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db: drop idx_thread_metadata_root, a prefix of idx_thread_metadata_window

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With both indexes the planner can read a thread's latest reply through the
narrower one and sort every reply. On a 20k-reply thread that cost 28ms of
the sidebar; through the window index it is one probe (0.76ms).

Signed-off-by: hMB2 <0400eb0da32afbbf16cdd1dee6ffd243587e8f3d6a2823fe7dfa95d16b002b7d@buzz.block.builderlab.xyz>
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hMB2
2026-10-07 01:55:34 -07:00
parent fc21e64de1
commit 3cb22ecd3b
2 changed files with 5 additions and 1 deletions
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schema/schema.sql
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@@ -576,7 +576,6 @@ CREATE TABLE thread_metadata (
);
CREATE INDEX idx_thread_metadata_parent ON thread_metadata (community_id, parent_event_id);
CREATE INDEX idx_thread_metadata_root ON thread_metadata (community_id, root_event_id);
CREATE INDEX idx_thread_metadata_window
ON thread_metadata (community_id, root_event_id, event_created_at DESC, event_id ASC);
CREATE INDEX idx_thread_metadata_channel_depth