diff --git a/database/migrations/2026_09_26_010000_create_inventory_report_authoritative_months.php b/database/migrations/2026_09_26_010000_create_inventory_report_authoritative_months.php
new file mode 100644
index 00000000..5814a698
--- /dev/null
+++ b/database/migrations/2026_09_26_010000_create_inventory_report_authoritative_months.php
@@ -0,0 +1,70 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    private function connection(): string
+    {
+        return (string) config('upstream_mirrors.connection', 'business_mirror');
+    }
+
+    public function up(): void
+    {
+        $connection = $this->connection();
+        $schema = Schema::connection($connection);
+
+        if (! $schema->hasTable('inventory_report_authoritative_months')) {
+            $schema->create('inventory_report_authoritative_months', function (Blueprint $table): void {
+                $table->string('dataset_key', 120);
+                $table->date('source_month');
+                $table->string('status', 24)->default('succeeded');
+                $table->uuid('active_generation')->nullable();
+                $table->string('source_filename', 255)->nullable();
+                $table->char('source_sha256', 64)->nullable();
+                $table->unsignedBigInteger('source_row_count')->default(0);
+                $table->dateTime('last_succeeded_at')->nullable();
+                $table->timestamps();
+
+                $table->primary(['dataset_key', 'source_month']);
+                $table->index(
+                    ['dataset_key', 'source_month', 'active_generation'],
+                    'inventory_report_authoritative_month_lookup',
+                );
+            });
+        }
+
+        // Preserve the already imported single-month snapshot when upgrading
+        // from the original one-row state table.
+        if ($schema->hasTable('inventory_report_authoritative_states')) {
+            $legacy = DB::connection($connection)
+                ->table('inventory_report_authoritative_states')
+                ->where('dataset_key', 'jiansun.inventory-report.authoritative-month')
+                ->whereNotNull('source_month')
+                ->whereNotNull('active_generation')
+                ->first();
+            if ($legacy !== null) {
+                DB::connection($connection)->table('inventory_report_authoritative_months')->insertOrIgnore([
+                    'dataset_key' => (string) $legacy->dataset_key,
+                    'source_month' => $legacy->source_month,
+                    'status' => (string) ($legacy->status ?: 'succeeded'),
+                    'active_generation' => $legacy->active_generation,
+                    'source_filename' => $legacy->source_filename,
+                    'source_sha256' => $legacy->source_sha256,
+                    'source_row_count' => (int) ($legacy->source_row_count ?? 0),
+                    'last_succeeded_at' => $legacy->last_succeeded_at,
+                    'created_at' => $legacy->created_at,
+                    'updated_at' => $legacy->updated_at,
+                ]);
+            }
+        }
+    }
+
+    public function down(): void
+    {
+        Schema::connection($this->connection())->dropIfExists('inventory_report_authoritative_months');
+    }
+};
diff --git a/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php b/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
index d4019f2b..f75e3500 100644
--- a/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
+++ b/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
@@ -726,17 +726,13 @@ class ThirdPartyWarehouseStorageMirrorRepository
             }
 
             $month = Carbon::parse($period['start'])->startOfMonth()->toDateString();
-            $state = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_STATE_TABLE)
-                ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
-                ->whereNotNull('active_generation')
-                ->where('source_month', $month)
-                ->first();
-            if ($state === null || trim((string) $state->active_generation) === '') {
+            $authority = $this->currentMonthlyInventoryAuthority($period);
+            if ($authority === null) {
                 return null;
             }
 
             $query = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_ROW_TABLE)
-                ->where('generation', (string) $state->active_generation)
+                ->where('generation', $authority['generation'])
                 ->where('report_month', $month)
                 ->select([
                     'owner', 'report_month', 'warehouse_provider', 'warehouse',
@@ -1267,11 +1263,16 @@ class ThirdPartyWarehouseStorageMirrorRepository
     private function currentMonthlyInventoryAuthority(array $period): ?array
     {
         $month = Carbon::parse($period['start'])->startOfMonth();
-        $state = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_STATE_TABLE)
-            ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
-            ->whereNotNull('active_generation')
-            ->whereDate('source_month', '=', $month->toDateString())
+        $state = $this->monthlyAuthorityStateQuery()
+            ?->whereDate('source_month', '=', $month->toDateString())
             ->first();
+        if ($state === null) {
+            $state = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_STATE_TABLE)
+                ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
+                ->whereNotNull('active_generation')
+                ->whereDate('source_month', '=', $month->toDateString())
+                ->first();
+        }
         if ($state === null || trim((string) $state->active_generation) === '') {
             return null;
         }
@@ -1285,12 +1286,19 @@ class ThirdPartyWarehouseStorageMirrorRepository
     /** @param array{start:string,end:string} $period */
     private function previousMonthlyInventoryAuthority(array $period): ?array
     {
-        $state = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_STATE_TABLE)
-            ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
-            ->whereNotNull('active_generation')
-            ->whereDate('source_month', '<', Carbon::parse($period['start'])->startOfMonth())
+        $month = Carbon::parse($period['start'])->startOfMonth();
+        $state = $this->monthlyAuthorityStateQuery()
+            ?->whereDate('source_month', '<', $month)
             ->orderByDesc('source_month')
             ->first();
+        if ($state === null) {
+            $state = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_STATE_TABLE)
+                ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
+                ->whereNotNull('active_generation')
+                ->whereDate('source_month', '<', $month)
+                ->orderByDesc('source_month')
+                ->first();
+        }
         if ($state === null || trim((string) $state->active_generation) === '') {
             return null;
         }
@@ -1301,6 +1309,23 @@ class ThirdPartyWarehouseStorageMirrorRepository
         ];
     }
 
+    private function monthlyAuthorityStateQuery(): ?Builder
+    {
+        try {
+            $schema = Schema::connection($this->connection->getName());
+            if (! $schema->hasTable('inventory_report_authoritative_months')) {
+                return null;
+            }
+
+            return $this->connection->table('inventory_report_authoritative_months')
+                ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
+                ->where('status', 'succeeded')
+                ->whereNotNull('active_generation');
+        } catch (Throwable) {
+            return null;
+        }
+    }
+
     /** @return array{0:string,1:list<mixed>} */
     private function subwarehouseIdSql(string $providerColumn, string $warehouseColumn): array
     {
diff --git a/modules/EcommerceFinance/Services/InventoryReportAuthoritativeImporter.php b/modules/EcommerceFinance/Services/InventoryReportAuthoritativeImporter.php
index 7dc9118a..aabe3f60 100644
--- a/modules/EcommerceFinance/Services/InventoryReportAuthoritativeImporter.php
+++ b/modules/EcommerceFinance/Services/InventoryReportAuthoritativeImporter.php
@@ -24,6 +24,8 @@ class InventoryReportAuthoritativeImporter
 
     private const ROW_TABLE = 'inventory_report_authoritative_rows';
 
+    private const MONTH_TABLE = 'inventory_report_authoritative_months';
+
     /** @var list<string> */
     private const REQUIRED_HEADERS = [
         '货主', '月份', '仓储方', '仓库', '商品编码', '分类', '期初数量', '期末数量',
@@ -84,6 +86,23 @@ class InventoryReportAuthoritativeImporter
                 $source,
                 $now,
             ): void {
+                if ($this->hasMonthlyStateTable()) {
+                    $this->connection->table(self::MONTH_TABLE)->updateOrInsert(
+                        [
+                            'dataset_key' => self::DATASET_KEY,
+                            'source_month' => $source['source_month'],
+                        ],
+                        [
+                            'status' => 'succeeded',
+                            'active_generation' => $generation,
+                            'source_filename' => mb_substr(basename($path), 0, 255),
+                            'source_sha256' => $hash,
+                            'source_row_count' => $source['source_rows'],
+                            'last_succeeded_at' => $now,
+                            'updated_at' => $now,
+                        ],
+                    );
+                }
                 $this->connection->table(self::STATE_TABLE)
                     ->where('dataset_key', self::DATASET_KEY)
                     ->update([
@@ -116,8 +135,21 @@ class InventoryReportAuthoritativeImporter
         }
 
         try {
+            $keepGenerations = [$generation];
+            if ($this->hasMonthlyStateTable()) {
+                $keepGenerations = array_merge(
+                    $keepGenerations,
+                    $this->connection->table(self::MONTH_TABLE)
+                        ->where('dataset_key', self::DATASET_KEY)
+                        ->whereNotNull('active_generation')
+                        ->pluck('active_generation')
+                        ->map(static fn (mixed $value): string => (string) $value)
+                        ->all(),
+                );
+            }
+            $keepGenerations = array_values(array_unique(array_filter($keepGenerations)));
             $this->connection->table(self::ROW_TABLE)
-                ->where('generation', '!=', $generation)
+                ->whereNotIn('generation', $keepGenerations)
                 ->delete();
         } catch (Throwable $exception) {
             report($exception);
@@ -154,6 +186,11 @@ class InventoryReportAuthoritativeImporter
         }
     }
 
+    private function hasMonthlyStateTable(): bool
+    {
+        return Schema::connection($this->connection->getName())->hasTable(self::MONTH_TABLE);
+    }
+
     /** @return array{source_rows:int,source_month:string} */
     private function readAndStore(string $path, string $generation, mixed $importedAt): array
     {
diff --git a/tests/Feature/Console/InventoryReportAuthoritativeImportTest.php b/tests/Feature/Console/InventoryReportAuthoritativeImportTest.php
index 0084087b..e42f7831 100644
--- a/tests/Feature/Console/InventoryReportAuthoritativeImportTest.php
+++ b/tests/Feature/Console/InventoryReportAuthoritativeImportTest.php
@@ -69,6 +69,32 @@ class InventoryReportAuthoritativeImportTest extends TestCase
         ], 'business_mirror');
     }
 
+    public function test_it_keeps_authoritative_generations_for_multiple_months(): void
+    {
+        $august = app(InventoryReportAuthoritativeImporter::class)->import($this->workbook([
+            $this->headers(),
+            $this->row('2026-08-01', '仓储方', '主仓', 'SKU-A', 10, 12, ['采购进仓' => 2]),
+        ]));
+        $july = app(InventoryReportAuthoritativeImporter::class)->import($this->workbook([
+            $this->headers(),
+            $this->row('2026-07-01', '仓储方', '主仓', 'SKU-A', 8, 10, ['采购进仓' => 2]),
+        ]));
+
+        $months = DB::connection('business_mirror')
+            ->table('inventory_report_authoritative_months')
+            ->where('dataset_key', InventoryReportAuthoritativeImporter::DATASET_KEY)
+            ->orderBy('source_month')
+            ->get();
+
+        $this->assertCount(2, $months);
+        $this->assertSame('2026-07-01', (string) $months[0]->source_month);
+        $this->assertSame($july['generation'], (string) $months[0]->active_generation);
+        $this->assertSame('2026-08-01', (string) $months[1]->source_month);
+        $this->assertSame($august['generation'], (string) $months[1]->active_generation);
+        $this->assertSame(2, DB::connection('business_mirror')
+            ->table('inventory_report_authoritative_rows')->count());
+    }
+
     public function test_invalid_replacement_keeps_previous_generation(): void
     {
         $valid = app(InventoryReportAuthoritativeImporter::class)->import($this->workbook([
@@ -158,6 +184,18 @@ class InventoryReportAuthoritativeImportTest extends TestCase
             $table->dateTime('imported_at');
             $table->primary(['generation', 'row_key']);
         });
+        $schema->create('inventory_report_authoritative_months', function (Blueprint $table): void {
+            $table->string('dataset_key');
+            $table->date('source_month');
+            $table->string('status')->default('succeeded');
+            $table->string('active_generation')->nullable();
+            $table->string('source_filename')->nullable();
+            $table->string('source_sha256')->nullable();
+            $table->unsignedBigInteger('source_row_count')->default(0);
+            $table->dateTime('last_succeeded_at')->nullable();
+            $table->timestamps();
+            $table->primary(['dataset_key', 'source_month']);
+        });
     }
 
     private function headers(): array