fix: Enhance temporary voice channel management with improved Discord API error handling for ghost channels and detailed logging.

prisma/schema.prisma

@@ -11,7 +11,7 @@ model GuildConfig {
   guildId      String   @id
   prefix       String   @default("!")
   mimicEnabled Boolean  @default(true)
-  locale        String?  // Server locale override (e.g. 'ko', 'en')
+  locale       String?
   createdAt    DateTime @default(now())
   updatedAt    DateTime @updatedAt
 }
@@ -26,18 +26,6 @@ model InviteRole {
   @@unique([guildId, inviteCode])
 }
 
-enum SubscriptionTier {
-  FREE
-  STANDARD
-  PRO
-  PREMIUM
-}
-
-enum DeleteCondition {
-  OWNER_LEAVE
-  EMPTY
-}
-
 model UserSubscription {
   userId    String           @id
   tier      SubscriptionTier @default(FREE)
@@ -49,8 +37,8 @@ model UserSubscription {
 model GuildOwnership {
   guildId   String           @id
   ownerId   String
-  owner       UserSubscription @relation(fields: [ownerId], references: [userId], onDelete: Cascade)
   createdAt DateTime         @default(now())
+  owner     UserSubscription @relation(fields: [ownerId], references: [userId], onDelete: Cascade)
 
   @@index([ownerId])
 }
@@ -86,8 +74,19 @@ model UserVoiceProfile {
 
 model UserLocale {
   userId    String   @id
-  locale    String   // User's personal locale (e.g. 'ko', 'en')
+  locale    String
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 }
 
+enum SubscriptionTier {
+  FREE
+  STANDARD
+  PRO
+  PREMIUM
+}
+
+enum DeleteCondition {
+  OWNER_LEAVE
+  EMPTY
+}

src/services/VoiceService.ts

@@ -63,6 +63,8 @@ export class VoiceService {
     const member = newState.member;
     if (!member) return;
 
+    logger.debug(`VoiceService: handleVoiceStateUpdate - old: ${oldState.channelId}, new: ${newState.channelId}`);
+
     if (!oldState.channelId && newState.channelId) {
       await this.handleJoin(newState);
     } else if (oldState.channelId && newState.channelId && oldState.channelId !== newState.channelId) {
@@ -82,7 +84,12 @@ export class VoiceService {
       where: { channelId }
     });
 
-    if (!generator) return;
+    if (!generator) {
+      logger.debug(`VoiceService: handleJoin - channel ${channelId} is NOT a generator`);
+      return;
+    }
+
+    logger.info(`VoiceService: handleJoin - detected generator join for ${member.user.tag} in ${channelId}`);
 
     const botMember = guild.members.me;
     if (!botMember?.permissions.has([
@@ -101,10 +108,18 @@ export class VoiceService {
     if (existingTemp) {
       try {
         await member.voice.setChannel(existingTemp.channelId);
-      } catch (e) {
+        return; // Success, moved to existing channel
-        logger.error(`${ErrorDefs.DISCORD_API_ERROR.code}: Could not move user to existing voice channel`, e);
+      } catch (e: any) {
+        // If the channel no longer exists in Discord, clean up DB and proceed to create new one
+        if (e.code === 10003 || e.status === 404) {
+          logger.warn(`VoiceService: Found ghost channel ${existingTemp.channelId} in DB. Cleaning up and creating fresh one.`);
+          await prisma.tempVoiceChannel.delete({ where: { channelId: existingTemp.channelId } }).catch(() => {});
+          // FALL THROUGH to channel creation logic below
+        } else {
+          logger.error(`${ErrorDefs.DISCORD_API_ERROR.code}: Unexpected error moving user to existing voice channel`, e);
+          return; // Stop for other errors to prevent spamming creations
+        }
       }
-      return;
     }
 
     // Resolve locale for this context
@@ -202,9 +217,14 @@ export class VoiceService {
         await channel.delete();
         await prisma.tempVoiceChannel.delete({ where: { channelId } });
         logger.info(`VoiceService: Successfully deleted temp channel ${channel.name}`);
-      } catch (error) {
+      } catch (error: any) {
-        logger.error(`${ErrorDefs.DISCORD_MISSING_PERMISSIONS.code}: Failed to delete channel ${channel.name}`, error);
+        // If already deleted in Discord, just clean up DB
-        // deliberately NOT deleting the database entry so it remains synchronized with Discord's state.
+        if (error.code === 10003 || error.status === 404) {
+          await prisma.tempVoiceChannel.delete({ where: { channelId } }).catch(() => {});
+          logger.info(`VoiceService: Purged ghost channel ${channelId} from DB`);
+        } else {
+          logger.error(`${ErrorDefs.DISCORD_MISSING_PERMISSIONS.code}: Failed to delete channel ${channelId}`, error);
+        }
       }
     } 
     else if (tempChannel.deleteWhen === 'EMPTY' && tempChannel.ownerId === member.id && channel.members.filter(m => !m.user.bot).size > 0) {