sequelize/sequelize — pull request #673 by sevastos (2013-06-04 03:22:48+00:00)
Title: Value omittion of autoincremental numerics

For a integer column with autoincrement the value can be omitted while supplying values for other columns.

However that only worked for integers, not for bigints and so you were getting error:
`error: null value in column "id" violates not-null constraint`

It should be fixed and a test was added to cover this case.