I'm interested in storing user access events and interactions with the product I'm building. Accurac

I'm interested in storing user access events and interactions with the product I'm building. Accuracy is more important than access speed (i.e. it's ok if there is a delay seeing events and counts). However, based on the docs for analytics engine, if I'm understanding correctly, all data is sampled and there is no guarantee precise values? Examples of the two use cases I'm interested in are:

  1. Jon smith watched a video on the site for 10 minutes of total play time. On average Jon smith watches about 15 minutes for all videos jon watches.
  2. Events about jon smith, e.g. logged in, changed password, bought ticket, logged back in 3 days later
Based on my reading it seems like for case 1, I would receive back a fairly close approximation but no gurantee it is exact. For case 2, I could end up missing events depending on how much data was either stored or read back. Is that accurate?
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