The page halves compare the cursor's timestamp with the window's in Python;
a null or naive one raised there, past the route's 400. decode_cursor now
refuses a null non-nullable key and a naive timestamp.
A broad word matched most of the library and ts_rank read every match:
"a" took 4.4 s a page on prod. The window's start is read once (0.1 s) and
rides the cursor, so a video ingested mid-scroll cannot repeat a row; the
page is read as its two halves, each on an index (80 ms + 5 ms).
peter