Filmmaker here: You can either get signed releases from everyone or, in the case of a public location like a restaurant, you prominently post signs everywhere notifying people that by entering the location they consent to being filmed and release all rights and liability etc.

If you’re smart, you do both.

If you have an “eye-line gawker” you buy them a drink and ask them to sit at a different table.

This is standard in the US and the EU if you’re not going to buy out the bar or restaurant for the day and fill it with extras. Moldova? No idea what the process is there.