Discord js blacklist - node.js

Question

Hello I just started in computer science and I would like to make a system of blacklist that when a person is blacklisted the person is banned from all servers and present the bot then delete the messages of the blacklisted user and moreover who can send a message that the person is blacklisted and by whom especially
'use strict'
const Command = require('../../structure/Command.js')
class Staff extends Command {
constructor() {
super({
name: 'blacklist',
category: 'anti-raid',
description: 'Allows people who are staff to blacklist one person.',
usage: 'blacklist',
example: ['blacklist <add/remove> <#user/id> <reason>'],
aliases: []
})
}
async run(client, message, args) {
let staff = client.bdd.query('SELECT * FROM user_staff WHERE user_id = ?', [message.author.id])
if (staff) {
if (args[1] === 'add') {
let member = message.mentions.members.first() || client.users.cache.get(args[2])
if (!member) {
let memberId = args[2]
let foundMemberId = false
if (memberId.length === 18) {
foundMemberId = true
} else if (memberId.length > 18) {
memberId = memberId.substring(3)
memberId = memberId.slice(0, -1)
if (memberId.length === 18) {
foundMemberId = true
}
}
if (foundMemberId === true) {
member = {
id: memberId
}
}
if (foundMemberId === false) {
return message.channel.send('Please specify a correct ID or mention correctly.')
}
}
let reason = args[3].slice(' ')
if(!reason) return message.channel.send('Please specify a reason for this blacklist.')
try {
client.bdd.query('SELECT * FROM user_blacklist WHERE user_id = ?', [member.id], function (err, result) {
if (err) throw err
if (result.length === 0) {
const user = message.member.user.tag
const userId = message.member.user.id
const guild = message.guild.name
const guildId = message.guild.id
client.bdd.query('INSERT INTO user_blacklist SET ?', {user_id: member.id, reason: reason, banned_by: user, banning_guild: guild, banning_guild_id: guildId, banned_by_id: userId })
message.channel.send(`The user with the identification number **${member.id}** is now blacklisted for the following reason: **${reason}** !`)
} else {
message.channel.send(`The user with the identification number **${member.id}** is already blacklisted for the following reason: **${result.reason}** !`)
}
})
} catch (err) {
console.log(err)
}
} else if (args[1] === 'remove') {
let member = message.mentions.members.first() || client.users.cache.get(args[2])
if (!member) {
let memberId = args[2]
let foundMemberId = false
if (memberId.length === 18) {
foundMemberId = true
} else if (memberId.length > 18) {
memberId = memberId.substring(3)
memberId = memberId.slice(0, -1)
if (memberId.length === 18) {
foundMemberId = true
}
}
if (foundMemberId === true) {
member = {
id: memberId
}
}
if (foundMemberId === false) {
return message.channel.send('Please specify a correct ID or mention correctly.')
}
}
try {
client.bdd.query('SELECT * FROM user_blacklist WHERE user_id = ?', [member.id], function (err, result) {
if (err) throw err
if (result.length !== 0) {
client.bdd.query('DELETE FROM user_blacklist WHERE user_id = ?', [member.id])
message.channel.send(`The user with the identification number **${member.id}** was successfully removed from the blacklist..`)
} else {
message.channel.send(`The user with the identification number **${member.id}** is not blacklisted.`)
}
})
} catch (err) {
console.log(err)
}
}
} else {
await message.channel.send('You\'re not part of the staff.')
}
}
}
module.exports = new Staff