DROP INDEX IF EXISTS idx_memory_extraction_due;
ALTER TABLE memory_subjects DROP COLUMN extract_attempt_id;
ALTER TABLE memory_subjects DROP COLUMN extract_lease_until;
ALTER TABLE memory_subjects DROP COLUMN extract_started_at;
ALTER TABLE memory_subjects DROP COLUMN extract_next_at;
ALTER TABLE memory_subjects DROP COLUMN extract_failures;
ALTER TABLE memory_subjects DROP COLUMN extract_chat_model_id;
ALTER TABLE memory_subjects DROP COLUMN extract_language;
ALTER TABLE memory_subjects DROP COLUMN session_cursors;