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Step-by-step guide and ready prompt
Save Data So It Lasts
Trace one save and read operation to find where data stops, then confirm it remains after a refresh.

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Map the path from input through request, processing, storage, and response.
Set the request method, address, input, and success and error results.
Validate input and permissions on the server.
Implement writing and querying, including handling records that do not exist.
Record server errors and show recoverable feedback on the page.