {
              "text": "<b>Von Montag, 03. August 2026 ab 05:00 Uhr bis Samstag, 12. September 2026, Betriebsschluss </b>\r\nkann die Haltestelle Nürtingen Kroatenhof von den Buslinien 189 und X18 in beiden Richtungen aufgrund von Bauarbeiten nicht angefahren werden.<br><br>\r\n<p>Ersatzhaltestellen Metzinger Straße 24 und gegenüber</p>",
              "language": "de"
            }
          ]
        }
      }
    }

However, in the static GTFS feed most stops are only modeled as stops with their global ID on stop level, not on station level. Only some few stations are available and correctly modeled in the GTFS static data. Example for the alert shown above:

In the GTFS-RT ServiceAlerts feed, there's only a reference to the station with de:08116:2953, not to the stop.

Notice: At first glance, this seems to be a duplicate of #158. The difference here is that the temporarily not served stops are available in the feed, but the station for the stops is not modeled or the service alerts reference the wrong entity type.

Links
https://download.vvs.de/gtfs_realtime.zip
https://gtfsr-servicealerts.vvs.de/

[maxkobaldVVS]

@sebastianknopf What is the expected behaviour? Adding parent-elements in the stops.txt?

[hbruch]

There are different options: either to provide parent stations in the GTFS feed as well, or use the quay ids in gtfs-rt alerts feeds.

For stadtnavi, we replace the parent station by all it's child stations, assuming the quays have the same parent station ifopt as the parent station (which is explicitly not recommended to do, we know). See this translator for infos