diff --git a/config/upstream_mirrors.php b/config/upstream_mirrors.php
index a3fa313d..136f56b8 100644
--- a/config/upstream_mirrors.php
+++ b/config/upstream_mirrors.php
@@ -246,6 +246,7 @@ return [
                 ['Id'],
                 ['shop_id', 'fee_time', 'Id'],
                 ['fee_time', 'Id'],
+                ['channel', 'fee_time', 'Id', 'inout_type', 'amount'],
             ],
         ],
 
diff --git a/database/migrations/2026_09_09_170000_index_original_bill_channel_queries.php b/database/migrations/2026_09_09_170000_index_original_bill_channel_queries.php
new file mode 100644
index 00000000..5fd2f935
--- /dev/null
+++ b/database/migrations/2026_09_09_170000_index_original_bill_channel_queries.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    private const TABLE = 'ops_jst_original_bill_info';
+    private const INDEX = 'idx_original_bill_channel_time';
+
+    public function up(): void
+    {
+        if (config('system_database.mode', 'bootstrap') === 'bootstrap') return;
+        $connection = (string) config('upstream_mirrors.connection', 'business_mirror');
+        $schema = Schema::connection($connection);
+        if (! $schema->hasTable(self::TABLE) || $schema->hasIndex(self::TABLE, self::INDEX)) return;
+        $schema->table(self::TABLE, static function (Blueprint $table): void {
+            $table->index(['channel', 'fee_time', 'Id', 'inout_type', 'amount'], self::INDEX);
+        });
+    }
+
+    public function down(): void
+    {
+        if (config('system_database.mode', 'bootstrap') === 'bootstrap') return;
+        $schema = Schema::connection((string) config('upstream_mirrors.connection', 'business_mirror'));
+        if (! $schema->hasTable(self::TABLE) || ! $schema->hasIndex(self::TABLE, self::INDEX)) return;
+        $schema->table(self::TABLE, static function (Blueprint $table): void {
+            $table->dropIndex(self::INDEX);
+        });
+    }
+};
diff --git a/modules/EcommerceFinance/Repositories/StoreReceivingAlipayBillMirrorRepository.php b/modules/EcommerceFinance/Repositories/StoreReceivingAlipayBillMirrorRepository.php
index 291c982a..201f83f6 100644
--- a/modules/EcommerceFinance/Repositories/StoreReceivingAlipayBillMirrorRepository.php
+++ b/modules/EcommerceFinance/Repositories/StoreReceivingAlipayBillMirrorRepository.php
@@ -139,9 +139,48 @@ class StoreReceivingAlipayBillMirrorRepository
             'balance' => 'b.amount',
         ][$sort] ?? 'b.fee_time';
 
-        return $query->select('b.*')
-            ->orderBy($sortColumn, $direction)->orderBy('b.Id', $direction)->cursor()
-            ->map(fn (object $row): array => $this->mapRowFor($row, $shopNames[(string) $row->shop_id] ?? null, $mapping));
+        return $this->exportBatches($query, $sortColumn, $direction, $shopNames, $mapping);
+    }
+
+    /** Read bounded pages so a full export does not sort/buffer millions of rows at once. */
+    private function exportBatches(Builder $query, string $sortColumn, string $direction, array $shopNames, string $mapping): iterable
+    {
+        $operator = $direction === 'asc' ? '>' : '<';
+        $sortField = substr($sortColumn, 2);
+        $last = null;
+        $maximumId = $this->billQuery()->max('b.Id');
+        if ($maximumId === null) return;
+
+        do {
+            $batch = (clone $query)->where('b.Id', '<=', $maximumId);
+            if ($last !== null) {
+                if ($sortColumn === 'b.Id') {
+                    $batch->where('b.Id', $operator, $last->Id);
+                } else {
+                    $value = $last->{$sortField};
+                    $batch->where(function (Builder $after) use ($sortColumn, $direction, $operator, $last, $value): void {
+                        if ($value === null) {
+                            $after->where(function (Builder $ties) use ($sortColumn, $operator, $last): void {
+                                $ties->whereNull($sortColumn)->where('b.Id', $operator, $last->Id);
+                            });
+                            if ($direction === 'asc') $after->orWhereNotNull($sortColumn);
+                        } else {
+                            $after->where($sortColumn, $operator, $value)
+                                ->orWhere(function (Builder $ties) use ($sortColumn, $operator, $last, $value): void {
+                                    $ties->where($sortColumn, $value)->where('b.Id', $operator, $last->Id);
+                                });
+                            if ($direction === 'desc') $after->orWhereNull($sortColumn);
+                        }
+                    });
+                }
+            }
+            $rows = $batch->select('b.*')->orderBy($sortColumn, $direction)
+                ->orderBy('b.Id', $direction)->limit(1000)->get();
+            foreach ($rows as $row) {
+                yield $this->mapRowFor($row, $shopNames[(string) $row->shop_id] ?? null, $mapping);
+            }
+            $last = $rows->last();
+        } while ($rows->count() === 1000);
     }
 
     private function billQuery(): Builder
diff --git a/tests/Unit/EcommerceFinance/StoreReceivingAlipayBillMirrorRepositoryTest.php b/tests/Unit/EcommerceFinance/StoreReceivingAlipayBillMirrorRepositoryTest.php
index 576937b1..19368199 100644
--- a/tests/Unit/EcommerceFinance/StoreReceivingAlipayBillMirrorRepositoryTest.php
+++ b/tests/Unit/EcommerceFinance/StoreReceivingAlipayBillMirrorRepositoryTest.php
@@ -126,6 +126,68 @@ class StoreReceivingAlipayBillMirrorRepositoryTest extends TestCase
         $this->assertSame(20.10, $rows[0]['expense']);
     }
 
+    public function test_export_batches_preserve_sort_ties_nulls_and_channel_filter(): void
+    {
+        $this->markReady();
+        $db = DB::connection('business_mirror');
+        $table = $db->table('ops_jst_original_bill_info');
+        $fixtures = [];
+        for ($id = 1; $id <= 2105; $id++) {
+            $row = $this->row($id, 7, '2026-08-01 09:00:00', '1', 10);
+            $row['fee_time'] = $id <= 1005 ? null : '2026-08-01 09:00:00';
+            $row['amount'] = $id <= 1005 ? null : 10;
+            $fixtures[] = $row;
+        }
+        foreach (array_chunk($fixtures, 100) as $chunk) $table->insert($chunk);
+        $table->insert($this->row(9999, 7, '2026-08-01 09:00:00', '1', 10, 'OtherChannel'));
+        foreach (['occurred_at' => 'fee_time', 'income' => 'amount', 'record_code' => 'Id'] as $sort => $column) {
+            foreach (['asc', 'desc'] as $direction) {
+                $expected = (clone $table)->where('channel', 'CommonBillTGCPay')
+                    ->orderBy($column, $direction)->orderBy('Id', $direction)->pluck('Id')->map('strval')->all();
+                $db->flushQueryLog();
+                $db->enableQueryLog();
+                $rows = iterator_to_array($this->repository->exportChannelRows([], $sort, $direction, 'CommonBillTGCPay'));
+                $this->assertSame($expected, array_column($rows, 'record_code'));
+                $reads = array_filter($db->getQueryLog(), fn ($query) => str_contains($query['query'], 'select "b".*'));
+                $this->assertCount(3, $reads);
+                foreach ($reads as $read) $this->assertStringContainsString('limit 1000', $read['query']);
+                $db->disableQueryLog();
+            }
+        }
+    }
+
+    public function test_export_does_not_chase_new_rows_inserted_after_it_starts(): void
+    {
+        $this->markReady();
+        $table = DB::connection('business_mirror')->table('ops_jst_original_bill_info');
+        for ($id = 1; $id <= 1001; $id++) {
+            $table->insert($this->row($id, 7, '2026-08-01 09:00:00', '1', 10));
+        }
+        $ids = [];
+        foreach ($this->repository->exportRows([], 'record_code', 'asc') as $row) {
+            $ids[] = $row['record_code'];
+            if (count($ids) === 1) $table->insert($this->row(9999, 7, '2026-08-01 09:00:00', '1', 10));
+        }
+        $this->assertCount(1001, $ids);
+        $this->assertNotContains('9999', $ids);
+    }
+
+    public function test_channel_index_migration_and_rollback_preserve_rows(): void
+    {
+        config(['system_database.mode' => 'connected']);
+        $table = DB::connection('business_mirror')->table('ops_jst_original_bill_info');
+        $table->insert($this->row(1, 7, '2026-08-01 09:00:00', '1', 10, str_repeat('A', 101)));
+        $migration = require base_path('database/migrations/2026_09_09_170000_index_original_bill_channel_queries.php');
+        $before = (array) $table->first();
+        $migration->up();
+        $migration->up();
+        $this->assertTrue(Schema::connection('business_mirror')->hasIndex('ops_jst_original_bill_info', 'idx_original_bill_channel_time'));
+        $this->assertEquals($before, (array) $table->first());
+        $migration->down();
+        $this->assertFalse(Schema::connection('business_mirror')->hasIndex('ops_jst_original_bill_info', 'idx_original_bill_channel_time'));
+        $this->assertEquals($before, (array) $table->first());
+    }
+
     public function test_common_filters_use_the_existing_daily_summary_acceleration(): void
     {
         $this->markReady();