Persistant group items not working?

Add-ons Persistence Services
1

not sure if there is another thing I have missed , I have created a persistence group in my config
I don’t see entry in my items table even after restart of openhab.

Q2: if I using in multiple items file do I put Group in all files or just one?

jdbc.persist
dbChangeStart: strategy = everyChange, restoreOnStartup

items file
Group computers
Group dbChangeStart
Switch work432070L (computers,dbChangeStart) { channel=“network:pingdevice:work432070L:online” }

2

But

will persist only the state of the Group.
You Group doesn’t appear to have any state defined to be recorded.
Did you mean to use
dbChangeStart*
to record all member states, as defined in docs?

Create each Item only once. Groups are Items too.

3

hmm I’m still not getting it or something is missing

item:
Switch work432070L (computers, dbChange) { channel=“network:pingdevice:work432070L:online” }

persistance:
dbChange* : strategy = everyChange

I can see the state change but no output to database.

2021-10-16 08:47:10.197 [INFO ] [openhab.event.ItemUpdatedEvent      ] - Item 'work432070L' has been updated.
2021-10-16 08:47:10.213 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'work432070L' changed from NULL to ON

footnote: changed refreshInterval to 1 min (from 1hour) and mysteriously item appeared in DB

Thing network:pingdevice:work432070L [ hostname=“192.168.0.30”, refreshInterval=60000]