Large backups failing with "SQLite error cannot commit - no transaction is active"

Hi,
there are other posts with similar situations, e.g.:

I’m experiencing these kind of problems too.
I’m backing up the home directories of a big server (9TB source, 8225836 files, 2368 users, in 2 weeks ~290000 new files and ~20000 modified - 320 GB SizeOfAddedFiles, 1443 GB SizeOfModifiedFiles) and, apart from issues with file names - see

it was working rather fine.

Now I get these errors:

Failed: SQLite error
cannot commit - no transaction is active
Details: Mono.Data.Sqlite.SqliteException (0x80004005): SQLite error
cannot commit - no transaction is active
at Mono.Data.Sqlite.SQLite3.Reset (Mono.Data.Sqlite.SqliteStatement stmt) [0x00084] in <978b82b4125d43bf898b4f6e1611e3cc>:0

almost every time. Due to the high number of files the DB is rather huge:

[root@host Duplicati]# ll -h
total 93G
-rw------- 1 root root 47G 12 mar 17.13 87688068698868847674.sqlite
-rw------- 1 root root 35K 8 ago 2019 backup 20190808055349.sqlite
-rw------- 1 root root 46G 11 mar 11.50 backup 87688068698868847674 20200311011107.sqlite
drwxr-xr-x 2 root root 21 11 mar 12.52 control_dir_v2
-rw------- 1 root root 135K 12 mar 17.25 Duplicati-server.sqlite
drwxr-xr-x 3 root root 59 14 ago 2019 tmp

Any ideas?