PostHog / PostHog/posthog

Bug report: error on saving default event table columns

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bug feature/data-management team/product-analytics team/query-performance
Dominant language
Python
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Description

Bug Description

Please describe.
User is seeing Failed to save columns to event definition on Data management > event > matching event after adding additional columns.

How to reproduce

  1. navigate to event under data management
  2. configure columns
  3. add new columns and save as default column.

Additional context

https://posthoghelp.zendesk.com/agent/tickets/36332 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/38126)

https://posthog.com/questions/unable-to-save-default-event-table-columns-failed-to-save-columns-to-event-definition-error

Debug info
- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.posthog.com/settings/project-details#variables or https://eu.posthog.com/settings/project-details#variables]
- [ ] PostHog Hobby self-hosted with `docker compose`, version/commit: [please provide]
- [ ] PostHog self-hosted with Kubernetes (deprecated, see [`Sunsetting Kubernetes support`](https://posthog.com/blog/sunsetting-helm-support-posthog)), version/commit: [please provide]

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source files, tests, or entry points are named. Start with the reproduction steps in Data management > event > matching event and review the linked support context to locate the save path; done means additional columns can be saved as the default without the reported error.

Written by the indexing model from the issue text.

Assessment

Domain
full-stack
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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