Messages app not showing any conversations

Sometime between noon and 5 today all the conversations in Messages on my Pixel disappeared. I have many messages in many conversations but when I open Messages I have an introductory screen as if I never ran it before. I check recently updated apps in My Apps on the Play store and Messages is not listed. As far as I can tell, nothing changed except the messages disappeared. When I open Messages for the Web on my computer I saw conversations briefly then the page cleared and looks like...

Messages app not showing any conversations

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