42 lines
2.1 KiB
TypeScript
42 lines
2.1 KiB
TypeScript
/**
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* Indexes for the queries that ran as full scans.
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*
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* - feeds page by created_at (newest first), a user's dumps and upvotes by
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* (user_id, created_at) — these replace the bare user_id indexes;
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* - dump and playlist pages are looked up by slug;
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* - the child side of every ON DELETE CASCADE / SET NULL foreign key, which
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* SQLite otherwise scans on each parent delete (a comment's replies, a user's
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* comments, follows, chat messages, invites, reset tokens), and the
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* followers of a user or playlist, read on every new dump;
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* - @mentions resolve usernames case-insensitively, by lower(username).
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*
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* Idempotent: also runs against fresh databases created from schema.sql, where
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* these indexes already exist.
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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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/** Applies this migration to `db`. */
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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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