-- IMAP-Postfach für das Ticketsystem: eingehende Mails werden abgerufen, bekannten Tickets/Kunden
-- zugeordnet oder als neues Ticket angelegt; unbekannte Absender landen zur manuellen Zuordnung
-- im Posteingang (siehe inbox_messages).
CREATE TABLE imap_settings (
  id TINYINT PRIMARY KEY DEFAULT 1,
  host VARCHAR(253) NULL,
  port SMALLINT UNSIGNED NOT NULL DEFAULT 993,
  secure_mode ENUM('tls','starttls') NOT NULL DEFAULT 'tls',
  username VARCHAR(200) NULL,
  secrets_enc TEXT NULL,
  folder VARCHAR(200) NOT NULL DEFAULT 'INBOX',
  enabled TINYINT(1) NOT NULL DEFAULT 0,
  last_uid BIGINT UNSIGNED NULL,
  last_checked_at DATETIME(3) NULL,
  last_error VARCHAR(500) NULL,
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  updated_by CHAR(36) NULL REFERENCES users(id),
  CONSTRAINT chk_imap_singleton CHECK (id = 1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
INSERT INTO imap_settings (id) VALUES (1);

CREATE TABLE inbox_messages (
  id CHAR(36) PRIMARY KEY,
  uid BIGINT UNSIGNED NOT NULL,
  message_id VARCHAR(998) NULL,
  from_email VARCHAR(254) NOT NULL,
  from_name VARCHAR(200) NULL,
  subject VARCHAR(500) NULL,
  body_text MEDIUMTEXT NULL,
  received_at DATETIME(3) NOT NULL,
  status ENUM('matched','created','unmatched','ignored') NOT NULL DEFAULT 'unmatched',
  ticket_id CHAR(36) NULL REFERENCES tickets(id),
  matched_user_id CHAR(36) NULL REFERENCES users(id),
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  UNIQUE KEY uk_inbox_uid (uid),
  KEY idx_inbox_status (status)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;