Dynamodb support - #812
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Dynamodb support#812
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- DynamoDB has no SQL engine, so reads become paginated Scans driven by a JSON scan descriptor (filter/fields/limit) and writes become BatchWriteItem puts that upsert by primary key. - Tables cannot exist without a key: `primary_key` and unique keys are honored, and a `_sling_id` column is added when a stream declares none, so repeated data values cannot collapse rows on write. - delete_missing soft/hard are supported by parsing the rendered update/delete statements and resolving the `not exists` join against the stream's temp keys, keeping rows the stream still holds. - Credentials come from the AWS credential chain, region from the URL host or env, and a custom `endpoint` supports DynamoDB Local. - Registered in type, template, URL and direct-write plumbing, with unit tests, a CLI suite entry and an end-to-end pipeline.
…o/dynamodb-support
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