One chunk of a session recording — a few seconds of one page view: where the pointer went, what was clicked and hovered, how the page scrolled.
Written by PhoenixKitWebAnalytics.Recordings from what the optional
client script sends while recording is on; a page view is the chunks
sharing a page_key, in seq order. frames is
%{"v" => 1, "f" => [[ms_since_page_start, type, ...], ...]} — the format
is documented in PhoenixKitWebAnalytics.Recordings.