Today I tackled one of the most common issues in Serverless: How do you track continuous user state without adding database bloat?
My goal was to add a "Savings Streak" tracker to my Fintech app. If you don't spend on junk food or unnecessary cloud resources for a day, your streak goes up.
How I built it:
I used DynamoDB Single Table Design. My transaction table now holds a generic metadata item.
The Read: When Lambda wakes up, it fetches PROFILE#user_id to get the current streak count.
The Evaluation: The Python script calculates yesterday's total spend.
The AI Twist: I passed the current_streak variable directly into my Amazon Bedrock (Nova Micro) prompt. Now, if the user breaks a 10-day streak, the AI specifically roasts them for throwing away a week and a half of progress.
The Write: Lambda updates the current_streak integer back to DynamoDB.
By handling this in the backend during the automated EventBridge cron job, the data is completely secure from client-side manipulation. Tomorrow, we build the React UI components to visualize this!
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