fix: re-enable CI lint job and fix ~65 lint errors (partial)

Re-enable the golangci-lint job in CI (disabled Oct 2025), update to
Go 1.25 and golangci-lint-action v7. Fix errcheck, gosimple S1009,
staticcheck SA4031 and SA2001 errors across 54 files. Remaining ~39
lint errors will be addressed in follow-up commits.

server/channelserver/compression/nullcomp/nullcomp.go

@@ -71,11 +71,11 @@ func Compress(rawData []byte) ([]byte, error) {
 					output = append(output, []byte{byte(nullCount)}...)
 					break
 				} else if i != 0 && nullCount != 0 {
-					r.UnreadByte()
+					_ = r.UnreadByte()
 					output = append(output, []byte{byte(nullCount)}...)
 					break
 				} else if i != 0 && nullCount == 0 {
-					r.UnreadByte()
+					_ = r.UnreadByte()
 					output = output[:len(output)-2]
 					output = append(output, []byte{byte(0xFF)}...)
 					break

server/channelserver/handlers.go

@@ -80,7 +80,7 @@ func doAckSimpleFail(s *Session, ackHandle uint32, data []byte) {
 
 func updateRights(s *Session) {
 	rightsInt := uint32(2)
-	s.server.db.QueryRow("SELECT rights FROM users u INNER JOIN characters c ON u.id = c.user_id WHERE c.id = $1", s.charID).Scan(&rightsInt)
+	_ = s.server.db.QueryRow("SELECT rights FROM users u INNER JOIN characters c ON u.id = c.user_id WHERE c.id = $1", s.charID).Scan(&rightsInt)
 	s.courses, rightsInt = mhfcourse.GetCourseStruct(rightsInt)
 	update := &mhfpacket.MsgSysUpdateRight{
 		ClientRespAckHandle: 0,
@@ -303,7 +303,7 @@ func logoutPlayer(s *Session) {
 		if mhfcourse.CourseExists(30, s.courses) {
 			rpGained = timePlayed / 900
 			timePlayed = timePlayed % 900
-			s.server.db.Exec("UPDATE characters SET cafe_time=cafe_time+$1 WHERE id=$2", sessionTime, s.charID)
+			_, _ = s.server.db.Exec("UPDATE characters SET cafe_time=cafe_time+$1 WHERE id=$2", sessionTime, s.charID)
 		} else {
 			rpGained = timePlayed / 1800
 			timePlayed = timePlayed % 1800
@@ -329,8 +329,8 @@ func logoutPlayer(s *Session) {
 		}
 
 		// Update time_played and guild treasure hunt
-		s.server.db.Exec("UPDATE characters SET time_played = $1 WHERE id = $2", timePlayed, s.charID)
-		s.server.db.Exec(`UPDATE guild_characters SET treasure_hunt=NULL WHERE character_id=$1`, s.charID)
+		_, _ = s.server.db.Exec("UPDATE characters SET time_played = $1 WHERE id = $2", timePlayed, s.charID)
+		_, _ = s.server.db.Exec(`UPDATE guild_characters SET treasure_hunt=NULL WHERE character_id=$1`, s.charID)
 	}
 
 	// NOW do cleanup (after save is complete)
@@ -449,7 +449,7 @@ func handleMsgSysRecordLog(s *Session, p mhfpacket.MHFPacket) {
 		for i := 0; i < 176; i++ {
 			val = bf.ReadUint8()
 			if val > 0 && mhfmon.Monsters[i].Large {
-				s.server.db.Exec(`INSERT INTO kill_logs (character_id, monster, quantity, timestamp) VALUES ($1, $2, $3, $4)`, s.charID, i, val, TimeAdjusted())
+				_, _ = s.server.db.Exec(`INSERT INTO kill_logs (character_id, monster, quantity, timestamp) VALUES ($1, $2, $3, $4)`, s.charID, i, val, TimeAdjusted())
 			}
 		}
 	}
@@ -665,7 +665,7 @@ func handleMsgMhfTransitMessage(s *Session, p mhfpacket.MHFPacket) {
 				}
 				if strings.HasPrefix(stage.id, findPartyParams.StagePrefix) {
 					sb3 := byteframe.NewByteFrameFromBytes(stage.rawBinaryData[stageBinaryKey{1, 3}])
-					sb3.Seek(4, 0)
+					_, _ = sb3.Seek(4, 0)
 
 					stageDataParams := 7
 					if _config.ErupeConfig.RealClientMode <= _config.G10 {
@@ -741,7 +741,7 @@ func handleMsgMhfTransitMessage(s *Session, p mhfpacket.MHFPacket) {
 			}
 		}
 	}
-	resp.Seek(0, io.SeekStart)
+	_, _ = resp.Seek(0, io.SeekStart)
 	resp.WriteUint16(count)
 	doAckBufSucceed(s, pkt.AckHandle, resp.Data())
 }
@@ -954,7 +954,7 @@ func handleMsgMhfGetExtraInfo(s *Session, p mhfpacket.MHFPacket) {}
 func userGetItems(s *Session) []mhfitem.MHFItemStack {
 	var data []byte
 	var items []mhfitem.MHFItemStack
-	s.server.db.QueryRow(`SELECT item_box FROM users u WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$1)`, s.charID).Scan(&data)
+	_ = s.server.db.QueryRow(`SELECT item_box FROM users u WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$1)`, s.charID).Scan(&data)
 	if len(data) > 0 {
 		box := byteframe.NewByteFrameFromBytes(data)
 		numStacks := box.ReadUint16()
@@ -977,7 +977,7 @@ func handleMsgMhfEnumerateUnionItem(s *Session, p mhfpacket.MHFPacket) {
 func handleMsgMhfUpdateUnionItem(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfUpdateUnionItem)
 	newStacks := mhfitem.DiffItemStacks(userGetItems(s), pkt.UpdatedItems)
-	s.server.db.Exec(`UPDATE users u SET item_box=$1 WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$2)`, mhfitem.SerializeWarehouseItems(newStacks), s.charID)
+	_, _ = s.server.db.Exec(`UPDATE users u SET item_box=$1 WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$2)`, mhfitem.SerializeWarehouseItems(newStacks), s.charID)
 	doAckSimpleSucceed(s, pkt.AckHandle, make([]byte, 4))
 }
 
@@ -990,17 +990,17 @@ func handleMsgMhfCheckWeeklyStamp(s *Session, p mhfpacket.MHFPacket) {
 	err := s.server.db.QueryRow(fmt.Sprintf("SELECT %s_checked FROM stamps WHERE character_id=$1", pkt.StampType), s.charID).Scan(&lastCheck)
 	if err != nil {
 		lastCheck = TimeAdjusted()
-		s.server.db.Exec("INSERT INTO stamps (character_id, hl_checked, ex_checked) VALUES ($1, $2, $2)", s.charID, TimeAdjusted())
+		_, _ = s.server.db.Exec("INSERT INTO stamps (character_id, hl_checked, ex_checked) VALUES ($1, $2, $2)", s.charID, TimeAdjusted())
 	} else {
-		s.server.db.Exec(fmt.Sprintf(`UPDATE stamps SET %s_checked=$1 WHERE character_id=$2`, pkt.StampType), TimeAdjusted(), s.charID)
+		_, _ = s.server.db.Exec(fmt.Sprintf(`UPDATE stamps SET %s_checked=$1 WHERE character_id=$2`, pkt.StampType), TimeAdjusted(), s.charID)
 	}
 
 	if lastCheck.Before(TimeWeekStart()) {
-		s.server.db.Exec(fmt.Sprintf("UPDATE stamps SET %s_total=%s_total+1 WHERE character_id=$1", pkt.StampType, pkt.StampType), s.charID)
+		_, _ = s.server.db.Exec(fmt.Sprintf("UPDATE stamps SET %s_total=%s_total+1 WHERE character_id=$1", pkt.StampType, pkt.StampType), s.charID)
 		updated = 1
 	}
 
-	s.server.db.QueryRow(fmt.Sprintf("SELECT %s_total, %s_redeemed FROM stamps WHERE character_id=$1", pkt.StampType, pkt.StampType), s.charID).Scan(&total, &redeemed)
+	_ = s.server.db.QueryRow(fmt.Sprintf("SELECT %s_total, %s_redeemed FROM stamps WHERE character_id=$1", pkt.StampType, pkt.StampType), s.charID).Scan(&total, &redeemed)
 	bf := byteframe.NewByteFrame()
 	bf.WriteUint16(total)
 	bf.WriteUint16(redeemed)
@@ -1016,10 +1016,10 @@ func handleMsgMhfExchangeWeeklyStamp(s *Session, p mhfpacket.MHFPacket) {
 	var total, redeemed uint16
 	var tktStack mhfitem.MHFItemStack
 	if pkt.Unk1 == 10 { // Yearly Sub Ex
-		s.server.db.QueryRow("UPDATE stamps SET hl_total=hl_total-48, hl_redeemed=hl_redeemed-48 WHERE character_id=$1 RETURNING hl_total, hl_redeemed", s.charID).Scan(&total, &redeemed)
+		_ = s.server.db.QueryRow("UPDATE stamps SET hl_total=hl_total-48, hl_redeemed=hl_redeemed-48 WHERE character_id=$1 RETURNING hl_total, hl_redeemed", s.charID).Scan(&total, &redeemed)
 		tktStack = mhfitem.MHFItemStack{Item: mhfitem.MHFItem{ItemID: 2210}, Quantity: 1}
 	} else {
-		s.server.db.QueryRow(fmt.Sprintf("UPDATE stamps SET %s_redeemed=%s_redeemed+8 WHERE character_id=$1 RETURNING %s_total, %s_redeemed", pkt.StampType, pkt.StampType, pkt.StampType, pkt.StampType), s.charID).Scan(&total, &redeemed)
+		_ = s.server.db.QueryRow(fmt.Sprintf("UPDATE stamps SET %s_redeemed=%s_redeemed+8 WHERE character_id=$1 RETURNING %s_total, %s_redeemed", pkt.StampType, pkt.StampType, pkt.StampType, pkt.StampType), s.charID).Scan(&total, &redeemed)
 		if pkt.StampType == "hl" {
 			tktStack = mhfitem.MHFItemStack{Item: mhfitem.MHFItem{ItemID: 1630}, Quantity: 5}
 		} else {
@@ -1043,7 +1043,7 @@ func getGoocooData(s *Session, cid uint32) [][]byte {
 	for i := 0; i < 5; i++ {
 		err := s.server.db.QueryRow(fmt.Sprintf("SELECT goocoo%d FROM goocoo WHERE id=$1", i), cid).Scan(&goocoo)
 		if err != nil {
-			s.server.db.Exec("INSERT INTO goocoo (id) VALUES ($1)", s.charID)
+			_, _ = s.server.db.Exec("INSERT INTO goocoo (id) VALUES ($1)", s.charID)
 			return goocoos
 		}
 		if err == nil && goocoo != nil {
@@ -1216,7 +1216,7 @@ func handleMsgMhfStampcardStamp(s *Session, p mhfpacket.MHFPacket) {
 	}
 	var stamps, rewardTier, rewardUnk uint16
 	reward := mhfitem.MHFItemStack{Item: mhfitem.MHFItem{}}
-	s.server.db.QueryRow(`UPDATE characters SET stampcard = stampcard + $1 WHERE id = $2 RETURNING stampcard`, pkt.Stamps, s.charID).Scan(&stamps)
+	_ = s.server.db.QueryRow(`UPDATE characters SET stampcard = stampcard + $1 WHERE id = $2 RETURNING stampcard`, pkt.Stamps, s.charID).Scan(&stamps)
 	bf.WriteUint16(stamps - pkt.Stamps)
 	bf.WriteUint16(stamps)
 
@@ -1578,7 +1578,7 @@ func handleMsgMhfGetTrendWeapon(s *Session, p mhfpacket.MHFPacket) {
 		j := 0
 		for rows.Next() {
 			trendWeapons[i][j].WeaponType = i
-			rows.Scan(&trendWeapons[i][j].WeaponID)
+			_ = rows.Scan(&trendWeapons[i][j].WeaponID)
 			j++
 		}
 	}

server/channelserver/handlers_achievement.go

@@ -131,7 +131,7 @@ func handleMsgMhfGetAchievement(s *Session, p mhfpacket.MHFPacket) {
 		resp.WriteUint16(0) // Unk
 		resp.WriteUint32(achData.Progress)
 	}
-	resp.Seek(0, io.SeekStart)
+	_, _ = resp.Seek(0, io.SeekStart)
 	resp.WriteUint32(points)
 	resp.WriteUint32(points)
 	resp.WriteUint32(points)

server/channelserver/handlers_cafe.go

@@ -54,7 +54,7 @@ func handleMsgMhfCheckDailyCafepoint(s *Session, p mhfpacket.MHFPacket) {
 	var bondBonus, bonusQuests, dailyQuests uint32
 	bf := byteframe.NewByteFrame()
 	if midday.After(dailyTime) {
-		addPointNetcafe(s, 5)
+		_ = addPointNetcafe(s, 5)
 		bondBonus = 5 // Bond point bonus quests
 		bonusQuests = s.server.erupeConfig.GameplayOptions.BonusQuestAllowance
 		dailyQuests = s.server.erupeConfig.GameplayOptions.DailyQuestAllowance
@@ -196,7 +196,7 @@ func handleMsgMhfPostCafeDurationBonusReceived(s *Session, p mhfpacket.MHFPacket
 		`, cbID).Scan(&cafeBonus.ID, &cafeBonus.ItemType, &cafeBonus.Quantity)
 		if err == nil {
 			if cafeBonus.ItemType == 17 {
-				addPointNetcafe(s, int(cafeBonus.Quantity))
+				_ = addPointNetcafe(s, int(cafeBonus.Quantity))
 			}
 		}
 		s.server.db.Exec("INSERT INTO public.cafe_accepted VALUES ($1, $2)", cbID, s.charID)

server/channelserver/handlers_cast_binary.go

@@ -46,7 +46,7 @@ func init() {
 	zapConfig := zap.NewDevelopmentConfig()
 	zapConfig.DisableCaller = true
 	zapLogger, _ := zapConfig.Build()
-	defer zapLogger.Sync()
+	defer func() { _ = zapLogger.Sync() }()
 	logger := zapLogger.Named("commands")
 	cmds := _config.ErupeConfig.Commands
 	for _, cmd := range cmds {
@@ -74,7 +74,7 @@ func sendServerChatMessage(s *Session, message string) {
 		Message:    message,
 		SenderName: "Erupe",
 	}
-	msgBinChat.Build(bf)
+	_ = msgBinChat.Build(bf)
 
 	castedBin := &mhfpacket.MsgSysCastedBinary{
 		CharID:         0,
@@ -191,7 +191,7 @@ func parseChatCommand(s *Session, command string) {
 				}
 				temp = &mhfpacket.MsgSysDeleteObject{ObjID: object.id}
 				deleteNotif.WriteUint16(uint16(temp.Opcode()))
-				temp.Build(deleteNotif, s.clientContext)
+				_ = temp.Build(deleteNotif, s.clientContext)
 			}
 			for _, session := range s.server.sessions {
 				if s == session {
@@ -199,7 +199,7 @@ func parseChatCommand(s *Session, command string) {
 				}
 				temp = &mhfpacket.MsgSysDeleteUser{CharID: session.charID}
 				deleteNotif.WriteUint16(uint16(temp.Opcode()))
-				temp.Build(deleteNotif, s.clientContext)
+				_ = temp.Build(deleteNotif, s.clientContext)
 			}
 			deleteNotif.WriteUint16(uint16(network.MSG_SYS_END))
 			s.QueueSendNonBlocking(deleteNotif.Data())
@@ -211,14 +211,14 @@ func parseChatCommand(s *Session, command string) {
 				}
 				temp = &mhfpacket.MsgSysInsertUser{CharID: session.charID}
 				reloadNotif.WriteUint16(uint16(temp.Opcode()))
-				temp.Build(reloadNotif, s.clientContext)
+				_ = temp.Build(reloadNotif, s.clientContext)
 				for i := 0; i < 3; i++ {
 					temp = &mhfpacket.MsgSysNotifyUserBinary{
 						CharID:     session.charID,
 						BinaryType: uint8(i + 1),
 					}
 					reloadNotif.WriteUint16(uint16(temp.Opcode()))
-					temp.Build(reloadNotif, s.clientContext)
+					_ = temp.Build(reloadNotif, s.clientContext)
 				}
 			}
 			for _, obj := range s.stage.objects {
@@ -234,7 +234,7 @@ func parseChatCommand(s *Session, command string) {
 					OwnerCharID: obj.ownerCharID,
 				}
 				reloadNotif.WriteUint16(uint16(temp.Opcode()))
-				temp.Build(reloadNotif, s.clientContext)
+				_ = temp.Build(reloadNotif, s.clientContext)
 			}
 			reloadNotif.WriteUint16(uint16(network.MSG_SYS_END))
 			s.QueueSendNonBlocking(reloadNotif.Data())
@@ -404,7 +404,7 @@ func parseChatCommand(s *Session, command string) {
 			err := s.server.db.QueryRow(`SELECT discord_token FROM users u WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$1)`, s.charID).Scan(&_token)
 			if err != nil {
 				randToken := make([]byte, 4)
-				rand.Read(randToken)
+				_, _ = rand.Read(randToken)
 				_token = fmt.Sprintf("%x-%x", randToken[:2], randToken[2:])
 				s.server.db.Exec(`UPDATE users u SET discord_token = $1 WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$2)`, _token, s.charID)
 			}
@@ -469,7 +469,7 @@ func handleMsgSysCastBinary(s *Session, p mhfpacket.MHFPacket) {
 	var returnToSender bool
 	if pkt.MessageType == BinaryMessageTypeChat {
 		tmp.SetLE()
-		tmp.Seek(8, 0)
+		_, _ = tmp.Seek(8, 0)
 		message = string(tmp.ReadNullTerminatedBytes())
 		author = string(tmp.ReadNullTerminatedBytes())
 	}
@@ -478,7 +478,7 @@ func handleMsgSysCastBinary(s *Session, p mhfpacket.MHFPacket) {
 	realPayload := pkt.RawDataPayload
 	if pkt.BroadcastType == BroadcastTypeTargeted {
 		tmp.SetBE()
-		tmp.Seek(0, 0)
+		_, _ = tmp.Seek(0, 0)
 		msgBinTargeted = &binpacket.MsgBinTargeted{}
 		err := msgBinTargeted.Parse(tmp)
 		if err != nil {
@@ -497,13 +497,13 @@ func handleMsgSysCastBinary(s *Session, p mhfpacket.MHFPacket) {
 			}
 			bf := byteframe.NewByteFrame()
 			bf.SetLE()
-			m.Build(bf)
+			_ = m.Build(bf)
 			realPayload = bf.Data()
 		} else {
 			bf := byteframe.NewByteFrameFromBytes(pkt.RawDataPayload)
 			bf.SetLE()
 			chatMessage := &binpacket.MsgBinChat{}
-			chatMessage.Parse(bf)
+			_ = chatMessage.Parse(bf)
 			if strings.HasPrefix(chatMessage.Message, s.server.erupeConfig.CommandPrefix) {
 				parseChatCommand(s, chatMessage.Message)
 				return

server/channelserver/handlers_cast_binary_test.go

@@ -122,7 +122,7 @@ func TestHandleMsgSysCastBinary_DiceCommand(t *testing.T) {
 		Message:    "@dice",
 		SenderName: "TestPlayer",
 	}
-	msg.Build(bf)
+	_ = msg.Build(bf)
 
 	pkt := &mhfpacket.MsgSysCastBinary{
 		Unk:            0,
@@ -157,7 +157,7 @@ func TestBroadcastTypes(t *testing.T) {
 					TargetCharIDs: []uint32{1, 2, 3},
 					RawDataPayload: []byte{0xDE, 0xAD, 0xBE, 0xEF},
 				}
-				msg.Build(bf)
+				_ = msg.Build(bf)
 				return bf.Data()
 			},
 		},
@@ -245,7 +245,7 @@ func TestBinaryMessageTypes(t *testing.T) {
 					Message:    "test",
 					SenderName: "Player",
 				}
-				msg.Build(bf)
+				_ = msg.Build(bf)
 				return bf.Data()
 			},
 		},
@@ -429,12 +429,12 @@ func TestChatMessageParsing(t *testing.T) {
 				Message:    tt.messageContent,
 				SenderName: tt.authorName,
 			}
-			msg.Build(bf)
+			_ = msg.Build(bf)
 
 			// Parse it back
 			parseBf := byteframe.NewByteFrameFromBytes(bf.Data())
 			parseBf.SetLE()
-			parseBf.Seek(8, 0) // Skip initial bytes
+			_, _ = parseBf.Seek(8, 0) // Skip initial bytes
 
 			message := string(parseBf.ReadNullTerminatedBytes())
 			author := string(parseBf.ReadNullTerminatedBytes())

server/channelserver/handlers_character_test.go

@@ -572,7 +572,7 @@ func BenchmarkCompress(b *testing.B) {
 
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		save.Compress()
+		_ = save.Compress()
 	}
 }
 
@@ -587,6 +587,6 @@ func BenchmarkDecompress(b *testing.B) {
 
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		save.Decompress()
+		_ = save.Decompress()
 	}
 }

server/channelserver/handlers_clients.go

@@ -77,7 +77,7 @@ func handleMsgMhfListMember(s *Session, p mhfpacket.MHFPacket) {
 			resp.WriteBytes(stringsupport.PaddedString(name, 16, true))
 		}
 	}
-	resp.Seek(0, 0)
+	_, _ = resp.Seek(0, 0)
 	resp.WriteUint32(count)
 	doAckBufSucceed(s, pkt.AckHandle, resp.Data())
 }

server/channelserver/handlers_data_extended_test.go

@@ -613,8 +613,8 @@ func TestSaveDataSerialization(t *testing.T) {
 
 			// Simulate binary serialization
 			buf := new(bytes.Buffer)
-			binary.Write(buf, binary.LittleEndian, savedata.CharID)
-			binary.Write(buf, binary.LittleEndian, savedata.Playtime)
+			_ = binary.Write(buf, binary.LittleEndian, savedata.CharID)
+			_ = binary.Write(buf, binary.LittleEndian, savedata.Playtime)
 
 			// Should have 8 bytes (4 + 4)
 			if buf.Len() != 8 {
@@ -625,8 +625,8 @@ func TestSaveDataSerialization(t *testing.T) {
 			data := buf.Bytes()
 			var charID uint32
 			var playtime uint32
-			binary.Read(bytes.NewReader(data), binary.LittleEndian, &charID)
-			binary.Read(bytes.NewReader(data[4:]), binary.LittleEndian, &playtime)
+			_ = binary.Read(bytes.NewReader(data), binary.LittleEndian, &charID)
+			_ = binary.Read(bytes.NewReader(data[4:]), binary.LittleEndian, &playtime)
 
 			if charID != tt.charID || playtime != tt.playtime {
 				t.Error("serialization round-trip failed")

server/channelserver/handlers_data_test.go

@@ -179,10 +179,10 @@ func TestAckPacketStructure(t *testing.T) {
 			var buf bytes.Buffer
 
 			// Write opcode (2 bytes, big endian)
-			binary.Write(&buf, binary.BigEndian, uint16(network.MSG_SYS_ACK))
+			_ = binary.Write(&buf, binary.BigEndian, uint16(network.MSG_SYS_ACK))
 
 			// Write ack handle (4 bytes, big endian)
-			binary.Write(&buf, binary.BigEndian, tt.ackHandle)
+			_ = binary.Write(&buf, binary.BigEndian, tt.ackHandle)
 
 			// Write data
 			buf.Write(tt.data)
@@ -590,7 +590,7 @@ func TestSaveDataCorruptionDetection_Integration(t *testing.T) {
 
 	// Check that database wasn't updated with corrupted data
 	var savedName string
-	db.QueryRow("SELECT name FROM characters WHERE id = $1", charID).Scan(&savedName)
+	_ = db.QueryRow("SELECT name FROM characters WHERE id = $1", charID).Scan(&savedName)
 	if savedName == "HackedName" {
 		t.Error("corrupted save data was incorrectly written to database")
 	}

server/channelserver/handlers_discord.go

@@ -15,7 +15,7 @@ func (s *Server) onInteraction(ds *discordgo.Session, i *discordgo.InteractionCr
 		var temp string
 		err := s.db.QueryRow(`UPDATE users SET discord_id = $1 WHERE discord_token = $2 RETURNING discord_id`, i.Member.User.ID, i.ApplicationCommandData().Options[0].StringValue()).Scan(&temp)
 		if err == nil {
-			ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+			_ = ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
 				Type: discordgo.InteractionResponseChannelMessageWithSource,
 				Data: &discordgo.InteractionResponseData{
 					Content: "Your Erupe account was linked successfully.",
@@ -23,7 +23,7 @@ func (s *Server) onInteraction(ds *discordgo.Session, i *discordgo.InteractionCr
 				},
 			})
 		} else {
-			ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+			_ = ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
 				Type: discordgo.InteractionResponseChannelMessageWithSource,
 				Data: &discordgo.InteractionResponseData{
 					Content: "Failed to link Erupe account.",
@@ -35,7 +35,7 @@ func (s *Server) onInteraction(ds *discordgo.Session, i *discordgo.InteractionCr
 		password, _ := bcrypt.GenerateFromPassword([]byte(i.ApplicationCommandData().Options[0].StringValue()), 10)
 		_, err := s.db.Exec(`UPDATE users SET password = $1 WHERE discord_id = $2`, password, i.Member.User.ID)
 		if err == nil {
-			ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+			_ = ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
 				Type: discordgo.InteractionResponseChannelMessageWithSource,
 				Data: &discordgo.InteractionResponseData{
 					Content: "Your Erupe account password has been updated.",
@@ -43,7 +43,7 @@ func (s *Server) onInteraction(ds *discordgo.Session, i *discordgo.InteractionCr
 				},
 			})
 		} else {
-			ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+			_ = ds.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
 				Type: discordgo.InteractionResponseChannelMessageWithSource,
 				Data: &discordgo.InteractionResponseData{
 					Content: "Failed to update Erupe account password.",

server/channelserver/handlers_diva.go

@@ -71,7 +71,7 @@ func handleMsgMhfGetUdSchedule(s *Session, p mhfpacket.MHFPacket) {
 	} else {
 		defer rows.Close()
 		for rows.Next() {
-			rows.Scan(&id, &start)
+			_ = rows.Scan(&id, &start)
 		}
 	}
 

server/channelserver/handlers_event.go

@@ -142,7 +142,7 @@ func handleMsgMhfGetKeepLoginBoostStatus(s *Session, p mhfpacket.MHFPacket) {
 	}
 	for rows.Next() {
 		var temp loginBoost
-		rows.StructScan(&temp)
+		_ = rows.StructScan(&temp)
 		loginBoosts = append(loginBoosts, temp)
 	}
 	if len(loginBoosts) == 0 {

server/channelserver/handlers_festa.go

@@ -177,7 +177,7 @@ func handleMsgMhfInfoFesta(s *Session, p mhfpacket.MHFPacket) {
 	} else {
 		defer rows.Close()
 		for rows.Next() {
-			rows.Scan(&id, &start)
+			_ = rows.Scan(&id, &start)
 		}
 	}
 

server/channelserver/handlers_guild.go

@@ -678,13 +678,13 @@ func handleMsgMhfOperateGuild(s *Session, p mhfpacket.MHFPacket) {
 					guild.LeaderCharID = guildMembers[i].CharID
 					guildMembers[0].OrderIndex = guildMembers[i].OrderIndex
 					guildMembers[i].OrderIndex = 1
-					guildMembers[0].Save(s)
-					guildMembers[i].Save(s)
+					_ = guildMembers[0].Save(s)
+					_ = guildMembers[i].Save(s)
 					bf.WriteUint32(guildMembers[i].CharID)
 					break
 				}
 			}
-			guild.Save(s)
+			_ = guild.Save(s)
 		}
 	case mhfpacket.OperateGuildApply:
 		err = guild.CreateApplication(s, s.charID, GuildApplicationTypeApplied, nil)
@@ -709,7 +709,7 @@ func handleMsgMhfOperateGuild(s *Session, p mhfpacket.MHFPacket) {
 				Body:            fmt.Sprintf("You have withdrawn from 「%s」.", guild.Name),
 				IsSystemMessage: true,
 			}
-			mail.Send(s, nil)
+			_ = mail.Send(s, nil)
 		}
 		bf.WriteUint32(uint32(response))
 	case mhfpacket.OperateGuildDonateRank:
@@ -728,7 +728,7 @@ func handleMsgMhfOperateGuild(s *Session, p mhfpacket.MHFPacket) {
 			return
 		}
 		guild.Comment = stringsupport.SJISToUTF8(pkt.Data2.ReadNullTerminatedBytes())
-		guild.Save(s)
+		_ = guild.Save(s)
 	case mhfpacket.OperateGuildUpdateMotto:
 		if !characterGuildInfo.IsLeader && !characterGuildInfo.IsSubLeader() {
 			doAckSimpleFail(s, pkt.AckHandle, make([]byte, 4))
@@ -737,7 +737,7 @@ func handleMsgMhfOperateGuild(s *Session, p mhfpacket.MHFPacket) {
 		_ = pkt.Data1.ReadUint16()
 		guild.SubMotto = pkt.Data1.ReadUint8()
 		guild.MainMotto = pkt.Data1.ReadUint8()
-		guild.Save(s)
+		_ = guild.Save(s)
 	case mhfpacket.OperateGuildRenamePugi1:
 		handleRenamePugi(s, pkt.Data2, guild, 1)
 	case mhfpacket.OperateGuildRenamePugi2:
@@ -788,7 +788,7 @@ func handleRenamePugi(s *Session, bf *byteframe.ByteFrame, guild *Guild, num int
 	default:
 		guild.PugiName3 = name
 	}
-	guild.Save(s)
+	_ = guild.Save(s)
 }
 
 func handleChangePugi(s *Session, outfit uint8, guild *Guild, num int) {
@@ -800,7 +800,7 @@ func handleChangePugi(s *Session, outfit uint8, guild *Guild, num int) {
 	case 3:
 		guild.PugiOutfit3 = outfit
 	}
-	guild.Save(s)
+	_ = guild.Save(s)
 }
 
 func handleDonateRP(s *Session, amount uint16, guild *Guild, _type int) []byte {
@@ -912,7 +912,7 @@ func handleMsgMhfOperateGuildMember(s *Session, p mhfpacket.MHFPacket) {
 	if err != nil {
 		doAckSimpleFail(s, pkt.AckHandle, make([]byte, 4))
 	} else {
-		mail.Send(s, nil)
+		_ = mail.Send(s, nil)
 		for _, channel := range s.server.Channels {
 			for _, session := range channel.sessions {
 				if session.charID == pkt.CharID {

server/channelserver/handlers_guild_scout.go

@@ -182,7 +182,7 @@ func handleMsgMhfAnswerGuildScout(s *Session, p mhfpacket.MHFPacket) {
 		bf.WriteUint32(guild.ID)
 		doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 		for _, m := range mail {
-			m.Send(s, nil)
+			_ = m.Send(s, nil)
 		}
 	}
 }

server/channelserver/handlers_mail.go

@@ -174,7 +174,7 @@ func SendMailNotification(s *Session, m *Mail, recipient *Session) {
 		SenderName: getCharacterName(s, m.SenderID),
 	}
 
-	notification.Build(bf)
+	_ = notification.Build(bf)
 
 	castedBinary := &mhfpacket.MsgSysCastedBinary{
 		CharID:         m.SenderID,
@@ -183,7 +183,7 @@ func SendMailNotification(s *Session, m *Mail, recipient *Session) {
 		RawDataPayload: bf.Data(),
 	}
 
-	castedBinary.Build(bf, s.clientContext)
+	_ = castedBinary.Build(bf, s.clientContext)
 
 	recipient.QueueSendMHFNonBlocking(castedBinary)
 }

server/channelserver/handlers_mercenary.go

@@ -325,7 +325,7 @@ func handleMsgMhfSaveOtomoAirou(s *Session, p mhfpacket.MHFPacket) {
 		}
 	}
 	save.WriteBytes(bf.DataFromCurrent())
-	save.Seek(0, 0)
+	_, _ = save.Seek(0, 0)
 	save.WriteUint8(catsExist)
 	comp, err := nullcomp.Compress(save.Data())
 	if err != nil {

server/channelserver/handlers_mercenary_test.go

@@ -39,7 +39,7 @@ func buildCatBytes(cats []Airou) []byte {
 	for _, cat := range cats {
 		catBuf := new(bytes.Buffer)
 		// ID (uint32)
-		binary.Write(catBuf, binary.BigEndian, cat.ID)
+		_ = binary.Write(catBuf, binary.BigEndian, cat.ID)
 		// 1 byte skip (unknown bool)
 		catBuf.WriteByte(0)
 		// Name (18 bytes)
@@ -57,17 +57,17 @@ func buildCatBytes(cats []Airou) []byte {
 		// 5 bytes skip (affection and colour sliders)
 		catBuf.Write(make([]byte, 5))
 		// Experience (uint32)
-		binary.Write(catBuf, binary.BigEndian, cat.Experience)
+		_ = binary.Write(catBuf, binary.BigEndian, cat.Experience)
 		// 1 byte skip (bool for weapon equipped)
 		catBuf.WriteByte(0)
 		// WeaponType (uint8)
 		catBuf.WriteByte(cat.WeaponType)
 		// WeaponID (uint16)
-		binary.Write(catBuf, binary.BigEndian, cat.WeaponID)
+		_ = binary.Write(catBuf, binary.BigEndian, cat.WeaponID)
 
 		catData := catBuf.Bytes()
 		// catDefLen (uint32) - total length of the cat data after this field
-		binary.Write(buf, binary.BigEndian, uint32(len(catData)))
+		_ = binary.Write(buf, binary.BigEndian, uint32(len(catData)))
 		buf.Write(catData)
 	}
 	return buf.Bytes()
@@ -174,7 +174,7 @@ func TestGetAirouDetails_ExtraTrailingBytes(t *testing.T) {
 	buf.WriteByte(1) // catCount = 1
 
 	catBuf := new(bytes.Buffer)
-	binary.Write(catBuf, binary.BigEndian, uint32(99))  // catID
+	_ = binary.Write(catBuf, binary.BigEndian, uint32(99))  // catID
 	catBuf.WriteByte(0)                                 // skip
 	catBuf.Write(make([]byte, 18))                      // name
 	catBuf.WriteByte(3)                                 // currentTask
@@ -182,7 +182,7 @@ func TestGetAirouDetails_ExtraTrailingBytes(t *testing.T) {
 	catBuf.WriteByte(1)                                 // personality
 	catBuf.WriteByte(2)                                 // class
 	catBuf.Write(make([]byte, 5))                       // affection skip
-	binary.Write(catBuf, binary.BigEndian, uint32(500)) // experience
+	_ = binary.Write(catBuf, binary.BigEndian, uint32(500)) // experience
 	catBuf.WriteByte(0)                                 // weapon equipped bool
 	catBuf.WriteByte(6)                                 // weaponType
 	binary.Write(catBuf, binary.BigEndian, uint16(50))  // weaponID

server/channelserver/handlers_quest.go

@@ -227,7 +227,7 @@ func loadQuestFile(s *Session, questId int) []byte {
 	}
 	fileBytes := byteframe.NewByteFrameFromBytes(decrypted)
 	fileBytes.SetLE()
-	fileBytes.Seek(int64(fileBytes.ReadUint32()), 0)
+	_, _ = fileBytes.Seek(int64(fileBytes.ReadUint32()), 0)
 
 	bodyLength := 320
 	if _config.ErupeConfig.RealClientMode <= _config.S6 {
@@ -244,12 +244,12 @@ func loadQuestFile(s *Session, questId int) []byte {
 	questBody := byteframe.NewByteFrameFromBytes(fileBytes.ReadBytes(uint(bodyLength)))
 	questBody.SetLE()
 	// Find the master quest string pointer
-	questBody.Seek(40, 0)
-	fileBytes.Seek(int64(questBody.ReadUint32()), 0)
-	questBody.Seek(40, 0)
+	_, _ = questBody.Seek(40, 0)
+	_, _ = fileBytes.Seek(int64(questBody.ReadUint32()), 0)
+	_, _ = questBody.Seek(40, 0)
 	// Overwrite it
 	questBody.WriteUint32(uint32(bodyLength))
-	questBody.Seek(0, 2)
+	_, _ = questBody.Seek(0, 2)
 
 	// Rewrite the quest strings and their pointers
 	var tempString []byte
@@ -258,9 +258,9 @@ func loadQuestFile(s *Session, questId int) []byte {
 	for i := 0; i < 8; i++ {
 		questBody.WriteUint32(uint32(tempPointer))
 		temp := int64(fileBytes.Index())
-		fileBytes.Seek(int64(fileBytes.ReadUint32()), 0)
+		_, _ = fileBytes.Seek(int64(fileBytes.ReadUint32()), 0)
 		tempString = fileBytes.ReadNullTerminatedBytes()
-		fileBytes.Seek(temp+4, 0)
+		_, _ = fileBytes.Seek(temp+4, 0)
 		tempPointer += len(tempString) + 1
 		newStrings.WriteNullTerminatedBytes(tempString)
 	}
@@ -278,7 +278,7 @@ func makeEventQuest(s *Session, rows *sql.Rows) ([]byte, error) {
 	var questId, activeDuration, inactiveDuration, flags int
 	var maxPlayers, questType uint8
 	var startTime time.Time
-	rows.Scan(&id, &maxPlayers, &questType, &questId, &mark, &flags, &startTime, &activeDuration, &inactiveDuration)
+	_ = rows.Scan(&id, &maxPlayers, &questType, &questId, &mark, &flags, &startTime, &activeDuration, &inactiveDuration)
 
 	data := loadQuestFile(s, questId)
 	if data == nil {
@@ -388,7 +388,7 @@ func handleMsgMhfEnumerateQuest(s *Session, p mhfpacket.MHFPacket) {
 
 						_, err = tx.Exec("UPDATE event_quests SET start_time = $1 WHERE id = $2", newRotationTime, id)
 						if err != nil {
-							tx.Rollback() // Rollback if an error occurs
+							_ = tx.Rollback()
 							break
 						}
 						startTime = newRotationTime // Set the new start time so the quest can be used/removed immediately.
@@ -421,7 +421,7 @@ func handleMsgMhfEnumerateQuest(s *Session, p mhfpacket.MHFPacket) {
 		}
 
 		rows.Close()
-		tx.Commit()
+		_ = tx.Commit()
 	}
 
 	tuneValues := []tuneValue{

server/channelserver/handlers_register.go

@@ -119,13 +119,13 @@ func (s *Session) notifyRavi() {
 	raviNotif := byteframe.NewByteFrame()
 	temp = &mhfpacket.MsgSysNotifyRegister{RegisterID: 0x40000}
 	raviNotif.WriteUint16(uint16(temp.Opcode()))
-	temp.Build(raviNotif, s.clientContext)
+	_ = temp.Build(raviNotif, s.clientContext)
 	temp = &mhfpacket.MsgSysNotifyRegister{RegisterID: 0x50000}
 	raviNotif.WriteUint16(uint16(temp.Opcode()))
-	temp.Build(raviNotif, s.clientContext)
+	_ = temp.Build(raviNotif, s.clientContext)
 	temp = &mhfpacket.MsgSysNotifyRegister{RegisterID: 0x60000}
 	raviNotif.WriteUint16(uint16(temp.Opcode()))
-	temp.Build(raviNotif, s.clientContext)
+	_ = temp.Build(raviNotif, s.clientContext)
 	raviNotif.WriteUint16(0x0010) // End it.
 	if s.server.erupeConfig.GameplayOptions.LowLatencyRaviente {
 		for session := range sema.clients {

server/channelserver/handlers_register_test.go

@@ -4,7 +4,6 @@ import (
 	"testing"
 
 	"erupe-ce/common/byteframe"
-	"erupe-ce/network/mhfpacket"
 )
 
 // createMockServerWithRaviente creates a mock server with raviente and semaphore
@@ -26,9 +25,6 @@ func TestRavienteInitialization(t *testing.T) {
 		state:    make([]uint32, 30),
 		support:  make([]uint32, 30),
 	}
-	if r == nil {
-		t.Fatal("Raviente is nil")
-	}
 	if len(r.register) != 30 {
 		t.Errorf("register length = %d, want 30", len(r.register))
 	}
@@ -221,9 +217,4 @@ func TestMockServerPacketHandling(t *testing.T) {
 		t.Errorf("ByteFrame length = %d, want 4", len(bf.Data()))
 	}
 
-	// Verify packet types can be instantiated
-	pkt := &mhfpacket.MsgSysAck{}
-	if pkt == nil {
-		t.Error("Failed to create MsgSysAck")
-	}
 }

server/channelserver/handlers_rengoku.go

@@ -158,7 +158,7 @@ func handleMsgMhfEnumerateRengokuRanking(s *Session, p mhfpacket.MHFPacket) {
 	defer rows.Close()
 
 	for rows.Next() {
-		rows.StructScan(&score)
+		_ = rows.StructScan(&score)
 		if score.Name == s.Name {
 			bf.WriteUint32(i)
 			bf.WriteUint32(score.Score)

server/channelserver/handlers_shop_gacha.go

@@ -354,7 +354,7 @@ func getGuaranteedItems(s *Session, gachaID uint32, rollID uint8) []GachaItem {
 	items, err := s.server.db.Queryx(`SELECT item_type, item_id, quantity FROM gacha_items WHERE entry_id = (SELECT id FROM gacha_entries WHERE entry_type = $1 AND gacha_id = $2)`, rollID, gachaID)
 	if err == nil {
 		for items.Next() {
-			items.StructScan(&reward)
+			_ = items.StructScan(&reward)
 			rewards = append(rewards, reward)
 		}
 	}
@@ -586,7 +586,7 @@ func handleMsgMhfGetBoxGachaInfo(s *Session, p mhfpacket.MHFPacket) {
 	var entryIDs []uint32
 	for entries.Next() {
 		var entryID uint32
-		entries.Scan(&entryID)
+		_ = entries.Scan(&entryID)
 		entryIDs = append(entryIDs, entryID)
 	}
 	bf := byteframe.NewByteFrame()

server/channelserver/handlers_tower.go

@@ -324,7 +324,7 @@ func handleMsgMhfGetTenrouirai(s *Session, p mhfpacket.MHFPacket) {
 			defer rows.Close()
 			for rows.Next() {
 				temp := TenrouiraiCharScore{}
-				rows.Scan(&temp.Name, &temp.Score)
+				_ = rows.Scan(&temp.Name, &temp.Score)
 				tenrouirai.CharScore = append(tenrouirai.CharScore, temp)
 			}
 		}

server/channelserver/sys_channel_server.go

@@ -320,7 +320,7 @@ func (s *Server) BroadcastMHF(pkt mhfpacket.MHFPacket, ignoredSession *Session)
 		bf.WriteUint16(uint16(pkt.Opcode()))
 
 		// Build the packet onto the byteframe.
-		pkt.Build(bf, session.clientContext)
+		_ = pkt.Build(bf, session.clientContext)
 
 		// Enqueue in a non-blocking way that drops the packet if the connections send buffer channel is full.
 		session.QueueSendNonBlocking(bf.Data())
@@ -347,7 +347,7 @@ func (s *Server) BroadcastChatMessage(message string) {
 		Message:    message,
 		SenderName: s.name,
 	}
-	msgBinChat.Build(bf)
+	_ = msgBinChat.Build(bf)
 
 	s.BroadcastMHF(&mhfpacket.MsgSysCastedBinary{
 		MessageType:    BinaryMessageTypeChat,
@@ -390,7 +390,7 @@ func (s *Server) BroadcastRaviente(ip uint32, port uint16, stage []byte, _type u
 func (s *Server) DiscordChannelSend(charName string, content string) {
 	if s.erupeConfig.Discord.Enabled && s.discordBot != nil {
 		message := fmt.Sprintf("**%s**: %s", charName, content)
-		s.discordBot.RealtimeChannelSend(message)
+		_ = s.discordBot.RealtimeChannelSend(message)
 	}
 }
 
@@ -398,7 +398,7 @@ func (s *Server) DiscordScreenShotSend(charName string, title string, descriptio
 	if s.erupeConfig.Discord.Enabled && s.discordBot != nil {
 		imageUrl := fmt.Sprintf("%s:%d/api/ss/bbs/%s", s.erupeConfig.Screenshots.Host, s.erupeConfig.Screenshots.Port, articleToken)
 		message := fmt.Sprintf("**%s**: %s - %s %s", charName, title, description, imageUrl)
-		s.discordBot.RealtimeChannelSend(message)
+		_ = s.discordBot.RealtimeChannelSend(message)
 	}
 }
 
@@ -422,7 +422,7 @@ func (s *Server) DisconnectUser(uid uint32) {
 	} else {
 		defer rows.Close()
 		for rows.Next() {
-			rows.Scan(&cid)
+			_ = rows.Scan(&cid)
 			cids = append(cids, cid)
 		}
 	}

server/channelserver/sys_semaphore.go

@@ -51,7 +51,7 @@ func (s *Semaphore) BroadcastMHF(pkt mhfpacket.MHFPacket, ignoredSession *Sessio
 		bf.WriteUint16(uint16(pkt.Opcode()))
 
 		// Build the packet onto the byteframe.
-		pkt.Build(bf, session.clientContext)
+		_ = pkt.Build(bf, session.clientContext)
 
 		// Enqueue in a non-blocking way that drops the packet if the connections send buffer channel is full.
 		session.QueueSendNonBlocking(bf.Data())

server/channelserver/sys_session.go

@@ -131,7 +131,7 @@ func (s *Session) QueueSendMHF(pkt mhfpacket.MHFPacket) {
 	bf.WriteUint16(uint16(pkt.Opcode()))
 
 	// Build the packet onto the byteframe.
-	pkt.Build(bf, s.clientContext)
+	_ = pkt.Build(bf, s.clientContext)
 
 	// Queue it.
 	s.QueueSend(bf.Data())

server/channelserver/testhelpers_db.go

@@ -170,11 +170,11 @@ func applyPatchSchemas(t *testing.T, db *sqlx.DB, projectRoot string) {
 
 		_, err = tx.Exec(string(patchSQL))
 		if err != nil {
-			tx.Rollback()
+			_ = tx.Rollback()
 			t.Logf("Warning: Failed to apply patch %s: %v", filename, err)
 			// Continue with other patches even if one fails
 		} else {
-			tx.Commit()
+			_ = tx.Commit()
 		}
 	}
 }