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Can someone please elaborate on how this differs from Firebird, which also seems to be a lightweight VM that can spin up very fast

Are you thinking about Firecracker (https://firecracker-microvm.github.io/). If so, one of our colleagues (I work for Fermyon) did touch upon this in a talk at Cloud Native WasmDay recently: https://youtu.be/-cJ_Cn_mgqI?list=PLj6h78yzYM2Pdj8vnO0wfFyKc...

This talk is actually a really nice compendium to the blog post.

Can you please provide more information? I only found Firebird SQL.