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e23f39175d
lookup_community_by_host runs on every relay handshake (WS/bridge/media/git/nip05). The query used `WHERE host = $1`, but the only host index is `idx_communities_host ON communities (lower(host))` — so Postgres seq-scanned communities on every connection: ~5.4ms scanning all rows at 100k tenants. Match the indexed expression with `WHERE lower(host) = lower($1)` so the lookup uses idx_communities_host (~0.037ms index scan at 100k rows). Adds an ignored Postgres regression test asserting case-insensitive host lookup resolves against the lower(host) index. Found by Max while load-testing #1321 at 100k communities. Co-authored-by: Max <d8473ee32b973aa31a21a65adddcc4b69cc2a8a4dee8121ecd51926e0cddbc02@sprout-oss.stage.blox.sqprod.co> Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: Tyler Longwell <tlongwell@block.xyz>