NAV (net asset value) time-series for a bound wallet

Persisted hourly snapshots of the wallet's NAV (liquidation equity, USD) and cumulative net external deposits, over the requested `window`. Each point is `{ t (unix seconds), navUsdc, netDepositsUsdc }`, ascending. Combine them for flow-adjusted performance: trading PnL = navUsdc − netDepositsUsdc, so a subscriber deposit (which bumps both navUsdc and netDepositsUsdc) doesn't read as a gain. Populated for Hyperliquid wallets today (NAV + exact deposits/withdrawals from our node); Polymarket lands with the dedicated Polygon node. Returns an empty series for wallets not yet snapshotted.