diff --git a/bot/db/db.d.ts b/bot/db/db.d.ts
index 386c079..0be043a 100644
--- a/bot/db/db.d.ts
+++ b/bot/db/db.d.ts
@@ -7,10 +7,4 @@ export interface GuildType {
     recommend: boolean;
   };
 }
-export type GuildRow = Omit<GuildType, "options"> & { options: string };
-
-// export interface UserType {
-//   guild_id: string;
-//   id: string;
-//   name: string;
-// }
\ No newline at end of file
+export type GuildRow = Omit<GuildType, "options"> & { options: string };
\ No newline at end of file
diff --git a/bot/package.json b/bot/package.json
index 7bce364..39df2b1 100644
--- a/bot/package.json
+++ b/bot/package.json
@@ -20,7 +20,6 @@
     "typescript": "^6.0.2"
   },
   "dependencies": {
-    "axios": "^1.14.0",
     "better-sqlite3": "^12.8.0",
     "colors": "^1.4.0",
     "discord.js": "^14.25.1",
diff --git a/bot/src/classes/BotClient.ts b/bot/src/classes/BotClient.ts
index 6fedfdf..0575888 100644
--- a/bot/src/classes/BotClient.ts
+++ b/bot/src/classes/BotClient.ts
@@ -1,5 +1,6 @@
 import { Client, ClientEvents, ColorResolvable, EmbedBuilder, EmbedField, GatewayIntentBits, Message } from "discord.js";
 import { Config } from "../utils/Config";
+import { Logger } from "../utils/Logger";
 
 export class BotClient extends Client {
   public prefix = Config.prefix;
@@ -69,8 +70,10 @@ export class BotClient extends Client {
     setTimeout(async () => {
       try {
         const msg = await message.fetch(true).catch(() => undefined);
-        if (msg?.deletable) msg.delete().catch(() => {});
-      } catch {};
+        if (msg?.deletable) msg.delete().catch((err) => {
+          Logger.warn(`[BotClient] 메세지 삭제 실패: ${String(err)}`);
+        });
+      } catch {}
     }, Math.max(100, time * (customTime ? 1 : 6000)));
   }
 }
\ No newline at end of file
diff --git a/bot/src/classes/GuildPlayer.ts b/bot/src/classes/GuildPlayer.ts
index 1bd7067..9948ec5 100644
--- a/bot/src/classes/GuildPlayer.ts
+++ b/bot/src/classes/GuildPlayer.ts
@@ -5,7 +5,7 @@ import { timeFormat } from "../utils/music/Utils";
 import { default_content, default_embed, default_image, getButtons } from "../utils/music/Config";
 import { GuildType } from "../../db/db";
 import { DB } from "../utils/Database";
-import { shuffle } from "../utils/Shuffle";
+import { shuffle } from "../utils/shuffle";
 import { checkTextChannelAndMsg } from "../utils/music/Channel";
 import { Logger } from "../utils/Logger";
 
@@ -22,6 +22,7 @@ export class GuildPlayer {
   public queue: QueueTrack[] = [];
   private errorTimer: NodeJS.Timeout | undefined;
   private endTimer: NodeJS.Timeout | undefined;
+  private closedTimer: NodeJS.Timeout | undefined;
 
   constructor(
     public guild: Guild,
@@ -32,45 +33,51 @@ export class GuildPlayer {
   ) {
     this.player.setGlobalVolume(50);
     this.player.on("start", (_data: TrackStartEvent) => {
+      // endTimer가 남아있으면 제거 (새 곡 재생 시작)
+      if (this.endTimer !== undefined) {
+        clearTimeout(this.endTimer);
+        this.endTimer = undefined;
+      }
       Redis?.publishState("player_update", {
         guildId: this.guild.id,
       });
     });
     this.player.on("end", async (data: TrackEndEvent) => {
-      if (this.isDead) return;
-      if (data.reason === "replaced") return;
-      // 방금 끝난 곡을 대기열에서 지우면서 lastPlayedTrack에 저장
-      this.lastPlayedTrack = this.queue.shift();
-      if (this.queue.length > 0) {
-        await this.playNext();
-      } else if (this.isRecommend && this.canRecommend) {
-        await this.autoPlay();
-      } else {
-        this.end();
+      try {
+        if (this.isDead) return;
+        if (data.reason === "replaced") return;
+        // 방금 끝난 곡을 대기열에서 지우면서 lastPlayedTrack에 저장
+        this.lastPlayedTrack = this.queue.shift();
+        if (this.queue.length > 0) {
+          await this.playNext();
+        } else if (this.isRecommend && this.canRecommend) {
+          await this.autoPlay();
+        } else {
+          this.end();
+        }
+      } catch (err) {
+        Logger.error(`[GuildPlayer] end 이벤트 ��리 중 에러: ${String(err)}`);
       }
     });
     this.player.on("closed", () => {
       if (this.isDead) return;
       Logger.info(`[GuildPlayer] 음성 연결이 끊어졌습니다. 재접속을 대기합니다...`);
-      setTimeout(() => {
+      // 이전 closed 타이머가 있으면 제거
+      if (this.closedTimer !== undefined) {
+        clearTimeout(this.closedTimer);
+      }
+      this.closedTimer = setTimeout(() => {
+        this.closedTimer = undefined;
         if (this.isDead) return;
         // 5초가 지났는데도 연결이 복구되지 않았을 때만 방을 나갑니다.
-        
+
         // 디스코드 방에 내 봇(me)이 없으면 봇을 삭제(delete)한다!
         if (!this.guild.members.me?.voice?.channelId) {
           Logger.warn(`[GuildPlayer] 음성채널에 봇이 없습니다. player를 초기화합니다.`);
           return this.delete();
         }
 
-        /**
-         * declare enum State {
-         *   CONNECTING = 0,
-         *   CONNECTED = 1,
-         *   DISCONNECTING = 2,
-         *   DISCONNECTED = 3
-         * }
-         */
-        // (1 = CONNECTED, Shoukaku 버전에 따라 연결 상태 체크가 다를 수 있으니 안전하게 확인)
+        // (1 = CONNECTED, Shoukaku 버전에 따라 연결 상태 체크가 다를 수 있으�� 안전하게 확인)
         if (this.player && this.player.node.state !== 1) {
           Logger.warn(`[GuildPlayer] 연결 복구 실패. 봇을 퇴장시킵니다.`);
           return this.delete();
@@ -79,12 +86,20 @@ export class GuildPlayer {
     });
 
     this.player.on("exception", async (data) => {
-      Logger.error(`[Lavalink] 재생 중 에러 발생: ${data.exception?.message}`);
-      await this.errMsg("유튜브 차단 또는 재생 오류로 인해 이 곡을 건너뜁니다.");
+      try {
+        Logger.error(`[Lavalink] 재생 중 에러 발생: ${data.exception?.message}`);
+        await this.errMsg("유튜브 차단 또는 재생 오류로 인해 이 곡을 건너뜁니다.");
+      } catch (err) {
+        Logger.error(`[GuildPlayer] exception 이벤트 처리 중 에러: ${String(err)}`);
+      }
     });
     this.player.on("stuck", async (data) => {
-      Logger.error(`[Lavalink] 곡 로딩 멈춤(Stuck) 발생: ${data.thresholdMs}ms 초과`);
-      await this.errMsg("음원 로딩이 멈췄습니다. 다음 곡으로 넘어갑니다.");
+      try {
+        Logger.error(`[Lavalink] 곡 로딩 멈춤(Stuck) 발생: ${data.thresholdMs}ms 초과`);
+        await this.errMsg("음원 로딩이 멈췄습니다. 다음 곡으로 넘어갑니다.");
+      } catch (err) {
+        Logger.error(`[GuildPlayer] stuck 이벤트 처리 중 에러: ${String(err)}`);
+      }
     });
   }
 
@@ -214,16 +229,31 @@ export class GuildPlayer {
       this.end();
       return;
     }
-    if (tracks[0].info.identifier === trackId) tracks = tracks.slice(1);
+    if (tracks.length > 0 && tracks[0].info.identifier === trackId) tracks = tracks.slice(1);
+    if (tracks.length === 0) {
+      this.end();
+      return;
+    }
     this.addTracks(tracks, "자동재생");
   }
 
-  public end() {
+  private clearAllTimers() {
     if (this.errorTimer !== undefined) {
       clearTimeout(this.errorTimer);
       this.errorTimer = undefined;
     }
-    if (this.endTimer !== undefined) clearTimeout(this.endTimer);
+    if (this.endTimer !== undefined) {
+      clearTimeout(this.endTimer);
+      this.endTimer = undefined;
+    }
+    if (this.closedTimer !== undefined) {
+      clearTimeout(this.closedTimer);
+      this.closedTimer = undefined;
+    }
+  }
+
+  public end() {
+    this.clearAllTimers();
     this.endTimer = setTimeout(() => {
       this.endTimer = undefined;
       this.delete(true);
@@ -238,7 +268,10 @@ export class GuildPlayer {
     if (this.isDead) return;
     if (!afterEnd) this.end();
     this.isDead = true;
-    this.player.destroy().catch(() => {});
+    this.clearAllTimers();
+    this.player.destroy().catch((err) => {
+      Logger.error(`[GuildPlayer] player.destroy 에러: ${String(err)}`);
+    });
     lavalinkManager.delPlayer(this.guild.id);
     lavalinkManager.shoukaku.leaveVoiceChannel(this.guild.id);
   }
diff --git a/bot/src/classes/Handler.ts b/bot/src/classes/Handler.ts
index d0d0451..54506ff 100644
--- a/bot/src/classes/Handler.ts
+++ b/bot/src/classes/Handler.ts
@@ -2,6 +2,7 @@ import { ChatInputCommandInteraction, Collection } from "discord.js";
 import { readdirSync } from "node:fs";
 import { Command } from "../types/Command";
 import { COMMAND_PATH, COMMANDS_PATH } from "../utils/Config";
+import { Logger } from "../utils/Logger";
 
 export class Handler {
   public commands: Collection<string, Command> = new Collection();
@@ -15,11 +16,16 @@ export class Handler {
     }
   }
 
-  public runCommand(interaction: ChatInputCommandInteraction) {
+  public async runCommand(interaction: ChatInputCommandInteraction) {
     const commandName = interaction.commandName;
     const command = this.commands.get(commandName);
 
     if (!command) return;
-    if (command.slashRun) command.slashRun(interaction);
+    try {
+      if (command.slashRun) await command.slashRun(interaction);
+    } catch (err) {
+      Logger.error(`[Handler] 명령어 '${commandName}' 실행 중 에러: ${String(err)}`);
+      await interaction.editReply({ content: "명령어 실행 중 오류가 발생했습니다." }).catch(() => {});
+    }
   }
 }
\ No newline at end of file
diff --git a/bot/src/classes/LavalinkManager.ts b/bot/src/classes/LavalinkManager.ts
index 7f51c73..fc6cbae 100644
--- a/bot/src/classes/LavalinkManager.ts
+++ b/bot/src/classes/LavalinkManager.ts
@@ -4,7 +4,7 @@ import { GuildPlayer } from "./GuildPlayer";
 import { Config } from "../utils/Config";
 import { Logger } from "../utils/Logger";
 import { parseLink } from "../utils/music/Url";
-import { shuffle } from "../utils/Shuffle";
+import { shuffle } from "../utils/shuffle";
 import { Spotify } from "../utils/api/Spotify";
 import { YoutubeMusic } from "../utils/api/YoutubeMusic";
 
diff --git a/bot/src/classes/RedisClient.ts b/bot/src/classes/RedisClient.ts
index b290a61..aeec4b9 100644
--- a/bot/src/classes/RedisClient.ts
+++ b/bot/src/classes/RedisClient.ts
@@ -148,8 +148,10 @@ class RedisClientClass {
           const numIndex = Number(data.index);
           if (isNaN(numIndex)) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "index 타입이 올바르지 않습니다." }));
           if (numIndex < 0) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "index는 0보다 크거나 같아야합니다." }));
-          if (numIndex >= context.player.queue.length-1) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "index가 queue.length보다 클수 없습니다." }));
-          const [removedTrack] = context.player.queue.splice(numIndex+1, 1);
+          // queue[0]은 현재 재생중인 곡이므로 실제 대기열은 queue[1]부터 시작
+          // numIndex는 대기열(queue[1]~) 기준이므로 실제 splice 위치�� numIndex+1
+          if (numIndex >= context.player.queue.length - 1) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "index가 대기열 범위를 초과합니다." }));
+          const [removedTrack] = context.player.queue.splice(numIndex + 1, 1);
           await this.pub.setex(resultKey, 60, JSON.stringify({ success: true, removedTrack }));
           context.player.setMsg();
         }
@@ -179,8 +181,8 @@ class RedisClientClass {
           if (!data.seek) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "seek를 찾을수 없습니다." }));
           const context = await this.getContext(data.serverId, resultKey, data.userId);
           if (!context.ok) return;
-          if (!context.player.isPlaying || !context.player.nowTrack) await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "재생중인 노래가 없습니다." }));
-          const duration = context.player.nowTrack?.info.length || 0;
+          if (!context.player.isPlaying || !context.player.nowTrack) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "재생중인 노래가 없습니다." }));
+          const duration = context.player.nowTrack.info.length || 0;
           const numSeek = Number(data.seek);
           if (isNaN(numSeek)) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "seek 타입이 올바르지 않습니다." }));
           if (numSeek < 0) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "seek는 0보다 크거나 같아야합니다." }));
@@ -195,7 +197,7 @@ class RedisClientClass {
           if (!data.volume) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "volume을 찾을수 없습니다." }));
           const context = await this.getContext(data.serverId, resultKey, data.userId);
           if (!context.ok) return;
-          if (!context.player.isPlaying || !context.player.nowTrack) await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "재생중인 노래가 없습니다." }));
+          if (!context.player.isPlaying || !context.player.nowTrack) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "재생중인 노래가 없습니다." }));
           const numVolume = Number(data.volume);
           if (isNaN(numVolume)) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "volume 타입이 올바르지 않습니다." }));
           if (numVolume < 0) return await this.pub.setex(resultKey, 60, JSON.stringify({ success: false, message: "volume은 0보다 크거나 같아야합니다." }));
diff --git a/bot/src/commands/channel.ts b/bot/src/commands/channel.ts
index d2951ca..eed961c 100644
--- a/bot/src/commands/channel.ts
+++ b/bot/src/commands/channel.ts
@@ -4,6 +4,7 @@ import { Command } from "../types/Command";
 import { clearAllMsg } from "../utils/music/Utils";
 import { default_content, default_embed, default_image, getButtons } from "../utils/music/Config";
 import { DB } from "../utils/Database";
+import { Logger } from "../utils/Logger";
 
 /** channel 명령어 */
 export default class implements Command {
@@ -100,7 +101,7 @@ export async function channelRegister(guild: Guild | null, channelId: string | n
     components: [ getButtons() ],
     files: [ default_image ],
   }).catch((err) => {
-    console.error(err);
+    Logger.error(`[Channel] 메세지 생성 실패: ${String(err)}`);
     return null;
   });
   if (!msg) return client.mkembed({
diff --git a/bot/src/commands/join.ts b/bot/src/commands/join.ts
index 8f1f722..5434e00 100644
--- a/bot/src/commands/join.ts
+++ b/bot/src/commands/join.ts
@@ -72,7 +72,7 @@ export async function channelJoin(guild: Guild | null, voiceChannelId: string |
   }) };
   
   let player = lavalinkManager.getPlayer(guild.id);
-  if (player) return { embed: client.mkembed({ title: `이미 <#${player.voiceChannelId} 참가중입니다.` }), player };
+  if (player) return { embed: client.mkembed({ title: `이미 <#${player.voiceChannelId}> 참가중입니다.` }), player };
   player = new GuildPlayer(
     guild,
     await lavalinkManager.shoukaku.joinVoiceChannel({
diff --git a/bot/src/events/interactionCreate.ts b/bot/src/events/interactionCreate.ts
index 23c6e17..714c137 100644
--- a/bot/src/events/interactionCreate.ts
+++ b/bot/src/events/interactionCreate.ts
@@ -1,36 +1,47 @@
 import { Interaction, MessageFlags } from "discord.js";
 import { handler } from "../index";
 import { buttonInteraction } from "../utils/music/Button";
+import { Logger } from "../utils/Logger";
 
 export const interactionCreate = async (interaction: Interaction) => {
-  if (interaction.isStringSelectMenu()) {
-    await interaction.deferReply({ flags: MessageFlags.Ephemeral }).catch(() => {});
-    const commandName = interaction.customId;
-    const args = interaction.values;
-    const command = handler.commands.get(commandName);
-    if (command?.menuRun) return await command.menuRun(interaction, args);
+  try {
+    if (interaction.isStringSelectMenu()) {
+      await interaction.deferReply({ flags: MessageFlags.Ephemeral }).catch((err) => {
+        Logger.warn(`[Interaction] SelectMenu deferReply 실패: ${String(err)}`);
+      });
+      const commandName = interaction.customId;
+      const args = interaction.values;
+      const command = handler.commands.get(commandName);
+      if (command?.menuRun) return await command.menuRun(interaction, args);
+    }
+
+    if (interaction.isButton()) {
+      const args = interaction.customId.split("-");
+      if (!args || args.length === 0) return;
+
+      if (args[0] === "music") return buttonInteraction(interaction, args.slice(1));
+
+      await interaction.deferReply({ flags: MessageFlags.Ephemeral }).catch((err) => {
+        Logger.warn(`[Interaction] Button deferReply 실패: ${String(err)}`);
+      });
+
+      const key = args.shift();
+      if (!key) return;
+      const command = handler.commands.get(key);
+      if (command?.buttonRun) return command.buttonRun(interaction, args);
+    }
+
+    if (!interaction.isChatInputCommand()) return;
+
+    /**
+     * 명령어 친사람만 보이게 설정
+     * flags: MessageFlags.Ephemeral
+     */
+    await interaction.deferReply({ flags: MessageFlags.Ephemeral }).catch((err) => {
+      Logger.warn(`[Interaction] Command deferReply 실패: ${String(err)}`);
+    });
+    await handler.runCommand(interaction);
+  } catch (err) {
+    Logger.error(`[Interaction] 처리 중 에러: ${String(err)}`);
   }
-  
-  if (interaction.isButton()) {
-    const args = interaction.customId.split("-");
-    if (!args || args.length === 0) return;
-
-    if (args[0] === "music") return buttonInteraction(interaction, args.slice(1));
-
-    await interaction.deferReply({ flags: MessageFlags.Ephemeral }).catch(() => {});
-    
-    const key = args.shift();
-    if (!key) return;
-    const command = handler.commands.get(key);
-    if (command?.buttonRun) return command.buttonRun(interaction, args);
-  }
-
-  if (!interaction.isChatInputCommand()) return;
-
-  /**
-   * 명령어 친사람만 보이게 설정
-   * flags: MessageFlags.Ephemeral
-   */
-  await interaction.deferReply({ flags: MessageFlags.Ephemeral }).catch(() => {});
-  handler.runCommand(interaction);
 }
\ No newline at end of file
diff --git a/bot/src/events/voiceStateUpdate.ts b/bot/src/events/voiceStateUpdate.ts
index 33d1b01..ed7a93c 100644
--- a/bot/src/events/voiceStateUpdate.ts
+++ b/bot/src/events/voiceStateUpdate.ts
@@ -1,5 +1,3 @@
+// TODO: 음성 상태 변경 이벤트 핸들러 (추후 구현)
 // import { VoiceState } from "discord.js";
-// import { client } from "../index";
-
-// export const voiceStateUpdate = async (oldState: VoiceState, newState: VoiceState): Promise<void> => {
-// }
\ No newline at end of file
+// export const voiceStateUpdate = async (oldState: VoiceState, newState: VoiceState): Promise<void> => {}
diff --git a/bot/src/types/Command.d.ts b/bot/src/types/Command.d.ts
index 1614605..c029781 100644
--- a/bot/src/types/Command.d.ts
+++ b/bot/src/types/Command.d.ts
@@ -1,4 +1,4 @@
-import { ButtonInteraction, ChatInputApplicationCommandData, ChatInputChatInputCommandInteraction, Message, StringSelectMenuInteraction } from "discord.js";
+import { ButtonInteraction, ChatInputApplicationCommandData, ChatInputCommandInteraction, Message, StringSelectMenuInteraction } from "discord.js";
 
 export interface Command {
   /** 메세지 이름 */
@@ -13,9 +13,9 @@ export interface Command {
    * 등록 메타: JSON 변환된 바디
    * (빌드 시 toJSON()해서 REST 등록에 사용)
    */
-  metaData: RESTPostAPIChatInputApplicationCommandsJSONBody;
+  metaData: ChatInputApplicationCommandData;
 
-  slashRun?: (args: ChatInputChatInputCommandInteraction) => Promise<void>;
+  slashRun?: (args: ChatInputCommandInteraction) => Promise<void>;
   messageRun?: (message: Message, args: string[]) => Promise<void>;
   menuRun?: (interaction: StringSelectMenuInteraction, args: string[]) => Promise<void>;
   buttonRun?: (interaction: ButtonInteraction, args: string[]) => Promise<void>;
diff --git a/bot/src/utils/Config.ts b/bot/src/utils/Config.ts
index c098904..91a3187 100644
--- a/bot/src/utils/Config.ts
+++ b/bot/src/utils/Config.ts
@@ -69,6 +69,8 @@ export const Config = {
     return this._youtube_cookie;
   },
 
+  proxyUrl: process.env.PROXY_URL?.trim() || "",
+
   _redis: {
     state: process.env.REDIS?.trim()?.toLocaleLowerCase() === "true",
     host: process.env.REDIS_HOST?.trim(),
diff --git a/bot/src/utils/Database.ts b/bot/src/utils/Database.ts
index b985391..92339d4 100644
--- a/bot/src/utils/Database.ts
+++ b/bot/src/utils/Database.ts
@@ -7,12 +7,18 @@ import { Logger } from "./Logger";
 
 const database = new Database(Config.dbPath);
 
-const schemaPath = join(process.cwd(), "db/schema.sql");
+const schemaPath = join(__dirname, "../../db/schema.sql");
 const schema = readFileSync(schemaPath, "utf-8");
 database.exec(schema);
 
 Logger.ready("DB 활성화!");
 
+// 허용되는 guild 테이블 컬럼 화이트리스���
+const GUILD_COLUMNS = new Set(["id", "name", "channel_id", "msg_id", "options"]);
+
+const filterKeys = (keys: string[], whitelist: Set<string>) =>
+  keys.filter(k => whitelist.has(k));
+
 const stmt = {
   guild: {
     // 전체
@@ -21,7 +27,7 @@ const stmt = {
     get: database.prepare("SELECT * FROM guilds WHERE ID = ?"),
     // 추가
     insert: (data: GuildRow) => {
-      const keys = Object.keys(data);
+      const keys = filterKeys(Object.keys(data), GUILD_COLUMNS);
       if (keys.length === 0) throw new Error("insert: 키1개는 있어야함");
       return database.prepare(`INSERT INTO guilds (${
         keys.map(k => `"${k}"`).join(", ")
@@ -31,35 +37,13 @@ const stmt = {
     },
     // 수정
     update: (data: GuildRow) => {
-      const keys = Object.keys(data).filter(k => k !== "id");
+      const keys = filterKeys(Object.keys(data), GUILD_COLUMNS).filter(k => k !== "id");
       if (keys.length === 0) throw new Error("update: 키1개는 있어야함");
       return database.prepare(`UPDATE guilds SET ${
         keys.map(k => `${k} = @${k}`).join(", ")
       } WHERE id = @id`).run(data);
     },
   },
-  // user: {
-  //   // 가져오기
-  //   get: database.prepare("SELECT * FROM users WHERE guild_id = ? AND id = ?"),
-  //   // 추가
-  //   insert: (data: UserType) => {
-  //     const keys = Object.keys(data);
-  //     if (keys.length === 0) throw new Error("insert: 키1개는 있어야함");
-  //     return database.prepare(`INSERT INTO users (${
-  //       keys.map(k => `"${k}"`).join(", ")
-  //     }) VALUES (${
-  //       keys.map(k => `@${k}`).join(", ")
-  //     })`).run(data);
-  //   },
-  //   // 수정
-  //   update: (data: UserType) => {
-  //     const keys = Object.keys(data).filter(k => k !== "guild_id" && k !== "id");
-  //     if (keys.length === 0) throw new Error("update: 키1개는 있어야함");
-  //     return database.prepare(`UPDATE users SET ${
-  //       keys.map(k => `${k} = @${k}`).join(", ")
-  //     } WHERE guild_id = @guild_id AND id = @id`).run(data);
-  //   },
-  // },
 };
 
 export const DB = {
@@ -91,27 +75,4 @@ export const DB = {
       }
     },
   },
-  // user: {
-  //   get(guildId: string, id: string) {
-  //     return stmt.user.get.get(guildId, id) as UserType | undefined;
-  //   },
-  //   set(data: UserType) {
-  //     try {
-  //       stmt.user.insert(data);
-  //       return true;
-  //     } catch (err) {
-  //       Logger.error(String(err));
-  //       return false;
-  //     }
-  //   },
-  //   update(data: UserType) {
-  //     try {
-  //       stmt.user.update(data);
-  //       return true;
-  //     } catch (err) {
-  //       Logger.error(String(err));
-  //       return false;
-  //     }
-  //   },
-  // },
 };
\ No newline at end of file
diff --git a/bot/src/utils/api/Spotify.ts b/bot/src/utils/api/Spotify.ts
index fbd1099..ceca9c6 100644
--- a/bot/src/utils/api/Spotify.ts
+++ b/bot/src/utils/api/Spotify.ts
@@ -8,7 +8,7 @@ const SPOTIFY_SECRET = process.env.SPOTIFY_SECRET?.trim() ?? "";
 
 const SPOTIFY_TOKEN_URL = "https://accounts.spotify.com/api/token";
 const SPOTIFY_API_URL = "https://api.spotify.com/v1";
-const TOKENR_URL = "http://192.168.10.5:8075/api/token";
+const TOKENR_URL = process.env.SPOTIFY_TOKENER_URL?.trim() || "http://192.168.10.5:8075/api/token";
 
 const searchCache = new Map<string, string>();
 
diff --git a/bot/src/utils/api/YoutubeMusic.ts b/bot/src/utils/api/YoutubeMusic.ts
index 470b1b9..f21cd7d 100644
--- a/bot/src/utils/api/YoutubeMusic.ts
+++ b/bot/src/utils/api/YoutubeMusic.ts
@@ -3,10 +3,11 @@ import crypto from "node:crypto";
 import { Cookies } from "../../types/Youtube_Cookie";
 import { Config } from "../Config";
 import { SongItem } from "../../types/Track";
+import { Logger } from "../Logger";
 
 const customPREF = "tz=Asia.Seoul&hl=ko&gl=KR&last_quality=1080";
 export const ORIGIN = "https://music.youtube.com";
-const proxy = new ProxyAgent('http://192.168.10.4:3128');
+const proxy = Config.proxyUrl ? new ProxyAgent(Config.proxyUrl) : undefined;
 const searchCache = new Map<string, string>();
 
 // 🌟 클래스 외부에 둘 상수 및 유틸리티 함수들 (내부에서만 사용됨)
@@ -56,7 +57,7 @@ export const YoutubeMusic = {
     const missing = keys.filter((k) => !(k in cookies) && !(blocks ?? []).includes(k));
 
     if (missing.length > 0) {
-      console.log("현재 입력된 쿠키 키 목록:", Object.keys(cookies));
+      Logger.warn(`현재 입력된 쿠키 키 목록: ${Object.keys(cookies).join(", ")}`);
       throw new Error(`❌ 필수 인증 쿠키가 누락되었습니다: ${missing.join(", ")}`);
     }
 
@@ -82,7 +83,7 @@ export const YoutubeMusic = {
    * 완벽한 쿠키 인증과 서명(SAPISIDHASH)을 사용하여 유튜브 뮤직 검색을 수행합니다.
    */
   async getSearchFull(query: string): Promise<SongItem[]> {
-    console.log(`🔍 [Auth-Cookie Engine] "${query}" 데이터 추출 중 (썸네일, 재생시간 포함)...`);
+    Logger.log(`🔍 [Auth-Cookie Engine] "${query}" 데이터 추출 중 (썸네일, 재생시간 포함)...`);
 
     const url = "https://music.youtube.com/youtubei/v1/search?prettyPrint=false";
 
@@ -109,7 +110,7 @@ export const YoutubeMusic = {
           query: query,
           params: "EgWKAQIIAWoOEAMQBBAQEAkQFRAKEBE="
         }),
-        dispatcher: proxy
+        ...(proxy ? { dispatcher: proxy } : {})
       });
 
       const data: any = await response.json();
@@ -200,9 +201,9 @@ export const YoutubeMusic = {
         }
       }
 
-      return results || []; // 배열이 비어있을 경우 안전하게 null 반환
+      return results;
     } catch (error) {
-      console.error("❌ getSearchFull 실행 중 에러:", error);
+      Logger.error(`❌ getSearchFull 실행 중 에러: ${String(error)}`);
       return [];
     }
   },
diff --git a/bot/src/utils/music/Button.ts b/bot/src/utils/music/Button.ts
index f879fc6..5db3d05 100644
--- a/bot/src/utils/music/Button.ts
+++ b/bot/src/utils/music/Button.ts
@@ -3,6 +3,7 @@ import { lavalinkManager } from "../../index";
 import { checkTextChannelAndMsg, getTextChannelAndMsg } from "./Channel";
 import { default_content, default_embed, default_image, getButtons } from "./Config";
 import { DB } from "../Database";
+import { Logger } from "../Logger";
 
 export const buttonInteraction = (interaction: ButtonInteraction, args: string[]) => {
   if (!interaction.guild) return;
@@ -16,7 +17,9 @@ export const buttonInteraction = (interaction: ButtonInteraction, args: string[]
   } else {
     if (args[0] === "recommend") buttonRecommend(interaction.guild);
   }
-  return interaction.deferUpdate().catch(() => {});
+  return interaction.deferUpdate().catch((err) => {
+    Logger.warn(`[Button] deferUpdate 실패: ${String(err)}`);
+  });
 }
 
 const buttonRecommend = async (guild: Guild) => {
@@ -33,7 +36,7 @@ const buttonRecommend = async (guild: Guild) => {
     components: [ getButtons() ],
     files: [ default_image ],
   }).catch((err) => {
-    console.error(err);
+    Logger.error(`[Button] 메세지 수정 실패: ${String(err)}`);
     return null;
   });
 }
\ No newline at end of file
diff --git a/bot/src/utils/music/Channel.ts b/bot/src/utils/music/Channel.ts
index abbe6de..5e8dced 100644
--- a/bot/src/utils/music/Channel.ts
+++ b/bot/src/utils/music/Channel.ts
@@ -6,15 +6,19 @@ import { clearAllMsg } from "./Utils";
 import { client } from "../../index";
 
 export const getGuildById = async (guildId: string): Promise<Guild | null> => {
-  const guild = client.guilds.cache.get(guildId)?.fetch();
+  const guild = await client.guilds.cache.get(guildId)?.fetch().catch(() => undefined);
   if (!guild) return null;
   return guild;
 }
 
 export const getMemberById = async (guild: Guild, userId: string): Promise<GuildMember | null> => {
-  const member = await guild.members.cache.get(userId)?.fetch(true);
-  if (!member) return null;
-  return member;
+  try {
+    const cached = guild.members.cache.get(userId);
+    if (!cached) return null;
+    return await cached.fetch(true);
+  } catch {
+    return null;
+  }
 }
 
 export const getVoiceChannel = (member: GuildMember): VoiceChannel | null => {
@@ -25,9 +29,14 @@ export const getVoiceChannel = (member: GuildMember): VoiceChannel | null => {
 
 export const getVoiceChannelById = async (guild: Guild, userId: string): Promise<VoiceChannel | null> => {
   if (!guild) return null;
-  const member = await guild.members.cache.get(userId)?.fetch(true);
-  if (!member) return null;
-  return getVoiceChannel(member);
+  try {
+    const cached = guild.members.cache.get(userId);
+    if (!cached) return null;
+    const member = await cached.fetch(true);
+    return getVoiceChannel(member);
+  } catch {
+    return null;
+  }
 }
 
 export const getTextChannelAndMsg = async (guild: Guild): Promise<{ channel?: TextChannel; msg?: Message; reason?: string; }> => {
diff --git a/bot/src/utils/shuffle.ts b/bot/src/utils/shuffle.ts
index ce5fe95..afa5b26 100644
--- a/bot/src/utils/shuffle.ts
+++ b/bot/src/utils/shuffle.ts
@@ -1,15 +1,8 @@
-export const fshuffle = (list: any[]): any[] => {
-  var i, j, x;
-  for (i=list.length; i; i-=1) {
-    j = Math.floor(Math.random()*i);
-    x = list[i-1];
-    list[i-1] = list[j];
-    list[j] = x;
+/** Fisher-Yates 셔플 (in-place) */
+export const shuffle = <T>(list: T[]): T[] => {
+  for (let i = list.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [list[i], list[j]] = [list[j], list[i]];
   }
   return list;
-}
-
-export const shuffle = (list: any[]): any[] => {
-  for (let z=0; z<5; z++) list = fshuffle(list);
-  return list;
 }
\ No newline at end of file