Implement verified curriculum, video review, watch sessions, ledger safeguards, and remove demo data

backend/migrations/20260909_payment_safety_hold.sql

@@ -0,0 +1,40 @@
+-- Payment safety hold: apply this migration before deploying the P0 payment changes.
+-- No balance is created or reconciled by this migration. Existing records remain
+-- historical evidence and must be reconciled against a real provider later.
+
+CREATE TABLE IF NOT EXISTS `cliq_payments` (
+  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+  `uuid` CHAR(36) NOT NULL UNIQUE,
+  `student_id` BIGINT UNSIGNED NOT NULL,
+  `course_id` BIGINT UNSIGNED NOT NULL,
+  `amount_jod` DECIMAL(8,2) NOT NULL,
+  `cliq_alias` VARCHAR(100) NOT NULL,
+  `reference_code` VARCHAR(50) NOT NULL UNIQUE,
+  `bank_transaction_id` VARCHAR(100) DEFAULT NULL UNIQUE,
+  `receipt_image_path` VARCHAR(500) DEFAULT NULL,
+  `verification_status` ENUM('pending','verified','rejected','manual_review') NOT NULL DEFAULT 'pending',
+  `ai_extracted_json` JSON DEFAULT NULL,
+  `verified_at` TIMESTAMP NULL DEFAULT NULL,
+  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `idx_cliq_student` (`student_id`),
+  KEY `idx_cliq_ref` (`reference_code`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS `payout_queue` (
+  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+  `uuid` CHAR(36) NOT NULL UNIQUE,
+  `teacher_id` BIGINT UNSIGNED NOT NULL,
+  `amount_jod` DECIMAL(8,2) NOT NULL,
+  `teacher_cliq_alias` VARCHAR(150) NOT NULL,
+  `status` ENUM('queued','processing','completed','failed','cancelled') NOT NULL DEFAULT 'queued',
+  `transaction_reference` VARCHAR(100) DEFAULT NULL,
+  `failure_reason` TEXT DEFAULT NULL,
+  `processed_at` TIMESTAMP NULL DEFAULT NULL,
+  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `idx_payout_teacher` (`teacher_id`),
+  KEY `idx_payout_status` (`status`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Rollback: do not drop either table. They may contain financial evidence.