39 lines
2.0 KiB
TypeScript
39 lines
2.0 KiB
TypeScript
/**
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* Adds indexes for the queries that scanned a whole table. The feeds page
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* dumps by `created_at`, and a user's dumps and upvotes by `(user_id,
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* created_at)`, which replace the indexes on `user_id` alone. Dumps and
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* playlists are looked up by slug. Each foreign key with ON DELETE gets an
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* index on its child column, which SQLite otherwise scans on every delete of
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* a parent row, and the followers of a user or playlist are read on every new
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* dump. Mentions look usernames up by `lower(username)`.
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*
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* @module
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*/
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import type { DatabaseSync } from "node:sqlite";
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/**
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* Run once by `runMigrations`. A database made from schema.sql already has
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* these indexes.
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*/
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export function up(db: DatabaseSync): void {
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db.exec(`
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DROP INDEX IF EXISTS idx_dumps_user;
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DROP INDEX IF EXISTS idx_votes_user;
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CREATE INDEX IF NOT EXISTS idx_dumps_created ON dumps(created_at);
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CREATE INDEX IF NOT EXISTS idx_dumps_user_created ON dumps(user_id, created_at);
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CREATE INDEX IF NOT EXISTS idx_dumps_slug ON dumps(slug);
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CREATE INDEX IF NOT EXISTS idx_votes_user_created ON votes(user_id, created_at);
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CREATE INDEX IF NOT EXISTS idx_playlists_slug ON playlists(slug);
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CREATE INDEX IF NOT EXISTS idx_comments_parent ON comments(parent_id);
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CREATE INDEX IF NOT EXISTS idx_comments_user ON comments(user_id);
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CREATE INDEX IF NOT EXISTS idx_follows_followed_user ON follows(followed_user_id);
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CREATE INDEX IF NOT EXISTS idx_follows_followed_playlist ON follows(followed_playlist_id);
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CREATE INDEX IF NOT EXISTS idx_chat_messages_user ON chat_messages(user_id);
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CREATE INDEX IF NOT EXISTS idx_invites_inviter ON invites(inviter_id);
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CREATE INDEX IF NOT EXISTS idx_users_invited_by ON users(invited_by);
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CREATE INDEX IF NOT EXISTS idx_password_reset_tokens_user ON password_reset_tokens(user_id);
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CREATE INDEX IF NOT EXISTS idx_users_username_lower ON users(lower(username));
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`);
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}
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