diff --git a/src/datasources/product-api.ts b/src/datasources/product-api.ts
index b695a8b..0fa57fc 100644
--- a/src/datasources/product-api.ts
+++ b/src/datasources/product-api.ts
@@ -962,7 +962,17 @@ export class ProductAPI extends BaseSQLDataSource {
         .filter(Boolean)[0]; // Remove falsy
     }
 
-    // Delete all prior interiors
+    // Get the mapping of interior_id to roomtype_id before delete
+    // This data will be lost when we delete from interiors due to CASCADE
+    const priorRoomtypes = await this.knex.raw(
+      `SELECT irt.interior_id, irt.roomtype_id
+       FROM interiors_roomtypes irt
+       INNER JOIN interiors i ON i.id = irt.interior_id
+       WHERE i.print_id = ?`,
+      [insertPrintId],
+    );
+
+    // Delete all prior interiors (this will cascade delete interiors_roomtypes)
     await this.knex.raw(`DELETE FROM interiors WHERE print_id = ?`, [
       insertPrintId,
     ]);
@@ -987,7 +997,28 @@ export class ProductAPI extends BaseSQLDataSource {
       }
     });
 
-    return Promise.all(insertPromises);
+    // Wait for all interiors to be inserted first
+    await Promise.all(insertPromises);
+
+    // Re-insert the roomtypes for custom interiors that preserved their IDs
+    // Custom interiors keep their ID on re-insertion (line with item.id above)
+    const roomtypesPromises = [];
+    for (const priorRoomtype of priorRoomtypes.rows) {
+      // Check if this interior_id still exists (custom interiors preserve their ID)
+      const interiorStillExists = insertRegistry.some(
+        (item) => item.id === priorRoomtype.interior_id,
+      );
+      if (interiorStillExists) {
+        roomtypesPromises.push(
+          this.knex.raw(
+            `INSERT INTO interiors_roomtypes (interior_id, roomtype_id) VALUES (?, ?)`,
+            [priorRoomtype.interior_id, priorRoomtype.roomtype_id],
+          ),
+        );
+      }
+    }
+
+    return Promise.all(roomtypesPromises);
   }
 
   /**