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Good point, this product does make this approach far more palatable.

Curious if the sharding strategy that you were shifting to was company-based, as is implemented in this case?

Yup! I lean towards a tenant ID approach. I ALWAYS use a library that enforces these tenant checks on queries. Ruby (https://github.com/citusdata/activerecord-multi-tenant) and Elixir (I wrote https://github.com/sb8244/ecto_tenancy_enforcer) are the ones I have experience with.