--- title: Using UUIDv7 with Ecto and PostgreSQL | daily.dev description: PostgreSQL 18 introduces a native `uuidv7()` function, enabling time-sortable UUIDs as primary keys without extensions. Using UUIDv7 with Ecto requires three... canonical: https://daily.dev/posts/3ebhypmz4 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Using UUIDv7 with Ecto and PostgreSQL | daily.dev og:description: PostgreSQL 18 introduces a native `uuidv7()` function, enabling time-sortable UUIDs as primary keys without extensions. Using UUIDv7 with Ecto requires three... og:url: https://daily.dev/posts/3ebhypmz4 og:image: https://api.daily.dev/og/posts/3EbHYPMZ4.png og:image:alt: Post cover image og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Using UUIDv7 with Ecto and PostgreSQL **[Elixir Developers](https://daily.dev/sources/elixirdevs)** · [@itzmidinesh](https://daily.dev/itzmidinesh) · 0 upvotes · 0 comments ## Summary PostgreSQL 18 introduces a native `uuidv7()` function, enabling time-sortable UUIDs as primary keys without extensions. Using UUIDv7 with Ecto requires three specific changes: setting `primary_key: false` on the table and manually adding an `id` column with `default: fragment("uuidv7()")` in the migration, then disabling `autogenerate` on the schema's `@primary_key` attribute (so Ecto doesn't override the DB default with a UUIDv4), and finally enabling `read_after_writes: true` so the generated UUID is returned and populated on the struct after insert. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 1 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments - [CNCF Unveils Schedule for KubeCon \+ CloudNativeCon Europe 2026](https://daily.dev/posts/cncf-unveils-schedule-for-kubecon-cloudnativecon-europe-2026-ikhcoa5cb) · CNCF · 2 upvotes · 0 comments - [CNCF Debuts KubeCon \+ CloudNativeCon Japan 2026 Schedule](https://daily.dev/posts/cncf-debuts-kubecon-cloudnativecon-japan-2026-schedule-xp5pyudub) · CNCF · 1 upvotes · 0 comments --- Tags: [#postgresql](https://daily.dev/tags/postgresql), [#elixir](https://daily.dev/tags/elixir), [#ecto](https://daily.dev/tags/ecto) [View this post on daily.dev](https://daily.dev/posts/3ebhypmz4) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/3ebhypmz4","headline":"Using UUIDv7 with Ecto and PostgreSQL","text":"Shared: Using UUIDv7 with Ecto and PostgreSQL","url":"https://daily.dev/posts/3ebhypmz4","datePublished":"2026-02-23T20:46:48.438Z","dateModified":"2026-02-23T20:47:26.479Z","author":{"@type":"Person","name":"Dinesh","url":"https://daily.dev/itzmidinesh","image":"https://avatars.githubusercontent.com/u/5523347?v=4","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":2195}},"image":"https://media.daily.dev/image/upload/s--P4t4XyoV--/f_auto/v1722860399/public/Placeholder%2001","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/XNTE3nFwo"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/squads/elixirdevs","name":"Elixir Developers"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Elixir Developers","item":"https://daily.dev/squads/elixirdevs"},{"@type":"ListItem","position":3,"name":"Using UUIDv7 with Ecto and PostgreSQL"}]} ```