We just had an actual UUID v4 collision...
I know what you're thinking... and I still can't believe it, but...This morning, our database flagged a duplicate UUID (v4). I checked, thinking it may have been a double-insert bug or something, but no.The original UUID was from a record added in 2025 (about a year ago), and today the system inserted a new document with a fresh UUIDv4 and it came up with the exact same one:b6133fd6-70fe-4fe3-bed6-8ca8fc9386cdWe're using this: https://www.npmjs.com/package/uuidI thought this is technically impossible, and it will never happen, and since we're not modifying the UUIDs in any way, I really wonder how that.... is possible!? We're literally only calling:import { v4 as uuidv4 } from "uuid";const document_id = uuidv4();... and then insert into the database, that's it.Additionally, the database only has about 15.000 records, and now one collision. Statistically... impossible.Has that ever happened to anyone?! What in the...
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An article recounting a rare UUID v4 collision event in a small database.
The pain
The gap
Build angle
Strengths
- Highlights a surprising real-world edge case that challenges common assumptions.
- Could spark awareness about UUID collision risks in software engineering.
- Leverages a widely used open-source library and a common developer pain point.
Risks
- UUID v4 collisions are statistically negligible, so market demand for solutions may be very low.
- The idea is more of a cautionary tale than a scalable business opportunity.
- Difficult to monetize or build a sustainable product around a rare event.
- May be perceived as a niche or academic curiosity rather than a pressing problem.
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