diff --git a/internal/aggregator/autocreate.go b/internal/aggregator/autocreate.go
index 941758753..6efb3068e 100644
--- a/internal/aggregator/autocreate.go
+++ b/internal/aggregator/autocreate.go
@@ -54,7 +54,6 @@ type KnownTag struct {
 	ID          string   `json:"id,omitempty"`
 	Description string   `json:"description,omitempty"`
 	RawKind     string   `json:"raw_kind,omitempty"`
-	SkipMapping bool     `json:"skip_mapping,omitempty"`
 	Whitelist   []string `json:"whitelist,omitempty"`
 }
 
@@ -389,9 +388,6 @@ func publishDraftTags(meta *format.MetricMetaValue, knownTags []KnownTag) int {
 						draftTag.RawKind = rawKind
 					}
 				}
-				if knownTag.SkipMapping {
-					draftTag.SkipMapping = true
-				}
 				if len(meta.Tags) <= x {
 					meta.Tags = append(make([]format.MetricMetaTag, 0, x+1), meta.Tags...)
 					meta.Tags = meta.Tags[:x+1]
diff --git a/internal/api/handler_easyjson.go b/internal/api/handler_easyjson.go
index e64acde9b..95737de48 100644
--- a/internal/api/handler_easyjson.go
+++ b/internal/api/handler_easyjson.go
@@ -844,8 +844,6 @@ func easyjson888c126aDecodeGithubComVkcomStatshouseInternalFormat1(in *jlexer.Le
 				}
 				in.Delim('}')
 			}
-		case "skip_mapping":
-			out.SkipMapping = bool(in.Bool())
 		default:
 			in.SkipRecursive()
 		}
@@ -944,16 +942,6 @@ func easyjson888c126aEncodeGithubComVkcomStatshouseInternalFormat1(out *jwriter.
 			out.RawByte('}')
 		}
 	}
-	if in.SkipMapping {
-		const prefix string = ",\"skip_mapping\":"
-		if first {
-			first = false
-			out.RawString(prefix[1:])
-		} else {
-			out.RawString(prefix)
-		}
-		out.Bool(bool(in.SkipMapping))
-	}
 	out.RawByte('}')
 }
 func easyjson888c126aDecodeGithubComVkcomStatshouseInternalApi3(in *jlexer.Lexer, out *querySeries) {
diff --git a/internal/api/sql.go b/internal/api/sql.go
index db43957ff..858402fb3 100644
--- a/internal/api/sql.go
+++ b/internal/api/sql.go
@@ -224,6 +224,7 @@ func (b *queryBuilder) writeTagCond(lod *data_model.LOD, in bool) {
 		sep, predicate = " AND ", " NOT IN "
 	}
 	metric := b.singleMetric()
+	version3StrcmpOn := b.version3StrcmpOn(metric, lod)
 	for i, filter := range f.Tags {
 		if filter.Empty() {
 			continue
@@ -231,7 +232,6 @@ func (b *queryBuilder) writeTagCond(lod *data_model.LOD, in bool) {
 		b.WriteString(" AND (")
 		// mapped
 		tagID := format.TagID(i)
-		version3StrcmpOn := b.version3StrcmpOn(metric, i, lod)
 		var hasMapped bool
 		var hasValue bool
 		var version3HasEmpty bool
diff --git a/internal/api/sql_v3.go b/internal/api/sql_v3.go
index 833a95040..00cf4094f 100644
--- a/internal/api/sql_v3.go
+++ b/internal/api/sql_v3.go
@@ -101,12 +101,8 @@ func (b *queryBuilder) tagValueIDsQueryV3(lod *data_model.LOD) *tagValuesSelectC
 	return &q
 }
 
-func (b *queryBuilder) version3StrcmpOn(metric *format.MetricMetaValue, tagX int, lod *data_model.LOD) bool {
-	version3StrcmpOn := lod.Version == Version3 && !b.strcmpOff
-	if !version3StrcmpOn || metric == nil || len(metric.Tags) <= tagX {
-		return version3StrcmpOn
-	}
-	return metric.Tags[tagX].SkipMapping
+func (b *queryBuilder) version3StrcmpOn(metric *format.MetricMetaValue, lod *data_model.LOD) bool {
+	return lod.Version == Version3 && !b.strcmpOff
 }
 
 func (b *queryBuilder) mappedColumnNameV3(tagID string, lod *data_model.LOD) string {
diff --git a/internal/format/format.go b/internal/format/format.go
index 5e3daf8fc..cd8bf80e4 100644
--- a/internal/format/format.go
+++ b/internal/format/format.go
@@ -152,7 +152,6 @@ type MetricMetaTag struct {
 	RawKind       string            `json:"raw_kind,omitempty"` // UI can show some raw values beautifully - timestamps, hex values, etc.
 	ID2Value      map[int32]string  `json:"id2value,omitempty"`
 	ValueComments map[string]string `json:"value_comments,omitempty"`
-	SkipMapping   bool              `json:"skip_mapping,omitempty"` // used only in v3 conveyor
 
 	Comment2Value map[string]string `json:"-"` // Should be restored from ValueComments after reading
 	IsMetric      bool              `json:"-"` // Only for built-in metrics so never saved or parsed
diff --git a/internal/mapping/pipeline_v2.go b/internal/mapping/pipeline_v2.go
index e5c6c3a48..b54e80470 100644
--- a/internal/mapping/pipeline_v2.go
+++ b/internal/mapping/pipeline_v2.go
@@ -77,8 +77,6 @@ func (mp *mapPipelineV2) mapTags(h *data_model.MappedMetricHeader, metric *tlsta
 			continue
 		}
 		switch {
-		case tagMeta.SkipMapping:
-			h.SetSTag(tagMeta.Index, v.Value, tagIDKey)
 		case tagMeta.Index == format.StringTopTagIndex:
 			h.TopValue.S = v.Value
 			if h.IsSKeySet {