I have a few questions regarding the error:

Unable to write relationships: ERROR: Current transaction is aborted, commands ignored until end of transaction block

1. Does this only occur if parallel WriteRelationships are impacting the same relationship or can this happen even if requests are made sequentially, but contain multiple updates to the same relationship? 2. What are the best strategies for mitigating this error? 3. Does it impact all SQL datastores or just postgres?