I already use the SNCR option with Maximum neutral. The df output:

Dateisystem      1K-Blöcke     Benutzt   Verfügbar Verw% Eingehängt auf
udev               3957356           0     3957356    0% /dev
tmpfs               797788       12456      785332    2% /run
/dev/sda2        106377928    81302296    19625700   81% /
tmpfs              3988924          88     3988836    1% /dev/shm
tmpfs                 5120           4        5116    1% /run/lock
/dev/sda1           523248         152      523096    1% /boot/efi
tmpfs              3988924      505876     3483048   13% /tmp
/dev/sdb1       1921724676   430857688  1490850604   23% /srv/dev-disk-by-label-SSData
disks          36960024576 20394953216 16565071360   56% /disks
tmpfs               797784           0      797784    0% /run/user/501
tmpfs               797784           0      797784    0% /run/user/0

but after this mornings git pull, I get a new error with gunicorn:
Mai 12 10:21:11 openmediavault gunicorn[2679441]: [ERROR] MainProcess app.log_exception() #1744: Exception on /indi-allsky/ [GET]
                                                  Traceback (most recent call last):
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1964, in _exec_single_context
                                                      self.dialect.do_execute(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 748, in do_execute
                                                      cursor.execute(statement, parameters)
                                                  sqlite3.OperationalError: no such column: camera.hidden

                                                  The above exception was the direct cause of the following exception:

                                                  Traceback (most recent call last):
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/flask/app.py", line 2528, in wsgi_app
                                                      response = self.full_dispatch_request()
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/flask/app.py", line 1825, in full_dispatch_request
                                                      rv = self.handle_user_exception(e)
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/flask/app.py", line 1823, in full_dispatch_request
                                                      rv = self.dispatch_request()
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/flask/app.py", line 1799, in dispatch_request
                                                      return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
                                                    File "/home/admin/indi-allsky/indi_allsky/flask/misc.py", line 22, in decorated_view
                                                      return current_app.ensure_sync(func)(*args, **kwargs)
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/flask/views.py", line 104, in view
                                                      self = view.view_class(  # type: ignore[attr-defined]
                                                    File "/home/admin/indi-allsky/indi_allsky/flask/base_views.py", line 147, in __init__
                                                      self.setupSession()
                                                    File "/home/admin/indi-allsky/indi_allsky/flask/base_views.py", line 161, in setupSession
                                                      self.camera = self.getCameraById(session['camera_id'])
                                                    File "/home/admin/indi-allsky/indi_allsky/flask/base_views.py", line 92, in getCameraById
                                                      camera = IndiAllSkyDbCameraTable.query\
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 2752, in first
                                                      return self.limit(1)._iter().first()  # type: ignore
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 2855, in _iter
                                                      result: Union[ScalarResult[_T], Result[_T]] = self.session.execute(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 2229, in execute
                                                      return self._execute_internal(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 2124, in _execute_internal
                                                      result: Result[Any] = compile_state_cls.orm_execute_statement(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/orm/context.py", line 253, in orm_execute_statement
                                                      result = conn.execute(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1414, in execute
                                                      return meth(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/sql/elements.py", line 486, in _execute_on_connection
                                                      return connection._execute_clauseelement(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1638, in _execute_clauseelement
                                                      ret = self._execute_context(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1842, in _execute_context
                                                      return self._exec_single_context(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1983, in _exec_single_context
                                                      self._handle_dbapi_exception(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 2326, in _handle_dbapi_exception
                                                      raise sqlalchemy_exception.with_traceback(exc_info[2]) from e
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1964, in _exec_single_context
                                                      self.dialect.do_execute(
                                                    File "/home/admin/indi-allsky/virtualenv/indi-allsky/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 748, in do_execute
                                                      cursor.execute(statement, parameters)
                                                  sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such column: camera.hidden
                                                  [SQL: SELECT camera.id AS camera_id, camera.uuid AS camera_uuid, camera.name AS camera_name, camera.driver AS camera_driver, camera."friendlyName" AS "camera_friendlyName", camera."createDate" AS "camera_createDate", camera."connectDat>
                                                  FROM camera
                                                  WHERE camera.id = ?
                                                   LIMIT ? OFFSET ?]
                                                  [parameters: (2, 1, 0)]
                                                  (Background on this error at: https://sqlalche.me/e/20/e3q8)
Mai 12 10:21:12 openmediavault gunicorn[2679441]: [ERROR] MainProcess app.log_exception() #1744: Exception on /indi-allsky/ [GET]
                                                  Traceback (most recent call last):


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