Ignition 7.6 store and forward stuck

Hello,

We have a system where the store and forward system is stuck - not forwarding history to the database:

The datacache folder has 7gb. I know I can delete the cache folder, however I would like to recover the history stored there.

Also, I can not store any new history. It goes directly to quarantine.

I tried opening the sqlite database but I don’t know the password.

Do you have any suggestions?

Thanks.

Edit:
The error from wrapper.log:

INFO   | jvm 1    | 2020/05/20 10:08:56 | ERROR [HSQLDataStore                 ] [10:08:55,954]: Error deserializing data from data store.
INFO   | jvm 1    | 2020/05/20 10:08:56 | java.lang.IllegalStateException: Cannot create ModuleObjectInputStream with a null module manager.
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.cluster.ModuleObjectInputStream.<init>(ModuleObjectInputStream.java:30)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.cluster.ClusterUtil.deserializeObject(ClusterUtil.java:59)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.cluster.ClusterUtil.deserializeObject(ClusterUtil.java:52)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.stores.AbstractDatasourceStore.deserializeObject(AbstractDatasourceStore.java:495)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.stores.AbstractDatasourceStore.loadTransactions(AbstractDatasourceStore.java:553)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.stores.AbstractDatasourceStore.syncdTakeNext(AbstractDatasourceStore.java:510)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.stores.AbstractStore.takeNext(AbstractStore.java:200)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.stores.MultiStageStore.syncdTakeNext(MultiStageStore.java:170)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.stores.AbstractStore.takeNext(AbstractStore.java:200)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.forwarders.ForwarderThread.synchedTakeNext(ForwarderThread.java:196)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.forwarders.RedundancyAwareForwarder.synchedTakeNext(RedundancyAwareForwarder.java:68)
INFO   | jvm 1    | 2020/05/20 10:08:56 | 	at com.inductiveautomation.ignition.gateway.history.forwarders.ForwarderThread.run(ForwarderThread.java:128)


What backend you are using? Can you verify that service is running? You may check that in services, if your server is on windows platform.