How to handle escaping quotes in mutations against SQL Datasource?

Hello,

I have a question on how to handle escaping quotes when AppSync mutation runs against Aurora Serverless datasource.

This is the example from the reference:

```
{
"version": "2018-05-29",
"statements": [
"insert into BOOKS VALUES (:AUTHOR, :TITLE, :ISBN13)",
"select * from BOOKS WHERE isbn13 = :ISBN13"
],
"variableMap": {
":AUTHOR": "$ctx.args.newBook.author",
":TITLE": "$ctx.args.newBook.title",
":ISBN13": "$ctx.args.newBook.isbn13"
}
}
```
However if input parameters `author` or `title` contains a signle quote, this will break VTL.

What is the best way to work around this?

Start with the AppSync mutation reference example and the Aurora Serverless datasource context described in the issue, focusing on the variableMap and VTL input handling. Done would be a clear, documented way to handle quote-containing author or title values without breaking the mutation.

Written by the indexing model from the issue text.