Preserve historical ETH networth data in charts

Remove server-side usdValue filter to preserve historical ETH-only records.
Filter on client instead: ETH mode shows all records, USD mode filters
for records with usdValue.

Author: claude

client/src/hooks/useHono.ts

@@ -115,10 +115,14 @@ export function useNetworthTimeSeries(currency: string | undefined) {
       const res = await honoClient.balances.networth.$get()
       const json = await res.json()
 
-      return json.map((item) => ({
-        ...item,
-        value: currency === 'ETH' ? item.ethValue : (item.usdValue as number),
-      }))
+      // For ETH: all records are valid (they all have ethValue)
+      // For USD: only records with usdValue are valid
+      return json
+        .filter((item) => currency === 'ETH' || item.usdValue != null)
+        .map((item) => ({
+          ...item,
+          value: currency === 'ETH' ? item.ethValue : (item.usdValue as number),
+        }))
     },
   })
 }

server/src/handlers/balances.ts

@@ -182,7 +182,6 @@ export async function getNetworthTimeSeries(c: Context) {
   const networth = await db
     .selectFrom('networth')
     .selectAll()
-    .where('usdValue', 'is not', null)
     .limit(60)
     .orderBy('timestamp', 'desc')
     .execute()