JDBC Timestamp binding shifted timestamps by the JVM local timezone
offset on both insert and query, producing asymmetric UTC offsets that
broke time-range filtering and cursor pagination. Switching inserts
(indexBatch, insertBufferedBatch) and all WHERE predicates to ISO-8601
strings via parseDateTime64BestEffort, and reading timestamps back as
epoch-millis via toUnixTimestamp64Milli, pins everything to UTC and
fixes the time-range filter test plus cursor pagination.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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