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Looks like Firefox locks the databases and prevents searching, we create a copy of the databases and searches the copies instead.

Please add support for reading the AWS_REGION environment variable as well

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Currently, the code only looks for SERVICE_REGION and fails if it is not found, in AWS Lambda, the environment variable 'AWS_REGION' is prepopulated by default and can be used. https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html