The original design at tasksinabox.com was one DB per tenant. This became untenable due mainly to cost after the business gained traction. After experimenting w

The original design at tasksinabox.com was one DB per tenant. This became untenable due mainly to cost after the business gained traction. After experimenting with a single DB we settled on a sharded approach. This allows us to have different parameterization as needed in terms of performance, release group, availability, location etc.) . A shard can host thousands of customers or just a single one. I think this is for typical B2B SaaS operations the architectural sweet spot.