I have similar opinion to some other comments. Some Azure services - like Application Insights - I absolutely loved, some I hated, CosmosDB, being the latter.

I have similar opinion to some other comments. Some Azure services - like Application Insights - I absolutely loved, some I hated, CosmosDB, being the latter. They needed years to finally introduce PATCH in CosmosDB, Request Units feel like they're obscure on purpose to hide insane cost of using this storage, being able to use Stored Procedures only on one Partition Key(while /id is being the default...), requests would often fail with 429 Too Many Requests when the container was set to Autoscale with obscene limits that were never hit. Just setup Marten with Postgres and get it over with for fraction of the cost.