OK find anyplace where King Schumer or anyone else in the Democratic Party made any proposal at all, before today.

You're the one who said he caved. You're the one who started a new thread where you calculated a percentage - to four decimal places - detailing precisely the degree to which he caved. That said that this was Schumer's demand and provided an exact cost.

I merely assumed that this meant that you actually knew what Schumer demanded. That he had made a prior concrete offer that he had "caved" from. After all, it's your thread title.

The Democratic party has made it clear from the beginning that their primary objective was to force the GOP to revised the CR to include an extension of the ACA subsidies. They have been communicating that eight ways from Sunday in their public statements and (presumably) to Congressional leadership as their starting position for negotiations. Schumer's proposal today is for (checks notes) an extension of the ACA subsidies...which is what they've been identifying as their primary ask the entire time.

So I don't think it's too much to ask of you if you are asserting that this means he "caved" to provide some basis for that claim.