Ok, that tells us exactly what we needed to know, and Peter was right,
those quotes are in the actual data, and shouldn't be.
Try this query please:
UPDATE foo SET dttm = date(trim(dttm,'''')); -- That's 4 single quotes
in a row, which is a single quote, escaped with another single quote,
inside two single quotes.
Followed by your original:
SELECT dttm, max(i) AS max_i FROM foo GROUP BY dttm ORDER BY dttm;
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