Content Server DB Management

Analyze the use of the DB management in the Content Server.
The current implementation doesn't make use of workers and makes some not idea uses of transaction leading to some errors like Tx timeout while syncing from scratch

Locate the Content Server's database-management code and the sync-from-scratch path; the issue does not name specific files or tests. First trace how workers and transactions are currently used and reproduce the transaction-timeout error if possible. Done means the database sync uses an agreed worker and transaction strategy without the reported timeout errors.

Written by the indexing model from the issue text.