docs(postgres): create-db picks closest region by default, us-east-1 is the fallback

[nurul3101]

Summary

The npx-create-db docs page claimed "The default region is us-east-1." This is stale as of create-db v1.2.1: when --region is omitted, the CLI geolocates the caller and provisions the database in the closest available region, falling back to us-east-1 only when geolocation fails.

This PR updates the sentence to describe the geo-detection behavior with us-east-1 as the fallback.

Evidence

• packages/create-db/src/cli/commands/create.ts in prisma/create-db:

  let region: RegionId = input.region ?? "us-east-1";
  
  if (!input.region) {
    const userLocation = await detectUserLocation();
    region = getRegionClosestToLocation(userLocation) ?? region;
  }

• A live run from ap-southeast (2026-07-17) with no --region flag provisioned in ap-southeast-1.

Scope check

Swept all docs pages mentioning create-db or us-east-1 for the same stale claim; this was the only instance. Other us-east-1 mentions are verbatim sample CLI output, explicit parameters (Management API, IaC, GitHub Actions), or a different product's default (Compute).

Summary by CodeRabbit

• Documentation
  • Updated the CLI quick-start guide to clarify that the default database region is detected automatically, with a fallback to us-east-1.
  • Clarified that users can select a region manually with the --region option.

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Reviewing files that changed from the base of the PR and between 97ede65 and f1cf804.

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• apps/docs/content/docs/postgres/npx-create-db.mdx

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Walkthrough

Changes

Create-db region documentation

Layer / File(s)	Summary
Document automatic region selection apps/docs/content/docs/postgres/npx-create-db.mdx	The quick-start documentation now describes approximate-location detection, closest-region provisioning, the us-east-1 fallback, and manual selection with --region.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the doc update: default region selection now uses the closest region with us-east-1 as fallback.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Jul 17, 2026, 1:01 PM

[nurul3101]

@coderabbitai approve

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✅ Action performed

Comments resolved and changes approved.