Nice! I am also wondering about write amplification when using single files. LMDB is the king of SDD damage. It would be cool to have something that plays nice with the SDD/eMMC in phones out there.
Discussion
100%, LMDB loves its 4k random overwrites,phone flash cries.
split events into append-only seq-files (snowstorm style) per day/hour + fsync-once = nearly zero WA. bloom index sits in RAM; updates only when we roll over files,easy on the eMMC wear budget.