diff --git a/docs/BENCHMARK-SCALE.md b/docs/BENCHMARK-SCALE.md
index d522e1b..ef27d17 100644
--- a/docs/BENCHMARK-SCALE.md
+++ b/docs/BENCHMARK-SCALE.md
@@ -55,6 +55,7 @@ SQL 的形狀與實際程式一致：原生是 WP_Query 的 meta_query（每個
 2. **扁平表的價值集中在「搜尋與篩選」。** 單筆或批次讀 meta（情境 4–6）三種形式都在 1 ms 內，差距可以忽略，而且實務上還有 object cache。
 3. **寬範圍搜尋仍有瓶頸（情境 1，p50 約 0.6 秒、p95 約 3.7 秒）。** 命中 18 萬筆時，優化器選擇全表掃描；再加上 `SQL_CALC_FOUND_ROWS` 要算總數、`ORDER BY post_date` 要排序，還要 JOIN 回 `posts` 過濾狀態。p50 和 p95 差很多，是因為不同的價格區間讓優化器選了不同的執行計畫。
    - **PR-028**：post 群組表可存 `post_status`、`post_date` 副本與 `(post_status, post_date)` 索引（`wp tmdo post-status-sync`）。1M 列實測：加欄位 0.05 秒（instant）、建索引 5.3 秒、分批（1,000 列）回填 32 秒，之後與 `posts` 0 筆不一致。欄位 collation 必須跟 `posts.post_status` 相同，否則比對會出現 illegal mix of collations。查詢改寫在 PR-029。
+   - **PR-029**：副本 ready 且無 NULL 時，單一 post type、明確狀態、依日期排序的搜尋改為 INNER JOIN、`post_status IN (…)`、`ORDER BY` 副本 `post_date`、不 GROUP BY（bench 變體 `entity+copy`，`--iterations=5`）。仍帶 `SQL_CALC_FOUND_ROWS` 時：情境 1 p50 670→770 ms、**p95 3,739→773 ms**；情境 2 p50 356→448 ms（變慢，因為算總數仍要掃完所有符合列）。拿掉 `SQL_CALC_FOUND_ROWS` 後同形狀情境 1 只要 **8 ms**（走 `idx_post_status_date`、LIMIT 提早結束）→ 完整效益要搭配 PR-030。
 4. **Hot 表的索引規則有漏洞。** `add_covering_indexes()` 只替 decimal、tinyint，以及名稱以 `_time` 結尾的 bigint 建索引，所以 `hp_vendor` 沒有索引，情境 3 要 3.4 秒，比 Entity 慢約 12,000 倍。
 5. **Entity 表只有單欄索引。** 情境 2 輸給有複合索引的 Hot 表（337 ms 對 277 ms）。
    - **PR-027 之後**：群組可用 `register_group( ..., array( 'indexes' => ... ) )` 宣告複合索引。在 1M 列的 Entity 表加上 `cidx_verified_price (hp_verified, hp_price)` 花 8.1 秒；重跑情境 2（`--iterations=10`），Entity p50 從 337 ms 降到 **278 ms**（p95 285 ms），Hot 是 269 ms（p95 280 ms），差距在量測誤差內。執行計畫改走 `e:cidx_verified_price`。
diff --git a/includes/query/class-tmdo-post-query-router.php b/includes/query/class-tmdo-post-query-router.php
index 8060ebc..2b486f4 100644
--- a/includes/query/class-tmdo-post-query-router.php
+++ b/includes/query/class-tmdo-post-query-router.php
@@ -20,6 +20,13 @@
  *   3. posts_where    — append WHERE conditions targeting flat columns
  *   4. posts_groupby  — ensure GROUP BY posts.ID to dedup join multiplication
  *
+ * Status / date on the flat table (O-1): when the group's post_status /
+ * post_date copies are ready (TMDO_Post_Status_Sync) and none is missing,
+ * a single-post-type search with explicit statuses and date ordering
+ * INNER JOINs the table, filters the copies, orders by the copied
+ * post_date and skips GROUP BY (one row per post), so MySQL can walk
+ * `idx_post_status_date` and stop at the LIMIT.
+ *
  * 🔒 v2.9.x → v2.10.x frozen contract: never touches user entity. Routes
  * only entity_type='post'.
  *
@@ -43,6 +50,16 @@ class TMDO_Post_Query_Router {
 	/** Query var key for capturing routed clauses (consumed by posts_join/where). */
 	private const QUERY_VAR = 'wpdo_post_clauses';
 
+	/** Query var holding the status / date copy route, when one applies. */
+	private const COPY_VAR = 'wpdo_post_copy_route';
+
+	/**
+	 * Per-request answer to "are this group's copies usable?".
+	 *
+	 * @var array<string, bool>
+	 */
+	private static array $copies_usable = array();
+
 	/**
 	 * Register all WP_Query hooks.
 	 *
@@ -53,6 +70,7 @@ class TMDO_Post_Query_Router {
 		add_filter( 'posts_join', array( $this, 'posts_join' ), 10, 2 );
 		add_filter( 'posts_where', array( $this, 'posts_where' ), 10, 2 );
 		add_filter( 'posts_groupby', array( $this, 'posts_groupby' ), 10, 2 );
+		add_filter( 'posts_orderby', array( $this, 'posts_orderby' ), 10, 2 );
 	}
 
 	/**
@@ -134,6 +152,11 @@ class TMDO_Post_Query_Router {
 
 		$query->set( 'meta_query', $remaining );
 		$query->set( self::QUERY_VAR, $routed );
+
+		$copy = self::copy_route( $query, $routed );
+		if ( $copy ) {
+			$query->set( self::COPY_VAR, $copy );
+		}
 	}
 
 	/**
@@ -167,7 +190,8 @@ class TMDO_Post_Query_Router {
 				continue;
 			}
 
-			$join .= " LEFT JOIN `{$table}` AS `{$alias}` "
+			$type  = self::copy_route_for( $query, $post_type ) ? 'INNER' : 'LEFT';
+			$join .= " {$type} JOIN `{$table}` AS `{$alias}` "
 				. "ON (`{$wpdb->posts}`.`ID` = `{$alias}`.`post_id`)";
 		}
 
@@ -201,9 +225,31 @@ class TMDO_Post_Query_Router {
 			}
 		}
 
+		$copy = $query->get( self::COPY_VAR );
+		if ( ! empty( $copy ) ) {
+			$alias  = self::table_alias( $copy['post_type'], $copy['group'] );
+			$where .= self::build_condition( "`{$alias}`.`post_status`", 'IN', $copy['statuses'] );
+		}
+
 		return $where;
 	}
 
+	/**
+	 * Order by the flat table's post_date copy when the copy route applies.
+	 *
+	 * @param string|null $orderby Current ORDER BY SQL.
+	 * @param \WP_Query   $query   Current WP_Query.
+	 * @return string Modified ORDER BY SQL.
+	 */
+	public function posts_orderby( ?string $orderby, \WP_Query $query ): string {
+		$orderby = (string) ( $orderby ?? '' );
+		$copy    = $query->get( self::COPY_VAR );
+		if ( empty( $copy ) ) {
+			return $orderby;
+		}
+		return '`' . self::table_alias( $copy['post_type'], $copy['group'] ) . '`.`post_date` ' . $copy['order'];
+	}
+
 	/**
 	 * Ensure GROUP BY posts.ID to deduplicate JOIN-multiplied rows.
 	 *
@@ -214,7 +260,7 @@ class TMDO_Post_Query_Router {
 	public function posts_groupby( ?string $groupby, \WP_Query $query ): string {
 		$groupby = (string) ( $groupby ?? '' );
 		$routed  = $query->get( self::QUERY_VAR );
-		if ( empty( $routed ) || ! is_array( $routed ) ) {
+		if ( empty( $routed ) || ! is_array( $routed ) || ! empty( $query->get( self::COPY_VAR ) ) ) {
 			return $groupby;
 		}
 
@@ -242,6 +288,76 @@ class TMDO_Post_Query_Router {
 		return TMDO_Mode_Manager::reads_from_flat( 'post' );
 	}
 
+	/**
+	 * Forget per-request copy checks (tests, or after `post-status-sync`).
+	 *
+	 * @return void
+	 */
+	public static function flush_copy_cache(): void {
+		self::$copies_usable = array();
+	}
+
+	/**
+	 * The status / date copy route for a routed query, or [] when it does not apply.
+	 *
+	 * @param \WP_Query                        $query  Current WP_Query.
+	 * @param array<string, array<int, array>> $routed Routed clauses keyed by post type.
+	 * @return array{post_type:string, group:string, statuses:string[], order:string}|array{}
+	 */
+	private static function copy_route( \WP_Query $query, array $routed ): array {
+		if ( 1 !== count( $routed ) ) {
+			return array();
+		}
+		$post_type = (string) array_key_first( $routed );
+		$groups    = array_values( array_unique( array_column( $routed[ $post_type ], 'group' ) ) );
+		if ( 1 !== count( $groups ) || ! in_array( $query->get( 'orderby' ), array( '', 'date', 'post_date' ), true ) ) {
+			return array();
+		}
+		$statuses = $query->get( 'post_status' );
+		$statuses = array_values( array_filter( array_map( 'sanitize_key', is_array( $statuses ) ? $statuses : explode( ',', (string) $statuses ) ) ) );
+		if ( empty( $statuses ) || in_array( 'any', $statuses, true ) || ! self::copies_usable( $groups[0] ) ) {
+			return array();
+		}
+		return array(
+			'post_type' => $post_type,
+			'group'     => $groups[0],
+			'statuses'  => $statuses,
+			'order'     => 'ASC' === strtoupper( (string) $query->get( 'order' ) ) ? 'ASC' : 'DESC',
+		);
+	}
+
+	/**
+	 * Whether the copy route applies to this post type's join.
+	 *
+	 * @param \WP_Query $query     Current WP_Query.
+	 * @param string    $post_type Post type slug.
+	 * @return bool
+	 */
+	private static function copy_route_for( \WP_Query $query, string $post_type ): bool {
+		$copy = $query->get( self::COPY_VAR );
+		return ! empty( $copy ) && $copy['post_type'] === $post_type;
+	}
+
+	/**
+	 * Copies are marked ready and no row lacks them (bulk writes that bypass
+	 * the Hook Bus leave NULLs until `wp tmdo post-status-sync` runs again).
+	 * One index probe per group per request.
+	 *
+	 * @param string $group Entity group name.
+	 * @return bool
+	 */
+	private static function copies_usable( string $group ): bool {
+		if ( ! isset( self::$copies_usable[ $group ] ) ) {
+			global $wpdb;
+			$table                         = TMDO_Schema_Manager::get_table_name( 'post', $group );
+			self::$copies_usable[ $group ] = class_exists( 'TMDO_Post_Status_Sync' )
+				&& 'ready' === TMDO_Post_Status_Sync::state( $group )
+				&& TMDO_Schema_Manager::table_exists( $table )
+				&& null === $wpdb->get_var( "SELECT 1 FROM `{$table}` WHERE `post_status` IS NULL LIMIT 1" );
+		}
+		return self::$copies_usable[ $group ];
+	}
+
 	/**
 	 * Generate a deterministic JOIN alias for a (post_type, group) pair.
 	 *
diff --git a/tests/bench/run.php b/tests/bench/run.php
index 07d7c99..d725080 100644
--- a/tests/bench/run.php
+++ b/tests/bench/run.php
@@ -76,6 +76,12 @@ function flat_search( string $table, string $alias, string $conditions ): string
 		. " WHERE 1=1 AND p.post_type = 'hp_listing' AND ((p.post_status = 'publish')){$conditions} GROUP BY p.ID ORDER BY p.post_date DESC LIMIT 0, 20";
 }
 
+/** TMDO router shape with post_status / post_date copies (PR-029): INNER JOIN, no GROUP BY. */
+function flat_copy_search( string $table, string $alias, string $conditions ): string {
+	return 'SELECT SQL_CALC_FOUND_ROWS p.ID FROM `' . P . "posts` p INNER JOIN `" . P . "{$table}` AS `{$alias}` ON (p.ID = `{$alias}`.`post_id`)"
+		. " WHERE 1=1 AND p.post_type = 'hp_listing' AND ((p.post_status = 'publish')){$conditions} AND `{$alias}`.`post_status` IN ('publish') ORDER BY `{$alias}`.`post_date` DESC LIMIT 0, 20";
+}
+
 function random_ids( int $count, int $offset, int $max ): string {
 	$ids = array();
 	for ( $i = 0; $i < $count; $i++ ) {
@@ -105,6 +111,10 @@ $scenarios = array(
 			[ $lo, $hi ] = $price();
 			return array( flat_search( 'wpdo_post_hp_listing_core', 'e', " AND `e`.`hp_price` BETWEEN '{$lo}' AND '{$hi}'" ), 'SELECT FOUND_ROWS()' );
 		},
+		'entity+copy' => function () use ( $price ) {
+			[ $lo, $hi ] = $price();
+			return array( flat_copy_search( 'wpdo_post_hp_listing_core', 'e', " AND `e`.`hp_price` BETWEEN '{$lo}' AND '{$hi}'" ), 'SELECT FOUND_ROWS()' );
+		},
 	),
 	'2. 價格區間 + verified=1'            => array(
 		'native' => function () use ( $price ) {
@@ -127,6 +137,10 @@ $scenarios = array(
 			[ $lo, $hi ] = $price();
 			return array( flat_search( 'wpdo_post_hp_listing_core', 'e', " AND `e`.`hp_price` BETWEEN '{$lo}' AND '{$hi}' AND `e`.`hp_verified` = '1'" ), 'SELECT FOUND_ROWS()' );
 		},
+		'entity+copy' => function () use ( $price ) {
+			[ $lo, $hi ] = $price();
+			return array( flat_copy_search( 'wpdo_post_hp_listing_core', 'e', " AND `e`.`hp_price` BETWEEN '{$lo}' AND '{$hi}' AND `e`.`hp_verified` = '1'" ), 'SELECT FOUND_ROWS()' );
+		},
 	),
 	'3. 某 vendor 名下 listing'          => array(
 		'post_parent' => fn() => array( 'SELECT SQL_CALC_FOUND_ROWS p.ID FROM `' . P . "posts` p WHERE p.post_parent = " . mt_rand( 1, $vendors ) . " AND p.post_type = 'hp_listing' AND ((p.post_status = 'publish')) ORDER BY p.post_date DESC LIMIT 0, 20", 'SELECT FOUND_ROWS()' ),
diff --git a/tests/integration/PostQueryRouterCopyTest.php b/tests/integration/PostQueryRouterCopyTest.php
new file mode 100644
index 0000000..e0695f6
--- /dev/null
+++ b/tests/integration/PostQueryRouterCopyTest.php
@@ -0,0 +1,126 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Routed searches filter status and sort by date on the flat table's
+ * post_status / post_date copies (O-1), when those copies are trustworthy.
+ */
+class PostQueryRouterCopyTest extends TestCase {
+
+	private const TABLE = 'wp_itest_wpdo_post_rc_core';
+	private const ALIAS = '`wpdoflat_rc_item_rc_core`';
+
+	public static function setUpBeforeClass(): void {
+		$base = WPDO_PLUGIN_DIR;
+		foreach ( array(
+			'includes/adapters/interface-entity-adapter.php',
+			'includes/engine/class-tmdo-entity-registry.php',
+			'includes/engine/class-tmdo-mode-manager.php',
+			'includes/engine/class-tmdo-schema-manager.php',
+			'includes/adapters/class-tmdo-adapter-post.php',
+			'includes/integrations/class-tmdo-post-fields.php',
+			'includes/engine/class-tmdo-post-status-sync.php',
+			'includes/query/class-tmdo-post-query-router.php',
+		) as $file ) {
+			require_once $base . $file;
+		}
+	}
+
+	protected function setUp(): void {
+		global $wpdb;
+		$wpdb->query( 'DROP TABLE IF EXISTS `' . self::TABLE . '`' );
+		$wpdb->query( 'CREATE TABLE `' . self::TABLE . "` ( id BIGINT NOT NULL AUTO_INCREMENT, post_id BIGINT NOT NULL, rc_price DECIMAL(18,6) DEFAULT NULL, post_status VARCHAR(20) DEFAULT NULL, post_date DATETIME DEFAULT NULL, PRIMARY KEY (id), UNIQUE KEY uk_entity (post_id), KEY idx_post_status_date (post_status, post_date) ) ENGINE=InnoDB" );
+		$wpdb->query( 'INSERT INTO `' . self::TABLE . "` (post_id, rc_price, post_status, post_date) VALUES (1, 10, 'publish', '2026-01-01 00:00:00')" );
+
+		$GLOBALS['_wp_options']  = array( TMDO_Post_Status_Sync::OPTION => array( 'rc_core' => 'ready' ) );
+		$GLOBALS['_wp_is_admin'] = false;
+		$ref                     = new ReflectionProperty( WPDO_Schema_Manager::class, 'table_exists_cache' );
+		$ref->setAccessible( true );
+		$ref->setValue( null, array() );
+		$mode = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );
+		$mode->setAccessible( true );
+		$mode->setValue( null, array( 'post' => 'aeav_only', 'user' => 'disabled', 'term' => 'disabled', 'comment' => 'disabled' ) );
+		TMDO_Post_Query_Router::flush_copy_cache();
+
+		WPDO_Entity_Registry::init();
+		WPDO_Entity_Registry::register_adapter( 'post', new WPDO_Adapter_Post() );
+		WPDO_Entity_Registry::register_group( 'post', 'rc_core', array( array( 'key' => 'rc_price', 'type' => 'decimal' ) ), array( 'post_types' => array( 'rc_item' ) ) );
+	}
+
+	protected function tearDown(): void {
+		global $wpdb;
+		$wpdb->query( 'DROP TABLE IF EXISTS `' . self::TABLE . '`' );
+		WPDO_Entity_Registry::init();
+		$mode = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );
+		$mode->setAccessible( true );
+		$mode->setValue( null, null );
+	}
+
+	/** @return array{join:string, where:string, orderby:string, groupby:string} */
+	private function sql( array $vars ): array {
+		$query = new WP_Query();
+		foreach ( array_merge(
+			array(
+				'post_type'   => 'rc_item',
+				'post_status' => 'publish',
+				'meta_query'  => array( array( 'key' => 'rc_price', 'value' => array( 5, 20 ), 'compare' => 'BETWEEN' ) ),
+			),
+			$vars
+		) as $k => $v ) {
+			$query->set( $k, $v );
+		}
+		$router = new TMDO_Post_Query_Router();
+		$router->pre_get_posts( $query );
+		return array(
+			'join'    => $router->posts_join( '', $query ),
+			'where'   => $router->posts_where( " AND wp_posts.post_status = 'publish'", $query ),
+			'orderby' => $router->posts_orderby( 'wp_posts.post_date DESC', $query ),
+			'groupby' => $router->posts_groupby( '', $query ),
+		);
+	}
+
+	private function assert_legacy_shape( array $sql ): void {
+		$this->assertStringContainsString( 'LEFT JOIN', $sql['join'] );
+		$this->assertStringNotContainsString( self::ALIAS . '.`post_status`', $sql['where'] );
+		$this->assertSame( 'wp_posts.post_date DESC', $sql['orderby'] );
+		$this->assertSame( '`wp_itest_posts`.`ID`', $sql['groupby'] );
+	}
+
+	public function test_ready_copies_filter_status_and_order_by_date_on_the_flat_table(): void {
+		$sql = $this->sql( array( 'order' => 'ASC' ) );
+
+		$this->assertStringContainsString( 'INNER JOIN', $sql['join'] );
+		$this->assertStringContainsString( self::ALIAS . ".`post_status` IN ('publish')", $sql['where'] );
+		$this->assertStringContainsString( "wp_posts.post_status = 'publish'", $sql['where'], 'WordPress status clause stays' );
+		$this->assertSame( self::ALIAS . '.`post_date` ASC', $sql['orderby'] );
+		$this->assertSame( '', $sql['groupby'], 'one row per post: no GROUP BY, so LIMIT can stop early' );
+	}
+
+	public function test_several_explicit_statuses_are_kept(): void {
+		$sql = $this->sql( array( 'post_status' => array( 'publish', 'private' ), 'orderby' => 'date' ) );
+
+		$this->assertStringContainsString( self::ALIAS . ".`post_status` IN ('publish','private')", $sql['where'] );
+		$this->assertSame( self::ALIAS . '.`post_date` DESC', $sql['orderby'] );
+	}
+
+	public function test_copies_not_marked_ready_keep_the_legacy_shape(): void {
+		$GLOBALS['_wp_options'] = array( TMDO_Post_Status_Sync::OPTION => array( 'rc_core' => 'columns' ) );
+
+		$this->assert_legacy_shape( $this->sql( array() ) );
+	}
+
+	public function test_rows_with_missing_copies_keep_the_legacy_shape(): void {
+		global $wpdb;
+		$wpdb->query( 'INSERT INTO `' . self::TABLE . '` (post_id, rc_price) VALUES (2, 12)' );
+
+		$this->assert_legacy_shape( $this->sql( array() ) );
+	}
+
+	public function test_other_orderings_or_implicit_statuses_keep_the_legacy_shape(): void {
+		$this->assert_legacy_shape( $this->sql( array( 'orderby' => 'title' ) ) );
+		$this->assert_legacy_shape( $this->sql( array( 'post_status' => '' ) ) );
+		$this->assert_legacy_shape( $this->sql( array( 'post_status' => 'any' ) ) );
+	}
+}