• Due to referential integrity, you can get into a position where data is inserted into the source during a sync, which may cause errors if a parent table has already been synchronized, but a downstream table now has a record that exists, but the destination does not have its parent record, leading to a failure.
• Other cases can simply be bad data here that should just be skipped.
• Folks have connected to a read replica of prod which can cause a lag

_{From SyncLinear.com | NEOS-1251}