Create a new snapshot of a database

Captures a snapshot of the database and returns a signed download URL valid for 30 days.

The snapshot has a soft deadline: if it finishes within ~90s the response carries the signed URL. Otherwise the route answers 202 SNAPSHOT_PROCESSING while it keeps generating in the background — expected for large databases, not a failure. Poll the snapshot listing (GET /v2/databases/:databaseId/snapshots) ~2min later instead of re-posting.

Rate limits: 1 snapshot per 5s per user, 1 snapshot per 3min per database, and the plan's daily snapshot quota per user.