Hello,
I am currently running weewx 4.8 on a raspberry pi with a remote mysql 
database server.
It is running smoothly except I need to change my database server and I 
can't do it.

Here is what I did:
- Stopped weewx
- Dumped all mysql database from server using mysqldump
- Cloned users settings from old database server to the new server
- Imported all data and structure from the dump I made previously
- Changed server address in the weewx.conf (all other settings keept 
uncahnged).
- Tried to start weewx and got:
Oct 11 15:17:45 meteo.botrange systemd[1]: Starting LSB: weewx weather 
system...
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
Initializing weewx version 4.8.0
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
Using Python 3.7.3 (default, Jul 25 2020, 13:03:44)
                                              [GCC 8.3.0]
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
Platform Linux-5.10.17+-armv6l-with-debian-10.8
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
Locale is 'en_GB.UTF-8'
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
Using configuration file /home/weewx/weewx.conf
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
Debug is 0
Oct 11 15:17:48 meteo.botrange weewxd[24921]: weewx[24921] INFO __main__: 
PID file is /var/run/weewx.pid
Oct 11 15:17:48 meteo.botrange weewxd[24925]: weewx[24925] INFO 
weewx.engine: Loading station type Vantage (weewx.drivers.vantage)
Oct 11 15:17:48 meteo.botrange weewx[24911]: Starting weewx weather system: 
weewx.
Oct 11 15:17:48 meteo.botrange systemd[1]: Started LSB: weewx weather 
system.
Oct 11 15:17:49 meteo.botrange weewxd[24925]: weewx[24925] INFO 
weewx.engine: StdConvert target unit is 0x10
Oct 11 15:17:49 meteo.botrange weewxd[24925]: weewx[24925] INFO 
weewx.wxservices: StdWXCalculate will use data binding wx_binding
Oct 11 15:17:49 meteo.botrange sudo[24899]: pam_unix(sudo:session): session 
closed for user root
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__: Caught unrecoverable exception:
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****  [<class 'decimal.ConversionSyntax'>]
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****  Traceback (most recent call last):
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewxd", line 147, in main
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      engine = weewx.engine.StdEngine(config_dict)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/engine.py", line 93, in 
__init__
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      self.loadServices(config_dict)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/engine.py", line 161, in 
loadServices
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      obj = weeutil.weeutil.get_object(svc)(self, 
config_dict)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/wxservices.py", line 105, 
in __init__
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      initialize=True)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/manager.py", line 597, in 
get_manager
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      self.manager_cache[data_binding] = 
open_manager(manager_dict, initialize)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/manager.py", line 747, in 
open_manager
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      manager_dict['schema'])
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/manager.py", line 164, in 
open_with_create
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      dbmanager = cls(connection, table_name=table_name, 
schema=schema)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/manager.py", line 884, in 
__init__
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      super(DaySummaryManager, self).__init__(connection, 
table_name, schema)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weewx/manager.py", line 83, in 
__init__
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      self.sqlkeys = 
self.connection.columnsOf(self.table_name)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weedb/mysql.py", line 54, in 
guarded_fn
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      return fn(*args, **kwargs)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weedb/mysql.py", line 210, in 
columnsOf
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      column_list = [row[1] for row in 
self.genSchemaOf(table)]
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weedb/mysql.py", line 210, in 
<listcomp>
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      column_list = [row[1] for row in 
self.genSchemaOf(table)]
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File "/home/weewx/bin/weedb/mysql.py", line 183, in 
genSchemaOf
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      cursor.execute("""SHOW COLUMNS IN %s;""" % table)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File 
"/usr/lib/python3/dist-packages/MySQLdb/cursors.py", line 250, in execute
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      self.errorhandler(self, exc, value)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File 
"/usr/lib/python3/dist-packages/MySQLdb/connections.py", line 50, in 
defaulterrorhandler
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      raise errorvalue
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File 
"/usr/lib/python3/dist-packages/MySQLdb/cursors.py", line 247, in execute
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      res = self._query(query)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File 
"/usr/lib/python3/dist-packages/MySQLdb/cursors.py", line 412, in _query
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      self._post_get_result()
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File 
"/usr/lib/python3/dist-packages/MySQLdb/cursors.py", line 416, in 
_post_get_result
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      self._rows = self._fetch_row(0)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****    File 
"/usr/lib/python3/dist-packages/MySQLdb/cursors.py", line 384, in _fetch_row
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****      return self._result.fetch_row(size, 
self._fetch_type)
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****  decimal.InvalidOperation: [<class 
'decimal.ConversionSyntax'>]
Oct 11 15:17:50 meteo.botrange weewxd[24925]: weewx[24925] CRITICAL 
__main__:     ****  Exiting.

When I roll back to the other server (change server address) all works good.
How should I fix those errors?
Old sql server:  10.3.39-MariaDB-0+deb10u2 - Debian 10
New sql server:  11.8.3-MariaDB-0+deb13u1 from Debia

Thanks

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