what exactly did you do ?
migrated the (data from the) old database into a new database with METRICWX as described in Tom's link in the customization guide ? (by the way, the unit system nam is METRICWX and *NOT* METRIXCW - could this be the reason for weewx not coming up ?)

Can you please set DEBUG=3 in weewx.conf, restart weewx and provide the syslog data here ....
Some information will be there ...
On 23.06.2023 08:03, Δημήτρης Βήχος wrote:
changed from US  default to METRIXCW weewx dont startup

Στις Πέμπτη 22 Ιουνίου 2023 στις 10:15:13 μ.μ. UTC+3, ο χρήστης Tom Keffer έγραψε:

    See the section /Changing the unit system in an existing database
    <https://weewx.com/docs/latest/customizing.htm#Changing_the_unit_system>/
    in the Customization Guide.

    On Wed, Jun 21, 2023 at 12:45 PM Δημήτρης Βήχος
    <[email protected]> wrote:

        finaly i did it with sqlitebrowser easily! thank you!
        is there way my data base appears values to mm and C for temp,
        instead to inches and F ?

        Στις Τετάρτη 21 Ιουνίου 2023 στις 4:17:58 μ.μ. UTC+3, ο
        χρήστης Rainer Lang έγραψε:

            At the end of the day it doesn't matter where the
            weewx.sdb is located - as long as weewx and wee_database
            via weewx.conf and sqlite3 via the path in the command
            know/are told
            where it is located.

            You can still check with sqlitebrowser what your entry in
            your database for the respective EPOCH timestamp is (see
            my earlier mail) - and you can change it manually
            (provided you start it with sudo sqlitebrowser
            /var/lib/weewx/weewx.sdb [in your case]).
            That's the pragmatic approach.

            Of course you can still try to figure out why your SQL
            command doesn't seem to have been successful.

            On 21.06.2023 13:24, Δημήτρης Βήχος wrote:
            my database is on /var/lib/weewx/weewx.sdb

            metfm@metfm:~$ ls -ail /var/lib/weewx
            σύνολο 18692
            264962 drwxr-xr-x 1 root root       18 Ιουν 21 14:20 .
               269 drwxr-xr-x 1 root root      592 Φεβ  26 18:30 ..
            270727 -rwxrwxrwx 1 root root 19140608 Ιουν 21 14:20
            weewx.sdb
            metfm@metfm:~$

            Στις Τετάρτη 21 Ιουνίου 2023 στις 11:49:35 π.μ. UTC+3, ο
            χρήστης gjr80 έγραψε:

                No. The default Debian based distro database is
                /var/lib/weewx/weewx.sdb. The archive directory is
                only used (by default) for setup.py installs.

                OP. Have you confirmed the location (and name) of
                your WeeWX database? What does the following command
                show:

                $ ls -ail /var/lib/weewx

                Gary

                On Wednesday, 21 June 2023 at 09:28:58 UTC+1
                [email protected] wrote:

                    It should be /var/lib/weewx/archive/weewx.sdb

                    Can you give us a screenshot where the weewx.sdb is??

                    Στις Τετ, 21 Ιουν 2023, 11:03 ο χρήστης Δημήτρης
                    Βήχος <[email protected]> έγραψε:

                        debian installed. also triyng with sudo
                        sqlite3 /var/lib/weewx/weewx.sdb same thing.

                        Στις Τετάρτη 21 Ιουνίου 2023 στις
                        9:55:34 π.μ. UTC+3, ο χρήστης gjr80 έγραψε:

                            Have you customised your WeeWX install?
                            You appear to be using a package install
                            so unless you have changed it your WeeWX
                            database should be in /var/lib/weewx not
                            /var/weewx.

                            Gary

                            On Wednesday, 21 June 2023 at 05:48:19
                            UTC+1 [email protected] wrote:

                                the commands with semi-colons. send
                                me (with sudo also and with suo su )

                                metfm@metfm:~$ sudo sqlite3
                                /var/weewx/weewx.sdb
                                SQLite version 3.34.1 2021-01-20 14:10:07
                                Enter ".help" for usage hints.
                                sqlite> SELECT dateTime,
                                datetime(dateTime,
                                'unixepoch','localtime'), usUnits,
                                rain FROM archive WHERE dateTime >
                                1686881600 AND dateTime <= 1686981600;
                                Error: unable to open database
                                "/var/weewx/weewx.sdb": unable to
                                open database file
                                metfm@metfm:~$

                                without semi-colons database open

                                metfm@metfm:~$ sudo sqlite3
                                /var/weewx/weewx.sdb
                                [sudo] password for metfm:
                                SQLite version 3.34.1 2021-01-20 14:10:07
                                Enter ".help" for usage hints.
                                sqlite> select datetime,
                                datetime(dateTime,
                                'unixepoch','localtime'), rain from
                                archive where dateTime > 1686881600
                                and dateTime <= 1686981600
                                   ...> update archive set rain=12.6
                                where dateTime = 1686975900
                                   ...> .quit
                                   ...>
                                metfm@metfm:~$ sudo wee_database
                                --rebuild-daily --from=2023-06-17
                                --to=2023-06-17
                                [sudo] password for metfm:
                                Using configuration file
                                /etc/weewx/weewx.conf
                                Using database binding 'wx_binding',
                                which is bound to database
                                'archive_sqlite'
                                Daily summary for 2023-06-17 will be
                                rebuilt.
                                Proceed (y/n)? y
                                Rebuilding daily summaries in
                                database 'weewx.sdb' ...
                                Processed 276 records to rebuild 1
                                daily summary in 0.12 seconds
                                Rebuild of daily summaries in
                                database 'weewx.sdb' complete
                                metfm@metfm:~$ sudo /etc/init.d/weewx
                                start
                                Starting weewx (via systemctl):
                                weewx.service.
                                metfm@metfm:~$
                                  but after restarting weewx no
                                change in database. no 12.6 plus mm
                                who i needs
                                Στις Τρίτη 20 Ιουνίου 2023 στις
                                2:10:28 μ.μ. UTC+3, ο χρήστης gjr80
                                έγραψε:

                                    At a guess I would say your
                                    sqlite3 commands were never
                                    executed due to missing
                                    semi-colons at the end of each
                                    sqlite3 command line. Your
                                    commands are basically fine, but
                                    you need to be careful with the
                                    datetime/dateTime case in the
                                    commands. No need for commits as
                                    your are not processing multiple
                                    commands as a transaction. When
                                    editing the database you do need
                                    to be mindful of your database
                                    units and make sure you use the
                                    same units in your update
                                    queries. If using sqlite command
                                    line the easiest thing to do is
                                    to look at the usUnits field.
                                    1=US customary=inches,
                                    16=Metric=cm, 17=MetricWX=mm.
                                    Whether you use sqlite3 or a gui
                                    tool like sqlitebrowser does not
                                    really matter, just check that
                                    your data was changed after you
                                    make the change and if using a
                                    gui be very careful to not leave
                                    any fields with null
                                    strings(though this is usually
                                    associate with deleting data
                                    rather than updating it). FWIW if
                                    using sqlite3 I would use this
                                    sequence of commands:

                                    $ sqlite3
                                    /home/weewx/archive/weewx.sdb
                                    sqlite> SELECT dateTime,
                                    datetime(dateTime,
                                    'unixepoch','localtime'),
                                    usUnits, rain FROM archive WHERE
                                    dateTime > 1686881600 AND
                                    dateTime <= 1686981600;
                                    sqlite> UPDATE archive SET
                                    rain=12.6 WHERE dateTime =
                                    1686975900;
                                    sqlite> SELECT dateTime,
                                    datetime(dateTime,
                                    'unixepoch','localtime'),
                                    usUnits, rain FROM archive WHERE
                                    dateTime=1686975900;
                                    sqlite> .q
                                    $ sudo wee_database
                                    --rebuild-daily --date=2023-06-17

                                    In terms of the Seasons skin your
                                    updated data may causes changes
                                    to rain plots (all except the
                                    'today' plot), the June 2023 and
                                    2023 NOAA format reports and the
                                    statistics widget/page. All
                                    should come good in time (max 24
                                    hours) provided you update your
                                    data sometime this month, but if
                                    you want to speed things up
                                    delete all your rain plots on
                                    your WeeWX machine. If you update
                                    your data in say July you will
                                    need to delete the June 2023 and
                                    2023 NOAA format reports and all
                                    subsequent NOAA format reports to
                                    force regeneration.

                                    Can't speak for any other skins.

                                    Gary
                                    On Tuesday, 20 June 2023 at
                                    07:04:56 UTC+1
                                    [email protected] wrote:

                                        here is me commands in
                                        terminal . trying to plus
                                        12.1 missing mm  in 17 july 
                                        total rainfall

                                        metfm@metfm:~$ sudo sqlite3
                                        /var/weewx/weewx.sdb
                                        [sudo] password for metfm:
                                        SQLite version 3.34.1
                                        2021-01-20 14:10:07
                                        Enter ".help" for usage hints.
                                        sqlite> select datetime,
                                        datetime(dateTime,
                                        'unixepoch','localtime'),
                                        rain from archive where
                                        dateTime > 1686881600 and
                                        dateTime <= 1686981600
                                           ...> update archive set
                                        rain=12.6 where dateTime =
                                        1686975900
                                           ...> .quit
                                           ...>
                                        metfm@metfm:~$ sudo
                                        wee_database --rebuild-daily
                                        --from=2023-06-17 --to=2023-06-17
                                        [sudo] password for metfm:
                                        Using configuration file
                                        /etc/weewx/weewx.conf
                                        Using database binding
                                        'wx_binding', which is bound
                                        to database 'archive_sqlite'
                                        Daily summary for 2023-06-17
                                        will be rebuilt.
                                        Proceed (y/n)? y
                                        Rebuilding daily summaries in
                                        database 'weewx.sdb' ...
                                        Processed 276 records to
                                        rebuild 1 daily summary in
                                        0.12 seconds
                                        Rebuild of daily summaries in
                                        database 'weewx.sdb' complete
                                        metfm@metfm:~$ sudo
                                        /etc/init.d/weewx start
                                        Starting weewx (via
                                        systemctl): weewx.service.
                                        metfm@metfm:~$

                                        something missing? something
                                        im doing wrong? the exetra mm
                                        never shows in weewx
                                        restarting and updating.



                                        Στις Σάββατο 17 Ιουνίου 2023
                                        στις 12:11:40 μ.μ. UTC+3, ο
                                        χρήστης Stefanos Kalaitzis
                                        έγραψε:

                                            First find the range of
                                            time(epoch) that you want
                                            to add the rain
                                            Enter to weeex.sdb

                                            sudo sqlite3
                                            /home/weewx/archive/weewx.sdb


                                            Then check what values
                                            your station recorded

                                             select datetime,
                                            datetime(dateTime,
                                            'unixepoch','localtime'),
                                            rain from archive where
                                            dateTime > 1686881600 and
                                            dateTime <= 1686981600;

                                            Then correct the time you
                                            want
                                            For example

                                            update archive set
                                            rain=1.0 where dateTime =
                                            1686975900;

                                            Then exit the db

                                            .quit

                                            Stop weewx

                                            After all corrections
                                            rebuild the data base for
                                            that day


                                            sudo
                                            /home/weewx/bin/wee_database
                                            --rebuild-daily
                                            --from=2023-06-17
                                            --to=2023-06-17

                                            Start weewx
                                            Thats what i am doing
                                            when i have to add some
                                            missing mm in my db



                                            Στις Σάβ, 17 Ιουν 2023,
                                            11:42 ο χρήστης Δημήτρης
                                            Βήχος
                                            <[email protected]> έγραψε:

                                                i want like to add
                                                some mm to my daily
                                                rainfall beacuse
                                                after power loss , my
                                                console (fine offset)
                                                have 10mm above the
                                                weewx after the power
                                                on again.
                                                i had loss 10mm in my
                                                daily rain.

                                                thank you!

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