update

backend/src/services/events.service.ts

@@ -78,13 +78,23 @@ function formatIcalDate(date: Date): string {
 
 /** Fold long iCal lines at 75 octets (RFC 5545 §3.1) */
 function icalFold(line: string): string {
-  if (line.length <= 75) return line;
+  if (Buffer.byteLength(line, 'utf-8') <= 75) return line;
   let folded = '';
-  while (line.length > 75) {
-    folded += line.slice(0, 75) + '\r\n ';
-    line = line.slice(75);
+  let currentLine = '';
+  let currentBytes = 0;
+
+  for (const char of line) {
+    const charBytes = Buffer.byteLength(char, 'utf-8');
+    if (currentBytes + charBytes > 75) {
+      folded += currentLine + '\r\n ';
+      currentLine = char;
+      currentBytes = 1 + charBytes; // continuation line leading space = 1 byte
+    } else {
+      currentLine += char;
+      currentBytes += charBytes;
+    }
   }
-  folded += line;
+  folded += currentLine;
   return folded;
 }
 
@@ -241,7 +251,7 @@ class EventsService {
          v.alle_gruppen, v.zielgruppen, v.abgesagt, v.anmeldung_erforderlich
        FROM veranstaltungen v
        LEFT JOIN veranstaltung_kategorien k ON k.id = v.kategorie_id
-       WHERE (v.datum_von BETWEEN $1 AND $2 OR v.datum_bis BETWEEN $1 AND $2)
+       WHERE (v.datum_von BETWEEN $1 AND $2 OR v.datum_bis BETWEEN $1 AND $2 OR (v.datum_von <= $1 AND v.datum_bis >= $2))
          AND (
            v.alle_gruppen = TRUE
            OR v.zielgruppen && $3
@@ -388,6 +398,7 @@ class EventsService {
     const effectiveLimit = limitDate < maxDate ? limitDate : maxDate;
 
     let current = new Date(startDate);
+    const originalDay = startDate.getDate();
 
     while (dates.length < 100) {
       // Advance to next occurrence
@@ -400,10 +411,15 @@ class EventsService {
           current = new Date(current);
           current.setDate(current.getDate() + 14);
           break;
-        case 'monatlich_datum':
+        case 'monatlich_datum': {
           current = new Date(current);
-          current.setMonth(current.getMonth() + 1);
+          const targetMonth = current.getMonth() + 1;
+          current.setDate(1);
+          current.setMonth(targetMonth);
+          const lastDay = new Date(current.getFullYear(), current.getMonth() + 1, 0).getDate();
+          current.setDate(Math.min(originalDay, lastDay));
           break;
+        }
         case 'monatlich_erster_wochentag': {
           const targetWeekday = config.wochentag ?? 0; // 0=Mon
           current = new Date(current);