[LucaCappelletti94]

PostgreSQL prints interval '-1 day 2 hours' as -1 days +02:00:00. Under the default IntervalStyle it marks a positive count or clock with + when the count printed just before it was negative. pg2sqlite joined the counts with a plain space and stored -1 days 02:00:00, so the same mixed-sign interval written as a literal and synced from the server became two different strings in the replica, and an equality filter or DISTINCT saw two values.

to_postgres_text now follows AddPostgresIntPart in PostgreSQL's datetime.c, where the sign of each non-zero count decides the + of the next count only, so -1 year 1 day 2 hours prints -1 years +1 day 02:00:00. The new test pins literals checked against PostgreSQL 18. Reading the stored text back already accepted the +.

CI needs connetto-rs/sql-traits#172 first, because sqlparser main currently breaks sql-traits main.

[codecov]

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