-- Add search_text column for full-text search on audit log events.
-- Populated at write time with searchable content extracted from the change event
-- (user name, entity FQN, entity type, service name, field change names and values).
-- This avoids scanning the event_json LONGTEXT column at query time.
ALTER TABLE audit_log_event ADD COLUMN search_text TEXT DEFAULT NULL;

-- MySQL built-in FULLTEXT index on InnoDB — no extensions required.
-- Supports MATCH() AGAINST() queries in NATURAL LANGUAGE mode.
CREATE FULLTEXT INDEX idx_audit_log_search_text ON audit_log_event (search_text);