Update app.py

app.py

@@ -651,19 +651,19 @@ HTML_TEMPLATE = """
                     }
                     
                     const centerIdx = kList.indexOf(closestK);
-                // Modified: 20 up / 20 down
-                const start = Math.max(0, centerIdx - 20);
-                const end = Math.min(kList.length, centerIdx + 20);
-                const viewKs = kList.slice(start, end);
-                
-                OPT_SYMS.forEach(o => {
-                    if(viewKs.includes(o.k)) symbolsToFetch.push(o.s);
-                });
+                    const start = Math.max(0, centerIdx - 12);
+                    const end = Math.min(kList.length, centerIdx + 12);
+                    const viewKs = kList.slice(start, end);
+                    
+                    OPT_SYMS.forEach(o => {
+                        if(viewKs.includes(o.k)) symbolsToFetch.push(o.s);
+                    });
+                }
             } else {
+                 // Fallback if no spot price yet (initial load)
                  const kList = Array.from(document.querySelectorAll('.row')).map(r => parseFloat(r.dataset.k));
                  const mid = Math.floor(kList.length/2);
-                 // Modified: 20 up / 20 down
-                 const viewKs = kList.slice(Math.max(0, mid-20), mid+20);
+                 const viewKs = kList.slice(Math.max(0, mid-10), mid+10);
                  OPT_SYMS.forEach(o => { if(viewKs.includes(o.k)) symbolsToFetch.push(o.s); });
             }