Gabriel Kaszewski 79f1e63bb8 perf(feed): replace correlated subqueries with LEFT JOIN aggregations ...

Feed queries ran 5 correlated subqueries per row (3 COUNT + 2 EXISTS
for engagement counts and viewer context). Replaced with LEFT JOIN
aggregations computed once per query. Adds migration 016 with indexes
on likes(thought_id), boosts(thought_id), thoughts(in_reply_to_id),
and compound viewer-context indexes — expected to drop ~3s queries to
<100ms on typical page sizes.

Also removes WebFinger from the footer (requires query params, zero
standalone value as a link).

2026-05-29 04:35:32 +02:00

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