postgresql to s3 export doesn't work anymore

Question

We have RDS instance that works on 14.10 version. We used it to export data to s3 bucket with help of https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/postgresql-s3-export.html .
We migrated to eu-central-2 region in March. And everything worked fine after it.
But recently we started to get an error from the api:
```
[2024-02-14 13:36:02] [58000] ERROR: unknown error occurred
[2024-02-14 13:36:02] Detail: Amazon S3 client returned 'basic_string::_M_construct null not valid'.
[2024-02-14 13:36:02] Where: SQL function "query_export_to_s3" statement 1
```
Noone changed anyting in setup. We noticed that we use null in the region and tried to change it to eu-central-2, but we got a new error:
```
[2024-02-14 13:41:14] [22023] ERROR: invalid value for "region" parameter
[2024-02-14 13:41:14] Where: SQL function "query_export_to_s3" statement 1
```
We also tried other regions and got:
```
[2024-02-14 12:55:06] [58000] ERROR: unknown error occurred
[2024-02-14 12:55:06] Detail: Amazon S3 client returned 'cross region export is not supported at this time'.
```

It's example of the query we used:

```
SELECT * from aws_s3.query_export_to_s3(
      'SELECT ''Hello World'' AS hello;',
      ('test-bucket', 'test-export.csv', 'eu-central-2')::aws_commons._s3_uri_1,
      'format csv'
)
```

Did something change recently and how can we make it work again?

Answer

Hi,  currently the AWS Region of the S3 Bucket must be the same as the region of the exporting DB instance. Looks like you've migrated the db to eu-central-2 but the bucket is still the same (assuming in the previous region only). 
Can you try by using the bucket in the same region as your db instances (eu-central-2 in this case).

Reference: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/postgresql-s3-export.html#postgresql-s3-export-file

postgresql to s3 export doesn't work anymore

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