fix: sync scans immediately and mark acknowledgements

apps/web/src/sync.test.ts

@@ -10,4 +10,12 @@ describe('sync contract', () => {
     expect(source).toContain("window.addEventListener('online'")
     expect(source).toContain("document.addEventListener('visibilitychange'")
   })
+
+  it('reacts immediately to local capture events and coalesces concurrent sync requests', async () => {
+    const source = await readFile(fileURLToPath(new URL('./sync.ts', import.meta.url)), 'utf8')
+
+    expect(source).toContain('FIELDLENS_SYNC_REQUEST_EVENT')
+    expect(source).toContain('syncRequested = true')
+    expect(source).toContain('while (syncRequested)')
+  })
 })

apps/web/src/sync.ts

@@ -5,6 +5,7 @@ import {
   type SyncResponse,
 } from '@fieldlens/contracts'
 import {
+  FIELDLENS_SYNC_REQUEST_EVENT,
   acknowledgeOutboxEvent,
   failOutboxEvent,
   getInstallationId,
@@ -57,10 +58,17 @@ export async function ensureDeviceRegistered(): Promise<RegisteredDevice | null>
 }
 
 let syncInFlight: Promise<void> | null = null
+let syncRequested = false
 
 export function syncNow() {
+  syncRequested = true
   if (syncInFlight) return syncInFlight
-  syncInFlight = runSync().finally(() => { syncInFlight = null })
+  syncInFlight = (async () => {
+    do {
+      syncRequested = false
+      await runSync()
+    } while (syncRequested)
+  })().finally(() => { syncInFlight = null })
   return syncInFlight
 }
 
@@ -103,12 +111,14 @@ export function installSyncTriggers() {
     if (document.visibilityState === 'visible') attempt()
   }
   window.addEventListener('online', attempt)
+  window.addEventListener(FIELDLENS_SYNC_REQUEST_EVENT, attempt)
   document.addEventListener('visibilitychange', onVisible)
   const interval = window.setInterval(attempt, 30_000)
   attempt()
 
   return () => {
     window.removeEventListener('online', attempt)
+    window.removeEventListener(FIELDLENS_SYNC_REQUEST_EVENT, attempt)
     document.removeEventListener('visibilitychange', onVisible)
     window.clearInterval(interval)
   }

packages/fieldlens-core/src/lib/database.test.ts

@@ -65,13 +65,14 @@ describe('scan persistence', () => {
   })
 
   it('marks only explicitly acknowledged events synced', async () => {
-    await recordScan('ONE', 'Code 128')
+    const first = await recordScan('ONE', 'Code 128')
     await recordScan('TWO', 'Code 128')
     const events = await database.outbox.toArray()
     await acknowledgeOutboxEvent(events[0]!.id)
     const stats = await getOutboxStats()
     expect(stats.synced).toBe(1)
     expect(stats.pending).toBe(1)
+    await expect(database.scans.get(first.id)).resolves.toMatchObject({ syncStatus: 'synced' })
   })
 
   it('queues a local pallet session without any remote dependency', async () => {

packages/fieldlens-core/src/lib/database.ts

@@ -3,6 +3,7 @@ import type { CartonLabelMajorityField, CartonLabelScan } from './cartonLabelCon
 import type { LabelFields } from './labelOcr'
 
 export const FIELDLENS_SCHEMA_VERSION = 1 as const
+export const FIELDLENS_SYNC_REQUEST_EVENT = 'fieldlens:sync-request' as const
 
 export type ScanRecord = {
   id: string
@@ -101,6 +102,11 @@ class FieldLensDatabase extends Dexie {
 
 export const database = new FieldLensDatabase()
 
+function requestBackgroundSync() {
+  if (typeof window === 'undefined') return
+  window.dispatchEvent(new Event(FIELDLENS_SYNC_REQUEST_EVENT))
+}
+
 function outboxEvent(
   aggregateId: string,
   eventType: OutboxRecord['eventType'],
@@ -119,7 +125,7 @@ function outboxEvent(
 }
 
 export async function recordScan(rawValue: string, format: string) {
-  return database.transaction('rw', database.scans, database.outbox, async () => {
+  const record = await database.transaction('rw', database.scans, database.outbox, async () => {
     const existing = await database.scans.where('rawValue').equals(rawValue).first()
     const nextRecord: ScanRecord = {
       id: crypto.randomUUID(),
@@ -141,6 +147,8 @@ export async function recordScan(rawValue: string, format: string) {
     }, nextRecord.scannedAt))
     return nextRecord
   })
+  requestBackgroundSync()
+  return record
 }
 
 export async function startEanPalletSession(targetCount: number) {
@@ -346,11 +354,20 @@ export async function getOutboxStats() {
 }
 
 export async function acknowledgeOutboxEvent(id: string) {
+  await database.transaction('rw', database.outbox, database.scans, async () => {
+    const event = await database.outbox.get(id)
+    if (!event) return
+
     await database.outbox.update(id, {
       syncedAt: new Date().toISOString(),
       lastError: undefined,
       nextAttemptAt: undefined,
     })
+
+    if (event.eventType === 'scan.captured') {
+      await database.scans.update(event.aggregateId, { syncStatus: 'synced' })
+    }
+  })
 }
 
 export async function failOutboxEvent(id: string, error: string) {