-- Durable alert center. Apply before switching API/evaluator binaries.
CREATE TABLE IF NOT EXISTS vehicle_alert_rule (
  id VARCHAR(64) NOT NULL PRIMARY KEY,
  name VARCHAR(80) NOT NULL,
  description VARCHAR(500) NOT NULL DEFAULT '',
  severity ENUM('critical','major','minor') NOT NULL,
  value_type ENUM('numeric','boolean') NOT NULL,
  metric VARCHAR(64) NOT NULL,
  operator VARCHAR(8) NOT NULL,
  threshold_value DOUBLE NOT NULL DEFAULT 0,
  boolean_threshold TINYINT NULL,
  duration_sec INT NOT NULL DEFAULT 0,
  recovery_operator VARCHAR(8) NOT NULL DEFAULT '',
  recovery_threshold DOUBLE NOT NULL DEFAULT 0,
  repeat_interval_sec INT NOT NULL DEFAULT 0,
  scope_protocols_json TEXT NOT NULL,
  scope_vins_json LONGTEXT NOT NULL,
  notification_channels_json TEXT NOT NULL,
  enabled TINYINT(1) NOT NULL DEFAULT 1,
  version INT NOT NULL DEFAULT 1,
  created_by VARCHAR(128) NOT NULL,
  updated_by VARCHAR(128) NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  KEY idx_alert_rule_enabled (enabled, severity),
  KEY idx_alert_rule_metric (metric)
);

CREATE TABLE IF NOT EXISTS vehicle_alert_rule_audit (
  id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  rule_id VARCHAR(64) NOT NULL,
  rule_version INT NOT NULL,
  actor VARCHAR(128) NOT NULL,
  action VARCHAR(32) NOT NULL,
  snapshot_json LONGTEXT NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  KEY idx_alert_rule_audit_rule (rule_id, rule_version),
  KEY idx_alert_rule_audit_created (created_at)
);

CREATE TABLE IF NOT EXISTS vehicle_alert_candidate (
  rule_id VARCHAR(64) NOT NULL,
  vin VARCHAR(64) NOT NULL,
  protocol VARCHAR(32) NOT NULL,
  first_matched_at DATETIME(3) NOT NULL,
  last_matched_at DATETIME(3) NOT NULL,
  latest_value DOUBLE NOT NULL,
  source_event_id VARCHAR(128) NOT NULL DEFAULT '',
  PRIMARY KEY (rule_id, vin, protocol),
  KEY idx_alert_candidate_duration (first_matched_at, last_matched_at)
);

CREATE TABLE IF NOT EXISTS vehicle_alert_event (
  id VARCHAR(64) NOT NULL PRIMARY KEY,
  fingerprint VARCHAR(255) NOT NULL,
  rule_id VARCHAR(64) NOT NULL,
  rule_name VARCHAR(80) NOT NULL,
  rule_version INT NOT NULL,
  severity ENUM('critical','major','minor') NOT NULL,
  status ENUM('unprocessed','processing','recovered','closed','ignored') NOT NULL,
  vin VARCHAR(64) NOT NULL,
  plate VARCHAR(64) NOT NULL DEFAULT '',
  protocol VARCHAR(32) NOT NULL DEFAULT '',
  metric VARCHAR(64) NOT NULL,
  operator VARCHAR(8) NOT NULL,
  trigger_value DOUBLE NOT NULL,
  threshold_value DOUBLE NOT NULL,
  unit VARCHAR(24) NOT NULL DEFAULT '',
  duration_sec INT NOT NULL DEFAULT 0,
  location_text VARCHAR(255) NOT NULL DEFAULT '',
  longitude DOUBLE NULL,
  latitude DOUBLE NULL,
  source_event_id VARCHAR(128) NOT NULL DEFAULT '',
  event_at DATETIME(3) NULL,
  received_at DATETIME(3) NULL,
  triggered_at DATETIME(3) NOT NULL,
  recovered_at DATETIME(3) NULL,
  handler VARCHAR(128) NOT NULL DEFAULT '',
  version INT NOT NULL DEFAULT 1,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  KEY idx_alert_event_list (triggered_at, id),
  KEY idx_alert_event_status (status, severity, triggered_at),
  KEY idx_alert_event_vehicle (vin, triggered_at),
  KEY idx_alert_event_rule (rule_id, triggered_at),
  KEY idx_alert_event_fingerprint (fingerprint, status)
);

CREATE TABLE IF NOT EXISTS vehicle_alert_event_action (
  id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  event_id VARCHAR(64) NOT NULL,
  action VARCHAR(32) NOT NULL,
  from_status VARCHAR(32) NOT NULL DEFAULT '',
  to_status VARCHAR(32) NOT NULL,
  actor VARCHAR(128) NOT NULL,
  note VARCHAR(200) NOT NULL DEFAULT '',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  KEY idx_alert_action_event (event_id, created_at),
  KEY idx_alert_action_actor (actor, created_at)
);

CREATE TABLE IF NOT EXISTS vehicle_alert_notification (
  id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  event_id VARCHAR(64) NOT NULL,
  title VARCHAR(120) NOT NULL,
  content VARCHAR(500) NOT NULL,
  severity ENUM('critical','major','minor') NOT NULL,
  channel ENUM('in_app','sms','email','wecom') NOT NULL DEFAULT 'in_app',
  delivery_status ENUM('created','reserved','sent','failed') NOT NULL DEFAULT 'created',
  is_read TINYINT(1) NOT NULL DEFAULT 0,
  read_by VARCHAR(128) NOT NULL DEFAULT '',
  read_at DATETIME(3) NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  KEY idx_alert_notification_unread (channel, is_read, created_at),
  KEY idx_alert_notification_event (event_id)
);