-- Migration: optimize meeting loading performance
-- Created at: 2026-04-03

BEGIN;

SET @sql := IF(
  EXISTS (
    SELECT 1
    FROM information_schema.statistics
    WHERE table_schema = DATABASE()
      AND table_name = 'audio_files'
      AND index_name = 'idx_audio_files_meeting_id'
  ),
  'SELECT 1',
  'ALTER TABLE `audio_files` ADD KEY `idx_audio_files_meeting_id` (`meeting_id`)'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql := IF(
  EXISTS (
    SELECT 1
    FROM information_schema.statistics
    WHERE table_schema = DATABASE()
      AND table_name = 'transcript_segments'
      AND index_name = 'idx_transcript_segments_meeting_time'
  ),
  'SELECT 1',
  'ALTER TABLE `transcript_segments` ADD KEY `idx_transcript_segments_meeting_time` (`meeting_id`, `start_time_ms`)'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql := IF(
  EXISTS (
    SELECT 1
    FROM information_schema.statistics
    WHERE table_schema = DATABASE()
      AND table_name = 'transcript_tasks'
      AND index_name = 'idx_transcript_tasks_meeting_created'
  ),
  'SELECT 1',
  'ALTER TABLE `transcript_tasks` ADD KEY `idx_transcript_tasks_meeting_created` (`meeting_id`, `created_at`)'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql := IF(
  EXISTS (
    SELECT 1
    FROM information_schema.statistics
    WHERE table_schema = DATABASE()
      AND table_name = 'llm_tasks'
      AND index_name = 'idx_llm_tasks_meeting_created'
  ),
  'SELECT 1',
  'ALTER TABLE `llm_tasks` ADD KEY `idx_llm_tasks_meeting_created` (`meeting_id`, `created_at`)'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql := IF(
  EXISTS (
    SELECT 1
    FROM information_schema.statistics
    WHERE table_schema = DATABASE()
      AND table_name = 'meetings'
      AND index_name = 'idx_meetings_user_time_created'
  ),
  'SELECT 1',
  'ALTER TABLE `meetings` ADD KEY `idx_meetings_user_time_created` (`user_id`, `meeting_time`, `created_at`)'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

COMMIT;