15:[[48060054,{"by":"mittermayr","descendants":342,"id":48060054,"kids":[48065541,48061235,48066825,48067463,48060816,48063144,48061573,48065977,48060233,48065664,48066657,48164609,48061206,48065477,48063764,48060862,48060118,48060510,48066897,48068031,48068671,48061021,48072985,48069406,48065405,48076222,48065805,48066611,48060305,48062348,48074130,48071929,48073874,48061239,48143098,48078121,48060366,48066467,48065750,48069852,48071907,48067033,48060494,48061231,48076074,48064439,48072394,48068953,48066644,48066357,48068343,48076649,48066376,48071584,48110342,48069841,48066224,48061401,48071571,48094835,48075843,48061142,48076192,48079163,48075240,48067693,48061175,48067538,48067848,48171679,48135694,48067059,48106672,48060270,48140548,48060100,48066661,48061397,48068520],"score":476,"text":"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-bed6-8ca8fc9386cd

We're using this:\nhttps://www.npmjs.com/package/uuid

I 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...","time":1778227034,"title":"Ask HN: We just had an actual UUID v4 collision...","type":"story"}],[47975069,{"by":"rickcarlino","descendants":51,"id":47975069,"kids":[48009559,48004522,48006019,48007348,48004712,48003740,48004756,48004797,48004441,48008259,48009062,48004121,48009014,48005473],"score":91,"time":1777644998,"title":"K3sup – bootstrap K3s over SSH in < 60s","type":"story","url":"https://github.com/alexellis/k3sup"}],[47852177,{"by":"Trollmann","descendants":769,"id":47852177,"kids":[47852708,47853833,47862177,47852531,47853052,47853331,47852620,47853114,47852514,47859271,47855419,47853872,47860624,47853861,47852793,47852663,47852544,47857206,47852452,47863500,47860265,47853593,47853814,47856999,47855189,47853061,47854071,47858304,47859939,47852767,47854186,47854008,47853499,47854351,47853393,47853634,47852645,47852528,47855705,47862407,47853517,47852684,47852509,47853467,47854347,47866264,47853446,47853495,47853778,47857267,47859457,47860094,47852675,47920389,47859145,47855377,47853267,47905360,47859236,47855497,47852927,47855292,47853905,47861679,47854384,47853125,47853253,47859810,47853259,47855945,47854029,47862232,47856067,47861199,47860037,47853070,47858348,47853556,47858296,47854451,47864645,47858827,47854817,47853926,47854070,47852876,47853572,47854674,47856618,47854349,47858131,47852640,47852962,47855651,47861822,47863673,47860453,47860144,47853672,47853971,47860065,47857543,47860975,47854738,47856145,47854397,47853025,47856554,47858015,47875617,47857856,47853091,47854395,47857101,47853489,47854495,47859899,47852805,47854149,47858835,47854803,47856681,47859171,47859507,47855949,47860277,47853822,47862350,47852934,47853223,47858308,47855002,47853671,47855200,47936030,47852422,47854707,47860621],"score":1479,"time":1776794434,"title":"Framework Laptop 13 Pro","type":"story","url":"https://frame.work/laptop13pro"}],[47729350,{"by":"g0xA52A2A","descendants":127,"id":47729350,"kids":[47758959,47759543,47762946,47759169,47762522,47758261,47762128,47760164,47758693,47758444,47759746,47760702,47732992,47757977,47762789,47760158,47764103,47767277,47760418,47764362,47761590,47761167,47760425,47757975,47764267,47758377,47758169,47764109,47759999,47760083,47759739,47760843,47758958,47764897,47784288,47760889,47758241,47759455,47758412,47758758,47787897,47759545,47783617,47761162,47761739,47736434,47762366,47771106,47757973,47759915,47761204],"score":247,"time":1775903775,"title":"I just want simple S3","type":"story","url":"https://blog.feld.me/posts/2026/04/i-just-want-simple-s3/"}],[47751029,{"by":"surprisetalk","descendants":185,"id":47751029,"kids":[47751393,47751418,47752262,47752427,47752799,47751308,47751369,47751796,47752035,47751438,47751407,47752529,47751665,47751398,47752280,47752848,47752723,47752913,47752807,47752428,47751561,47751925,47751330,47752916,47751801,47751998,47752180,47753145,47760309,47753335,47754354,47753086,47751952,47752934,47755707,47751217,47752403,47752398,47751554,47751581,47752161,47752272,47751547,47753308,47751855,47751491,47751752,47752129,47751731,47751269,47751992,47751382],"score":198,"time":1776083375,"title":"I went to America's worst national parks so you don't have to","type":"story","url":"https://substack.com/home/post/p-193626949"}],[47626598,{"by":"luca-ctx","descendants":52,"id":47626598,"kids":[47627620,47628051,47626629,47627203,47629298,47627319,47627139,47626999,47626874,47646121,47627352,47627861,47627351,47627953,47628065,47627365,47627491,47638660,47627537,47627039,47627136],"score":53,"time":1775223902,"title":"Show HN: ctx – an Agentic Development Environment (ADE)","type":"story","url":"https://ctx.rs"}],[46460831,{"by":"teleforce","descendants":4,"id":46460831,"kids":[46461247,46462175],"score":7,"time":1767321922,"title":"DENT: A network operating system (NOS) for everyone else","type":"story","url":"https://dent.dev/"}],[46336947,{"by":"pavel_lishin","descendants":396,"id":46336947,"kids":[46337844,46337330,46337101,46337295,46346466,46337156,46337141,46345032,46337565,46339101,46337671,46337836,46337048,46346574,46337680,46337005,46341812,46340713,46339902,46340746,46344059,46337199,46345154,46337911,46337602,46337975,46342490,46342627,46345877,46337032,46340596,46338250,46340955,46343763,46343902,46339695,46341534,46341341,46337994,46338977,46342717,46337715,46342823,46343674,46339196,46338403,46351266,46338988,46337469,46337643,46338566,46337650,46347759,46337453,46337297,46344771,46342041,46343416,46338791,46337908,46337567,46339380,46339275,46349249,46337976,46337914,46344161,46349078,46337448,46339727,46337613,46337376,46344508,46338427,46337051,46346091,46337302,46337880,46338338,46337042],"score":683,"time":1766245395,"title":"Go ahead, self-host Postgres","type":"story","url":"https://pierce.dev/notes/go-ahead-self-host-postgres#user-content-fn-1"}],[46291156,{"by":"kevin-david","descendants":819,"id":46291156,"kids":[46295141,46292376,46291634,46291358,46295235,46291992,46291939,46292609,46292432,46292459,46293683,46291506,46291743,46293823,46293680,46292664,46294785,46292035,46296864,46294743,46292312,46291863,46293284,46292368,46293389,46291564,46294299,46291617,46292516,46293075,46292045,46294130,46293964,46291805,46292219,46295282,46292193,46291768,46291646,46291568,46292725,46291681,46291759,46292386,46292447,46294855,46292201,46292829,46291418,46294525,46292583,46292252,46292024,46293555,46292554,46292734,46293491,46299595,46294133,46292188,46294143,46293406,46292463,46298866,46292754,46296849,46293249,46292678,46294839,46296579,46294197,46296964,46298249,46300149,46294919,46291795,46296656,46297154,46292600,46298605,46292726,46293318,46292123,46291910,46294767,46296940,46295168,46292824,46294575,46301369,46292150,46292875,46292288,46294106,46300180,46293432,46294153,46294560,46292071,46301248,46292375,46301563,46295945,46292269,46291755,46295150,46292751,46292229,46295384,46297791,46296225,46292536,46305331,46291929,46297647,46291884,46297949,46292110,46298636,46300170,46295013,46292222,46292285,46298352,46292611,46300087,46291843,46291679,46298330,46291775,46292969,46295946,46291415,46292551,46298166,46296605,46292614,46295499,46291901,46295498,46295694,46300366,46292278,46292087,46292522,46301236,46292675,46294160,46299645,46292907,46292633,46299069,46293093,46298337,46292891,46291867,46293427,46298069,46295287,46299084,46294009,46298549,46292523,46291810,46295907,46292732,46292203],"score":802,"time":1765905122,"title":"Pricing Changes for GitHub Actions","type":"story","url":"https://resources.github.com/actions/2026-pricing-changes-for-github-actions/"}]]

user:	nhumrich
created:	April 19, 2015
karma:	1.8k
about:	@nhumrich [ my public key: https://keybase.io/nhumrich; my proof: https://keybase.io/nhumrich/sigs/IYE1k9gKJH3d5VAUTw6pMBufyQIVsGQ62UeqYINWi9Y ]