try to fix active stocks losing price updates

src/worker/index.ts

@@ -144,25 +144,38 @@ const priceWorker = new Worker(
       }
 
       const shouldDeactivate = ttlExpired && ownerCount === 0
-      await prisma.hashtag.update({
+      const floorPrice = calcPrice(0)
+      await prisma.$transaction([
+        prisma.hashtag.update({
           where: { id: hashtagId },
           data: {
             zeroCount: newZeroCount,
             isActive: shouldDeactivate ? false : hashtag.isActive,
             lastUpdated: new Date(),
           },
-      })
+        }),
+        // Record floor price in history while the stock is still active so the chart has no gaps
+        ...(!shouldDeactivate ? [prisma.priceHistory.create({
+          data: { hashtagId, price: floorPrice, postsPerHour: 0 },
+        })] : []),
+      ])
       console.log(`[price] #${tag} got 0 posts (zeroCount=${newZeroCount})${shouldDeactivate ? ' — deactivated (TTL expired, no holders)' : ''}`)
       return
     }
 
-    // If TTL expired and no holders, deactivate instead of updating
+    // If TTL expired and no holders, record final price then deactivate
     if (ttlExpired && ownerCount === 0) {
-      await prisma.hashtag.update({
+      const finalPrice = calcPrice(postsPerHour)
+      await prisma.$transaction([
+        prisma.hashtag.update({
           where: { id: hashtagId },
-        data: { isActive: false, lastUpdated: new Date() },
-      })
-      console.log(`[price] #${tag} deactivated — TTL expired, no holders`)
+          data: { currentPrice: finalPrice, isActive: false, lastUpdated: new Date() },
+        }),
+        prisma.priceHistory.create({
+          data: { hashtagId, price: finalPrice, postsPerHour },
+        }),
+      ])
+      console.log(`[price] #${tag} deactivated — TTL expired, no holders (final price $${finalPrice.toFixed(2)})`)
       return
     }