lines can be long

models.py

@@ -57,7 +57,8 @@ class Stop(db.Model):
     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="")
+    # Text, not String(n): big interchanges (Linz Hbf) exceed a few hundred chars.
+    lines = db.Column(db.Text, nullable=False, default="")
 
     def line_list(self) -> list[str]:
         return [ref for ref in self.lines.split(";") if ref]