tomhughes left a comment (openstreetmap/openstreetmap-website#5667)
I think this will do the job, obviously with batches of note IDs in the CTE
expression:
```sql
WITH first_comment AS(
SELECT DISTINCT ON (note_id) *
FROM note_comments
WHERE note_id BETWEEN 1000 AND 2000
ORDER BY note_id, id
)
UPDATE notes
SET description = first_comment.body,
user_id = first_comment.author_id,
user_ip = first_comment.author_ip
FROM first_comment
WHERE first_comment.note_id = notes.id
AND first_comment.event = 'opened';
```
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