feat: improve scheduler recurrence, DB config, and docs

- Broaden scheduler query window to next N days for proper recurring event expansion (scheduler.py)
- Update DB connection logic for consistent .env loading and fallback (database.py)
- Harden timezone handling and logging in scheduler and DB utils
- Stop auto-deactivating recurring events before recurrence_end (API/events)
- Update documentation to reflect new scheduler, API, and logging behavior

server/routes/events.py

@@ -48,10 +48,22 @@ def get_events():
         else:
             end_dt = e.end
 
-        # Setze is_active auf False, wenn Termin vorbei ist
-        if end_dt and end_dt < now and e.is_active:
-            e.is_active = False
-            session.commit()
+        # Auto-deactivate only non-recurring events past their end.
+        # Recurring events remain active until their RecurrenceEnd (UNTIL) has passed.
+        if e.is_active:
+            if e.recurrence_rule:
+                # For recurring, deactivate only when recurrence_end exists and is in the past
+                rec_end = e.recurrence_end
+                if rec_end and rec_end.tzinfo is None:
+                    rec_end = rec_end.replace(tzinfo=timezone.utc)
+                if rec_end and rec_end < now:
+                    e.is_active = False
+                    session.commit()
+            else:
+                # Non-recurring: deactivate when end is in the past
+                if end_dt and end_dt < now:
+                    e.is_active = False
+                    session.commit()
         if not (show_inactive or e.is_active):
             continue