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Based on the information you've provided "Unknown database 'portal_v2'", it seems that the database 'portal_v2' was already missing or inaccessible at the time the snapshot was created. Here are some suggestions and points to consider:
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Look for any logs around April 30, 2024, that might indicate the database was dropped or renamed.
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Since the export to S3 shows 0 GB of data, it's possible the snapshot itself is corrupted or empty. Try restoring to a new RDS instance to confirm.
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Look for any events around the time of the snapshot that might indicate issues with the database or instance.
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Ensure there were no storage-related issues on the original RDS instance that could have prevented proper snapshot creation.
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If available, try a point-in-time recovery to a time shortly before the snapshot was taken.
If you've exhausted these options, it might be worth contacting AWS Support for more in-depth investigation.
Also for future prevention, it's crucial to regularly verify the integrity of your backups and snapshots, and to maintain multiple backup strategies.
