Returns the raw readings behind a post's numbers, oldest first.

Each sample is one analytics sync: the views and engagement as the platform reported them at syncedAt. Zernio only stores what it fetched from the platform, so nothing here was self-reported.

Null values

• shares and saves are null on platforms that do not return that counter, which is different from a real zero.
• watchSeconds and completionRate are null when the platform gives no watch signal.