vector-im-hydrogen-web/src/matrix/storage/idb/create.js

import Storage from "./storage.js";
import { openDatabase } from "./utils.js";

export default async function createIdbStorage(databaseName) {
	const db = await openDatabase(databaseName, createStores, 1);
	return new Storage(db);
}

function createStores(db) {
	db.createObjectStore("session", {keyPath: "key"});
	// any way to make keys unique here? (just use put?)
	db.createObjectStore("roomSummary", {keyPath: "roomId"});

    db.createObjectStore("timelineFragments", {keyPath: ["roomId", "id"]});
	// needs roomId separate because it might hold a gap and no event
	const timelineEvents = db.createObjectStore("timelineEvents", {keyPath: ["event.room_id", "fragmentId", "sortKey"]});
	timelineEvents.createIndex("byEventId", [
		"event.room_id",
		"event.event_id"
	], {unique: true});

	db.createObjectStore("roomState", {keyPath: [
		"roomId",
		"event.type",
		"event.state_key"
	]});
	
	// const roomMembers = db.createObjectStore("roomMembers", {keyPath: [
	// 	"event.room_id",
	// 	"event.content.membership",
	// 	"event.state_key"
	// ]});
	// roomMembers.createIndex("byName", ["room_id", "content.name"]);
}