How do the authorities know whether someone reaches a country?

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The formal entering of the Schengen area will be in your first airport within the area, as usual.
But special rules will allow Poland to check and record your details.

The airline may well give details, they usually do for some countries, although not within Schengen as far as I know.

If countries feel there is a need, COVID 19 rules do allow other measures like quarantaine in apointed locations.

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