Make migration scripts

and use createdAt instead of _id

tools/migration/nighthike/10.js

@@ -0,0 +1,3 @@
+db.following.remove({
+	deletedAt: { $exists: true }
+});

tools/migration/nighthike/9.js

@@ -0,0 +1,79 @@
+// for Node.js interpret
+
+const { default: Following } = require('../../../built/models/following');
+const { default: FollowingLog } = require('../../../built/models/following-log');
+const { default: FollowedLog } = require('../../../built/models/followed-log');
+const { default: zip } = require('@prezzemolo/zip')
+const html = require('../../../built/text/html').default;
+const parse = require('../../../built/text/parse').default;
+
+const migrate = async (following) => {
+	const followingCount = await Following.count({
+		followerId: following.followerId,
+		_id: { $lt: following._id },
+		$or: [
+			{ deletedAt: { $exists: false } },
+			{ deletedAt: { $gt: following.createdAt } }
+		]
+	});
+	await FollowingLog.insert({
+		createdAt: following.createdAt,
+		userId: following.followerId,
+		count: followingCount + 1
+	});
+
+	const followersCount = await Following.count({
+		followeeId: following.followeeId,
+		_id: { $lt: following._id },
+		$or: [
+			{ deletedAt: { $exists: false } },
+			{ deletedAt: { $gt: following.createdAt } }
+		]
+	});
+	await FollowedLog.insert({
+		createdAt: following.createdAt,
+		userId: following.followeeId,
+		count: followersCount + 1
+	});
+
+	if (following.deletedAt) {
+		await FollowingLog.insert({
+			createdAt: following.deletedAt,
+			userId: following.followerId,
+			count: followingCount - 1
+		});
+
+		await FollowedLog.insert({
+			createdAt: following.deletedAt,
+			userId: following.followeeId,
+			count: followersCount - 1
+		});
+	}
+
+	return true;
+}
+
+async function main() {
+	const count = await Following.count({});
+
+	const dop = Number.parseInt(process.argv[2]) || 5
+	const idop = ((count - (count % dop)) / dop) + 1
+
+	return zip(
+		1,
+		async (time) => {
+			console.log(`${time} / ${idop}`)
+			const doc = await Following.find({}, {
+				limit: dop, skip: time * dop, sort: { _id: 1 }
+			})
+			return Promise.all(doc.map(migrate))
+		},
+		idop
+	).then(a => {
+		const rv = []
+		a.forEach(e => rv.push(...e))
+		return rv
+	})
+}
+
+main().then(console.dir).catch(console.error)