fix: use >= for same-second upload change detection

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: DaxServer

backend/src/core/handler.ts

@@ -640,7 +640,9 @@ export class Handler {
     const poll = async () => {
       try {
         const current = await this.services.uploads.getLatestUploadUpdateTime(batchid)
-        if (current && (!lastUpdateTime || current > lastUpdateTime)) {
+        // Use >= to catch uploads that update within the same MySQL second as lastUpdateTime.
+        // Only advance lastUpdateTime on strict > to avoid infinite re-polls at a stale timestamp.
+        if (current && (!lastUpdateTime || current >= lastUpdateTime)) {
           const since = lastUpdateTime ?? new Date(0)
           const changed = await this.services.uploads.getUploadsByBatchChangedSince(batchid, since)
           if (changed.length > 0) {
@@ -651,7 +653,9 @@ export class Handler {
               nonce: nonce(),
             })
           }
-          lastUpdateTime = current
+          if (!lastUpdateTime || current > lastUpdateTime) {
+            lastUpdateTime = current
+          }
         }
         const [total, active] = await Promise.all([
           this.services.batches.countUploadsInBatch(batchid),

backend/src/db/dal/uploads.ts

@@ -11,6 +11,7 @@ import {
   eq,
   getTableColumns,
   gt,
+  gte,
   inArray,
   like,
   lt,
@@ -550,7 +551,7 @@ export class UploadService {
     return this.db
       .select(cols)
       .from(uploadRequests)
-      .where(and(eq(uploadRequests.batchid, batchId), gt(uploadRequests.updated_at, since)))
+      .where(and(eq(uploadRequests.batchid, batchId), gte(uploadRequests.updated_at, since)))
       .orderBy(asc(uploadRequests.id))
   }