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CREATE TABLE `account_to_api_registry` (
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CREATE TABLE `api_keys` (
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CREATE TABLE `api_registry` (
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CREATE TABLE `chat_messages` (
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  KEY `idx_chat_messages_rating` (`chat_messages_rating`),
  CONSTRAINT `fk_chat_messages_session` FOREIGN KEY (`chat_messages_session_id`) REFERENCES `test_sessions` (`session_id`) ON DELETE CASCADE,
  CONSTRAINT `fk_chat_messages_user` FOREIGN KEY (`chat_messages_user_id`) REFERENCES `user` (`user_id`) ON DELETE CASCADE
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CREATE TABLE `chat_shares` (
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  KEY `idx_chat_shares_session` (`chat_shares_session_id`),
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CREATE TABLE `email_notification_preferences` (
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  UNIQUE KEY `unique_user_notification_type` (`email_notification_preferences_user_id`,`email_notification_preferences_type`),
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CREATE TABLE `email_queue` (
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CREATE TABLE `email_templates` (
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  `email_templates_variables` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_bin DEFAULT NULL COMMENT 'JSON array of available template variables' CHECK (json_valid(`email_templates_variables`)),
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CREATE TABLE `gdpr_access_logs` (
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  `gdpr_access_logs_metadata` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_bin DEFAULT NULL CHECK (json_valid(`gdpr_access_logs_metadata`)),
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CREATE TABLE `gdpr_consent_records` (
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CREATE TABLE `gdpr_data_export_requests` (
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  `gdpr_data_export_requests_file_size` bigint(20) DEFAULT NULL,
  `gdpr_data_export_requests_expires_at` datetime DEFAULT NULL,
  `gdpr_data_export_requests_completed_at` datetime DEFAULT NULL,
  `gdpr_data_export_requests_created_at` datetime DEFAULT current_timestamp(),
  `gdpr_data_export_requests_updated_at` datetime DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  PRIMARY KEY (`gdpr_data_export_requests_id`),
  KEY `idx_gdpr_export_user` (`gdpr_data_export_requests_user_id`),
  KEY `idx_gdpr_export_status` (`gdpr_data_export_requests_status`),
  CONSTRAINT `fk_gdpr_data_export_requests_user` FOREIGN KEY (`gdpr_data_export_requests_user_id`) REFERENCES `user` (`user_id`) ON DELETE CASCADE
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CREATE TABLE `gdpr_deletion_requests` (
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  `gdpr_deletion_requests_status` enum('pending','grace_period','processing','completed','cancelled') DEFAULT 'pending',
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  `gdpr_deletion_requests_completed_at` datetime DEFAULT NULL,
  `gdpr_deletion_requests_cancelled_at` datetime DEFAULT NULL,
  `gdpr_deletion_requests_created_at` datetime DEFAULT current_timestamp(),
  `gdpr_deletion_requests_updated_at` datetime DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  PRIMARY KEY (`gdpr_deletion_requests_id`),
  KEY `idx_gdpr_deletion_user` (`gdpr_deletion_requests_user_id`),
  KEY `idx_gdpr_deletion_status` (`gdpr_deletion_requests_status`),
  KEY `idx_gdpr_deletion_grace` (`gdpr_deletion_requests_grace_until`),
  CONSTRAINT `fk_gdpr_deletion_requests_user` FOREIGN KEY (`gdpr_deletion_requests_user_id`) REFERENCES `user` (`user_id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;
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CREATE TABLE `handoff_messages` (
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  `handoff_messages_handoff_id` int(11) NOT NULL,
  `handoff_messages_sender_type` enum('user','agent','human') NOT NULL,
  `handoff_messages_sender_id` int(11) DEFAULT NULL,
  `handoff_messages_content` text NOT NULL,
  `handoff_messages_created_at` datetime DEFAULT current_timestamp(),
  PRIMARY KEY (`handoff_messages_id`),
  KEY `fk_handoff_messages_handoff` (`handoff_messages_handoff_id`),
  CONSTRAINT `fk_handoff_messages_handoff` FOREIGN KEY (`handoff_messages_handoff_id`) REFERENCES `handoff_requests` (`handoff_requests_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;
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CREATE TABLE `handoff_requests` (
  `handoff_requests_id` int(11) NOT NULL AUTO_INCREMENT,
  `handoff_requests_user_id` int(11) NOT NULL,
  `handoff_requests_agent_template_id` int(11) DEFAULT NULL,
  `handoff_requests_conversation_id` varchar(100) NOT NULL,
  `handoff_requests_reason` enum('user_requested','low_confidence','keyword_detected','failed_attempts','sensitive_topic') NOT NULL,
  `handoff_requests_reason_detail` text DEFAULT NULL,
  `handoff_requests_conversation_context` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_bin DEFAULT NULL CHECK (json_valid(`handoff_requests_conversation_context`)),
  `handoff_requests_status` enum('pending','assigned','in_progress','resolved','cancelled') DEFAULT 'pending',
  `handoff_requests_priority` enum('low','normal','high','urgent') DEFAULT 'normal',
  `handoff_requests_assigned_to` int(11) DEFAULT NULL,
  `handoff_requests_resolution_note` text DEFAULT NULL,
  `handoff_requests_created_at` datetime DEFAULT current_timestamp(),
  `handoff_requests_assigned_at` datetime DEFAULT NULL,
  `handoff_requests_resolved_at` datetime DEFAULT NULL,
  `handoff_requests_updated_at` datetime DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  PRIMARY KEY (`handoff_requests_id`),
  KEY `fk_handoff_requests_user` (`handoff_requests_user_id`),
  KEY `fk_handoff_requests_agent_template` (`handoff_requests_agent_template_id`),
  KEY `fk_handoff_requests_assigned_to` (`handoff_requests_assigned_to`),
  CONSTRAINT `fk_handoff_requests_agent_template` FOREIGN KEY (`handoff_requests_agent_template_id`) REFERENCES `agent_templates` (`agent_templates_id`) ON DELETE SET NULL,
  CONSTRAINT `fk_handoff_requests_assigned_to` FOREIGN KEY (`handoff_requests_assigned_to`) REFERENCES `user` (`user_id`) ON DELETE SET NULL,
  CONSTRAINT `fk_handoff_requests_user` FOREIGN KEY (`handoff_requests_user_id`) REFERENCES `user` (`user_id`) ON DELETE CASCADE
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CREATE TABLE `handoff_triggers` (
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  `handoff_triggers_name` varchar(100) NOT NULL,
  `handoff_triggers_type` enum('keyword','confidence_threshold','failed_attempts','sensitive_topic','user_request') NOT NULL,
  `handoff_triggers_config` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL CHECK (json_valid(`handoff_triggers_config`)),
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  `handoff_triggers_created_at` datetime DEFAULT current_timestamp(),
  `handoff_triggers_updated_at` datetime DEFAULT current_timestamp() ON UPDATE current_timestamp(),
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