diff --git a/config/business_data.php b/config/business_data.php
index 9bee3e39..7cca91bc 100644
--- a/config/business_data.php
+++ b/config/business_data.php
@@ -25,6 +25,7 @@ return [
         'password' => env('BUSINESS_CLICKHOUSE_PASSWORD', ''),
         'connect_timeout_seconds' => (float) env('BUSINESS_CLICKHOUSE_CONNECT_TIMEOUT', 3),
         'query_timeout_seconds' => (float) env('BUSINESS_CLICKHOUSE_QUERY_TIMEOUT', 30),
+        'stream_timeout_seconds' => (float) env('BUSINESS_CLICKHOUSE_STREAM_TIMEOUT', 1800),
     ],
 
     'archive' => [
diff --git a/modules/EcommerceFinance/Services/ClickHouseClient.php b/modules/EcommerceFinance/Services/ClickHouseClient.php
index dc7cbc1b..3336b1c1 100644
--- a/modules/EcommerceFinance/Services/ClickHouseClient.php
+++ b/modules/EcommerceFinance/Services/ClickHouseClient.php
@@ -157,6 +157,9 @@ class ClickHouseClient
         }
 
         $options = $this->authOptions() + ['query' => $query, 'stream' => $stream];
+        if ($stream) {
+            $options['timeout'] = (float) $this->config()['stream_timeout_seconds'];
+        }
         if ($body !== null) {
             $options['body'] = $body;
         }
@@ -196,6 +199,7 @@ class ClickHouseClient
             'password' => '',
             'connect_timeout_seconds' => 3,
             'query_timeout_seconds' => 30,
+            'stream_timeout_seconds' => 1800,
         ];
     }
 }
diff --git a/modules/EcommerceFinance/Services/ClickHouseSchemaManager.php b/modules/EcommerceFinance/Services/ClickHouseSchemaManager.php
index 92080fa5..19cedaea 100644
--- a/modules/EcommerceFinance/Services/ClickHouseSchemaManager.php
+++ b/modules/EcommerceFinance/Services/ClickHouseSchemaManager.php
@@ -3,6 +3,7 @@
 namespace Modules\EcommerceFinance\Services;
 
 use Modules\EcommerceFinance\Contracts\BusinessMirrorDataset;
+use RuntimeException;
 
 class ClickHouseSchemaManager
 {
@@ -16,6 +17,10 @@ class ClickHouseSchemaManager
     /** @return list<array<string,mixed>> */
     public function ensure(BusinessMirrorDataset $dataset): array
     {
+        if (! in_array($this->placements->targetStore($dataset->key()), ['clickhouse', 'parquet'], true)) {
+            throw new RuntimeException('business_data_dataset_not_columnar');
+        }
+
         $columns = $this->sourceSchemas->columns($dataset);
         $definitions = ['`_mirror_key` String'];
         foreach ($columns as $column) {
@@ -62,7 +67,8 @@ class ClickHouseSchemaManager
 
         return match ($type) {
             'bit', 'boolean' => 'UInt8',
-            'tinyint' => 'Int8',
+            // SQL Server tinyint is unsigned (0..255), unlike MySQL tinyint.
+            'tinyint' => 'UInt8',
             'smallint' => 'Int16',
             'int', 'integer' => 'Int32',
             'bigint' => 'Int64',
diff --git a/tests/Unit/EcommerceFinance/ClickHouseClientTest.php b/tests/Unit/EcommerceFinance/ClickHouseClientTest.php
index 3bcb9be8..dac3d142 100644
--- a/tests/Unit/EcommerceFinance/ClickHouseClientTest.php
+++ b/tests/Unit/EcommerceFinance/ClickHouseClientTest.php
@@ -20,6 +20,7 @@ class ClickHouseClientTest extends TestCase
             new Response(200, [], "Ok.\n"),
             new Response(200, [], "{\"value\":1}\n{\"value\":2}\n"),
             new Response(200, [], ''),
+            new Response(200, [], 'PAR1'),
         ]));
         $handler->push(Middleware::history($history));
         $http = new Client(['handler' => $handler]);
@@ -41,6 +42,8 @@ class ClickHouseClientTest extends TestCase
         parse_str($history[2]['request']->getUri()->getQuery(), $insertQuery);
         $this->assertStringContainsString('FORMAT JSONEachRow', $insertQuery['query']);
         $this->assertSame("{\"id\":1,\"name\":\"测试\"}\n", (string) $history[2]['request']->getBody());
+        $this->assertSame('PAR1', (string) $client->stream('SELECT 1', 'Parquet'));
+        $this->assertSame(1800.0, $history[3]['options']['timeout']);
     }
 
     public function test_invalid_identifier_is_rejected_before_a_query_is_sent(): void
diff --git a/tests/Unit/EcommerceFinance/ColumnarBusinessMirrorRepositoryTest.php b/tests/Unit/EcommerceFinance/ColumnarBusinessMirrorRepositoryTest.php
index 67f08f66..f974a899 100644
--- a/tests/Unit/EcommerceFinance/ColumnarBusinessMirrorRepositoryTest.php
+++ b/tests/Unit/EcommerceFinance/ColumnarBusinessMirrorRepositoryTest.php
@@ -5,7 +5,10 @@ namespace Tests\Unit\EcommerceFinance;
 use Mockery;
 use Modules\EcommerceFinance\Contracts\BusinessMirrorDataset;
 use Modules\EcommerceFinance\Repositories\ColumnarBusinessMirrorRepository;
+use Modules\EcommerceFinance\Services\BusinessDataPlacement;
+use Modules\EcommerceFinance\Services\BusinessMirrorSchemaManager;
 use Modules\EcommerceFinance\Services\ClickHouseClient;
+use Modules\EcommerceFinance\Services\ClickHouseSchemaManager;
 use Tests\TestCase;
 
 class ColumnarBusinessMirrorRepositoryTest extends TestCase
@@ -38,6 +41,35 @@ class ColumnarBusinessMirrorRepositoryTest extends TestCase
         ]], '11111111-1111-4111-8111-111111111111');
     }
 
+    public function test_columnar_schema_uses_replacing_merge_tree_and_sql_server_safe_types(): void
+    {
+        $dataset = $this->dataset();
+        $source = Mockery::mock(BusinessMirrorSchemaManager::class);
+        $source->shouldReceive('columns')->once()->andReturn([
+            ['column_name' => 'Id', 'data_type' => 'int'],
+            ['column_name' => 'flag', 'data_type' => 'tinyint'],
+            ['column_name' => 'amount', 'data_type' => 'decimal', 'numeric_precision' => 20, 'numeric_scale' => 4],
+            ['column_name' => 'updated_at', 'data_type' => 'datetime2'],
+        ]);
+        $placements = Mockery::mock(BusinessDataPlacement::class);
+        $placements->shouldReceive('targetStore')->once()->with('source.schema.fact')->andReturn('clickhouse');
+        $client = Mockery::mock(ClickHouseClient::class);
+        $client->shouldReceive('identifier')->times(4)->andReturnUsing(static fn (string $name): string => '`' . $name . '`');
+        $client->shouldReceive('qualifiedTable')->once()->with('fact_rows')->andReturn('`analytics`.`fact_rows`');
+        $client->shouldReceive('command')->once()->withArgs(static fn (string $sql): bool =>
+            str_contains($sql, '`flag` Nullable(UInt8)')
+            && str_contains($sql, '`amount` Nullable(Decimal(20, 4))')
+            && str_contains($sql, "`updated_at` Nullable(DateTime64(6, 'Asia/Shanghai'))")
+            && str_contains($sql, 'ENGINE = ReplacingMergeTree(_mirror_version)')
+            && str_contains($sql, 'PARTITION BY modulo(cityHash64(_mirror_key), 32)')
+            && str_contains($sql, 'ORDER BY (_mirror_key)')
+        );
+
+        $columns = (new ClickHouseSchemaManager($source, $client, $placements))->ensure($dataset);
+
+        $this->assertCount(4, $columns);
+    }
+
     private function dataset(): BusinessMirrorDataset
     {
         return new class implements BusinessMirrorDataset {