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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Set up billing alarms, it's what I do the first thing with any new AWS account (that, and setting up MFA!). Cloudformation template example here which creates a billing alarm.
You can also look into Cloud Nuke to purge all resources.
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