Add valid lines to stops

models.py

@@ -55,6 +55,12 @@ class Stop(db.Model):
     municipality = db.Column(db.String(120))
     latitude = db.Column(db.Float, nullable=False)
     longitude = db.Column(db.Float, nullable=False)
+    # ";"-joined line refs serving this stop (e.g. "693" or "S2;U4;WLB"), from
+    # OSM route relations; empty when unknown. Used by the "Linie" autocomplete.
+    lines = db.Column(db.String(255), nullable=False, default="")
+
+    def line_list(self) -> list[str]:
+        return [ref for ref in self.lines.split(";") if ref]
 
     __table_args__ = (
         db.UniqueConstraint("osm_type", "osm_id", name="uq_stops_osm"),