- ensure_group_indexes() runs the ALTER only under WP-CLI or WP-Cron (filter
tmdo_schema_ddl_allowed); web requests, including /wp-admin/ before
auth_redirect() and admin-post.php, schedule tmdo_ensure_group_indexes instead
- MySQL GET_LOCK keeps it to one process (add_option() is INSERT ... ON
DUPLICATE KEY UPDATE and cannot serve as a lock); released by MySQL if the
process dies
- the applied signature is recorded only when every ALTER succeeds; failures
log schema.index_failed and stay in pending_indexes(), which doctor reports
- new tables get their declared cidx_ indexes in CREATE TABLE
- test stub wpdb::query()/insert() return false on SQL errors like wpdb
- Verify: GroupCompositeIndexTest 7/7, unit 698, integration 576, phpcs, stan
- PR: PR-090a
wpdev
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