diff --git a/docker/openboxes.yml b/docker/openboxes.yml
index b31f909e1e..b1143bf819 100644
--- a/docker/openboxes.yml
+++ b/docker/openboxes.yml
@@ -31,3 +31,11 @@ openboxes:
             enabled: true
             daysUntilExpiry: 90
             cronExpression: 0 0 0 * * ?
+
+        # Gates our InventorySnapshotEtlService — restores Phase 2 of OBPIH-3280
+        # so stock alerts actually have data (openboxes/openboxes#4742).
+        # Already defaults to true in upstream application.yml; set explicitly
+        # here so the fix survives if upstream eventually removes the orphan key
+        # during housekeeping.
+        refreshInventorySnapshotAfterTransactionJob:
+            enabled: true
diff --git a/grails-app/services/org/pih/warehouse/custom/stockAlertRestore/InventorySnapshotEtlService.groovy b/grails-app/services/org/pih/warehouse/custom/stockAlertRestore/InventorySnapshotEtlService.groovy
new file mode 100644
index 0000000000..8cc1564d44
--- /dev/null
+++ b/grails-app/services/org/pih/warehouse/custom/stockAlertRestore/InventorySnapshotEtlService.groovy
@@ -0,0 +1,137 @@
+package org.pih.warehouse.custom.stockAlertRestore
+
+import grails.gorm.transactions.Transactional
+import grails.util.Holders
+import groovy.sql.Sql
+import org.pih.warehouse.inventory.RefreshProductAvailabilityEvent
+import org.springframework.context.ApplicationListener
+import org.springframework.core.Ordered
+import org.springframework.transaction.support.TransactionSynchronizationAdapter
+import org.springframework.transaction.support.TransactionSynchronizationManager
+
+import javax.sql.DataSource
+
+/**
+ * Restores Phase 2 of OBPIH-3280 — copies product_availability rows into inventory_snapshot
+ * with date = current_date + 1, so the stock-alert view chain (which still reads from
+ * inventory_snapshot) sees the current quantities a transaction just produced.
+ *
+ * Upstream PR #2018 deleted RefreshInventorySnapshotAfterTransactionJob with the explicit
+ * deferred follow-up "need to ETL product availability records to inventory snapshot" —
+ * never delivered. This service finishes that pivot rather than rolling it back: pa stays
+ * the live source of truth; inventory_snapshot is a derived projection.
+ *
+ * Wired via RefreshProductAvailabilityEvent (Transaction.afterInsert / afterUpdate). Work
+ * is registered inside an afterCommit synchronization so the originating DB transaction
+ * has committed before pa is refreshed and copied — otherwise the recompute would race
+ * the still-open transaction_entry insert and read stale state.
+ *
+ * Gated by openboxes.jobs.refreshInventorySnapshotAfterTransactionJob.enabled (reuses the
+ * config key from the pre-2020 deleted job; already shipped at true in application.yml).
+ */
+@Transactional
+class InventorySnapshotEtlService implements ApplicationListener<RefreshProductAvailabilityEvent>, Ordered {
+
+    def productAvailabilityService
+    DataSource dataSource
+
+    @Override
+    int getOrder() {
+        return Ordered.LOWEST_PRECEDENCE
+    }
+
+    void onApplicationEvent(RefreshProductAvailabilityEvent event) {
+        if (!isEnabled()) {
+            return
+        }
+        if (event?.disableRefresh) {
+            return
+        }
+        if (!event?.locationId) {
+            return
+        }
+
+        String locationId = event.locationId
+        List productIds = event.productIds ? new ArrayList(event.productIds) : []
+
+        log.info "InventorySnapshotEtlService scheduled for locationId=${locationId} productIds=${productIds.size()}"
+
+        if (TransactionSynchronizationManager.isSynchronizationActive()) {
+            TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronizationAdapter() {
+                @Override
+                void afterCommit() {
+                    runEtl(locationId, productIds)
+                }
+            })
+        } else {
+            runEtl(locationId, productIds)
+        }
+    }
+
+    private void runEtl(String locationId, List productIds) {
+        // forceRefresh = true so saveProductAvailability DELETEs stale pa rows for this
+        // location/product before re-inserting — otherwise pa rows for vanished
+        // inventoryItem/bin combinations would survive the upsert with their old QOH.
+        productAvailabilityService.refreshProductsAvailability(locationId, productIds, Boolean.TRUE)
+        copySnapshotFromProductAvailability(locationId, productIds)
+    }
+
+    private boolean isEnabled() {
+        return Holders.config.openboxes.jobs.refreshInventorySnapshotAfterTransactionJob.enabled == true
+    }
+
+    private void copySnapshotFromProductAvailability(String locationId, List productIds) {
+        Date tomorrow = new Date() + 1
+        tomorrow.clearTime()
+        String tomorrowString = tomorrow.format("yyyy-MM-dd HH:mm:ss")
+
+        boolean filterByProducts = productIds && !productIds.isEmpty()
+        String productFilter = filterByProducts
+                ? "AND pa.product_id IN (${productIds.collect { "'${it}'" }.join(',')})"
+                : ""
+        String snapshotDeleteProductFilter = filterByProducts
+                ? "AND product_id IN (${productIds.collect { "'${it}'" }.join(',')})"
+                : ""
+
+        // Wipe the target-date rows for the affected location/products before re-inserting.
+        // The inventory_snapshot unique key is (date, location, product_code, lot_number,
+        // bin_location_name); a plain ON DUPLICATE KEY UPDATE would leave stale rows whose
+        // (lot, bin) combinations no longer appear in pa.
+        String deleteSql = """
+            DELETE FROM inventory_snapshot
+            WHERE date = '${tomorrowString}'
+              AND location_id = '${locationId}'
+              ${snapshotDeleteProductFilter}
+        """
+
+        String insertSql = """
+            INSERT INTO inventory_snapshot
+                (id, version, date, location_id, product_id, product_code,
+                 inventory_item_id, lot_number, expiration_date,
+                 bin_location_id, bin_location_name,
+                 quantity_on_hand, date_created, last_updated)
+            SELECT UUID(), 0, '${tomorrowString}',
+                   pa.location_id, pa.product_id, pa.product_code,
+                   pa.inventory_item_id,
+                   COALESCE(pa.lot_number, 'DEFAULT'),
+                   ii.expiration_date,
+                   pa.bin_location_id,
+                   COALESCE(pa.bin_location_name, 'DEFAULT'),
+                   pa.quantity_on_hand,
+                   NOW(), NOW()
+            FROM product_availability pa
+            LEFT JOIN inventory_item ii ON ii.id = pa.inventory_item_id
+            WHERE pa.location_id = '${locationId}'
+              ${productFilter}
+        """
+
+        Sql sql = new Sql(dataSource)
+        try {
+            int deleted = sql.executeUpdate(deleteSql)
+            int inserted = sql.executeUpdate(insertSql)
+            log.info "InventorySnapshotEtlService wrote location=${locationId} date=${tomorrowString} deleted=${deleted} inserted=${inserted}"
+        } finally {
+            sql.close()
+        }
+    }
+}