CREATE TABLE IF NOT EXISTS t_tts_task (
    id VARCHAR(64) PRIMARY KEY COMMENT 'Primary key',
    user_id VARCHAR(64) NOT NULL COMMENT 'Owner user id',
    source_type VARCHAR(50) NOT NULL COMMENT 'Source type, for example epic_script',
    source_id VARCHAR(64) NOT NULL COMMENT 'Source content id',
    text_hash VARCHAR(128) NOT NULL COMMENT 'Hash of cleaned text and voice',
    text_length INT NOT NULL COMMENT 'Cleaned text length',
    voice VARCHAR(64) NOT NULL DEFAULT 'default_zh_female' COMMENT 'Voice id',
    status VARCHAR(20) NOT NULL DEFAULT 'pending' COMMENT 'pending, processing, success, failed',
    audio_url VARCHAR(500) NULL COMMENT 'Public audio URL',
    audio_path VARCHAR(500) NULL COMMENT 'Server audio path',
    duration_ms BIGINT NULL COMMENT 'Audio duration',
    error_message VARCHAR(1000) NULL COMMENT 'Failure message',
    request_count INT NOT NULL DEFAULT 1 COMMENT 'Cache hit request count',
    create_by VARCHAR(64) NULL COMMENT 'Creator',
    create_time DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT 'Create time',
    update_by VARCHAR(64) NULL COMMENT 'Updater',
    update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'Update time',
    is_deleted TINYINT DEFAULT 0 COMMENT 'Logic delete flag',
    remarks VARCHAR(500) NULL COMMENT 'Remarks'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='Text-to-speech task table';

CREATE INDEX idx_tts_task_user_source ON t_tts_task (user_id, source_type, source_id);
CREATE INDEX idx_tts_task_text_hash ON t_tts_task (text_hash);
CREATE INDEX idx_tts_task_status ON t_tts_task (status);
CREATE INDEX idx_tts_task_create_time ON t_tts_task (create_time);