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This pull request modifies the messageSchema in the code by adding a new optional property called parentId of type Number. This new property allows messages to have a parent ID, enabling the implementation of a parent-child relationship for message replies. The modified messageSchema now includes the following properties:
id of type Number
text of type String
createdAt of type Number
userId of type Number
user referencing the userSchema
parentId of type Optional(Number)
By adding the parentId property to the schema, this pull request allows for the association of parent messages with their corresponding replies.