Every figure is in crvUSD, this market's borrowed token: the market's AMM prices WBTC in crvUSD, and that is the price it lends and liquidates against. Each WBTC flow is converted at that price at its block, so the collateral's last line, Market move since the last event, is the change in the price since each flow.

Each event states the position after it and its amounts, so the interest between two events is exact to the base unit: the debt just before an event less the debt the event before left is Interest accrued. Between events the debt grows at the rate between those two events; after the last, at the rate that meets today's debt from the live read.

The collateral sits in the AMM's bands. While the price is inside them the AMM sells WBTC for crvUSD as the price falls and buys it back as it rises (soft liquidation). No event records those trades: the collateral an event starts from, less what the event before left, is what the AMM sold (Sold in soft liquidation) or bought back (Bought back in soft liquidation) in between, at the event's price. The crvUSD the AMM holds for the position from those sales (the card's Converted) is not on the bars: no event records it.