Use CREATE TABLE IF NOT EXISTS and full DROP coverage in database_schema.sql

backend/database_schema.sql

@@ -8,13 +8,15 @@ SET FOREIGN_KEY_CHECKS = 0;
 
 -- ------------------------------------------------------------------------------
 -- DROP ALL EXISTING TABLES IN REVERSE ORDER TO PREVENT FOREIGN KEY CONFLICTS
+-- ------------------------------------------------------------------------------
+DROP TABLE IF EXISTS `chat_messages`;
+DROP TABLE IF EXISTS `student_mastery_analytics`;
 DROP TABLE IF EXISTS `student_question_answers`;
 DROP TABLE IF EXISTS `exam_attempts`;
 DROP TABLE IF EXISTS `question_options`;
 DROP TABLE IF EXISTS `questions`;
 DROP TABLE IF EXISTS `exams`;
 DROP TABLE IF EXISTS `quizzes`;
-DROP TABLE IF EXISTS `chat_messages`;
 DROP TABLE IF EXISTS `otp_verifications`;
 DROP TABLE IF EXISTS `user_devices`;
 DROP TABLE IF EXISTS `voice_notes`;
@@ -31,7 +33,7 @@ DROP TABLE IF EXISTS `schools`;
 -- ------------------------------------------------------------------------------
 -- 1. Table: schools (المدارس والجهات الشريكة - B2B مثل الثقافة العسكرية)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `schools` (
+CREATE TABLE IF NOT EXISTS `schools` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `name` VARCHAR(255) NOT NULL,
@@ -50,7 +52,7 @@ CREATE TABLE `schools` (
 -- ------------------------------------------------------------------------------
 -- 2. Table: users (المستخدمون الموحدون - طلاب، معلمون، أولياء أمور، إدارة)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `users` (
+CREATE TABLE IF NOT EXISTS `users` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `full_name` TEXT NOT NULL,
@@ -75,7 +77,7 @@ CREATE TABLE `users` (
 -- ------------------------------------------------------------------------------
 -- 3. Table: guardian_student (ربط أولياء الأمور بالأبناء - N:M)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `guardian_student` (
+CREATE TABLE IF NOT EXISTS `guardian_student` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `guardian_id` BIGINT UNSIGNED NOT NULL,
   `student_id` BIGINT UNSIGNED NOT NULL,
@@ -92,7 +94,7 @@ CREATE TABLE `guardian_student` (
 -- ------------------------------------------------------------------------------
 -- 4. Table: teacher_profiles (ملفات المعلمين ونسب الأرباح)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `teacher_profiles` (
+CREATE TABLE IF NOT EXISTS `teacher_profiles` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `user_id` BIGINT UNSIGNED NOT NULL,
   `bio` TEXT DEFAULT NULL,
@@ -109,7 +111,7 @@ CREATE TABLE `teacher_profiles` (
 -- ------------------------------------------------------------------------------
 -- 5. Table: subjects (المواد التعليمية)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `subjects` (
+CREATE TABLE IF NOT EXISTS `subjects` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `name` VARCHAR(150) NOT NULL,
   `code` VARCHAR(50) NOT NULL UNIQUE,
@@ -122,7 +124,7 @@ CREATE TABLE `subjects` (
 -- ------------------------------------------------------------------------------
 -- 6. Table: courses (الدورات التدريبية)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `courses` (
+CREATE TABLE IF NOT EXISTS `courses` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `subject_id` BIGINT UNSIGNED NOT NULL,
@@ -146,7 +148,7 @@ CREATE TABLE `courses` (
 -- ------------------------------------------------------------------------------
 -- 7. Table: lessons (الدروس والفيديوهات المربوطة بـ Bunny Stream)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `lessons` (
+CREATE TABLE IF NOT EXISTS `lessons` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `course_id` BIGINT UNSIGNED NOT NULL,
   `title` VARCHAR(255) NOT NULL,
@@ -164,7 +166,7 @@ CREATE TABLE `lessons` (
 -- ------------------------------------------------------------------------------
 -- 8. Table: exams (الامتحانات الشاملة: درس، وحدة، فصل، ومحاكاة وزاري)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `exams` (
+CREATE TABLE IF NOT EXISTS `exams` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `course_id` BIGINT UNSIGNED NOT NULL,
@@ -197,7 +199,7 @@ CREATE TABLE `exams` (
 -- ------------------------------------------------------------------------------
 -- 9. Table: questions (الأسئلة والتحليل المعرفي للذكاء الاصطناعي)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `questions` (
+CREATE TABLE IF NOT EXISTS `questions` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `exam_id` BIGINT UNSIGNED NOT NULL,
@@ -219,7 +221,7 @@ CREATE TABLE `questions` (
 -- ------------------------------------------------------------------------------
 -- 10. Table: question_options (خيارات الإجابة والتغذية الراجعة)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `question_options` (
+CREATE TABLE IF NOT EXISTS `question_options` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `question_id` BIGINT UNSIGNED NOT NULL,
   `option_text` TEXT NOT NULL,
@@ -233,7 +235,7 @@ CREATE TABLE `question_options` (
 -- ------------------------------------------------------------------------------
 -- 11. Table: exam_attempts (محاولات ونتائج الامتحانات وتحليل الذكاء الاصطناعي)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `exam_attempts` (
+CREATE TABLE IF NOT EXISTS `exam_attempts` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `student_id` BIGINT UNSIGNED NOT NULL,
@@ -259,7 +261,7 @@ CREATE TABLE `exam_attempts` (
 -- ------------------------------------------------------------------------------
 -- 12. Table: student_question_answers (تفاصيل إجابات الطالب على كل سؤال)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `student_question_answers` (
+CREATE TABLE IF NOT EXISTS `student_question_answers` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `attempt_id` BIGINT UNSIGNED NOT NULL,
   `student_id` BIGINT UNSIGNED NOT NULL,
@@ -282,7 +284,7 @@ CREATE TABLE `student_question_answers` (
 -- ------------------------------------------------------------------------------
 -- 13. Table: student_mastery_analytics (مؤشر الفهم التراكمي والجاهزية للوزاري)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `student_mastery_analytics` (
+CREATE TABLE IF NOT EXISTS `student_mastery_analytics` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `student_id` BIGINT UNSIGNED NOT NULL,
   `course_id` BIGINT UNSIGNED NOT NULL,
@@ -305,9 +307,9 @@ CREATE TABLE `student_mastery_analytics` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- ------------------------------------------------------------------------------
--- 11. Table: lesson_progress (سجل متابعة ونبض المشاهدة)
+-- 14. Table: lesson_progress (سجل متابعة ونبض المشاهدة)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `lesson_progress` (
+CREATE TABLE IF NOT EXISTS `lesson_progress` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `user_id` BIGINT UNSIGNED NOT NULL,
   `lesson_id` BIGINT UNSIGNED NOT NULL,
@@ -324,9 +326,9 @@ CREATE TABLE `lesson_progress` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- ------------------------------------------------------------------------------
--- 12. Table: voice_notes (الملاحظات الصوتية والتفريغ الذكي)
+-- 15. Table: voice_notes (الملاحظات الصوتية والتفريغ الذكي)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `voice_notes` (
+CREATE TABLE IF NOT EXISTS `voice_notes` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `user_id` BIGINT UNSIGNED NOT NULL,
@@ -344,9 +346,9 @@ CREATE TABLE `voice_notes` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- ------------------------------------------------------------------------------
--- 13. Table: user_devices (بصمة الأجهزة المربوطة بالجلسات)
+-- 16. Table: user_devices (بصمة الأجهزة المربوطة بالجلسات)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `user_devices` (
+CREATE TABLE IF NOT EXISTS `user_devices` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `user_id` BIGINT UNSIGNED NOT NULL,
   `device_fingerprint` VARCHAR(64) NOT NULL,
@@ -361,9 +363,9 @@ CREATE TABLE `user_devices` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- ------------------------------------------------------------------------------
--- 14. Table: otp_verifications (رموز التحقق عبر منصة صقل)
+-- 17. Table: otp_verifications (رموز التحقق عبر منصة صقل)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `otp_verifications` (
+CREATE TABLE IF NOT EXISTS `otp_verifications` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `phone_hash` VARCHAR(64) NOT NULL,
   `otp_code_hash` VARCHAR(255) NOT NULL,
@@ -376,9 +378,9 @@ CREATE TABLE `otp_verifications` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- ------------------------------------------------------------------------------
--- 15. Table: chat_messages (المحادثات المباشرة بين الطلاب والمعلمين)
+-- 18. Table: chat_messages (المحادثات المباشرة بين الطلاب والمعلمين)
 -- ------------------------------------------------------------------------------
-CREATE TABLE `chat_messages` (
+CREATE TABLE IF NOT EXISTS `chat_messages` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `uuid` CHAR(36) NOT NULL,
   `sender_id` BIGINT UNSIGNED NOT NULL,