read_importable_agent_session_rows()'s `limit` is a bound on LOGICAL
conversations (the slice runs after lineage projection), but the bounded
candidate CTE spends its raw window on compression segments and rows the
post-projection visibility filters drop. A lineage-heavy profile therefore got
back far fewer conversations than it asked for, and silently: with twelve
ten-segment chains, limit=20 returned 8.
Retry once with a wider window when the first one was fully consumed AND still
under-delivered. The common case is unchanged - the first window is still 8x the
requested limit and the retry never runs when the db simply has nothing more to
give - so the #2628 capped-scan guarantee holds.
Rodrigo Gomes da Silva
ff274fc406