All the sessions are not displayed in the history #290
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Issue #289: For the users who have long conversation histories and a lot of items in sessions table, all the records were not displayed on the UI.
Description of changes: DynamoDB query operation was not returning all the records because the total size of records was more than 1MB and in such cases, DynamoDB query operation does not handle pagination automatically.
As a fix, added code to handle the pagination based on the 'LastEvaluatedKey' returned by DynamoDB.
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