Attempt at \a[nodejs/sequelize/raw/upsert.js]:
* https://stackoverflow.com/questions/48816629/on-conflict-do-nothing-in-postgres-with-a-not-null-constraint OP unable to provide a minimal exampe, but it is likely the problem
* https://dba.stackexchange.com/questions/292428/postgresql-upsert-issue-with-not-null-columns

Related on more complex constraints:
* https://dba.stackexchange.com/questions/175182/on-conflict-on-two-columns-where-one-can-be-null
* https://dba.stackexchange.com/questions/292428/postgresql-upsert-issue-with-not-null-columns


Upsert with not null column

ID: upsert-with-not-null-column