diff --git a/includes/hivepress/adapters/class-tmdo-hivepress-bookings-adapter.php b/includes/hivepress/adapters/class-tmdo-hivepress-bookings-adapter.php
index 60cfaa1..a30a5e7 100644
--- a/includes/hivepress/adapters/class-tmdo-hivepress-bookings-adapter.php
+++ b/includes/hivepress/adapters/class-tmdo-hivepress-bookings-adapter.php
@@ -8,18 +8,13 @@
  * Booking model (post_type=hp_booking) — fields are best-effort from the
  * addon's documented field aliases:
  *
- *   start_time / end_time   → unix timestamp range queries (hot)
- *   status                  → enum filter (hot)
- *   quantity                → places booked, hp_quantity (hot for slot-availability;
- *                             only written when "Allow multiple places" is on)
+ *   start_time / end_time   → unix timestamp range queries
+ *   quantity                → places booked, hp_quantity (only written when
+ *                             "Allow multiple places" is on)
  *   listing                 → post_parent (already a posts column)
  *
- * Hot-zone target: `wp_wpdo_hot_hp_booking` with covering indexes on
- * `(listing_id, start_time)` for slot-availability queries and
- * `(status, start_time)` for vendor dashboard listings.
- *
- * The schema MAY drift from real Booking model when the addon is finally
- * installed; reconcile with `wp wpdo doctor` then.
+ * These keys are flattened by the `hp_booking_core` entity group
+ * (TMDO_HivePress_Entity_Groups); the adapter registers no zone fields.
  *
  * @package WP_Data_Optimizer
  * @since   3.0.0
@@ -65,73 +60,6 @@ if ( ! class_exists( 'TMDO_HivePress_Bookings_Adapter' ) ) {
 			return '1.0.0';
 		}
 
-		/**
-		 * Register hot fields for hp_booking post type.
-		 *
-		 * @param TMDO_Schema_Registry $registry Schema registry singleton.
-		 */
-		public function on_register_fields( TMDO_Schema_Registry $registry ): void {
-			$registry->register_many(
-				$this->plugin_slug(),
-				array(
-					array(
-						'post_type' => 'hp_booking',
-						'meta_key'  => 'hp_start_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_start_time',
-						'indexed'   => true,
-					),
-					array(
-						'post_type' => 'hp_booking',
-						'meta_key'  => 'hp_end_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_end_time',
-						'indexed'   => true,
-					),
-					array(
-						'post_type' => 'hp_booking',
-						'meta_key'  => 'hp_quantity',
-						'zone'      => 'hot',
-						'data_type' => 'int(11) NOT NULL DEFAULT 0',
-						'column'    => 'hp_quantity',
-						'indexed'   => false,
-					),
-				)
-			);
-		}
-
-		/**
-		 * Doctor probe — verify hot table when addon is active.
-		 *
-		 * @return array{ok:bool, message:string}
-		 */
-		public function doctor_check(): array {
-			global $wpdb;
-			if ( ! isset( $wpdb ) || ! is_object( $wpdb ) ) {
-				return array(
-					'ok'      => false,
-					'message' => 'wpdb global not available',
-				);
-			}
-			$table = $wpdb->prefix . 'wpdo_hot_hp_booking';
-			try {
-				$exists = (bool) $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table ) );
-				return array(
-					'ok'      => $exists,
-					'message' => $exists
-						? sprintf( 'hivepress-bookings: %s present', $table )
-						: sprintf( 'hivepress-bookings: %s missing (addon installed but not migrated)', $table ),
-				);
-			} catch ( \Throwable $e ) {
-				return array(
-					'ok'      => false,
-					'message' => sprintf( 'hivepress-bookings doctor failed: %s', $e->getMessage() ),
-				);
-			}
-		}
-
 		/**
 		 * 8-D self-score.
 		 *
@@ -146,15 +74,6 @@ if ( ! class_exists( 'TMDO_HivePress_Bookings_Adapter' ) ) {
 				)
 			);
 		}
-
-		/**
-		 * FSM modules this adapter contributes.
-		 *
-		 * @return array<int,string>
-		 */
-		public function migrations(): array {
-			return array( 'hot_hp_booking' );
-		}
 	}
 
 } // end if ( ! class_exists )
diff --git a/includes/hivepress/adapters/class-tmdo-hivepress-core-adapter.php b/includes/hivepress/adapters/class-tmdo-hivepress-core-adapter.php
index 1580f78..9326ee2 100644
--- a/includes/hivepress/adapters/class-tmdo-hivepress-core-adapter.php
+++ b/includes/hivepress/adapters/class-tmdo-hivepress-core-adapter.php
@@ -4,13 +4,14 @@
  *
  * Covers the primary HivePress models:
  *
- *   - `Listing` (post_type=hp_listing) — Hot zone columns for search/filter
- *     (drafted, featured, verified, expired_time, featured_time).
- *   - `Vendor`  (post_type=hp_vendor)  — Hot column `verified`; cold blob
- *     for image / description (display-only).
+ *   - `Listing` (post_type=hp_listing) — cold blob for the gallery.
+ *   - `Vendor`  (post_type=hp_vendor)  — cold blob for the image.
  *   - `User`    (entity=user)          — no zone fields; its `hp_user`
  *     entity group is registered by TMDO_HivePress_Entity_Groups.
  *
+ * Search/filter keys are flattened by TMDO_HivePress_Entity_Groups
+ * (ADR-003: no Hot zone fields).
+ *
  * This adapter SUPERSEDES the legacy `class-tmdo-hivepress.php` (242 lines).
  * Behavioural parity:
  *
@@ -23,11 +24,6 @@
  *     adapter only registers `hivepress` core fields.
  *   - Vendor cold fields (`hp_image`, `hp_images`) — preserved.
  *
- * NEW additions vs legacy:
- *
- *   - `hp_drafted` (Listing) — Hot tinyint(1) for user-dashboard filtering.
- *   - `hp_expired_time` / `hp_featured_time` (Listing) — Hot bigint indexed
- *     for cron expiry scan acceleration (replaces postmeta full scan).
  *   (This adapter used to register a second `hp_user` definition —
  *   hp_verified / hp_avatar_id, keys HivePress never writes — which the
  *   registry silently dropped; TMDO_HivePress_Entity_Groups owns it now.)
@@ -114,37 +110,10 @@ if ( ! class_exists( 'TMDO_HivePress_Core_Adapter' ) ) {
 		 * @param TMDO_Schema_Registry $registry Schema registry singleton.
 		 */
 		public function on_register_fields( TMDO_Schema_Registry $registry ): void {
-			// ── Listing hot fields (search/filter accelerators) ──
+			// ── Cold blobs (display-only) ──
 			$registry->register_many(
 				$this->plugin_slug(),
 				array(
-					// Drafted — used in user dashboard "my drafts" filter.
-					array(
-						'post_type' => 'hp_listing',
-						'meta_key'  => 'hp_drafted',
-						'zone'      => 'hot',
-						'data_type' => 'tinyint(1) NOT NULL DEFAULT 0',
-						'column'    => 'hp_drafted',
-						'indexed'   => true,
-					),
-					// Expired time — replaces `meta_query` clause in hourly cron.
-					array(
-						'post_type' => 'hp_listing',
-						'meta_key'  => 'hp_expired_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_expired_time',
-						'indexed'   => true,
-					),
-					// Featured time — same expiry pattern as above.
-					array(
-						'post_type' => 'hp_listing',
-						'meta_key'  => 'hp_featured_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_featured_time',
-						'indexed'   => true,
-					),
 					// Vendor cold blob — image attachment id (display-only).
 					array(
 						'post_type'   => 'hp_vendor',
@@ -276,57 +245,6 @@ if ( ! class_exists( 'TMDO_HivePress_Core_Adapter' ) ) {
 
 		// ── Doctor / score / migrations ────────────────────────────────────
 
-		/**
-		 * Health probe: verify hot tables exist + sample row count.
-		 *
-		 * @return array{ok:bool, message:string, details?:array<string,mixed>}
-		 */
-		public function doctor_check(): array {
-			global $wpdb;
-			if ( ! isset( $wpdb ) || ! is_object( $wpdb ) ) {
-				return array(
-					'ok'      => false,
-					'message' => 'wpdb global not available',
-				);
-			}
-
-			$details = array();
-			$ok      = true;
-			foreach ( self::HOT_MODELS as $post_type ) {
-				$table = $wpdb->prefix . 'wpdo_hot_' . sanitize_key( $post_type );
-				try {
-					$exists                = (bool) $wpdb->get_var(
-						$wpdb->prepare( 'SHOW TABLES LIKE %s', $table )
-					);
-					$details[ $post_type ] = array(
-						'table'  => $table,
-						'exists' => $exists,
-					);
-					if ( $exists ) {
-						$details[ $post_type ]['rows'] = (int) $wpdb->get_var(
-							"SELECT COUNT(*) FROM `{$table}`" // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Sanitized via sanitize_key + wpdb prefix.
-						);
-					} else {
-						$ok = false;
-					}
-				} catch ( \Throwable $e ) {
-					$details[ $post_type ] = array(
-						'table' => $table,
-						'error' => $e->getMessage(),
-					);
-					$ok                    = false;
-				}
-			}
-
-			return array(
-				'ok'      => $ok,
-				'message' => $ok
-					? 'hivepress core: hot tables OK'
-					: 'hivepress core: one or more hot tables missing or unreadable',
-				'details' => $details,
-			);
-		}
-
 		/**
 		 * 8-dimension self-score for the core adapter.
 		 *
@@ -348,18 +266,6 @@ if ( ! class_exists( 'TMDO_HivePress_Core_Adapter' ) ) {
 				)
 			);
 		}
-
-		/**
-		 * FSM modules this adapter contributes.
-		 *
-		 * @return array<int,string>
-		 */
-		public function migrations(): array {
-			return array(
-				'hot_hp_listing',
-				'hot_hp_vendor',
-			);
-		}
 	}
 
 } // end if ( ! class_exists )
diff --git a/includes/hivepress/adapters/class-tmdo-hivepress-marketplace-adapter.php b/includes/hivepress/adapters/class-tmdo-hivepress-marketplace-adapter.php
index f5042b2..316f5d7 100644
--- a/includes/hivepress/adapters/class-tmdo-hivepress-marketplace-adapter.php
+++ b/includes/hivepress/adapters/class-tmdo-hivepress-marketplace-adapter.php
@@ -4,7 +4,9 @@
  *
  * The marketplace addon turns listings into purchasable items, integrating
  * with WooCommerce. Its filterable, sortable listing attribute `price` is
- * stored as `hp_price` → decimal(10,2), used in price-range filters (HOT).
+ * stored as `hp_price` → decimal(10,2), used in price-range filters. It is
+ * flattened by the `hp_listing_core` entity group
+ * (TMDO_HivePress_Entity_Groups); the adapter registers no zone fields.
  *
  * Its other listing attributes (price tiers / extras / discounts, quantity,
  * subscription period, …) are not search filters, and it keeps no per-listing
@@ -57,57 +59,6 @@ if ( ! class_exists( 'TMDO_HivePress_Marketplace_Adapter' ) ) {
 			return '1.0.0';
 		}
 
-		/**
-		 * Register marketplace hot fields on the listing post type.
-		 *
-		 * @param TMDO_Schema_Registry $registry Schema registry singleton.
-		 */
-		public function on_register_fields( TMDO_Schema_Registry $registry ): void {
-			$registry->register_many(
-				$this->plugin_slug(),
-				array(
-					array(
-						'post_type' => 'hp_listing',
-						'meta_key'  => 'hp_price',
-						'zone'      => 'hot',
-						'data_type' => 'decimal(10,2) DEFAULT NULL',
-						'column'    => 'hp_price',
-						'indexed'   => true,
-					),
-				)
-			);
-		}
-
-		/**
-		 * Doctor probe — verify hot column exists on listing hot table.
-		 *
-		 * @return array{ok:bool, message:string}
-		 */
-		public function doctor_check(): array {
-			global $wpdb;
-			if ( ! isset( $wpdb ) || ! is_object( $wpdb ) ) {
-				return array(
-					'ok'      => false,
-					'message' => 'wpdb global not available',
-				);
-			}
-			$table = $wpdb->prefix . 'wpdo_hot_hp_listing';
-			try {
-				$exists = (bool) $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table ) );
-				return array(
-					'ok'      => $exists,
-					'message' => $exists
-						? 'hivepress-marketplace: shares wp_wpdo_hot_hp_listing'
-						: 'hivepress-marketplace: hot listing table missing',
-				);
-			} catch ( \Throwable $e ) {
-				return array(
-					'ok'      => false,
-					'message' => sprintf( 'hivepress-marketplace doctor failed: %s', $e->getMessage() ),
-				);
-			}
-		}
-
 		/**
 		 * 8-D self-score.
 		 *
diff --git a/includes/hivepress/adapters/class-tmdo-hivepress-memberships-adapter.php b/includes/hivepress/adapters/class-tmdo-hivepress-memberships-adapter.php
index e6a2b2e..14a50dc 100644
--- a/includes/hivepress/adapters/class-tmdo-hivepress-memberships-adapter.php
+++ b/includes/hivepress/adapters/class-tmdo-hivepress-memberships-adapter.php
@@ -5,18 +5,13 @@
  * Two post-type models:
  *
  *   - Membership_Plan (post_type=hp_membership_plan)
- *       hot fields: hp_expire_period (int), hp_primary (bool)
+ *       hp_expire_period (int), hp_primary (bool)
  *
  *   - Membership      (post_type=hp_membership)
- *       hot fields: hp_expired_time (unix ts) — checked on every page load
+ *       hp_expired_time (unix ts) — checked on every page load
  *
- * Both fields registered to Hot zone so:
- *   - `hp_expired_time < NOW()` lookups become indexed range scans
- *     (replaces O(N) postmeta scan on each request).
- *   - `hp_primary = 1` lookups for "default plan" become O(1).
- *
- * Tables `wp_wpdo_hot_hp_membership_plan` and `wp_wpdo_hot_hp_membership`
- * are created by `TMDO_Schema_Manager` from the registered hot columns.
+ * Flattened by the `hp_membership_plan_core` / `hp_membership_core` entity
+ * groups (TMDO_HivePress_Entity_Groups); the adapter registers no zone fields.
  *
  * @package WP_Data_Optimizer
  * @since   3.0.0
@@ -62,81 +57,6 @@ if ( ! class_exists( 'TMDO_HivePress_Memberships_Adapter' ) ) {
 			return '2.0.0';
 		}
 
-		/**
-		 * Register hot fields for both post types.
-		 *
-		 * @param TMDO_Schema_Registry $registry Schema registry singleton.
-		 */
-		public function on_register_fields( TMDO_Schema_Registry $registry ): void {
-			$registry->register_many(
-				$this->plugin_slug(),
-				array(
-					// Plan fields.
-					array(
-						'post_type' => 'hp_membership_plan',
-						'meta_key'  => 'hp_expire_period',
-						'zone'      => 'hot',
-						'data_type' => 'int(11) NOT NULL DEFAULT 0',
-						'column'    => 'hp_expire_period',
-						'indexed'   => false,
-					),
-					array(
-						'post_type' => 'hp_membership_plan',
-						'meta_key'  => 'hp_primary',
-						'zone'      => 'hot',
-						'data_type' => 'tinyint(1) NOT NULL DEFAULT 0',
-						'column'    => 'hp_primary',
-						'indexed'   => true,
-					),
-					// Membership (subscription) field — hottest path: every page load.
-					array(
-						'post_type' => 'hp_membership',
-						'meta_key'  => 'hp_expired_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_expired_time',
-						'indexed'   => true,
-					),
-				)
-			);
-		}
-
-		/**
-		 * Doctor probe — verify both hot tables.
-		 *
-		 * @return array{ok:bool, message:string, details?:array<string,mixed>}
-		 */
-		public function doctor_check(): array {
-			global $wpdb;
-			if ( ! isset( $wpdb ) || ! is_object( $wpdb ) ) {
-				return array(
-					'ok'      => false,
-					'message' => 'wpdb global not available',
-				);
-			}
-			$details = array();
-			$ok      = true;
-			foreach ( array( 'hp_membership_plan', 'hp_membership' ) as $pt ) {
-				$table = $wpdb->prefix . 'wpdo_hot_' . sanitize_key( $pt );
-				try {
-					$exists                   = (bool) $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table ) );
-					$details[ $pt ]['table']  = $table;
-					$details[ $pt ]['exists'] = $exists;
-					if ( ! $exists ) {
-						$ok = false;
-					}
-				} catch ( \Throwable $e ) {
-					$details[ $pt ]['error'] = $e->getMessage();
-					$ok                      = false;
-				}
-			}
-			return array(
-				'ok'      => $ok,
-				'message' => $ok ? 'hivepress-memberships: hot tables OK' : 'hivepress-memberships: hot tables missing',
-				'details' => $details,
-			);
-		}
-
 		/**
 		 * 8-D self-score.
 		 *
@@ -152,18 +72,6 @@ if ( ! class_exists( 'TMDO_HivePress_Memberships_Adapter' ) ) {
 		public function suitability_score(): array {
 			return $this->compose_score( array() );
 		}
-
-		/**
-		 * FSM modules this adapter contributes.
-		 *
-		 * @return array<int,string>
-		 */
-		public function migrations(): array {
-			return array(
-				'hot_hp_membership_plan',
-				'hot_hp_membership',
-			);
-		}
 	}
 
 } // end if ( ! class_exists )
diff --git a/includes/hivepress/adapters/class-tmdo-hivepress-requests-adapter.php b/includes/hivepress/adapters/class-tmdo-hivepress-requests-adapter.php
index 4ef0b7f..903ac8e 100644
--- a/includes/hivepress/adapters/class-tmdo-hivepress-requests-adapter.php
+++ b/includes/hivepress/adapters/class-tmdo-hivepress-requests-adapter.php
@@ -5,8 +5,8 @@
  * Two related models:
  *
  *   - Request (post_type=hp_request)
- *       hot fields: hp_drafted (bool), hp_expired_time (unix ts)
- *       — same access pattern as Listing (user dashboard + expiry cron)
+ *       hp_drafted / hp_expired_time are flattened by the `hp_draft_flags`
+ *       and `hp_request_core` entity groups (TMDO_HivePress_Entity_Groups).
  *
  *   - Offer   (comment_type=hp_offer, parent post_type=hp_request)
  *       stored in comment columns only — no comment meta to flatten.
@@ -59,74 +59,6 @@ if ( ! class_exists( 'TMDO_HivePress_Requests_Adapter' ) ) {
 		public function minimum_addon_version(): string {
 			return '1.2.0';
 		}
-
-		/**
-		 * Register hot fields for hp_request post type.
-		 *
-		 * @param TMDO_Schema_Registry $registry Schema registry singleton.
-		 */
-		public function on_register_fields( TMDO_Schema_Registry $registry ): void {
-			$registry->register_many(
-				$this->plugin_slug(),
-				array(
-					array(
-						'post_type' => 'hp_request',
-						'meta_key'  => 'hp_drafted',
-						'zone'      => 'hot',
-						'data_type' => 'tinyint(1) NOT NULL DEFAULT 0',
-						'column'    => 'hp_drafted',
-						'indexed'   => true,
-					),
-					array(
-						'post_type' => 'hp_request',
-						'meta_key'  => 'hp_expired_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_expired_time',
-						'indexed'   => true,
-					),
-				)
-			);
-		}
-
-		/**
-		 * Doctor probe — request hot table.
-		 *
-		 * @return array{ok:bool, message:string, details?:array<string,mixed>}
-		 */
-		public function doctor_check(): array {
-			global $wpdb;
-			if ( ! isset( $wpdb ) || ! is_object( $wpdb ) ) {
-				return array(
-					'ok'      => false,
-					'message' => 'wpdb global not available',
-				);
-			}
-			$table = $wpdb->prefix . 'wpdo_hot_hp_request';
-			try {
-				$exists = (bool) $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table ) );
-				return array(
-					'ok'      => $exists,
-					'message' => $exists
-						? sprintf( 'hivepress-requests: %s present', $table )
-						: sprintf( 'hivepress-requests: %s missing', $table ),
-				);
-			} catch ( \Throwable $e ) {
-				return array(
-					'ok'      => false,
-					'message' => sprintf( 'hivepress-requests doctor failed: %s', $e->getMessage() ),
-				);
-			}
-		}
-
-		/**
-		 * FSM modules this adapter contributes.
-		 *
-		 * @return array<int,string>
-		 */
-		public function migrations(): array {
-			return array( 'hot_hp_request' );
-		}
 	}
 
 } // end if ( ! class_exists )
diff --git a/tests/unit/BookingsAdapterTest.php b/tests/unit/BookingsAdapterTest.php
index b0bd684..20a62ca 100644
--- a/tests/unit/BookingsAdapterTest.php
+++ b/tests/unit/BookingsAdapterTest.php
@@ -33,31 +33,6 @@ class HivePressBookingsAdapterTest extends TestCase {
 		$this->assertSame( 'HivePress\\Bookings\\Plugin', $this->adapter->detection_class() );
 	}
 
-	public function test_on_register_fields_reserves_booking_hot_columns(): void {
-		$registry = WPDO_Schema_Registry::instance();
-		$this->adapter->on_register_fields( $registry );
-
-		$start = $registry->get_field( 'hp_booking', 'hp_start_time' );
-		$this->assertSame( 'hot', $start['zone'] );
-		$this->assertTrue( (bool) $start['indexed'] );
-
-		$end = $registry->get_field( 'hp_booking', 'hp_end_time' );
-		$this->assertSame( 'hot', $end['zone'] );
-		$this->assertTrue( (bool) $end['indexed'] );
-	}
-
-	public function test_on_register_fields_uses_real_booking_meta_keys(): void {
-		$registry = WPDO_Schema_Registry::instance();
-		$this->adapter->on_register_fields( $registry );
-
-		// hivepress-bookings has no guests field; places are stored as hp_quantity.
-		$this->assertNull( $registry->get_field( 'hp_booking', 'hp_guests' ) );
-
-		$quantity = $registry->get_field( 'hp_booking', 'hp_quantity' );
-		$this->assertNotNull( $quantity );
-		$this->assertSame( 'hot', $quantity['zone'] );
-	}
-
 	public function test_score_reflects_unverified_perf_dimension(): void {
 		$score = $this->adapter->suitability_score();
 		// D8 reduced to 0.9 because schema is best-effort until addon installs.
@@ -65,8 +40,4 @@ class HivePressBookingsAdapterTest extends TestCase {
 		// Aggregate = (7 × 1.0 + 0.9) / 8 × 10 = 9.875 → 9.88.
 		$this->assertSame( 9.88, $score['aggregate'] );
 	}
-
-	public function test_migrations_lists_booking_module(): void {
-		$this->assertSame( array( 'hot_hp_booking' ), $this->adapter->migrations() );
-	}
 }
diff --git a/tests/unit/CoreAdapterTest.php b/tests/unit/CoreAdapterTest.php
index 6af0e24..5e1dc03 100644
--- a/tests/unit/CoreAdapterTest.php
+++ b/tests/unit/CoreAdapterTest.php
@@ -46,29 +46,10 @@ class HivePressCoreAdapterTest extends TestCase {
 		$this->assertSame( '1.7.0', $this->adapter->minimum_addon_version() );
 	}
 
-	public function test_migrations_returns_listing_and_vendor_modules(): void {
-		$mods = $this->adapter->migrations();
-		$this->assertContains( 'hot_hp_listing', $mods );
-		$this->assertContains( 'hot_hp_vendor', $mods );
-	}
-
 	public function test_on_register_fields_populates_schema_registry(): void {
 		$registry = WPDO_Schema_Registry::instance();
 		$this->adapter->on_register_fields( $registry );
 
-		// Listing hot fields.
-		$drafted = $registry->get_field( 'hp_listing', 'hp_drafted' );
-		$this->assertIsArray( $drafted );
-		$this->assertSame( 'hot', $drafted['zone'] );
-		$this->assertTrue( (bool) $drafted['indexed'] );
-
-		$expired = $registry->get_field( 'hp_listing', 'hp_expired_time' );
-		$this->assertSame( 'hot', $expired['zone'] );
-		$this->assertStringContainsString( 'bigint', $expired['data_type'] );
-
-		$featured_time = $registry->get_field( 'hp_listing', 'hp_featured_time' );
-		$this->assertSame( 'hot', $featured_time['zone'] );
-
 		// Vendor cold blob.
 		$vendor_image = $registry->get_field( 'hp_vendor', 'hp_image' );
 		$this->assertIsArray( $vendor_image );
@@ -87,16 +68,6 @@ class HivePressCoreAdapterTest extends TestCase {
 		}
 	}
 
-	public function test_doctor_check_reports_table_status(): void {
-		$result = $this->adapter->doctor_check();
-		$this->assertIsArray( $result );
-		$this->assertArrayHasKey( 'ok', $result );
-		$this->assertArrayHasKey( 'message', $result );
-		$this->assertArrayHasKey( 'details', $result );
-		// The stub $wpdb returns null for SHOW TABLES, so tables appear missing → ok=false.
-		$this->assertFalse( $result['ok'] );
-	}
-
 	public function test_optimize_query_extracts_hot_clauses(): void {
 		$registry = WPDO_Schema_Registry::instance();
 		$this->adapter->on_register_fields( $registry );
diff --git a/tests/unit/MarketplaceAdapterTest.php b/tests/unit/MarketplaceAdapterTest.php
index 55e93de..bd7248d 100644
--- a/tests/unit/MarketplaceAdapterTest.php
+++ b/tests/unit/MarketplaceAdapterTest.php
@@ -33,21 +33,6 @@ class HivePressMarketplaceAdapterTest extends TestCase {
 		$this->assertSame( 'HivePress\\Marketplace\\Plugin', $this->adapter->detection_class() );
 	}
 
-	public function test_on_register_fields_registers_hot_hp_price(): void {
-		$registry = WPDO_Schema_Registry::instance();
-		$this->adapter->on_register_fields( $registry );
-
-		// Marketplace's filterable, sortable listing "price" attribute is stored as hp_price.
-		$price = $registry->get_field( 'hp_listing', 'hp_price' );
-		$this->assertSame( 'hot', $price['zone'] );
-		$this->assertTrue( (bool) $price['indexed'] );
-		$this->assertStringContainsString( 'decimal', $price['data_type'] );
-
-		// Neither key exists in hivepress-marketplace.
-		$this->assertNull( $registry->get_field( 'hp_listing', 'hp_purchase_price' ) );
-		$this->assertNull( $registry->get_field( 'hp_listing', 'hp_purchase_count' ) );
-	}
-
 	public function test_score_aggregates_to_nine_eight_eight(): void {
 		// D8 = 0.9 → aggregate = (7×1.0 + 0.9)/8 × 10 = 9.875 → 9.88.
 		$this->assertSame( 9.88, $this->adapter->suitability_score()['aggregate'] );
diff --git a/tests/unit/MembershipsAdapterTest.php b/tests/unit/MembershipsAdapterTest.php
index fe039a1..8a6e038 100644
--- a/tests/unit/MembershipsAdapterTest.php
+++ b/tests/unit/MembershipsAdapterTest.php
@@ -33,41 +33,8 @@ class HivePressMembershipsAdapterTest extends TestCase {
 		$this->assertSame( '2.0.0', $this->adapter->minimum_addon_version() );
 	}
 
-	public function test_on_register_fields_registers_three_hot_fields(): void {
-		$registry = WPDO_Schema_Registry::instance();
-		$this->adapter->on_register_fields( $registry );
-
-		// Plan fields.
-		$expire_period = $registry->get_field( 'hp_membership_plan', 'hp_expire_period' );
-		$this->assertSame( 'hot', $expire_period['zone'] );
-		$this->assertStringContainsString( 'int', $expire_period['data_type'] );
-
-		$primary = $registry->get_field( 'hp_membership_plan', 'hp_primary' );
-		$this->assertSame( 'hot', $primary['zone'] );
-		$this->assertTrue( (bool) $primary['indexed'] );
-
-		// Membership field — the hottest path.
-		$expired = $registry->get_field( 'hp_membership', 'hp_expired_time' );
-		$this->assertSame( 'hot', $expired['zone'] );
-		$this->assertTrue( (bool) $expired['indexed'] );
-		$this->assertStringContainsString( 'bigint', $expired['data_type'] );
-	}
-
-	public function test_doctor_check_reports_missing_tables_in_stub_env(): void {
-		$result = $this->adapter->doctor_check();
-		$this->assertFalse( $result['ok'] );
-		$this->assertArrayHasKey( 'hp_membership_plan', $result['details'] );
-		$this->assertArrayHasKey( 'hp_membership', $result['details'] );
-	}
-
 	public function test_score_aggregates_to_perfect_ten(): void {
 		$score = $this->adapter->suitability_score();
 		$this->assertSame( 10.0, $score['aggregate'] );
 	}
-
-	public function test_migrations_lists_both_hot_modules(): void {
-		$mods = $this->adapter->migrations();
-		$this->assertContains( 'hot_hp_membership_plan', $mods );
-		$this->assertContains( 'hot_hp_membership', $mods );
-	}
 }
diff --git a/tests/unit/NoHotZoneRegistrationTest.php b/tests/unit/NoHotZoneRegistrationTest.php
new file mode 100644
index 0000000..3f6d2d1
--- /dev/null
+++ b/tests/unit/NoHotZoneRegistrationTest.php
@@ -0,0 +1,51 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * ADR-003: post fields converge on entity groups; the Hot zone is frozen.
+ *
+ * No HivePress adapter registers zone=hot fields or contributes hot_* FSM
+ * modules. The fields they used to cover live in TMDO_HivePress_Entity_Groups.
+ */
+class NoHotZoneRegistrationTest extends TestCase {
+
+	private const ADAPTERS = array(
+		'TMDO_HivePress_Core_Adapter',
+		'TMDO_HivePress_Requests_Adapter',
+		'TMDO_HivePress_Bookings_Adapter',
+		'TMDO_HivePress_Memberships_Adapter',
+		'TMDO_HivePress_Marketplace_Adapter',
+		'TMDO_HivePress_Favorites_Adapter',
+		'TMDO_HivePress_Reviews_Adapter',
+		'TMDO_HivePress_Social_Links_Adapter',
+		'TMDO_HivePress_Blocks_Adapter',
+		'TMDO_HivePress_Seo_Adapter',
+		'TMDO_HivePress_Messages_Adapter',
+		'TMDO_HivePress_Statistics_Adapter',
+		'TMDO_HivePress_Tags_Adapter',
+	);
+
+	protected function setUp(): void {
+		$prop = ( new ReflectionClass( TMDO_Schema_Registry::class ) )->getProperty( 'instance' );
+		$prop->setAccessible( true );
+		$prop->setValue( null, null );
+	}
+
+	public function test_no_adapter_registers_hot_fields(): void {
+		$registry = TMDO_Schema_Registry::instance();
+		foreach ( self::ADAPTERS as $class ) {
+			( new $class() )->on_register_fields( $registry );
+		}
+
+		$this->assertSame( array(), $registry->get_zone_fields( 'hot' ) );
+		$this->assertSame( 'cold', $registry->get_field_zone( 'hp_listing', 'hp_images' ), 'cold fields stay' );
+	}
+
+	public function test_no_adapter_contributes_hot_modules(): void {
+		foreach ( self::ADAPTERS as $class ) {
+			$this->assertSame( array(), ( new $class() )->migrations(), $class );
+		}
+	}
+}
diff --git a/tests/unit/RequestsAdapterTest.php b/tests/unit/RequestsAdapterTest.php
index 0c850b1..d7cf176 100644
--- a/tests/unit/RequestsAdapterTest.php
+++ b/tests/unit/RequestsAdapterTest.php
@@ -35,19 +35,6 @@ class HivePressRequestsAdapterTest extends TestCase {
 		$this->assertSame( 'hp_offer', WPDO_HivePress_Requests_Adapter::OFFER_COMMENT_TYPE );
 	}
 
-	public function test_on_register_fields_registers_request_hot_columns(): void {
-		$registry = WPDO_Schema_Registry::instance();
-		$this->adapter->on_register_fields( $registry );
-
-		$drafted = $registry->get_field( 'hp_request', 'hp_drafted' );
-		$this->assertSame( 'hot', $drafted['zone'] );
-		$this->assertTrue( (bool) $drafted['indexed'] );
-
-		$expired = $registry->get_field( 'hp_request', 'hp_expired_time' );
-		$this->assertSame( 'hot', $expired['zone'] );
-		$this->assertTrue( (bool) $expired['indexed'] );
-	}
-
 	public function test_registers_no_offer_shadow_table(): void {
 		// The offer shadow table was never created, so every mirror write failed.
 		$registry = WPDO_Custom_Table_Registry::instance();
@@ -69,8 +56,4 @@ class HivePressRequestsAdapterTest extends TestCase {
 	public function test_score_aggregates_to_perfect_ten(): void {
 		$this->assertSame( 10.0, $this->adapter->suitability_score()['aggregate'] );
 	}
-
-	public function test_migrations_lists_only_request_hot_module(): void {
-		$this->assertSame( array( 'hot_hp_request' ), $this->adapter->migrations() );
-	}
 }