diff --git a/internal/topdata/FEAT_GENERATED_FAMILIES_CONTRACT.md b/internal/topdata/FEAT_GENERATED_FAMILIES_CONTRACT.md
index 73082bb..3d6a303 100644
--- a/internal/topdata/FEAT_GENERATED_FAMILIES_CONTRACT.md
+++ b/internal/topdata/FEAT_GENERATED_FAMILIES_CONTRACT.md
@@ -53,7 +53,6 @@ Compact family-expansion shape:
   },
   "apply_after_modules": true,
   "child_ref_field": "REQSKILL",
-  "allow_existing_only": true,
   "child_source": {
     "dataset": "skills",
     "predicate": "accessible"
@@ -116,6 +115,8 @@ Rules:
 - family-expansion files must declare `template`, `family_key`, and `child_source.dataset`
 - `child_source.column` is used when expansion is gated by a non-null source field
 - `child_source.predicate: "accessible"` currently means `HideFromLevelUp != 1`
+- skill focus families intentionally do not set `allow_existing_only`, so any new
+  accessible skill automatically receives matching focus rows
 - compact `overrides` are keyed by source dataset key:
   - `skills:*` for skill families
   - `baseitems:*` for weapon families
diff --git a/internal/topdata/expansion_native.go b/internal/topdata/expansion_native.go
index e73eb8d..a5aaaad 100644
--- a/internal/topdata/expansion_native.go
+++ b/internal/topdata/expansion_native.go
@@ -40,12 +40,6 @@ func parseRowMetadata(raw any) (map[string]any, error) {
 			if len(wiki) > 0 {
 				meta["wiki"] = wiki
 			}
-		case "portrait":
-			portrait, err := parsePortraitMetadata(value)
-			if err != nil {
-				return nil, fmt.Errorf("meta.portrait: %w", err)
-			}
-			meta["portrait"] = portrait
 		default:
 			return nil, fmt.Errorf("unknown metadata key %q", key)
 		}
@@ -53,32 +47,6 @@ func parseRowMetadata(raw any) (map[string]any, error) {
 	return meta, nil
 }
 
-func parsePortraitMetadata(raw any) (map[string]any, error) {
-	obj, ok := raw.(map[string]any)
-	if !ok {
-		return nil, fmt.Errorf("must be an object")
-	}
-	portrait := map[string]any{}
-	for key, value := range obj {
-		switch normalizeMetadataKey(key) {
-		case "resref":
-			text, ok := value.(string)
-			if !ok || strings.TrimSpace(text) == "" {
-				return nil, fmt.Errorf("resref must be a non-empty string")
-			}
-			portrait["resref"] = text
-		case "sex", "race", "inanimate_type", "plot", "low_gore":
-			portrait[normalizeMetadataKey(key)] = value
-		default:
-			return nil, fmt.Errorf("unknown field %q", key)
-		}
-	}
-	if _, ok := portrait["resref"]; !ok {
-		return nil, fmt.Errorf("resref is required")
-	}
-	return portrait, nil
-}
-
 func mergeExpansionData(collected []nativeCollectedDataset) ([]nativeCollectedDataset, error) {
 	datasetIndexMap := make(map[string]int)
 	for i, ds := range collected {
@@ -106,6 +74,7 @@ func mergeExpansionData(collected []nativeCollectedDataset) ([]nativeCollectedDa
 		return collected, nil
 	}
 
+	modifiedTargets := map[int]struct{}{}
 	for _, src := range rowsWithExpansion {
 		expansion, _ := extractExpansionData(src.row)
 		for targetDatasetName, targetRows := range expansion.Data {
@@ -158,10 +127,8 @@ func mergeExpansionData(collected []nativeCollectedDataset) ([]nativeCollectedDa
 				}
 
 				key, _ := targetRow["key"].(string)
-				if key == "" && targetDatasetName == "portraits" {
-					if baseResRef, ok := targetRow["BaseResRef"].(string); ok {
-						key = "portraits:" + baseResRef
-					}
+				if strings.TrimSpace(key) == "" {
+					return nil, fmt.Errorf("expansion into %s: injected rows must specify key", targetDatasetName)
 				}
 
 				if key != "" {
@@ -190,6 +157,7 @@ func mergeExpansionData(collected []nativeCollectedDataset) ([]nativeCollectedDa
 					if _, exists := targetDS.LockData[key]; !exists {
 						targetDS.LockData[key] = rowID
 						lockModified = true
+						targetDS.LockAdded++
 					}
 				}
 
@@ -207,10 +175,8 @@ func mergeExpansionData(collected []nativeCollectedDataset) ([]nativeCollectedDa
 				targetDS.Rows = append(targetDS.Rows, newRow)
 			}
 
-			if lockModified && targetDS.Dataset.LockPath != "" {
-				if err := saveLockfile(targetDS.Dataset.LockPath, targetDS.LockData); err != nil {
-					return nil, fmt.Errorf("dataset %s: %w", targetDS.Dataset.Name, err)
-				}
+			if lockModified {
+				modifiedTargets[targetIndex] = struct{}{}
 			}
 
 			slices.SortFunc(targetDS.Rows, func(a, b map[string]any) int {
@@ -224,6 +190,23 @@ func mergeExpansionData(collected []nativeCollectedDataset) ([]nativeCollectedDa
 		}
 	}
 
+	for targetIndex := range modifiedTargets {
+		targetDS := collected[targetIndex]
+		referencedKeys, err := collectReferencedLockKeys(nativeDatasetSourceDir(targetDS.Dataset))
+		if err != nil {
+			return nil, fmt.Errorf("dataset %s: collect referenced keys: %w", targetDS.Dataset.Name, err)
+		}
+		if pruned, updated := pruneLockDataToActiveRows(targetDS.LockData, targetDS.Rows, referencedKeys); pruned > 0 || updated > 0 {
+			targetDS.LockPruned += pruned
+			collected[targetIndex] = targetDS
+		}
+		if targetDS.Dataset.LockPath != "" {
+			if err := saveLockfile(targetDS.Dataset.LockPath, targetDS.LockData); err != nil {
+				return nil, fmt.Errorf("dataset %s: %w", targetDS.Dataset.Name, err)
+			}
+		}
+	}
+
 	return collected, nil
 }
 
diff --git a/internal/topdata/native.go b/internal/topdata/native.go
index a8092b1..0890f91 100644
--- a/internal/topdata/native.go
+++ b/internal/topdata/native.go
@@ -39,11 +39,13 @@ const (
 )
 
 type nativeCollectedDataset struct {
-	Dataset  nativeDataset
-	Columns  []string
-	Rows     []map[string]any
-	LockData map[string]int
-	TableKey string
+	Dataset    nativeDataset
+	Columns    []string
+	Rows       []map[string]any
+	LockData   map[string]int
+	TableKey   string
+	LockAdded  int
+	LockPruned int
 }
 
 type resolvedTable struct {
@@ -236,7 +238,6 @@ func buildNativeUnchecked(p *project.Project, progress func(string), prebuiltWik
 			}
 		}
 	}
-
 	if hasCollectedPartsDatasets(collected) {
 		progress("Resolving released parts manifest...")
 		autogenerated, err := resolveAutogeneratedPartsInventory(p, progress)
@@ -261,6 +262,10 @@ func buildNativeUnchecked(p *project.Project, progress func(string), prebuiltWik
 	if err != nil {
 		return BuildResult{}, err
 	}
+	lockAdded, lockPruned := nativeLockChangeStats(collected)
+	if lockAdded > 0 || lockPruned > 0 {
+		progress(fmt.Sprintf("Updated native lockfiles (%d new IDs, %d stale IDs pruned)", lockAdded, lockPruned))
+	}
 	globalKeyToID = map[string]int{}
 	globalRowByKey = map[string]map[string]any{}
 	for _, collectedDataset := range collected {
@@ -365,6 +370,16 @@ func nativeCompileGroup(datasetName string) string {
 	}
 }
 
+func nativeLockChangeStats(collected []nativeCollectedDataset) (int, int) {
+	added := 0
+	pruned := 0
+	for _, dataset := range collected {
+		added += dataset.LockAdded
+		pruned += dataset.LockPruned
+	}
+	return added, pruned
+}
+
 type nativeCompileGroupStat struct {
 	OutputTables    int
 	SourceFragments int
@@ -577,17 +592,28 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 	if !ok {
 		return nativeCollectedDataset{}, fmt.Errorf("dataset %s: rows must be an array", dataset.Name)
 	}
+	baseBoundaryID := -1
 	baseRowKeys := map[string]struct{}{}
-	for _, raw := range rawBaseRows {
+	baseRowKeyCounts := map[string]int{}
+	for index, raw := range rawBaseRows {
 		rowObj, ok := raw.(map[string]any)
 		if !ok {
 			continue
 		}
+		rowID := index
+		if rawID, ok := rowObj["id"]; ok {
+			parsed, err := asInt(rawID)
+			if err == nil {
+				rowID = parsed
+			}
+		}
+		baseBoundaryID = rowID
 		key, ok := rowObj["key"].(string)
 		if !ok || key == "" {
 			continue
 		}
 		baseRowKeys[key] = struct{}{}
+		baseRowKeyCounts[key]++
 	}
 
 	lockData, err := loadLockfile(dataset.LockPath)
@@ -595,12 +621,38 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 		return nativeCollectedDataset{}, fmt.Errorf("dataset %s: %w", dataset.Name, err)
 	}
 
+	explicitModuleIDs := map[string]int{}
+	for _, module := range moduleData {
+		explicitIDs, err := collectExplicitModuleIDs(dataset.Name, module.Name, module.Data)
+		if err != nil {
+			return nativeCollectedDataset{}, err
+		}
+		for key, rowID := range explicitIDs {
+			explicitModuleIDs[key] = rowID
+		}
+	}
+
 	rows := make([]map[string]any, 0, len(rawBaseRows))
 	rowByID := map[int]map[string]any{}
 	rowByKey := map[string]map[string]any{}
 	usedIDs := map[int]struct{}{}
 	lockModified := false
+	lockAdded := 0
+	lockPruned := 0
 
+	for key, rowID := range lockData {
+		if rowID <= baseBoundaryID {
+			if _, ok := baseRowKeys[key]; ok {
+				continue
+			}
+			if explicitID, ok := explicitModuleIDs[key]; ok && explicitID == rowID {
+				continue
+			}
+			delete(lockData, key)
+			lockModified = true
+			lockPruned++
+		}
+	}
 	for _, rowID := range lockData {
 		usedIDs[rowID] = struct{}{}
 	}
@@ -615,18 +667,87 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 		}
 		rows = append(rows, row)
 		rowID := row["id"].(int)
+		if key, ok := row["key"].(string); ok && key != "" {
+			if baseRowKeyCounts[key] > 1 {
+				if lockedID, ok := lockData[key]; !ok || lockedID != rowID {
+					lockData[key] = rowID
+					lockModified = true
+				}
+			} else if lockedID, ok := lockData[key]; ok {
+				row["id"] = lockedID
+				rowID = lockedID
+			} else {
+				lockData[key] = rowID
+				lockModified = true
+				lockAdded++
+			}
+		}
 		rowByID[rowID] = row
 		if key, ok := row["key"].(string); ok && key != "" {
 			rowByKey[key] = row
-			if lockData[key] != rowID {
-				lockData[key] = rowID
-				lockModified = true
-			}
 		}
 		usedIDs[rowID] = struct{}{}
 	}
+	for rowID := 0; rowID <= baseBoundaryID; rowID++ {
+		usedIDs[rowID] = struct{}{}
+	}
+	for _, rowID := range explicitModuleIDs {
+		usedIDs[rowID] = struct{}{}
+	}
 
 	nextID := nextAvailableID(usedIDs)
+	allocateNextID := func() int {
+		rowID := nextID
+		usedIDs[rowID] = struct{}{}
+		nextID = nextAvailableID(usedIDs)
+		return rowID
+	}
+	lockedIDForKey := func(key string) (int, bool) {
+		lockedID, ok := lockData[key]
+		if !ok {
+			return 0, false
+		}
+		return lockedID, true
+	}
+	stripMismatchedLockedOverrideID := func(override map[string]any) (map[string]any, error) {
+		rawKey, hasKey := override["key"].(string)
+		if !hasKey || rawKey == "" {
+			return override, nil
+		}
+		lockedID, hasLockedID := lockData[rawKey]
+		if !hasLockedID {
+			return override, nil
+		}
+		rawID, hasID := override["id"]
+		if !hasID {
+			return override, nil
+		}
+		parsedID, err := asInt(rawID)
+		if err != nil {
+			return nil, fmt.Errorf("dataset %s: override id %v is not numeric", dataset.Name, rawID)
+		}
+		if parsedID == lockedID {
+			return override, nil
+		}
+		cloned := make(map[string]any, len(override)-1)
+		for field, value := range override {
+			if field != "id" {
+				cloned[field] = value
+			}
+		}
+		return cloned, nil
+	}
+	validExplicitIDForNewKey := func(key string, rowID int) bool {
+		if key == "" {
+			return true
+		}
+		for lockedKey, lockedID := range lockData {
+			if lockedKey != key && lockedID == rowID {
+				return false
+			}
+		}
+		return true
+	}
 	applyModuleData := func(sourceLabel string, moduleData map[string]any) error {
 		if rawEntries, ok := moduleData["entries"]; ok {
 			entries, ok := rawEntries.(map[string]any)
@@ -674,7 +795,10 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 					if err != nil {
 						return err
 					}
-					keyChanged := updateOverrideRowKey(existing, expanded, rowByKey, lockData)
+					keyChanged, err := updateOverrideRowKey(dataset.Name, existing, expanded, rowByKey, lockData)
+					if err != nil {
+						return err
+					}
 					if keyChanged {
 						lockModified = true
 					}
@@ -686,13 +810,12 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 					}
 					continue
 				}
-				rowID, ok := lockData[key]
+				rowID, ok := lockedIDForKey(key)
 				if !ok {
-					rowID = nextID
+					rowID = allocateNextID()
 					lockData[key] = rowID
 					lockModified = true
-					usedIDs[rowID] = struct{}{}
-					nextID = nextAvailableID(usedIDs)
+					lockAdded++
 				}
 				row, err := canonicalizeEntry(dataset, columns, rowID, key, rawEntry)
 				if err != nil {
@@ -714,6 +837,10 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 				if !ok {
 					return fmt.Errorf("dataset %s: override %d in %s must be an object", dataset.Name, index, sourceLabel)
 				}
+				override, err = stripMismatchedLockedOverrideID(override)
+				if err != nil {
+					return err
+				}
 				row, err := resolveOverrideTarget(dataset.Name, override, rowByID, rowByKey)
 				if err != nil {
 					rawKey, hasKey := override["key"].(string)
@@ -724,21 +851,28 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 						if parseErr != nil {
 							return fmt.Errorf("dataset %s: override id %v is not numeric", dataset.Name, rawID)
 						}
-						rowID = parsedID
-						hasRowID = true
+						rawKey, _ := override["key"].(string)
+						_, lockedIDExists := lockData[rawKey]
+						if !lockedIDExists {
+							if !validExplicitIDForNewKey(rawKey, parsedID) {
+								return fmt.Errorf("dataset %s: override key %q id %d collides with an existing lockfile id", dataset.Name, rawKey, parsedID)
+							}
+							rowID = parsedID
+							hasRowID = true
+						}
 					}
 					if hasKey && rawKey != "" {
-						if lockedID, hasLockedID := lockData[rawKey]; hasLockedID {
+						if lockedID, hasLockedID := lockedIDForKey(rawKey); hasLockedID {
 							rowID = lockedID
 							hasRowID = true
 						} else {
 							if !hasRowID {
-								rowID = nextID
+								rowID = allocateNextID()
 								hasRowID = true
-								nextID = nextAvailableID(usedIDs)
 							}
 							lockData[rawKey] = rowID
 							lockModified = true
+							lockAdded++
 						}
 					}
 					if !hasRowID {
@@ -796,7 +930,10 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 				if err != nil {
 					return err
 				}
-				keyChanged := updateOverrideRowKey(row, expanded, rowByKey, lockData)
+				keyChanged, err := updateOverrideRowKey(dataset.Name, row, expanded, rowByKey, lockData)
+				if err != nil {
+					return err
+				}
 				if keyChanged {
 					lockModified = true
 				}
@@ -847,6 +984,14 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 	if dataset.Name == "spells" {
 		normalizeCollectedSpellImpactScripts(rows, baseRowKeys)
 	}
+	referencedKeys, err := collectReferencedLockKeys(nativeDatasetSourceDir(dataset))
+	if err != nil {
+		return nativeCollectedDataset{}, fmt.Errorf("dataset %s: collect referenced keys: %w", dataset.Name, err)
+	}
+	if pruned, updated := pruneLockDataToActiveRows(lockData, rows, referencedKeys); pruned > 0 || updated > 0 {
+		lockModified = true
+		lockPruned += pruned
+	}
 
 	if lockModified {
 		if err := saveLockfile(dataset.LockPath, lockData); err != nil {
@@ -859,13 +1004,113 @@ func collectBaseDataset(dataset nativeDataset) (nativeCollectedDataset, error) {
 		return a["id"].(int) - b["id"].(int)
 	})
 	return nativeCollectedDataset{
-		Dataset:  dataset,
-		Columns:  columns,
-		Rows:     rows,
-		LockData: lockData,
+		Dataset:    dataset,
+		Columns:    columns,
+		Rows:       rows,
+		LockData:   lockData,
+		LockAdded:  lockAdded,
+		LockPruned: lockPruned,
 	}, nil
 }
 
+func pruneLockDataToActiveRows(lockData map[string]int, rows []map[string]any, referencedKeys map[string]struct{}) (int, int) {
+	if len(lockData) == 0 {
+		return 0, 0
+	}
+	activeKeys := make(map[string]int, len(rows))
+	for _, row := range rows {
+		if key, ok := row["key"].(string); ok && key != "" {
+			rowID, _ := row["id"].(int)
+			activeKeys[key] = rowID
+		}
+	}
+	updated := 0
+	for key, rowID := range activeKeys {
+		if lockedID, ok := lockData[key]; ok && lockedID != rowID {
+			lockData[key] = rowID
+			updated++
+		}
+	}
+	pruned := 0
+	for key := range lockData {
+		if _, ok := activeKeys[key]; ok {
+			continue
+		}
+		if _, ok := referencedKeys[key]; ok {
+			continue
+		}
+		delete(lockData, key)
+		pruned++
+	}
+	return pruned, updated
+}
+
+func collectReferencedLockKeys(sourceDir string) (map[string]struct{}, error) {
+	dataDir := filepath.Join(sourceDir, "data")
+	referenced := map[string]struct{}{}
+	if _, err := os.Stat(dataDir); err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return referenced, nil
+		}
+		return nil, err
+	}
+	err := filepath.WalkDir(dataDir, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
+		if filepath.Base(path) == "lock.json" || !strings.EqualFold(filepath.Ext(path), ".json") {
+			return nil
+		}
+		obj, err := loadJSONObject(path)
+		if err != nil {
+			return err
+		}
+		collectReferencedLockKeysFromValue(obj, referenced)
+		return nil
+	})
+	return referenced, err
+}
+
+func nativeDatasetSourceDir(dataset nativeDataset) string {
+	dir := filepath.Clean(dataset.RootPath)
+	for {
+		if filepath.Base(dir) == "data" {
+			return filepath.Dir(dir)
+		}
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			return filepath.Dir(filepath.Dir(dataset.RootPath))
+		}
+		dir = parent
+	}
+}
+
+func collectReferencedLockKeysFromValue(value any, referenced map[string]struct{}) {
+	switch typed := value.(type) {
+	case string:
+		if strings.Contains(typed, ":") {
+			referenced[typed] = struct{}{}
+		}
+	case []any:
+		for _, item := range typed {
+			collectReferencedLockKeysFromValue(item, referenced)
+		}
+	case map[string]any:
+		for key, item := range typed {
+			if strings.Contains(key, ":") {
+				referenced[key] = struct{}{}
+			}
+			if key == "key" {
+				continue
+			}
+			collectReferencedLockKeysFromValue(item, referenced)
+		}
+	}
+}
+
 func dedupeCollectedRows(rows []map[string]any) []map[string]any {
 	if len(rows) <= 1 {
 		return rows
@@ -1118,7 +1363,7 @@ func (c *featGeneratedContext) featID(key string, explicit any) (int, bool, erro
 			return parsed, true, nil
 		}
 	}
-	if value, ok := c.lockData[key]; ok && value > 0 {
+	if value, ok := c.lockData[key]; ok && value >= 0 {
 		return value, true, nil
 	}
 	if value, ok := c.supplementalID[key]; ok && value > 0 {
@@ -1133,7 +1378,7 @@ func (c *featGeneratedContext) preferredGeneratedFeatKey(familyKey, sourceSlug s
 	for _, candidates := range []map[string]int{c.lockData, c.supplementalID} {
 		matches := make([]string, 0)
 		for key, value := range candidates {
-			if value <= 0 {
+			if value < 0 {
 				continue
 			}
 			if !strings.HasPrefix(key, "feat:"+familyKey+"_") {
@@ -1202,6 +1447,66 @@ func betterExpandedKey(a, b string) string {
 	return b
 }
 
+func collectExplicitModuleIDs(datasetName, sourceLabel string, moduleData map[string]any) (map[string]int, error) {
+	ids := map[string]int{}
+	if rawEntries, ok := moduleData["entries"]; ok {
+		entries, ok := rawEntries.(map[string]any)
+		if !ok {
+			return nil, fmt.Errorf("dataset %s: entries in %s must be an object", datasetName, sourceLabel)
+		}
+		for key, rawEntry := range entries {
+			entry, ok := rawEntry.(map[string]any)
+			if !ok {
+				return nil, fmt.Errorf("dataset %s: entry %q in %s must be an object", datasetName, key, sourceLabel)
+			}
+			if rawID, ok := entry["id"]; ok {
+				rowID, err := asInt(rawID)
+				if err != nil {
+					return nil, fmt.Errorf("dataset %s: entry %q id %v is not numeric", datasetName, key, rawID)
+				}
+				ids[key] = rowID
+			}
+		}
+	}
+	if rawOverrides, ok := moduleData["overrides"]; ok {
+		switch overrides := rawOverrides.(type) {
+		case []any:
+			for index, rawOverride := range overrides {
+				override, ok := rawOverride.(map[string]any)
+				if !ok {
+					return nil, fmt.Errorf("dataset %s: override %d in %s must be an object", datasetName, index, sourceLabel)
+				}
+				if rawID, ok := override["id"]; ok {
+					rowID, err := asInt(rawID)
+					if err != nil {
+						return nil, fmt.Errorf("dataset %s: override id %v is not numeric", datasetName, rawID)
+					}
+					if key, ok := override["key"].(string); ok && key != "" {
+						ids[key] = rowID
+					}
+				}
+			}
+		case map[string]any:
+			for key, rawOverride := range overrides {
+				override, ok := rawOverride.(map[string]any)
+				if !ok {
+					return nil, fmt.Errorf("dataset %s: override %q in %s must be an object", datasetName, key, sourceLabel)
+				}
+				if rawID, ok := override["id"]; ok {
+					rowID, err := asInt(rawID)
+					if err != nil {
+						return nil, fmt.Errorf("dataset %s: override id %v is not numeric", datasetName, rawID)
+					}
+					ids[key] = rowID
+				}
+			}
+		default:
+			return nil, fmt.Errorf("dataset %s: overrides in %s must be an array or object", datasetName, sourceLabel)
+		}
+	}
+	return ids, nil
+}
+
 func buildFeatGeneratedModule(path string, obj map[string]any, ctx *featGeneratedContext) (map[string]any, error) {
 	family, _ := obj["family"].(string)
 	if strings.TrimSpace(family) == "" {
@@ -3413,11 +3718,11 @@ func resolveOverrideTarget(datasetName string, override map[string]any, rowByID
 	return nil, fmt.Errorf("dataset %s: override must specify id or key", datasetName)
 }
 
-func updateOverrideRowKey(row map[string]any, expanded map[string]any, rowByKey map[string]map[string]any, lockData map[string]int) bool {
+func updateOverrideRowKey(datasetName string, row map[string]any, expanded map[string]any, rowByKey map[string]map[string]any, lockData map[string]int) (bool, error) {
 	oldKey, _ := row["key"].(string)
 	newKeyValue, hasKey := expanded["key"]
 	if !hasKey {
-		return false
+		return false, nil
 	}
 	rowID, _ := row["id"].(int)
 	changed := false
@@ -3432,20 +3737,12 @@ func updateOverrideRowKey(row map[string]any, expanded map[string]any, rowByKey
 	}
 	if newKeyValue == nil {
 		delete(row, "key")
-		if oldKey != "" {
-			delete(lockData, oldKey)
-			changed = true
-		}
-		return changed
+		return changed, nil
 	}
 	newKey, ok := newKeyValue.(string)
 	if !ok || newKey == "" {
 		delete(row, "key")
-		if oldKey != "" {
-			delete(lockData, oldKey)
-			changed = true
-		}
-		return changed
+		return changed, nil
 	}
 	if conflicting, ok := rowByKey[newKey]; ok && conflicting != nil {
 		conflictingID, conflictingHasID := conflicting["id"].(int)
@@ -3457,15 +3754,15 @@ func updateOverrideRowKey(row map[string]any, expanded map[string]any, rowByKey
 	}
 	row["key"] = newKey
 	rowByKey[newKey] = row
-	if oldKey != "" && oldKey != newKey {
-		delete(lockData, oldKey)
-		changed = true
-	}
-	if existingID, ok := lockData[newKey]; !ok || existingID != rowID {
+	if existingID, ok := lockData[newKey]; ok {
+		if existingID != rowID {
+			return false, fmt.Errorf("dataset %s: key %q is locked to id %d and cannot be rewritten to id %d", datasetName, newKey, existingID, rowID)
+		}
+	} else {
 		lockData[newKey] = rowID
 		changed = true
 	}
-	return changed
+	return changed, nil
 }
 
 func normalizeCollectedSpellImpactScripts(rows []map[string]any, baseRowKeys map[string]struct{}) {
diff --git a/internal/topdata/topdata.go b/internal/topdata/topdata.go
index f0e5f49..6c71db0 100644
--- a/internal/topdata/topdata.go
+++ b/internal/topdata/topdata.go
@@ -264,6 +264,7 @@ func ValidateProject(p *project.Project) ValidationReport {
 	})
 	validateTopPackageAssets(sourceDir, dataDir, &report)
 	validateNativeOutputCatalog(dataDir, &report)
+	validateNativeLockAllocation(dataDir, &report)
 	validateItempropsRegistryGraph(dataDir, &report)
 	if _, err := os.Stat(statePath); err == nil {
 		report.Files++
@@ -892,6 +893,118 @@ func validateNativeOutputCatalog(dataDir string, report *ValidationReport) {
 	}
 }
 
+func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
+	datasets, err := discoverNativeDatasets(dataDir)
+	if err != nil {
+		report.Diagnostics = append(report.Diagnostics, Diagnostic{
+			Severity: SeverityError,
+			Path:     dataDir,
+			Message:  fmt.Sprintf("discover native datasets for lock allocation validation: %v", err),
+		})
+		return
+	}
+	for _, dataset := range datasets {
+		if dataset.Kind != nativeDatasetBase {
+			continue
+		}
+		baseObj, err := loadJSONObject(dataset.BasePath)
+		if err != nil {
+			report.Diagnostics = append(report.Diagnostics, Diagnostic{
+				Severity: SeverityError,
+				Path:     dataset.BasePath,
+				Message:  fmt.Sprintf("load base rows for lock allocation validation: %v", err),
+			})
+			continue
+		}
+		rawRows, ok := baseObj["rows"].([]any)
+		if !ok || len(rawRows) == 0 {
+			continue
+		}
+		baseBoundaryID := len(rawRows) - 1
+		baseKeys := map[string]struct{}{}
+		for index, raw := range rawRows {
+			row, ok := raw.(map[string]any)
+			if !ok {
+				continue
+			}
+			rowID := index
+			if rawID, ok := row["id"]; ok {
+				if parsed, err := asInt(rawID); err == nil {
+					rowID = parsed
+				}
+			}
+			baseBoundaryID = rowID
+			if key, ok := row["key"].(string); ok && key != "" {
+				baseKeys[key] = struct{}{}
+			}
+		}
+		explicitModuleIDs := map[string]int{}
+		for _, dir := range []string{dataset.ModulesDir, dataset.GeneratedDir} {
+			paths, err := collectModulePaths(dir)
+			if err != nil {
+				report.Diagnostics = append(report.Diagnostics, Diagnostic{
+					Severity: SeverityError,
+					Path:     dir,
+					Message:  fmt.Sprintf("collect module paths for lock allocation validation: %v", err),
+				})
+				continue
+			}
+			for _, path := range paths {
+				obj, err := loadJSONObject(path)
+				if err != nil {
+					report.Diagnostics = append(report.Diagnostics, Diagnostic{
+						Severity: SeverityError,
+						Path:     path,
+						Message:  fmt.Sprintf("load module for lock allocation validation: %v", err),
+					})
+					continue
+				}
+				ids, err := collectExplicitModuleIDs(dataset.Name, path, obj)
+				if err != nil {
+					report.Diagnostics = append(report.Diagnostics, Diagnostic{
+						Severity: SeverityError,
+						Path:     path,
+						Message:  err.Error(),
+					})
+					continue
+				}
+				for key, rowID := range ids {
+					explicitModuleIDs[key] = rowID
+				}
+			}
+		}
+		lockData, err := loadLockfile(dataset.LockPath)
+		if err != nil {
+			report.Diagnostics = append(report.Diagnostics, Diagnostic{
+				Severity: SeverityError,
+				Path:     dataset.LockPath,
+				Message:  fmt.Sprintf("load lockfile for allocation validation: %v", err),
+			})
+			continue
+		}
+		invalid := 0
+		for key, rowID := range lockData {
+			if rowID > baseBoundaryID {
+				continue
+			}
+			if _, ok := baseKeys[key]; ok {
+				continue
+			}
+			if explicitID, ok := explicitModuleIDs[key]; ok && explicitID == rowID {
+				continue
+			}
+			invalid++
+		}
+		if invalid > 0 {
+			report.Diagnostics = append(report.Diagnostics, Diagnostic{
+				Severity: SeverityWarning,
+				Path:     dataset.LockPath,
+				Message:  fmt.Sprintf("%d lock entrie(s) are inside base id space and will be regenerated above row %d", invalid, baseBoundaryID),
+			})
+		}
+	}
+}
+
 func validateTopPackageAssets(sourceDir, dataDir string, report *ValidationReport) {
 	assetsDir := filepath.Join(sourceDir, "assets")
 	generated2DADir := filepath.Join(assetsDir, "2da")
@@ -1031,6 +1144,16 @@ func validateNativeBuildability(p *project.Project, report *ValidationReport) {
 
 	clone := *p
 	clone.Config.TopData.Build = tempBuild
+	lockSnapshot, err := snapshotLockfiles(dataDir)
+	if err != nil {
+		report.Diagnostics = append(report.Diagnostics, Diagnostic{
+			Severity: SeverityError,
+			Path:     dataDir,
+			Message:  fmt.Sprintf("snapshot lockfiles for validation build: %v", err),
+		})
+		return
+	}
+	defer restoreLockfiles(lockSnapshot)
 	if _, err := buildNativeUnchecked(&clone, nil, nil); err != nil {
 		report.Diagnostics = append(report.Diagnostics, Diagnostic{
 			Severity: SeverityError,
@@ -1040,6 +1163,53 @@ func validateNativeBuildability(p *project.Project, report *ValidationReport) {
 	}
 }
 
+type lockfileSnapshot struct {
+	Root  string
+	Files map[string][]byte
+}
+
+func snapshotLockfiles(dataDir string) (lockfileSnapshot, error) {
+	snapshot := lockfileSnapshot{
+		Root:  dataDir,
+		Files: map[string][]byte{},
+	}
+	err := filepath.WalkDir(dataDir, func(path string, d fs.DirEntry, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if d.IsDir() || filepath.Base(path) != "lock.json" {
+			return nil
+		}
+		raw, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+		snapshot.Files[path] = raw
+		return nil
+	})
+	return snapshot, err
+}
+
+func restoreLockfiles(snapshot lockfileSnapshot) {
+	seen := map[string]struct{}{}
+	for path, raw := range snapshot.Files {
+		seen[path] = struct{}{}
+		if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+			continue
+		}
+		_ = os.WriteFile(path, raw, 0o644)
+	}
+	_ = filepath.WalkDir(snapshot.Root, func(path string, d fs.DirEntry, walkErr error) error {
+		if walkErr != nil || d.IsDir() || filepath.Base(path) != "lock.json" {
+			return nil
+		}
+		if _, ok := seen[path]; !ok {
+			_ = os.Remove(path)
+		}
+		return nil
+	})
+}
+
 func validateRowCollection(path string, obj map[string]any, rows []any, report *ValidationReport) {
 	columns := extractValidationColumns(obj)
 	rowHasIdentity := func(row map[string]any, fallbackID int) (string, bool) {
diff --git a/internal/topdata/topdata_test.go b/internal/topdata/topdata_test.go
index 9369611..1be9bec 100644
--- a/internal/topdata/topdata_test.go
+++ b/internal/topdata/topdata_test.go
@@ -5975,6 +5975,372 @@ func TestResolveOverrideTargetPrefersIDOverKey(t *testing.T) {
 	}
 }
 
+func TestBuildPrunesLockedIDThatTargetsManualBaseSpace(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "dense", "modules"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "base.json"), `{
+  "output": "dense.2da",
+  "columns": ["Label", "Value"],
+  "rows": [
+    {"id": 0, "Label": "****", "Value": "****"},
+    {"id": 1, "key": "dense:base", "Label": "Base", "Value": "base"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "lock.json"), `{
+  "dense:new": 0,
+  "dense:base": 1
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "modules", "entries.json"), `{
+  "entries": {
+    "dense:new": {
+      "Label": "New",
+      "Value": "new"
+    }
+  }
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	got, err := os.ReadFile(filepath.Join(result.Output2DADir, "dense.2da"))
+	if err != nil {
+		t.Fatalf("read dense.2da: %v", err)
+	}
+	text := string(got)
+	if !strings.Contains(text, "0\t****\t****\n") {
+		t.Fatalf("expected manual null row 0 to be preserved, got:\n%s", text)
+	}
+	if !strings.Contains(text, "2\tNew\tnew\n") {
+		t.Fatalf("expected generated entry to be regenerated after base boundary, got:\n%s", text)
+	}
+	lockRaw, err := os.ReadFile(filepath.Join(root, "topdata", "data", "dense", "lock.json"))
+	if err != nil {
+		t.Fatalf("read lock: %v", err)
+	}
+	if !strings.Contains(string(lockRaw), `"dense:new": 2`) {
+		t.Fatalf("expected invalid low lock id to be regenerated at row 2, got:\n%s", string(lockRaw))
+	}
+}
+
+func TestBuildPrunesBaseKeyAfterOverrideRenamesRow(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "dense", "modules"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "base.json"), `{
+  "output": "dense.2da",
+  "columns": ["Label", "Value"],
+  "rows": [
+    {"id": 0, "key": "dense:old", "Label": "Old", "Value": "old"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "lock.json"), `{
+  "dense:old": 0
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "modules", "rename.json"), `{
+  "overrides": [
+    {
+      "id": 0,
+      "key": "dense:new",
+      "Label": "New",
+      "Value": "new"
+    }
+  ]
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	got, err := os.ReadFile(filepath.Join(result.Output2DADir, "dense.2da"))
+	if err != nil {
+		t.Fatalf("read dense.2da: %v", err)
+	}
+	if !strings.Contains(string(got), "0\tNew\tnew\n") {
+		t.Fatalf("expected renamed row override to win, got:\n%s", string(got))
+	}
+	lockRaw, err := os.ReadFile(filepath.Join(root, "topdata", "data", "dense", "lock.json"))
+	if err != nil {
+		t.Fatalf("read lock: %v", err)
+	}
+	lockText := string(lockRaw)
+	if strings.Contains(lockText, `"dense:old"`) {
+		t.Fatalf("expected old base key to be pruned after row rename, got:\n%s", lockText)
+	}
+	if !strings.Contains(lockText, `"dense:new": 0`) {
+		t.Fatalf("expected new override key to be locked to row 0, got:\n%s", lockText)
+	}
+}
+
+func TestBuildDuplicateBaseKeyUsesSurvivingRowAfterOverrideRename(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "dense", "modules"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "base.json"), `{
+  "output": "dense.2da",
+  "columns": ["Label", "Value"],
+  "rows": [
+    {"id": 3, "key": "dense:duplicate", "Label": "Renamed", "Value": "renamed"},
+    {"id": 7, "key": "dense:duplicate", "Label": "Survivor", "Value": "survivor"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "lock.json"), `{
+  "dense:duplicate": 3
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "modules", "rename.json"), `{
+  "overrides": [
+    {
+      "id": 3,
+      "key": "dense:renamed",
+      "Label": "Renamed",
+      "Value": "renamed"
+    }
+  ]
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	got, err := os.ReadFile(filepath.Join(result.Output2DADir, "dense.2da"))
+	if err != nil {
+		t.Fatalf("read dense.2da: %v", err)
+	}
+	text := string(got)
+	if !strings.Contains(text, "3\tRenamed\trenamed\n") || !strings.Contains(text, "7\tSurvivor\tsurvivor\n") {
+		t.Fatalf("expected renamed and surviving duplicate-key rows to keep distinct ids, got:\n%s", text)
+	}
+	lockRaw, err := os.ReadFile(filepath.Join(root, "topdata", "data", "dense", "lock.json"))
+	if err != nil {
+		t.Fatalf("read lock: %v", err)
+	}
+	lockText := string(lockRaw)
+	if !strings.Contains(lockText, `"dense:renamed": 3`) {
+		t.Fatalf("expected renamed key to keep original row id, got:\n%s", lockText)
+	}
+	if !strings.Contains(lockText, `"dense:duplicate": 7`) {
+		t.Fatalf("expected surviving duplicate key to lock to surviving row id, got:\n%s", lockText)
+	}
+}
+
+func TestBuildDuplicateBaseKeyUsesEarlierSurvivingRowAfterOverrideRename(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "dense", "modules"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "base.json"), `{
+  "output": "dense.2da",
+  "columns": ["Label", "Value"],
+  "rows": [
+    {"id": 3, "key": "dense:duplicate", "Label": "Survivor", "Value": "survivor"},
+    {"id": 7, "key": "dense:duplicate", "Label": "Renamed", "Value": "renamed"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "lock.json"), `{
+  "dense:duplicate": 7
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "modules", "rename.json"), `{
+  "overrides": [
+    {
+      "id": 7,
+      "key": "dense:renamed",
+      "Label": "Renamed",
+      "Value": "renamed"
+    }
+  ]
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	got, err := os.ReadFile(filepath.Join(result.Output2DADir, "dense.2da"))
+	if err != nil {
+		t.Fatalf("read dense.2da: %v", err)
+	}
+	text := string(got)
+	if !strings.Contains(text, "3\tSurvivor\tsurvivor\n") || !strings.Contains(text, "7\tRenamed\trenamed\n") {
+		t.Fatalf("expected surviving and renamed duplicate-key rows to keep distinct ids, got:\n%s", text)
+	}
+	lockRaw, err := os.ReadFile(filepath.Join(root, "topdata", "data", "dense", "lock.json"))
+	if err != nil {
+		t.Fatalf("read lock: %v", err)
+	}
+	lockText := string(lockRaw)
+	if !strings.Contains(lockText, `"dense:renamed": 7`) {
+		t.Fatalf("expected renamed key to keep original row id, got:\n%s", lockText)
+	}
+	if !strings.Contains(lockText, `"dense:duplicate": 3`) {
+		t.Fatalf("expected surviving duplicate key to lock to surviving row id, got:\n%s", lockText)
+	}
+}
+
+func TestBuildAutoAllocatedRowsReserveExplicitModuleIDs(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "dense", "modules"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "base.json"), `{
+  "output": "dense.2da",
+  "columns": ["Label", "Value"],
+  "rows": [
+    {"id": 0, "key": "dense:base", "Label": "Base", "Value": "base"},
+    {"id": 1, "Label": "****", "Value": "****"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "lock.json"), `{
+  "dense:base": 0
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "modules", "a_entries.json"), `{
+  "entries": {
+    "dense:auto": {
+      "Label": "Auto",
+      "Value": "auto"
+    }
+  }
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "dense", "modules", "z_explicit.json"), `{
+  "overrides": [
+    {
+      "key": "dense:explicit",
+      "id": 2,
+      "Label": "Explicit",
+      "Value": "explicit"
+    }
+  ]
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	got, err := os.ReadFile(filepath.Join(result.Output2DADir, "dense.2da"))
+	if err != nil {
+		t.Fatalf("read dense.2da: %v", err)
+	}
+	text := string(got)
+	if !strings.Contains(text, "2\tExplicit\texplicit\n") {
+		t.Fatalf("expected explicit module id 2 to be preserved, got:\n%s", text)
+	}
+	if !strings.Contains(text, "3\tAuto\tauto\n") {
+		t.Fatalf("expected auto entry to skip explicit module id 2, got:\n%s", text)
+	}
+}
+
+func TestBuildGeneratedApplyAfterPrunesLowLockedID(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "feat", "generated"))
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "feat", "modules"))
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "masterfeats"))
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "skills"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "masterfeats", "base.json"), `{
+  "output": "masterfeats.2da",
+  "columns": ["Label", "STRREF", "DESCRIPTION"],
+  "rows": [
+    {"id": 10, "key": "masterfeats:skillfocus", "Label": "SkillFocus", "STRREF": "100", "DESCRIPTION": "1000"},
+    {"id": 11, "key": "masterfeats:greaterskillfocus", "Label": "GreaterSkillFocus", "STRREF": "101", "DESCRIPTION": "1001"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "masterfeats", "lock.json"), `{
+  "masterfeats:skillfocus": 10,
+  "masterfeats:greaterskillfocus": 11
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "skills", "base.json"), `{
+  "output": "skills.2da",
+  "columns": ["Label", "HideFromLevelUp"],
+  "rows": [
+    {"id": 0, "key": "skills:profession_herbalist", "Label": "Profession Herbalist", "HideFromLevelUp": "0"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "skills", "lock.json"), `{
+  "skills:profession_herbalist": 0
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "base.json"), `{
+  "output": "feat.2da",
+  "columns": ["Label", "FEAT", "MASTERFEAT", "REQSKILL", "Constant"],
+  "rows": [
+    {"id": 0, "Label": "****", "FEAT": "****", "MASTERFEAT": "****", "REQSKILL": "****", "Constant": "****"},
+    {"id": 10, "key": "feat:skillfocus", "Label": "SkillFocus", "FEAT": "100", "MASTERFEAT": "10", "REQSKILL": "****", "Constant": "FEAT_SKILL_FOCUS"}
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "lock.json"), `{
+  "feat:skillfocus": 10,
+  "feat:skillfocus_professionherbalist": 0,
+  "feat:greaterskillfocus_professionherbalist": 0
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "modules", "removed.json"), `{
+  "overrides": [
+    {
+      "key": null,
+      "id": 0,
+      "Label": "****",
+      "FEAT": "****",
+      "MASTERFEAT": "****",
+      "REQSKILL": "****",
+      "Constant": "****"
+    }
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "generated", "greater_skill_focus.json"), `{
+  "family": "greater_skill_focus",
+  "family_key": "greaterskillfocus",
+  "template": "masterfeats:greaterskillfocus",
+  "apply_after_modules": true,
+  "child_ref_field": "REQSKILL",
+  "child_source": {
+    "dataset": "skills",
+    "predicate": "accessible"
+  },
+  "label_prefix": "GREATER_SKILL_FOCUS",
+  "name_prefix": "Greater Skill Focus",
+  "constant_prefix": "FEAT_GREATER_SKILL_FOCUS"
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "generated", "skill_focus.json"), `{
+  "family": "skill_focus",
+  "family_key": "skillfocus",
+  "template": "masterfeats:skillfocus",
+  "apply_after_modules": true,
+  "child_ref_field": "REQSKILL",
+  "child_source": {
+    "dataset": "skills",
+    "predicate": "accessible"
+  },
+  "label_prefix": "SKILL_FOCUS",
+  "name_prefix": "Skill Focus",
+  "constant_prefix": "FEAT_SKILL_FOCUS",
+  "template_fields": ["FEAT", "MASTERFEAT"]
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	got, err := os.ReadFile(filepath.Join(result.Output2DADir, "feat.2da"))
+	if err != nil {
+		t.Fatalf("read feat.2da: %v", err)
+	}
+	text := string(got)
+	if !strings.Contains(text, "0\t****\t****\t****\t****\t****\n") {
+		t.Fatalf("expected manual null row 0 to be preserved, got:\n%s", text)
+	}
+	if !strings.Contains(text, "11\tGREATER_SKILL_FOCUS_PROFESSION_HERBALIST\t16777216\t11\t0\tFEAT_GREATER_SKILL_FOCUS_PROFESSION_HERBALIST\n") {
+		t.Fatalf("expected greater skill focus to regenerate after base boundary, got:\n%s", text)
+	}
+	if !strings.Contains(text, "12\tSKILL_FOCUS_PROFESSION_HERBALIST\t****\t****\t0\tFEAT_SKILL_FOCUS_PROFESSION_HERBALIST\n") {
+		t.Fatalf("expected skill focus to regenerate after base boundary, got:\n%s", text)
+	}
+	lockRaw, err := os.ReadFile(filepath.Join(root, "topdata", "data", "feat", "lock.json"))
+	if err != nil {
+		t.Fatalf("read lock: %v", err)
+	}
+	if !strings.Contains(string(lockRaw), `"feat:skillfocus_profession_herbalist": 12`) {
+		t.Fatalf("expected generated skill focus lock id to be regenerated at row 12, got:\n%s", string(lockRaw))
+	}
+	if !strings.Contains(string(lockRaw), `"feat:greaterskillfocus_profession_herbalist": 11`) {
+		t.Fatalf("expected generated greater skill focus lock id to be regenerated at row 11, got:\n%s", string(lockRaw))
+	}
+}
+
 func TestBuildCanonicalBaseitemsMatchesReference(t *testing.T) {
 	root := testProjectRoot(t)
 	mkdirAll(t, filepath.Join(root, "topdata", "data"))
@@ -6179,6 +6545,7 @@ func TestBuildInjectsExpansionDataIntoTargetDataset(t *testing.T) {
         "value": "po_cclaw_",
         "data": {
           "portraits": {
+            "key": "portraits:cclaw_",
             "BaseResRef": "cclaw_",
             "Sex": 4,
             "Race": 10,
@@ -6257,6 +6624,7 @@ func TestBuildExpansionDataDoesNotDuplicatePortraitRows(t *testing.T) {
         "value": "po_zk_",
         "data": {
           "portraits": {
+            "key": "portraits:zk_",
             "BaseResRef": "zk_",
             "Sex": 4,
             "Race": 23,
@@ -6271,6 +6639,7 @@ func TestBuildExpansionDataDoesNotDuplicatePortraitRows(t *testing.T) {
         "value": "po_zk_",
         "data": {
           "portraits": {
+            "key": "portraits:zk_",
             "BaseResRef": "zk_",
             "Sex": 4,
             "Race": 23,
@@ -6307,6 +6676,124 @@ func TestBuildExpansionDataDoesNotDuplicatePortraitRows(t *testing.T) {
 	}
 }
 
+func TestBuildExpansionDataIsGlobalAndPrunesStaleInjectedLocks(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "source", "modules"))
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "target"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+
+	writeFile(t, filepath.Join(root, "topdata", "data", "source", "base.json"), `{
+  "output": "source.2da",
+  "columns": ["Label", "Link"],
+  "rows": []
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "source", "lock.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "target", "base.json"), `{
+  "output": "target.2da",
+  "columns": ["Label", "Value"],
+  "rows": []
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "target", "lock.json"), "{}\n")
+
+	modulePath := filepath.Join(root, "topdata", "data", "source", "modules", "inject.json")
+	writeFile(t, modulePath, `{
+  "entries": {
+    "source:one": {
+      "Label": "One",
+      "Link": {
+        "value": "target-one",
+        "data": {
+          "target": {
+            "key": "target:one",
+            "Label": "Target One",
+            "Value": "one"
+          }
+        }
+      }
+    }
+  }
+}`+"\n")
+
+	result, err := BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative failed: %v", err)
+	}
+	targetBytes, err := os.ReadFile(filepath.Join(result.Output2DADir, "target.2da"))
+	if err != nil {
+		t.Fatalf("read target.2da: %v", err)
+	}
+	if !strings.Contains(string(targetBytes), "0\t\"Target One\"\tone\n") {
+		t.Fatalf("expected injected target row, got:\n%s", string(targetBytes))
+	}
+	lockBytes, err := os.ReadFile(filepath.Join(root, "topdata", "data", "target", "lock.json"))
+	if err != nil {
+		t.Fatalf("read target lock.json: %v", err)
+	}
+	if !strings.Contains(string(lockBytes), `"target:one": 0`) {
+		t.Fatalf("expected lock entry for injected target row, got:\n%s", string(lockBytes))
+	}
+
+	writeFile(t, modulePath, `{
+  "entries": {
+    "source:one": {
+      "Label": "One",
+      "Link": {
+        "value": "target-two",
+        "data": {
+          "target": {
+            "key": "target:two",
+            "Label": "Target Two",
+            "Value": "two"
+          }
+        }
+      }
+    }
+  }
+}`+"\n")
+	result, err = BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative after alteration failed: %v", err)
+	}
+	targetBytes, err = os.ReadFile(filepath.Join(result.Output2DADir, "target.2da"))
+	if err != nil {
+		t.Fatalf("read altered target.2da: %v", err)
+	}
+	targetText := string(targetBytes)
+	if strings.Contains(targetText, "Target One") || !strings.Contains(targetText, "0\t\"Target Two\"\ttwo\n") {
+		t.Fatalf("expected altered injected target row only, got:\n%s", targetText)
+	}
+	lockBytes, err = os.ReadFile(filepath.Join(root, "topdata", "data", "target", "lock.json"))
+	if err != nil {
+		t.Fatalf("read altered target lock.json: %v", err)
+	}
+	lockText := string(lockBytes)
+	if strings.Contains(lockText, "target:one") || !strings.Contains(lockText, `"target:two": 0`) {
+		t.Fatalf("expected stale injected lock to be pruned after alteration, got:\n%s", lockText)
+	}
+
+	if err := os.Remove(modulePath); err != nil {
+		t.Fatalf("remove injection module: %v", err)
+	}
+	result, err = BuildNative(testProject(root), nil)
+	if err != nil {
+		t.Fatalf("BuildNative after deletion failed: %v", err)
+	}
+	targetBytes, err = os.ReadFile(filepath.Join(result.Output2DADir, "target.2da"))
+	if err != nil {
+		t.Fatalf("read deleted target.2da: %v", err)
+	}
+	if strings.Contains(string(targetBytes), "Target Two") {
+		t.Fatalf("expected injected target row to be removed after module deletion, got:\n%s", string(targetBytes))
+	}
+	lockBytes, err = os.ReadFile(filepath.Join(root, "topdata", "data", "target", "lock.json"))
+	if err != nil {
+		t.Fatalf("read deleted target lock.json: %v", err)
+	}
+	if strings.Contains(string(lockBytes), "target:two") {
+		t.Fatalf("expected injected target lock to be pruned after module deletion, got:\n%s", string(lockBytes))
+	}
+}
+
 func TestValidateProjectRejectsUnknownMetadataKey(t *testing.T) {
 	root := testProjectRoot(t)
 	mkdirAll(t, filepath.Join(root, "topdata", "data", "placeables"))