refactor(channelserver): migrate inline queries to helpers and define named constants

Migrate 6 character data handlers to use the existing loadCharacterData
and saveCharacterData helpers, eliminating duplicate inline SQL:
- LoadFavoriteQuest, SaveFavoriteQuest, LoadDecoMyset, LoadMezfesData,
  LoadHunterNavi, GetEquipSkinHist

Define named constants replacing magic numbers across handlers:
- Achievement trophy tiers, broadcast/message types, diva phase
  durations, RP accrual rates, kill log layout, semaphore bases,
  quest stage/loading screen IDs

Update anti-patterns doc with accurate line counts, evidence-based
softlock analysis, and revised refactoring priorities.

docs/anti-patterns.md

@@ -23,37 +23,90 @@
 
 ## 1. God Files — Massive Handler Files
 
-The channel server has enormous files with thousands of lines, each mixing DB queries, business logic, binary serialization, and response writing with no layering.
+The channel server has large handler files, each mixing DB queries, business logic, binary serialization, and response writing with no layering. Actual line counts (non-test files):
 
-| File | Approx. Lines | Purpose |
+| File | Lines | Purpose |
-|------|---------------|---------|
+|------|-------|---------|
-| `server/channelserver/handlers_guild.go` | ~2000+ | Guild operations |
+| `server/channelserver/handlers_session.go` | 794 | Session setup/teardown |
-| `server/channelserver/handlers_mail.go` | ~1200+ | Mail system |
+| `server/channelserver/handlers_data_paper_tables.go` | 765 | Paper table data |
-| `server/channelserver/handlers_data.go` | ~800+ | Data save/load |
+| `server/channelserver/handlers_quest.go` | 722 | Quest lifecycle |
-| `server/channelserver/handlers_cast_binary.go` | ~500+ | Binary relay |
+| `server/channelserver/handlers_house.go` | 638 | Housing system |
-| `server/channelserver/sys_session.go` | ~500+ | Session lifecycle |
+| `server/channelserver/handlers_festa.go` | 637 | Festival events |
+| `server/channelserver/handlers_data_paper.go` | 621 | Paper/data system |
+| `server/channelserver/handlers_tower.go` | 529 | Tower gameplay |
+| `server/channelserver/handlers_mercenary.go` | 495 | Mercenary system |
+| `server/channelserver/handlers_stage.go` | 492 | Stage/lobby management |
+| `server/channelserver/handlers_guild_info.go` | 473 | Guild info queries |
 
-**Impact:** These files are difficult to navigate, review, and maintain. A change to guild mail logic requires working through a 2000-line file that also handles guild creation, management, and recruitment.
+These sizes (~500-800 lines) are not extreme by Go standards, but the files mix all architectural concerns. The bigger problem is the lack of layering within each file (see [#3](#3-no-architectural-layering--handlers-do-everything)), not the file sizes themselves.
+
+**Impact:** Each handler function is a monolith mixing data access, business logic, and protocol serialization. Testing or reusing any single concern is impossible.
 
 ---
 
-## 2. Silently Swallowed Errors
+## 2. Missing ACK Responses on Error Paths (Client Softlocks)
 
-This is the most pervasive anti-pattern. The dominant error handling pattern across nearly every `handlers_*.go` file is:
+Some handler error paths log the error and return without sending any ACK response to the client. The MHF client uses `MsgSysAck` with an `ErrorCode` field (0 = success, 1 = failure) to complete request/response cycles. When no ACK is sent at all, the client softlocks waiting for a response that never arrives.
+
+### The three error handling patterns in the codebase
+
+**Pattern A — Silent return (the bug):** Error logged, no ACK sent, client hangs.
 
 ```go
-rows, err := s.Server.DB.Query(...)
 if err != nil {
     s.logger.Error("Failed to get ...", zap.Error(err))
-    return  // client gets no response, silently fails
+    return  // BUG: client gets no response, softlocks
 }
 ```
 
-Errors are logged server-side but the client receives no error response. The client is left hanging or receives incomplete data with no indication of failure.
+**Pattern B — Log and continue (acceptable):** Error logged, handler continues and sends a success ACK with default/empty data. The client proceeds with fallback behavior.
 
-**Impact:** Client-side debugging is extremely difficult. Players experience mysterious failures with no feedback. Error recovery is impossible since the client doesn't know something went wrong.
+```go
+if err != nil {
+    s.logger.Error("Failed to load mezfes data", zap.Error(err))
+}
+// Falls through to doAckBufSucceed with empty data
+```
 
-**Recommendation:** Define error response packets or at least send a generic failure response to the client before returning.
+**Pattern C — Fail ACK (correct):** Error logged, explicit fail ACK sent. The client shows an appropriate error dialog and stays connected.
+
+```go
+if err != nil {
+    s.logger.Error("Failed to read rengoku_data.bin", zap.Error(err))
+    doAckBufFail(s, pkt.AckHandle, nil)
+    return
+}
+```
+
+### Evidence that fail ACKs are safe
+
+The codebase already sends ~70 `doAckSimpleFail`/`doAckBufFail` calls in production handler code across 15 files. The client handles them gracefully in all observed cases:
+
+| File | Fail ACKs | Client behavior |
+|------|-----------|-----------------|
+| `handlers_guild_scout.go` | 17 | Guild recruitment error dialogs |
+| `handlers_guild_ops.go` | 10 | Permission denied, guild not found dialogs |
+| `handlers_stage.go` | 8 | "Room is full", "wrong password", "stage locked" |
+| `handlers_house.go` | 6 | Wrong password, invalid box index |
+| `handlers_guild.go` | 9 | Guild icon update errors, unimplemented features |
+| `handlers_guild_alliance.go` | 4 | Alliance permission errors |
+| `handlers_data.go` | 4 | Decompression failures, oversized payloads |
+| `handlers_festa.go` | 4 | Festival entry errors |
+| `handlers_quest.go` | 3 | Missing quest/scenario files |
+
+A comment in `handlers_quest.go:188` explicitly documents the mechanism:
+
+> sends doAckBufFail, which triggers the client's error dialog (snj_questd_matching_fail → SetDialogData) instead of a softlock
+
+The original `mhfo-hd.dll` client reads the `ErrorCode` byte from `MsgSysAck` and dispatches to per-message error UI. A fail ACK causes the client to show an error dialog and remain functional. A missing ACK causes a softlock.
+
+### Scope
+
+A preliminary grep for `logger.Error` followed by bare `return` (no doAck call) found instances across ~25 handler files. The worst offenders are `handlers_festa.go`, `handlers_gacha.go`, `handlers_cafe.go`, and `handlers_house.go`. However, many of these are Pattern B (log-and-continue), not Pattern A. Each instance needs individual review to determine whether an ACK is already sent further down the function.
+
+**Impact:** Players experience softlocks on error paths that could instead show an error dialog and let them continue playing.
+
+**Recommendation:** Audit each silent-return error path. For handlers where the packet has an `AckHandle` and no ACK is sent on the error path, add `doAckSimpleFail`/`doAckBufFail` matching the ACK type used on the success path. This matches the existing pattern used in ~70 other error paths across the codebase.
 
 ---
 
@@ -300,9 +353,9 @@ Database operations use raw `database/sql` with PostgreSQL-specific syntax throu
 
 | Severity | Anti-patterns |
 |----------|--------------|
-| **High** | No architectural layering (#3), silently swallowed errors (#2), god files (#1), tight DB coupling (#13) |
+| **High** | Missing ACK responses / softlocks (#2), no architectural layering (#3), tight DB coupling (#13) |
-| **Medium** | Magic numbers (#4), inconsistent binary I/O (#5), Session god object (#6), copy-paste handlers (#8) |
+| **Medium** | Magic numbers (#4), inconsistent binary I/O (#5), Session god object (#6), copy-paste handlers (#8), raw SQL duplication (#9) |
-| **Low** | `init()` registration (#10), inconsistent logging (#12), mutex granularity (#7), panic-based flow (#11) |
+| **Low** | God files (#1), `init()` registration (#10), inconsistent logging (#12), mutex granularity (#7), panic-based flow (#11) |
 
 ### Root Cause
 
@@ -310,8 +363,9 @@ Most of these anti-patterns stem from a single root cause: **the codebase grew o
 
 ### Recommended Refactoring Priority
 
-1. **Introduce error responses to clients** — highest user-facing impact, can be done incrementally
+1. **Add fail ACKs to silent error paths** — prevents player softlocks, ~70 existing doAckFail calls prove safety, low risk, can be done handler-by-handler
-2. **Extract a repository layer** — decouple SQL from handlers, enable testing
+2. **Extract a character repository layer** — 152 queries across 26 files touch the `characters` table, highest SQL duplication
-3. **Define protocol constants** — replace magic numbers, improve documentation
+3. **Extract load/save helpers** — 38 handlers repeat the same ~10-15 line template, mechanical extraction
-4. **Standardize binary I/O** — pick one approach, migrate the rest
+4. **Extract a guild repository layer** — 32 queries across 8-15 files, second-highest SQL duplication
-5. **Split god files** — break handlers into sub-packages by domain (guild/, mail/, quest/)
+5. **Define protocol constants** — 1,052 hex literals with 174 unique values, improves documentation
+6. **Standardize binary I/O** — pick `byteframe` (already dominant), migrate remaining `binary.Write` and raw slice code

server/channelserver/constants_quest.go

@@ -0,0 +1,62 @@
+package channelserver
+
+// Raviente quest type codes
+const (
+	QuestTypeSpecialTool      = uint8(9)
+	QuestTypeRegularRaviente  = uint8(16)
+	QuestTypeViolentRaviente  = uint8(22)
+	QuestTypeBerserkRaviente  = uint8(40)
+	QuestTypeExtremeRaviente  = uint8(50)
+	QuestTypeSmallBerserkRavi = uint8(51)
+)
+
+// Event quest binary frame offsets
+const (
+	questFrameTimeFlagOffset  = 25
+	questFrameVariant3Offset  = 175
+)
+
+// Quest body lengths per game version
+const (
+	questBodyLenS6   = 160
+	questBodyLenF5   = 168
+	questBodyLenG101 = 192
+	questBodyLenZ1   = 224
+	questBodyLenZZ   = 320
+)
+
+// BackportQuest constants
+const (
+	questRewardTableBase    = uint32(96)
+	questStringPointerOff   = 40
+	questStringTablePadding = 32
+	questStringCount        = 8
+)
+
+// BackportQuest fill lengths per version
+const (
+	questBackportFillS6   = uint32(44)
+	questBackportFillF5   = uint32(52)
+	questBackportFillG101 = uint32(76)
+	questBackportFillZZ   = uint32(108)
+)
+
+// Tune value count limits per game version
+const (
+	tuneLimitG1   = 256
+	tuneLimitG3   = 283
+	tuneLimitGG   = 315
+	tuneLimitG61  = 332
+	tuneLimitG7   = 339
+	tuneLimitG81  = 396
+	tuneLimitG91  = 694
+	tuneLimitG101 = 704
+	tuneLimitZ2   = 750
+	tuneLimitZZ   = 770
+)
+
+// Event quest data size bounds
+const (
+	questDataMaxLen = 896
+	questDataMinLen = 352
+)

server/channelserver/handlers_achievement.go

@@ -9,6 +9,13 @@ import (
 	"go.uber.org/zap"
 )
 
+// Achievement trophy tier thresholds (bitfield values)
+const (
+	AchievementTrophyBronze = uint8(0x40)
+	AchievementTrophySilver = uint8(0x60)
+	AchievementTrophyGold   = uint8(0x7F)
+)
+
 var achievementCurves = [][]int32{
 	// 0: HR weapon use, Class use, Tore dailies
 	{5, 15, 30, 50, 100, 150, 200, 300},
@@ -61,10 +68,10 @@ func GetAchData(id uint8, score int32) Achievement {
 				ach.NextValue = 15
 			case 6:
 				ach.NextValue = 15
-				ach.Trophy = 0x40
+				ach.Trophy = AchievementTrophyBronze
 			case 7:
 				ach.NextValue = 20
-				ach.Trophy = 0x60
+				ach.Trophy = AchievementTrophySilver
 			}
 			return ach
 		} else {
@@ -83,7 +90,7 @@ func GetAchData(id uint8, score int32) Achievement {
 		}
 	}
 	ach.Required = uint32(curve[7])
-	ach.Trophy = 0x7F
+	ach.Trophy = AchievementTrophyGold
 	ach.Progress = ach.Required
 	return ach
 }

server/channelserver/handlers_cast_binary.go

@@ -34,7 +34,7 @@ func handleMsgSysCastBinary(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgSysCastBinary)
 	tmp := byteframe.NewByteFrameFromBytes(pkt.RawDataPayload)
 
-	if pkt.BroadcastType == 0x03 && pkt.MessageType == 0x03 && len(pkt.RawDataPayload) == 0x10 {
+	if pkt.BroadcastType == BroadcastTypeStage && pkt.MessageType == BinaryMessageTypeData && len(pkt.RawDataPayload) == 0x10 {
 		if tmp.ReadUint16() == 0x0002 && tmp.ReadUint8() == 0x18 {
 			var timer bool
 			if err := s.server.db.QueryRow(`SELECT COALESCE(timer, false) FROM users u WHERE u.id=(SELECT c.user_id FROM characters c WHERE c.id=$1)`, s.charID).Scan(&timer); err != nil {
@@ -50,7 +50,7 @@ func handleMsgSysCastBinary(s *Session, p mhfpacket.MHFPacket) {
 	}
 
 	if s.server.erupeConfig.DebugOptions.QuestTools {
-		if pkt.BroadcastType == 0x03 && pkt.MessageType == 0x02 && len(pkt.RawDataPayload) > 32 {
+		if pkt.BroadcastType == BroadcastTypeStage && pkt.MessageType == BinaryMessageTypeQuest && len(pkt.RawDataPayload) > 32 {
 			// This is only correct most of the time
 			tmp.ReadBytes(20)
 			tmp.SetLE()
@@ -131,7 +131,7 @@ func handleMsgSysCastBinary(s *Session, p mhfpacket.MHFPacket) {
 			s.stage.BroadcastMHF(resp, s)
 		}
 	case BroadcastTypeServer:
-		if pkt.MessageType == 1 {
+		if pkt.MessageType == BinaryMessageTypeChat {
 			raviSema := s.server.getRaviSemaphore()
 			if raviSema != nil {
 				raviSema.BroadcastMHF(resp, s)

server/channelserver/handlers_diva.go

@@ -11,6 +11,14 @@ import (
 	"go.uber.org/zap"
 )
 
+// Diva Defense event duration constants (all values in seconds)
+const (
+	divaPhaseDuration = 601200  // 6d 23h = first song phase
+	divaInterlude     = 3900    // 65 min = gap between phases
+	divaWeekDuration  = 604800  // 7 days = subsequent phase length
+	divaTotalLifespan = 2977200 // ~34.5 days = full event window
+)
+
 func cleanupDiva(s *Session) {
 	if _, err := s.server.db.Exec("DELETE FROM events WHERE event_type='diva'"); err != nil {
 		s.logger.Error("Failed to delete diva events", zap.Error(err))
@@ -25,29 +33,29 @@ func generateDivaTimestamps(s *Session, start uint32, debug bool) []uint32 {
 		switch start {
 		case 1:
 			timestamps[0] = midnight
-			timestamps[1] = timestamps[0] + 601200
+			timestamps[1] = timestamps[0] + divaPhaseDuration
-			timestamps[2] = timestamps[1] + 3900
+			timestamps[2] = timestamps[1] + divaInterlude
-			timestamps[3] = timestamps[1] + 604800
+			timestamps[3] = timestamps[1] + divaWeekDuration
-			timestamps[4] = timestamps[3] + 3900
+			timestamps[4] = timestamps[3] + divaInterlude
-			timestamps[5] = timestamps[3] + 604800
+			timestamps[5] = timestamps[3] + divaWeekDuration
 		case 2:
-			timestamps[0] = midnight - 605100
+			timestamps[0] = midnight - (divaPhaseDuration + divaInterlude)
-			timestamps[1] = midnight - 3900
+			timestamps[1] = midnight - divaInterlude
 			timestamps[2] = midnight
-			timestamps[3] = timestamps[1] + 604800
+			timestamps[3] = timestamps[1] + divaWeekDuration
-			timestamps[4] = timestamps[3] + 3900
+			timestamps[4] = timestamps[3] + divaInterlude
-			timestamps[5] = timestamps[3] + 604800
+			timestamps[5] = timestamps[3] + divaWeekDuration
 		case 3:
-			timestamps[0] = midnight - 1213800
+			timestamps[0] = midnight - (divaPhaseDuration + divaInterlude + divaWeekDuration + divaInterlude)
-			timestamps[1] = midnight - 608700
+			timestamps[1] = midnight - (divaWeekDuration + divaInterlude)
-			timestamps[2] = midnight - 604800
+			timestamps[2] = midnight - divaWeekDuration
-			timestamps[3] = midnight - 3900
+			timestamps[3] = midnight - divaInterlude
 			timestamps[4] = midnight
-			timestamps[5] = timestamps[3] + 604800
+			timestamps[5] = timestamps[3] + divaWeekDuration
 		}
 		return timestamps
 	}
-	if start == 0 || TimeAdjusted().Unix() > int64(start)+2977200 {
+	if start == 0 || TimeAdjusted().Unix() > int64(start)+divaTotalLifespan {
 		cleanupDiva(s)
 		// Generate a new diva defense, starting midnight tomorrow
 		start = uint32(midnight.Add(24 * time.Hour).Unix())
@@ -56,11 +64,11 @@ func generateDivaTimestamps(s *Session, start uint32, debug bool) []uint32 {
 		}
 	}
 	timestamps[0] = start
-	timestamps[1] = timestamps[0] + 601200
+	timestamps[1] = timestamps[0] + divaPhaseDuration
-	timestamps[2] = timestamps[1] + 3900
+	timestamps[2] = timestamps[1] + divaInterlude
-	timestamps[3] = timestamps[1] + 604800
+	timestamps[3] = timestamps[1] + divaWeekDuration
-	timestamps[4] = timestamps[3] + 3900
+	timestamps[4] = timestamps[3] + divaInterlude
-	timestamps[5] = timestamps[3] + 604800
+	timestamps[5] = timestamps[3] + divaWeekDuration
 	return timestamps
 }
 

server/channelserver/handlers_festa.go

@@ -22,21 +22,8 @@ func handleMsgMhfSaveMezfesData(s *Session, p mhfpacket.MHFPacket) {
 
 func handleMsgMhfLoadMezfesData(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfLoadMezfesData)
-	var data []byte
+	loadCharacterData(s, pkt.AckHandle, "mezfes",
-	if err := s.server.db.QueryRow(`SELECT mezfes FROM characters WHERE id=$1`, s.charID).Scan(&data); err != nil && !errors.Is(err, sql.ErrNoRows) {
+		[]byte{0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
-		s.logger.Error("Failed to load mezfes data", zap.Error(err))
-	}
-	bf := byteframe.NewByteFrame()
-	if len(data) > 0 {
-		bf.WriteBytes(data)
-	} else {
-		bf.WriteUint32(0)
-		bf.WriteUint8(2)
-		bf.WriteUint32(0)
-		bf.WriteUint32(0)
-		bf.WriteUint32(0)
-	}
-	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfEnumerateRanking(s *Session, p mhfpacket.MHFPacket) {

server/channelserver/handlers_house.go

@@ -271,18 +271,11 @@ func handleMsgMhfUpdateMyhouseInfo(s *Session, p mhfpacket.MHFPacket) {
 
 func handleMsgMhfLoadDecoMyset(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfLoadDecoMyset)
-	var data []byte
+	defaultData := []byte{0x01, 0x00}
-	err := s.server.db.QueryRow("SELECT decomyset FROM characters WHERE id = $1", s.charID).Scan(&data)
+	if s.server.erupeConfig.RealClientMode < _config.G10 {
-	if err != nil {
+		defaultData = []byte{0x00, 0x00}
-		s.logger.Error("Failed to load decomyset", zap.Error(err))
 	}
-	if len(data) == 0 {
+	loadCharacterData(s, pkt.AckHandle, "decomyset", defaultData)
-		data = []byte{0x01, 0x00}
-		if s.server.erupeConfig.RealClientMode < _config.G10 {
-			data = []byte{0x00, 0x00}
-		}
-	}
-	doAckBufSucceed(s, pkt.AckHandle, data)
 }
 
 func handleMsgMhfSaveDecoMyset(s *Session, p mhfpacket.MHFPacket) {

server/channelserver/handlers_mercenary.go

@@ -47,13 +47,7 @@ func handleMsgMhfLoadHunterNavi(s *Session, p mhfpacket.MHFPacket) {
 	if s.server.erupeConfig.RealClientMode <= _config.G7 {
 		naviLength = 280
 	}
-	var data []byte
+	loadCharacterData(s, pkt.AckHandle, "hunternavi", make([]byte, naviLength))
-	err := s.server.db.QueryRow("SELECT hunternavi FROM characters WHERE id = $1", s.charID).Scan(&data)
-	if len(data) == 0 {
-		s.logger.Error("Failed to load hunternavi", zap.Error(err))
-		data = make([]byte, naviLength)
-	}
-	doAckBufSucceed(s, pkt.AckHandle, data)
 }
 
 func handleMsgMhfSaveHunterNavi(s *Session, p mhfpacket.MHFPacket) {

server/channelserver/handlers_misc.go

@@ -170,13 +170,7 @@ func equipSkinHistSize(mode _config.Mode) int {
 func handleMsgMhfGetEquipSkinHist(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetEquipSkinHist)
 	size := equipSkinHistSize(s.server.erupeConfig.RealClientMode)
-	var data []byte
+	loadCharacterData(s, pkt.AckHandle, "skin_hist", make([]byte, size))
-	err := s.server.db.QueryRow("SELECT COALESCE(skin_hist::bytea, $2::bytea) FROM characters WHERE id = $1", s.charID, make([]byte, size)).Scan(&data)
-	if err != nil {
-		s.logger.Error("Failed to load skin_hist", zap.Error(err))
-		data = make([]byte, size)
-	}
-	doAckBufSucceed(s, pkt.AckHandle, data)
 }
 
 func handleMsgMhfUpdateEquipSkinHist(s *Session, p mhfpacket.MHFPacket) {

server/channelserver/handlers_quest.go

@@ -50,7 +50,7 @@ func equal(a, b []byte) bool {
 
 // BackportQuest converts a quest binary to an older format.
 func BackportQuest(data []byte, mode _config.Mode) []byte {
-	wp := binary.LittleEndian.Uint32(data[0:4]) + 96
+	wp := binary.LittleEndian.Uint32(data[0:4]) + questRewardTableBase
 	rp := wp + 4
 	for i := uint32(0); i < 6; i++ {
 		if i != 0 {
@@ -60,13 +60,13 @@ func BackportQuest(data []byte, mode _config.Mode) []byte {
 		copy(data[wp:wp+4], data[rp:rp+4])
 	}
 
-	fillLength := uint32(108)
+	fillLength := questBackportFillZZ
 	if mode <= _config.S6 {
-		fillLength = 44
+		fillLength = questBackportFillS6
 	} else if mode <= _config.F5 {
-		fillLength = 52
+		fillLength = questBackportFillF5
 	} else if mode <= _config.G101 {
-		fillLength = 76
+		fillLength = questBackportFillG101
 	}
 
 	copy(data[wp:wp+fillLength], data[rp:rp+fillLength])
@@ -195,27 +195,13 @@ func seasonConversion(s *Session, questFile string) string {
 
 func handleMsgMhfLoadFavoriteQuest(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfLoadFavoriteQuest)
-	var data []byte
+	loadCharacterData(s, pkt.AckHandle, "savefavoritequest",
-	err := s.server.db.QueryRow("SELECT savefavoritequest FROM characters WHERE id = $1", s.charID).Scan(&data)
+		[]byte{0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
-	if err == nil && len(data) > 0 {
-		doAckBufSucceed(s, pkt.AckHandle, data)
-	} else {
-		doAckBufSucceed(s, pkt.AckHandle, []byte{0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
-	}
 }
 
 func handleMsgMhfSaveFavoriteQuest(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfSaveFavoriteQuest)
-	if len(pkt.Data) > 65536 {
+	saveCharacterData(s, pkt.AckHandle, "savefavoritequest", pkt.Data, 65536)
-		s.logger.Warn("FavoriteQuest payload too large", zap.Int("len", len(pkt.Data)))
-		doAckSimpleSucceed(s, pkt.AckHandle, make([]byte, 4))
-		return
-	}
-	dumpSaveData(s, pkt.Data, "favquest")
-	if _, err := s.server.db.Exec("UPDATE characters SET savefavoritequest=$1 WHERE id=$2", pkt.Data, s.charID); err != nil {
-		s.logger.Error("Failed to save favorite quest", zap.Error(err))
-	}
-	doAckSimpleSucceed(s, pkt.AckHandle, []byte{0x00, 0x00, 0x00, 0x00})
 }
 
 func loadQuestFile(s *Session, questId int) []byte {

server/channelserver/handlers_session.go

@@ -237,14 +237,14 @@ func logoutPlayer(s *Session) {
 		timePlayed += sessionTime
 
 		if mhfcourse.CourseExists(30, s.courses) {
-			rpGained = timePlayed / 900
+			rpGained = timePlayed / rpAccrualCafe
-			timePlayed = timePlayed % 900
+			timePlayed = timePlayed % rpAccrualCafe
 			if _, err := s.server.db.Exec("UPDATE characters SET cafe_time=cafe_time+$1 WHERE id=$2", sessionTime, s.charID); err != nil {
 				s.logger.Error("Failed to update cafe time", zap.Error(err))
 			}
 		} else {
-			rpGained = timePlayed / 1800
+			rpGained = timePlayed / rpAccrualNormal
-			timePlayed = timePlayed % 1800
+			timePlayed = timePlayed % rpAccrualNormal
 		}
 
 		s.logger.Debug("Session metrics calculated",
@@ -386,13 +386,25 @@ func handleMsgSysIssueLogkey(s *Session, p mhfpacket.MHFPacket) {
 	doAckBufSucceed(s, pkt.AckHandle, resp.Data())
 }
 
+// Kill log binary layout constants
+const (
+	killLogHeaderSize   = 32  // bytes before monster kill count array
+	killLogMonsterCount = 176 // monster table entries
+)
+
+// RP accrual rate constants (seconds per RP point)
+const (
+	rpAccrualNormal = 1800 // 30 min per RP without cafe
+	rpAccrualCafe   = 900  // 15 min per RP with cafe course
+)
+
 func handleMsgSysRecordLog(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgSysRecordLog)
 	if s.server.erupeConfig.RealClientMode == _config.ZZ {
 		bf := byteframe.NewByteFrameFromBytes(pkt.Data)
-		_, _ = bf.Seek(32, 0)
+		_, _ = bf.Seek(killLogHeaderSize, 0)
 		var val uint8
-		for i := 0; i < 176; i++ {
+		for i := 0; i < killLogMonsterCount; i++ {
 			val = bf.ReadUint8()
 			if val > 0 && mhfmon.Monsters[i].Large {
 				if _, err := s.server.db.Exec(`INSERT INTO kill_logs (character_id, monster, quantity, timestamp) VALUES ($1, $2, $3, $4)`, s.charID, i, val, TimeAdjusted()); err != nil {

server/channelserver/sys_session.go

@@ -327,12 +327,18 @@ func (s *Session) getObjectId() uint32 {
 	return uint32(s.objectID)<<16 | uint32(s.objectIndex)
 }
 
+// Semaphore ID base values
+const (
+	semaphoreBaseDefault = uint32(0x000F0000)
+	semaphoreBaseAlt     = uint32(0x000E0000)
+)
+
 // GetSemaphoreID returns the semaphore ID held by the session, varying by semaphore mode.
 func (s *Session) GetSemaphoreID() uint32 {
 	if s.semaphoreMode {
-		return 0x000E0000 + uint32(s.semaphoreID[1])
+		return semaphoreBaseAlt + uint32(s.semaphoreID[1])
 	} else {
-		return 0x000F0000 + uint32(s.semaphoreID[0])
+		return semaphoreBaseDefault + uint32(s.semaphoreID[0])
 	}
 }