HSQLDB 2.7.3: original LocalDateTime nanos          = 123456789
HSQLDB 2.7.3: plain column (precision default) nanos = 123456000 (value=2026-01-01T12:00:00.123456)
HSQLDB 2.7.3: @Column(precision=9) column nanos      = 123456000 (value=2026-01-01T12:00:00.123456)
HSQLDB 2.7.3: original Instant nanos                 = 123456789
HSQLDB 2.7.3: plain Instant column nanos             = 123456000 (value=2027-01-15T08:00:00.123456Z)
