make default_group as utility and added more things

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

database/migrations/20260715000003-create-certificates.js

@@ -0,0 +1,40 @@
+'use strict';
+
+// Backfill migration: this table already exists live (created outside of
+// sequelize-cli before migration coverage was complete). Written to match
+// the live CockroachDB schema exactly so a fresh install/cutover recreates
+// it. On the existing production DB, mark this filename as already applied
+// in SequelizeMeta instead of running it — see project notes.
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('certificates', {
+      certificate_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
+      uuid:           { type: Sequelize.UUID, allowNull: false, unique: true, defaultValue: Sequelize.literal('gen_random_uuid()') },
+      cert_no:        { type: Sequelize.STRING(25), allowNull: false, unique: true },
+      ref_no:         { type: Sequelize.STRING(50), allowNull: false },
+      user_id:        { type: Sequelize.BIGINT, allowNull: false, references: { model: 'users', key: 'user_id' }, onDelete: 'CASCADE' },
+      course_id:      { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
+      instructors:    { type: Sequelize.TEXT, allowNull: true },
+      score:          { type: Sequelize.BIGINT, allowNull: true },
+      length_str:     { type: Sequelize.STRING(50), allowNull: true },
+      issued_at:      { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+      created_at:     { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+      updated_at:     { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+    });
+
+    await queryInterface.addConstraint('certificates', {
+      fields: ['user_id', 'course_id'],
+      type: 'unique',
+      name: 'certificates_user_id_course_id_key',
+    });
+
+    await queryInterface.addIndex('certificates', ['course_id'], { name: 'idx_certificates_course_id' });
+    await queryInterface.addIndex('certificates', ['user_id'], { name: 'idx_certificates_user_id' });
+    await queryInterface.addIndex('certificates', ['uuid'], { name: 'idx_certificates_uuid' });
+  },
+
+  async down(queryInterface) {
+    await queryInterface.dropTable('certificates');
+  },
+};

database/migrations/20260715000004-create-course-instructors.js

@@ -0,0 +1,43 @@
+'use strict';
+
+// Backfill migration: this table already exists live (created outside of
+// sequelize-cli before migration coverage was complete). Written to match
+// the live CockroachDB schema exactly so a fresh install/cutover recreates
+// it. On the existing production DB, mark this filename as already applied
+// in SequelizeMeta instead of running it — see project notes.
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('course_instructors', {
+      id:           { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
+      course_id:    { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
+      user_id:      { type: Sequelize.BIGINT, allowNull: true, references: { model: 'users', key: 'user_id' }, onDelete: 'CASCADE' },
+      order_index:  { type: Sequelize.BIGINT, allowNull: false, defaultValue: 0 },
+      display_name: { type: Sequelize.STRING(255), allowNull: false, defaultValue: '' },
+      created_by:   { type: Sequelize.BIGINT, allowNull: true },
+      created_at:   { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+      updated_at:   { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+    });
+
+    await queryInterface.addConstraint('course_instructors', {
+      fields: ['course_id', 'user_id'],
+      type: 'unique',
+      name: 'course_instructors_course_id_user_id_key',
+    });
+
+    await queryInterface.addIndex('course_instructors', ['course_id'], { name: 'idx_course_instructors_course' });
+
+    // Partial unique index — same columns as the constraint above, scoped to
+    // non-null user_id, matching what's live. Raw SQL since queryInterface
+    // addIndex's `where` support is unreliable for IS NOT NULL across dialects.
+    await queryInterface.sequelize.query(`
+      CREATE UNIQUE INDEX idx_course_instructors_user
+      ON course_instructors (course_id, user_id)
+      WHERE user_id IS NOT NULL;
+    `);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.dropTable('course_instructors');
+  },
+};

database/migrations/20260715000005-create-quiz-sessions.js

@@ -0,0 +1,38 @@
+'use strict';
+
+// Backfill migration: this table already exists live (created outside of
+// sequelize-cli before migration coverage was complete). Written to match
+// the live CockroachDB schema exactly so a fresh install/cutover recreates
+// it. On the existing production DB, mark this filename as already applied
+// in SequelizeMeta instead of running it — see project notes.
+//
+// Note: started_at/last_saved_at/createdAt/updatedAt are TIMESTAMP WITHOUT
+// TIME ZONE live (unlike most other tables' TIMESTAMPTZ columns), so raw
+// type strings are used instead of Sequelize.DATE to match exactly.
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('quiz_sessions', {
+      session_id:    { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
+      uuid:          { type: Sequelize.UUID, allowNull: false, unique: true, defaultValue: Sequelize.literal('gen_random_uuid()') },
+      user_id:       { type: Sequelize.BIGINT, allowNull: false, references: { model: 'users', key: 'user_id' }, onDelete: 'CASCADE' },
+      quiz_id:       { type: Sequelize.BIGINT, allowNull: false, references: { model: 'unit_quizzes', key: 'quiz_id' }, onDelete: 'CASCADE' },
+      course_id:     { type: Sequelize.BIGINT, allowNull: true },
+      unit_id:       { type: Sequelize.BIGINT, allowNull: true },
+      status:        { type: Sequelize.STRING(20), allowNull: false, defaultValue: 'in_progress' },
+      draft_answers: { type: Sequelize.JSONB, allowNull: true },
+      started_at:    { type: 'TIMESTAMP', allowNull: false, defaultValue: Sequelize.NOW },
+      last_saved_at: { type: 'TIMESTAMP', allowNull: true },
+      createdAt:     { type: 'TIMESTAMP', allowNull: false, defaultValue: Sequelize.NOW },
+      updatedAt:     { type: 'TIMESTAMP', allowNull: false, defaultValue: Sequelize.NOW },
+    });
+
+    await queryInterface.addIndex('quiz_sessions', ['quiz_id'], { name: 'idx_qs_quiz_id' });
+    await queryInterface.addIndex('quiz_sessions', ['status'], { name: 'idx_qs_status' });
+    await queryInterface.addIndex('quiz_sessions', ['user_id'], { name: 'idx_qs_user_id' });
+  },
+
+  async down(queryInterface) {
+    await queryInterface.dropTable('quiz_sessions');
+  },
+};

database/migrations/20260715000006-create-user-bans.js

@@ -0,0 +1,47 @@
+'use strict';
+
+// Backfill migration: this table already exists live (created outside of
+// sequelize-cli before migration coverage was complete). Written to match
+// the live CockroachDB schema exactly so a fresh install/cutover recreates
+// it. On the existing production DB, mark this filename as already applied
+// in SequelizeMeta instead of running it — see project notes.
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('user_bans', {
+      ban_id:      { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
+      user_id:     { type: Sequelize.BIGINT, allowNull: false, references: { model: 'users', key: 'user_id' }, onDelete: 'CASCADE' },
+      banned_by:   { type: Sequelize.BIGINT, allowNull: false, references: { model: 'users', key: 'user_id' } },
+      reason:      { type: Sequelize.TEXT, allowNull: false },
+      ban_type:    { type: Sequelize.STRING(20), allowNull: false },
+      banned_at:   { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+      expires_at:  { type: Sequelize.DATE, allowNull: true },
+      is_lifted:   { type: Sequelize.BOOLEAN, allowNull: false, defaultValue: false },
+      lifted_at:   { type: Sequelize.DATE, allowNull: true },
+      lifted_by:   { type: Sequelize.BIGINT, allowNull: true, references: { model: 'users', key: 'user_id' } },
+      lift_reason: { type: Sequelize.TEXT, allowNull: true },
+      createdAt:   { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+      updatedAt:   { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
+    });
+
+    await queryInterface.addConstraint('user_bans', {
+      fields: ['ban_type'],
+      type: 'check',
+      name: 'check_ban_type',
+      where: { ban_type: { [Sequelize.Op.in]: ['temporary', 'permanent'] } },
+    });
+
+    await queryInterface.addIndex('user_bans', ['user_id'], { name: 'idx_user_bans_user_id' });
+
+    // Partial index — only rows relevant to the ban-expiry cron sweep.
+    await queryInterface.sequelize.query(`
+      CREATE INDEX idx_user_bans_expires_at
+      ON user_bans (expires_at)
+      WHERE is_lifted = false AND ban_type = 'temporary';
+    `);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.dropTable('user_bans');
+  },
+};