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Update from code changes: refresh preview expiration on start-preview re-run #981

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Jul 13, 2026
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Update from code changes: refresh preview expiration on start-preview re-run #981

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17 changes: 17 additions & 0 deletions guides/developer/preview-projects.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,23 @@ lightdash preview --name "PR: Add Revenue Metric"
lightdash preview --name "Long-lived preview" --expires-in 240
```

### Refreshing expiration on an existing preview

Re-running `lightdash start-preview` with the same `--name` as an existing preview refreshes its expiration. `expires_at` is recomputed from the moment of the re-run using the same rules as a fresh preview — bounded by the upstream project's default and maximum.

Omitting `--expires-in` on a re-run resets the expiration to the upstream project's default, since a re-run is treated as confirmation that the preview is still in use.

```bash
# First run: creates the preview and sets expires_at based on the upstream default
lightdash start-preview --name "ecom-shop-analytics"

# Later re-run without --expires-in: resets expires_at to the upstream default from now
lightdash start-preview --name "ecom-shop-analytics"

# Re-run with an explicit value: sets expires_at to 72 hours from now (capped at the maximum)
lightdash start-preview --name "ecom-shop-analytics" --expires-in 72
```

## Deleting a Preview Project

Preview projects created using any method can be deleted in the [Lightdash App](/guides/developer/preview-projects#lightdash-app-2).
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4 changes: 4 additions & 0 deletions references/lightdash-cli.mdx
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Expand Up @@ -391,6 +391,10 @@ All standard [dbt options](#dbt-options) work with `lightdash start-preview`.
- (default: false)
- Snowflake only. Disable converting timestamps to UTC. Applied and persisted when creating the preview project. When updating an existing preview, the flag is ignored with a warning and the saved project setting is used instead.

<Info>
**Re-running `lightdash start-preview` refreshes the expiration.** If the named preview already exists, `expires_at` is recomputed from the moment of the re-run using the same rules as a fresh preview (bounded by the upstream project's default and maximum). Omitting `--expires-in` on a re-run resets the expiration to the upstream project's default — a re-run is treated as confirmation that the preview is still in use.
</Info>


### `lightdash stop-preview`

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