update

migrations/20260226_create_lesson_stories.sql

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+-- Migration: Create lesson_stories pivot table
+-- Description: N-N relationship between Lessons and Stories
+-- Date: 2026-02-26
+
+CREATE TABLE IF NOT EXISTS `lesson_stories` (
+  `id` CHAR(36) NOT NULL PRIMARY KEY,
+  `lesson_id` CHAR(36) NOT NULL,
+  `story_id` CHAR(36) NOT NULL,
+  `display_order` INT DEFAULT 0 COMMENT 'Thứ tự hiển thị story trong lesson',
+  `is_required` BOOLEAN DEFAULT TRUE COMMENT 'Story này có bắt buộc hoàn thành không',
+  `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  
+  -- Indexes
+  INDEX `idx_lesson_id` (`lesson_id`),
+  INDEX `idx_story_id` (`story_id`),
+  INDEX `idx_display_order` (`display_order`),
+  
+  -- Unique constraint to prevent duplicate relationships
+  UNIQUE KEY `unique_lesson_story` (`lesson_id`, `story_id`),
+  
+  -- Foreign keys
+  CONSTRAINT `fk_lesson_stories_lesson`
+    FOREIGN KEY (`lesson_id`)
+    REFERENCES `lessons` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE,
+    
+  CONSTRAINT `fk_lesson_stories_story`
+    FOREIGN KEY (`story_id`)
+    REFERENCES `stories` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
+COMMENT='Pivot table for N-N relationship between Lessons and Stories';