The trailing whitespace has been removed for consistency and readability. The unused import of `DEFAULT_CONNECTION_STRING` from `langchain.memory.chat_message_histories.postgres` has been removed. The `PostgresChatMessageHistoryFrontendNode` now has a default value for the `connection_string` field, which is set to `DEFAULT_CONNECTION_STRING`. This ensures that the field has a default value when creating instances of the class.
🔧 chore(memories.py): remove trailing whitespace and unused import
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