common/schema: turns into a component

This is a first step to make it accept configuration. Most of the changes are quite trivial, but I also ran into some difficulties with query columns and filters. They need the schema for parsing, but parsing happens before dependencies are instantiated (and even if it was not the case, parsing is stateless). Therefore, I have added a `Validate()` method that must be called after instantiation. Various bits `panic()` if not validated to ensure we catch all cases. The alternative to make the component manages a global state would have been simpler but it would break once we add the ability to add or disable columns.
2025-12-11 22:14:02 +01:00 · 2023-01-18 12:14:23 +01:00
parent 3c55f90fdf
commit c6a9319b57
58 changed files with 1049 additions and 655 deletions
--- a/cmd/console.go
+++ b/cmd/console.go
@@ -12,6 +12,7 @@ import (
 	"akvorado/common/daemon"
 	"akvorado/common/http"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 	"akvorado/console"
 	"akvorado/console/authentication"
 	"akvorado/console/database"
@@ -103,12 +104,17 @@ func consoleStart(r *reporter.Reporter, config ConsoleConfiguration, checkOnly b
 	if err != nil {
 		return fmt.Errorf("unable to initialize database component: %w", err)
 	}
+	schemaComponent, err := schema.New()
+	if err != nil {
+		return fmt.Errorf("unable to initialize schema component: %w", err)
+	}
 	consoleComponent, err := console.New(r, config.Console, console.Dependencies{
 		Daemon:       daemonComponent,
 		HTTP:         httpComponent,
 		ClickHouseDB: clickhouseComponent,
 		Auth:         authenticationComponent,
 		Database:     databaseComponent,
+		Schema:       schemaComponent,
 	})
 	if err != nil {
 		return fmt.Errorf("unable to initialize console component: %w", err)
--- a/cmd/inlet.go
+++ b/cmd/inlet.go
@@ -11,6 +11,7 @@ import (
 	"akvorado/common/daemon"
 	"akvorado/common/http"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 	"akvorado/inlet/bmp"
 	"akvorado/inlet/core"
 	"akvorado/inlet/flow"
@@ -95,9 +96,14 @@ func inletStart(r *reporter.Reporter, config InletConfiguration, checkOnly bool)
 	if err != nil {
 		return fmt.Errorf("unable to initialize http component: %w", err)
 	}
+	schemaComponent, err := schema.New()
+	if err != nil {
+		return fmt.Errorf("unable to initialize schema component: %w", err)
+	}
 	flowComponent, err := flow.New(r, config.Flow, flow.Dependencies{
 		Daemon: daemonComponent,
 		HTTP:   httpComponent,
+		Schema: schemaComponent,
 	})
 	if err != nil {
 		return fmt.Errorf("unable to initialize flow component: %w", err)
@@ -122,6 +128,7 @@ func inletStart(r *reporter.Reporter, config InletConfiguration, checkOnly bool)
 	}
 	kafkaComponent, err := kafka.New(r, config.Kafka, kafka.Dependencies{
 		Daemon: daemonComponent,
+		Schema: schemaComponent,
 	})
 	if err != nil {
 		return fmt.Errorf("unable to initialize Kafka component: %w", err)
@@ -134,6 +141,7 @@ func inletStart(r *reporter.Reporter, config InletConfiguration, checkOnly bool)
 		GeoIP:  geoipComponent,
 		Kafka:  kafkaComponent,
 		HTTP:   httpComponent,
+		Schema: schemaComponent,
 	})
 	if err != nil {
 		return fmt.Errorf("unable to initialize core component: %w", err)
--- a/cmd/orchestrator.go
+++ b/cmd/orchestrator.go
@@ -12,6 +12,7 @@ import (
 	"akvorado/common/daemon"
 	"akvorado/common/http"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 	"akvorado/orchestrator"
 	"akvorado/orchestrator/clickhouse"
 	"akvorado/orchestrator/kafka"
@@ -111,7 +112,11 @@ func orchestratorStart(r *reporter.Reporter, config OrchestratorConfiguration, c
 	if err != nil {
 		return fmt.Errorf("unable to initialize HTTP component: %w", err)
 	}
-	kafkaComponent, err := kafka.New(r, config.Kafka)
+	schemaComponent, err := schema.New()
+	if err != nil {
+		return fmt.Errorf("unable to initialize schema component: %w", err)
+	}
+	kafkaComponent, err := kafka.New(r, config.Kafka, kafka.Dependencies{Schema: schemaComponent})
 	if err != nil {
 		return fmt.Errorf("unable to initialize kafka component: %w", err)
 	}
@@ -125,6 +130,7 @@ func orchestratorStart(r *reporter.Reporter, config OrchestratorConfiguration, c
 		Daemon:     daemonComponent,
 		HTTP:       httpComponent,
 		ClickHouse: clickhouseDBComponent,
+		Schema:     schemaComponent,
 	})
 	if err != nil {
 		return fmt.Errorf("unable to initialize clickhouse component: %w", err)
--- a/common/helpers/tests_diff.go
+++ b/common/helpers/tests_diff.go
@@ -23,12 +23,24 @@ var prettyC = pretty.Config{
 }

 func defaultPrettyFormatters() map[reflect.Type]interface{} {
-	return map[reflect.Type]interface{}{
+	result := map[reflect.Type]interface{}{
 		reflect.TypeOf(net.IP{}):            fmt.Sprint,
 		reflect.TypeOf(netip.Addr{}):        fmt.Sprint,
 		reflect.TypeOf(time.Time{}):         fmt.Sprint,
 		reflect.TypeOf(SubnetMap[string]{}): fmt.Sprint,
 	}
+	for t, fn := range nonDefaultPrettyFormatters {
+		result[t] = fn
+	}
+	return result
+}
+
+var nonDefaultPrettyFormatters = map[reflect.Type]interface{}{}
+
+// AddPrettyFormatter add a global pretty formatter. We cannot put everything in
+// the default map due to cycles.
+func AddPrettyFormatter(t reflect.Type, fn interface{}) {
+	nonDefaultPrettyFormatters[t] = fn
 }

 // DiffOption changes the behavior of the Diff function.
--- a/common/schema/definition.go
+++ b/common/schema/definition.go
@@ -151,165 +151,167 @@ func (c ColumnKey) String() string {
 // Flows is the data schema for flows tables. Any column starting with Src/InIf
 // will be duplicated as Dst/OutIf during init. That's not the case for columns
 // in `PrimaryKeys'.
-var Flows = Schema{
-	clickHousePrimaryKeys: []ColumnKey{
-		ColumnTimeReceived,
-		ColumnExporterAddress,
-		ColumnEType,
-		ColumnProto,
-		ColumnInIfName,
-		ColumnSrcAS,
-		ColumnForwardingStatus,
-		ColumnOutIfName,
-		ColumnDstAS,
-		ColumnSamplingRate,
-	},
-	columns: []Column{
-		{
-			Key:                 ColumnTimeReceived,
-			ClickHouseType:      "DateTime",
-			ClickHouseCodec:     "DoubleDelta, LZ4",
-			ConsoleNotDimension: true,
-			ProtobufType:        protoreflect.Uint64Kind,
+func flows() Schema {
+	return Schema{
+		clickHousePrimaryKeys: []ColumnKey{
+			ColumnTimeReceived,
+			ColumnExporterAddress,
+			ColumnEType,
+			ColumnProto,
+			ColumnInIfName,
+			ColumnSrcAS,
+			ColumnForwardingStatus,
+			ColumnOutIfName,
+			ColumnDstAS,
+			ColumnSamplingRate,
 		},
-		{Key: ColumnSamplingRate, ClickHouseType: "UInt64", ConsoleNotDimension: true},
-		{Key: ColumnExporterAddress, ClickHouseType: "LowCardinality(IPv6)"},
-		{Key: ColumnExporterName, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{Key: ColumnExporterGroup, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{Key: ColumnExporterRole, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{Key: ColumnExporterSite, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{Key: ColumnExporterRegion, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{Key: ColumnExporterTenant, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{
-			Key:            ColumnSrcAddr,
-			MainOnly:       true,
-			ClickHouseType: "IPv6",
-		}, {
-			Key:                 ColumnSrcNetMask,
-			MainOnly:            true,
-			ClickHouseType:      "UInt8",
-			ConsoleNotDimension: true,
-		}, {
-			Key:            ColumnSrcNetPrefix,
-			MainOnly:       true,
-			ClickHouseType: "String",
-			ClickHouseAlias: `CASE
+		columns: []Column{
+			{
+				Key:                 ColumnTimeReceived,
+				ClickHouseType:      "DateTime",
+				ClickHouseCodec:     "DoubleDelta, LZ4",
+				ConsoleNotDimension: true,
+				ProtobufType:        protoreflect.Uint64Kind,
+			},
+			{Key: ColumnSamplingRate, ClickHouseType: "UInt64", ConsoleNotDimension: true},
+			{Key: ColumnExporterAddress, ClickHouseType: "LowCardinality(IPv6)"},
+			{Key: ColumnExporterName, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{Key: ColumnExporterGroup, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{Key: ColumnExporterRole, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{Key: ColumnExporterSite, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{Key: ColumnExporterRegion, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{Key: ColumnExporterTenant, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{
+				Key:            ColumnSrcAddr,
+				MainOnly:       true,
+				ClickHouseType: "IPv6",
+			}, {
+				Key:                 ColumnSrcNetMask,
+				MainOnly:            true,
+				ClickHouseType:      "UInt8",
+				ConsoleNotDimension: true,
+			}, {
+				Key:            ColumnSrcNetPrefix,
+				MainOnly:       true,
+				ClickHouseType: "String",
+				ClickHouseAlias: `CASE
 WHEN EType = 0x800 THEN concat(replaceRegexpOne(IPv6CIDRToRange(SrcAddr, (96 + SrcNetMask)::UInt8).1::String, '^::ffff:', ''), '/', SrcNetMask::String)
 WHEN EType = 0x86dd THEN concat(IPv6CIDRToRange(SrcAddr, SrcNetMask).1::String, '/', SrcNetMask::String)
 ELSE ''
 END`,
-		},
-		{Key: ColumnSrcAS, ClickHouseType: "UInt32"},
-		{
-			Key:                    ColumnSrcNetName,
-			ClickHouseType:         "LowCardinality(String)",
-			ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'name', SrcAddr, '')",
-		}, {
-			Key:                    ColumnSrcNetRole,
-			ClickHouseType:         "LowCardinality(String)",
-			ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'role', SrcAddr, '')",
-		}, {
-			Key:                    ColumnSrcNetSite,
-			ClickHouseType:         "LowCardinality(String)",
-			ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'site', SrcAddr, '')",
-		}, {
-			Key:                    ColumnSrcNetRegion,
-			ClickHouseType:         "LowCardinality(String)",
-			ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'region', SrcAddr, '')",
-		}, {
-			Key:                    ColumnSrcNetTenant,
-			ClickHouseType:         "LowCardinality(String)",
-			ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'tenant', SrcAddr, '')",
-		},
-		{Key: ColumnSrcCountry, ClickHouseType: "FixedString(2)"},
-		{
-			Key:            ColumnDstASPath,
-			MainOnly:       true,
-			ClickHouseType: "Array(UInt32)",
-		}, {
-			Key:                    ColumnDst1stAS,
-			ClickHouseType:         "UInt32",
-			ClickHouseGenerateFrom: "c_DstASPath[1]",
-		}, {
-			Key:                    ColumnDst2ndAS,
-			ClickHouseType:         "UInt32",
-			ClickHouseGenerateFrom: "c_DstASPath[2]",
-		}, {
-			Key:                    ColumnDst3rdAS,
-			ClickHouseType:         "UInt32",
-			ClickHouseGenerateFrom: "c_DstASPath[3]",
-		}, {
-			Key:            ColumnDstCommunities,
-			MainOnly:       true,
-			ClickHouseType: "Array(UInt32)",
-		}, {
-			Key:            ColumnDstLargeCommunities,
-			MainOnly:       true,
-			ClickHouseType: "Array(UInt128)",
-			ClickHouseTransformFrom: []Column{
-				{
-					Key:            ColumnDstLargeCommunitiesASN,
-					ClickHouseType: "Array(UInt32)",
+			},
+			{Key: ColumnSrcAS, ClickHouseType: "UInt32"},
+			{
+				Key:                    ColumnSrcNetName,
+				ClickHouseType:         "LowCardinality(String)",
+				ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'name', SrcAddr, '')",
+			}, {
+				Key:                    ColumnSrcNetRole,
+				ClickHouseType:         "LowCardinality(String)",
+				ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'role', SrcAddr, '')",
+			}, {
+				Key:                    ColumnSrcNetSite,
+				ClickHouseType:         "LowCardinality(String)",
+				ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'site', SrcAddr, '')",
+			}, {
+				Key:                    ColumnSrcNetRegion,
+				ClickHouseType:         "LowCardinality(String)",
+				ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'region', SrcAddr, '')",
+			}, {
+				Key:                    ColumnSrcNetTenant,
+				ClickHouseType:         "LowCardinality(String)",
+				ClickHouseGenerateFrom: "dictGetOrDefault('networks', 'tenant', SrcAddr, '')",
+			},
+			{Key: ColumnSrcCountry, ClickHouseType: "FixedString(2)"},
+			{
+				Key:            ColumnDstASPath,
+				MainOnly:       true,
+				ClickHouseType: "Array(UInt32)",
+			}, {
+				Key:                    ColumnDst1stAS,
+				ClickHouseType:         "UInt32",
+				ClickHouseGenerateFrom: "c_DstASPath[1]",
+			}, {
+				Key:                    ColumnDst2ndAS,
+				ClickHouseType:         "UInt32",
+				ClickHouseGenerateFrom: "c_DstASPath[2]",
+			}, {
+				Key:                    ColumnDst3rdAS,
+				ClickHouseType:         "UInt32",
+				ClickHouseGenerateFrom: "c_DstASPath[3]",
+			}, {
+				Key:            ColumnDstCommunities,
+				MainOnly:       true,
+				ClickHouseType: "Array(UInt32)",
+			}, {
+				Key:            ColumnDstLargeCommunities,
+				MainOnly:       true,
+				ClickHouseType: "Array(UInt128)",
+				ClickHouseTransformFrom: []Column{
+					{
+						Key:            ColumnDstLargeCommunitiesASN,
+						ClickHouseType: "Array(UInt32)",
+					},
+					{
+						Key:            ColumnDstLargeCommunitiesLocalData1,
+						ClickHouseType: "Array(UInt32)",
+					},
+					{
+						Key:            ColumnDstLargeCommunitiesLocalData2,
+						ClickHouseType: "Array(UInt32)",
+					},
 				},
-				{
-					Key:            ColumnDstLargeCommunitiesLocalData1,
-					ClickHouseType: "Array(UInt32)",
-				},
-				{
-					Key:            ColumnDstLargeCommunitiesLocalData2,
-					ClickHouseType: "Array(UInt32)",
+				ClickHouseTransformTo: "arrayMap((asn, l1, l2) -> ((bitShiftLeft(CAST(asn, 'UInt128'), 64) + bitShiftLeft(CAST(l1, 'UInt128'), 32)) + CAST(l2, 'UInt128')), DstLargeCommunitiesASN, DstLargeCommunitiesLocalData1, DstLargeCommunitiesLocalData2)",
+				ConsoleNotDimension:   true,
+			},
+			{Key: ColumnInIfName, ClickHouseType: "LowCardinality(String)"},
+			{Key: ColumnInIfDescription, ClickHouseType: "String", ClickHouseNotSortingKey: true},
+			{Key: ColumnInIfSpeed, ClickHouseType: "UInt32", ClickHouseNotSortingKey: true},
+			{Key: ColumnInIfConnectivity, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{Key: ColumnInIfProvider, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
+			{
+				Key:                     ColumnInIfBoundary,
+				ClickHouseType:          "Enum8('undefined' = 0, 'external' = 1, 'internal' = 2)",
+				ClickHouseNotSortingKey: true,
+				ProtobufType:            protoreflect.EnumKind,
+				ProtobufEnumName:        "Boundary",
+				ProtobufEnum: map[int]string{
+					0: "UNDEFINED",
+					1: "EXTERNAL",
+					2: "INTERNAL",
 				},
 			},
-			ClickHouseTransformTo: "arrayMap((asn, l1, l2) -> ((bitShiftLeft(CAST(asn, 'UInt128'), 64) + bitShiftLeft(CAST(l1, 'UInt128'), 32)) + CAST(l2, 'UInt128')), DstLargeCommunitiesASN, DstLargeCommunitiesLocalData1, DstLargeCommunitiesLocalData2)",
-			ConsoleNotDimension:   true,
-		},
-		{Key: ColumnInIfName, ClickHouseType: "LowCardinality(String)"},
-		{Key: ColumnInIfDescription, ClickHouseType: "String", ClickHouseNotSortingKey: true},
-		{Key: ColumnInIfSpeed, ClickHouseType: "UInt32", ClickHouseNotSortingKey: true},
-		{Key: ColumnInIfConnectivity, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{Key: ColumnInIfProvider, ClickHouseType: "LowCardinality(String)", ClickHouseNotSortingKey: true},
-		{
-			Key:                     ColumnInIfBoundary,
-			ClickHouseType:          "Enum8('undefined' = 0, 'external' = 1, 'internal' = 2)",
-			ClickHouseNotSortingKey: true,
-			ProtobufType:            protoreflect.EnumKind,
-			ProtobufEnumName:        "Boundary",
-			ProtobufEnum: map[int]string{
-				0: "UNDEFINED",
-				1: "EXTERNAL",
-				2: "INTERNAL",
+			{Key: ColumnEType, ClickHouseType: "UInt32"}, // TODO: UInt16 but hard to change, primary key
+			{Key: ColumnProto, ClickHouseType: "UInt32"}, // TODO: UInt8 but hard to change, primary key
+			{Key: ColumnSrcPort, ClickHouseType: "UInt16", MainOnly: true},
+			{Key: ColumnBytes, ClickHouseType: "UInt64", ClickHouseNotSortingKey: true, ConsoleNotDimension: true},
+			{Key: ColumnPackets, ClickHouseType: "UInt64", ClickHouseNotSortingKey: true, ConsoleNotDimension: true},
+			{
+				Key:                 ColumnPacketSize,
+				ClickHouseType:      "UInt64",
+				ClickHouseAlias:     "intDiv(Bytes, Packets)",
+				ConsoleNotDimension: true,
+			}, {
+				Key:            ColumnPacketSizeBucket,
+				ClickHouseType: "LowCardinality(String)",
+				ClickHouseAlias: func() string {
+					boundaries := []int{64, 128, 256, 512, 768, 1024, 1280, 1501,
+						2048, 3072, 4096, 8192, 10240, 16384, 32768, 65536}
+					conditions := []string{}
+					last := 0
+					for _, boundary := range boundaries {
+						conditions = append(conditions, fmt.Sprintf("PacketSize < %d, '%d-%d'",
+							boundary, last, boundary-1))
+						last = boundary
+					}
+					conditions = append(conditions, fmt.Sprintf("'%d-Inf'", last))
+					return fmt.Sprintf("multiIf(%s)", strings.Join(conditions, ", "))
+				}(),
 			},
+			{Key: ColumnForwardingStatus, ClickHouseType: "UInt32"}, // TODO: UInt8 but hard to change, primary key
 		},
-		{Key: ColumnEType, ClickHouseType: "UInt32"}, // TODO: UInt16 but hard to change, primary key
-		{Key: ColumnProto, ClickHouseType: "UInt32"}, // TODO: UInt8 but hard to change, primary key
-		{Key: ColumnSrcPort, ClickHouseType: "UInt16", MainOnly: true},
-		{Key: ColumnBytes, ClickHouseType: "UInt64", ClickHouseNotSortingKey: true, ConsoleNotDimension: true},
-		{Key: ColumnPackets, ClickHouseType: "UInt64", ClickHouseNotSortingKey: true, ConsoleNotDimension: true},
-		{
-			Key:                 ColumnPacketSize,
-			ClickHouseType:      "UInt64",
-			ClickHouseAlias:     "intDiv(Bytes, Packets)",
-			ConsoleNotDimension: true,
-		}, {
-			Key:            ColumnPacketSizeBucket,
-			ClickHouseType: "LowCardinality(String)",
-			ClickHouseAlias: func() string {
-				boundaries := []int{64, 128, 256, 512, 768, 1024, 1280, 1501,
-					2048, 3072, 4096, 8192, 10240, 16384, 32768, 65536}
-				conditions := []string{}
-				last := 0
-				for _, boundary := range boundaries {
-					conditions = append(conditions, fmt.Sprintf("PacketSize < %d, '%d-%d'",
-						boundary, last, boundary-1))
-					last = boundary
-				}
-				conditions = append(conditions, fmt.Sprintf("'%d-Inf'", last))
-				return fmt.Sprintf("multiIf(%s)", strings.Join(conditions, ", "))
-			}(),
-		},
-		{Key: ColumnForwardingStatus, ClickHouseType: "UInt32"}, // TODO: UInt8 but hard to change, primary key
-	},
-}.finalize()
+	}.finalize()
+}

 func (schema Schema) finalize() Schema {
 	ncolumns := []Column{}
--- a/common/schema/definition_test.go
+++ b/common/schema/definition_test.go
@@ -8,8 +8,9 @@ import (
 )

 func TestFlowsClickHouse(t *testing.T) {
-	for _, key := range Flows.clickHousePrimaryKeys {
-		if column := Flows.columnIndex[key]; column.Key == 0 {
+	c := NewMock(t)
+	for _, key := range c.clickHousePrimaryKeys {
+		if column := c.columnIndex[key]; column.Key == 0 {
 			t.Errorf("primary key %q not a column", key)
 		} else {
 			if column.ClickHouseNotSortingKey {
@@ -20,7 +21,8 @@ func TestFlowsClickHouse(t *testing.T) {
 }

 func TestFlowsProtobuf(t *testing.T) {
-	for _, column := range Flows.Columns() {
+	c := NewMock(t)
+	for _, column := range c.Columns() {
 		if column.ProtobufIndex >= 0 {
 			if column.ProtobufType == 0 {
 				t.Errorf("column %s has not protobuf type", column.Name)
@@ -30,8 +32,9 @@ func TestFlowsProtobuf(t *testing.T) {
 }

 func TestColumnIndex(t *testing.T) {
+	c := NewMock(t)
 	for i := ColumnTimeReceived; i < ColumnLast; i++ {
-		if _, ok := Flows.LookupColumnByKey(i); !ok {
+		if _, ok := c.LookupColumnByKey(i); !ok {
 			t.Errorf("column %s cannot be looked up by key", i)
 		}
 	}
--- a/common/schema/generic_test.go
+++ b/common/schema/generic_test.go
@@ -3,9 +3,12 @@

 package schema

-import "testing"
+import (
+	"testing"
+)

 func TestLookupColumnByName(t *testing.T) {
+	c := NewMock(t)
 	cases := []string{
 		"TimeReceived",
 		"InIfProvider",
@@ -14,7 +17,7 @@ func TestLookupColumnByName(t *testing.T) {
 		"ForwardingStatus",
 	}
 	for _, name := range cases {
-		column, ok := Flows.LookupColumnByName(name)
+		column, ok := c.LookupColumnByName(name)
 		if !ok {
 			t.Fatalf("LookupByName(%q) not found", name)
 		}
@@ -25,6 +28,7 @@ func TestLookupColumnByName(t *testing.T) {
 }

 func TestReverseColumnDirection(t *testing.T) {
+	c := NewMock(t)
 	cases := []struct {
 		Input  ColumnKey
 		Output ColumnKey
@@ -37,7 +41,7 @@ func TestReverseColumnDirection(t *testing.T) {
 		{ColumnExporterName, ColumnExporterName},
 	}
 	for _, tc := range cases {
-		got := Flows.ReverseColumnDirection(tc.Input)
+		got := c.ReverseColumnDirection(tc.Input)
 		if got != tc.Output {
 			t.Errorf("ReverseColumnDirection(%q) == %q but expected %q",
 				tc.Input.String(), got.String(), tc.Output.String())
--- a/common/schema/protobuf_test.go
+++ b/common/schema/protobuf_test.go
@@ -4,9 +4,7 @@
 package schema

 import (
-	"fmt"
 	"net/netip"
-	"reflect"
 	"strings"
 	"testing"

@@ -113,18 +111,19 @@ message FlowMessagevLH2TTFF7P352DSYYCJYWFCXHAM {
 }

 func TestProtobufMarshal(t *testing.T) {
+	c := NewMock(t)
 	exporterAddress := netip.MustParseAddr("::ffff:203.0.113.14")
 	bf := &FlowMessage{}
 	bf.TimeReceived = 1000
 	bf.SamplingRate = 20000
 	bf.ExporterAddress = exporterAddress
-	Flows.ProtobufAppendVarint(bf, ColumnDstAS, 65000)
-	Flows.ProtobufAppendVarint(bf, ColumnBytes, 200)
-	Flows.ProtobufAppendVarint(bf, ColumnPackets, 300)
-	Flows.ProtobufAppendVarint(bf, ColumnBytes, 300) // duplicate!
-	Flows.ProtobufAppendBytes(bf, ColumnDstCountry, []byte("FR"))
+	c.ProtobufAppendVarint(bf, ColumnDstAS, 65000)
+	c.ProtobufAppendVarint(bf, ColumnBytes, 200)
+	c.ProtobufAppendVarint(bf, ColumnPackets, 300)
+	c.ProtobufAppendVarint(bf, ColumnBytes, 300) // duplicate!
+	c.ProtobufAppendBytes(bf, ColumnDstCountry, []byte("FR"))

-	got := Flows.ProtobufMarshal(bf)
+	got := c.ProtobufMarshal(bf)

 	size, n := protowire.ConsumeVarint(got)
 	if uint64(len(got)-n) != size {
@@ -154,7 +153,7 @@ func TestProtobufMarshal(t *testing.T) {
 	})

 	t.Run("compare as protobuf message", func(t *testing.T) {
-		got := Flows.ProtobufDecode(t, got)
+		got := c.ProtobufDecode(t, got)
 		expected := FlowMessage{
 			TimeReceived:    1000,
 			SamplingRate:    20000,
@@ -166,13 +165,14 @@ func TestProtobufMarshal(t *testing.T) {
 				ColumnDstCountry: "FR",
 			},
 		}
-		if diff := helpers.Diff(got, expected, helpers.DiffFormatter(reflect.TypeOf(ColumnBytes), fmt.Sprint)); diff != "" {
+		if diff := helpers.Diff(got, expected); diff != "" {
 			t.Fatalf("ProtobufDecode() (-got, +want):\n%s", diff)
 		}
 	})
 }

 func BenchmarkProtobufMarshal(b *testing.B) {
+	c := NewMock(b)
 	exporterAddress := netip.MustParseAddr("::ffff:203.0.113.14")
 	DisableDebug(b)
 	for i := 0; i < b.N; i++ {
@@ -181,11 +181,11 @@ func BenchmarkProtobufMarshal(b *testing.B) {
 			SamplingRate:    20000,
 			ExporterAddress: exporterAddress,
 		}
-		Flows.ProtobufAppendVarint(bf, ColumnDstAS, 65000)
-		Flows.ProtobufAppendVarint(bf, ColumnBytes, 200)
-		Flows.ProtobufAppendVarint(bf, ColumnPackets, 300)
-		Flows.ProtobufAppendVarint(bf, ColumnBytes, 300) // duplicate!
-		Flows.ProtobufAppendBytes(bf, ColumnDstCountry, []byte("FR"))
-		Flows.ProtobufMarshal(bf)
+		c.ProtobufAppendVarint(bf, ColumnDstAS, 65000)
+		c.ProtobufAppendVarint(bf, ColumnBytes, 200)
+		c.ProtobufAppendVarint(bf, ColumnPackets, 300)
+		c.ProtobufAppendVarint(bf, ColumnBytes, 300) // duplicate!
+		c.ProtobufAppendBytes(bf, ColumnDstCountry, []byte("FR"))
+		c.ProtobufMarshal(bf)
 	}
 }
--- a/common/schema/root.go
+++ b/common/schema/root.go
@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: 2023 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Package schema is an abstraction of the data schema for flows used by
+// Akvorado. It is a leaky abstraction as there are multiple parts dependant of
+// the subsystem that will use it.
+package schema
+
+// Component represents the schema compomenent.
+type Component struct {
+	Schema
+}
+
+// New creates a new schema component.
+func New() (*Component, error) {
+	return &Component{
+		Schema: flows(),
+	}, nil
+}
--- a/common/schema/tests.go
+++ b/common/schema/tests.go
@@ -6,11 +6,14 @@
 package schema

 import (
+	"fmt"
 	"net/netip"
 	"reflect"
 	"strings"
 	"testing"

+	"akvorado/common/helpers"
+
 	"github.com/jhump/protoreflect/desc"
 	"github.com/jhump/protoreflect/desc/protoparse"
 	"github.com/jhump/protoreflect/dynamic"
@@ -19,7 +22,8 @@ import (

 var debug = true

-// DisableDebug disables debug during the provided test.
+// DisableDebug disables debug during the provided test. We keep this as a
+// global function for performance reason (when release, debug is a const).
 func DisableDebug(t testing.TB) {
 	debug = false
 	t.Cleanup(func() {
@@ -27,6 +31,16 @@ func DisableDebug(t testing.TB) {
 	})
 }

+// NewMock create a new schema component.
+func NewMock(t testing.TB) *Component {
+	t.Helper()
+	c, err := New()
+	if err != nil {
+		t.Fatalf("New() error:\n%+v", err)
+	}
+	return c
+}
+
 // ProtobufDecode decodes the provided protobuf message.
 func (schema *Schema) ProtobufDecode(t *testing.T, input []byte) *FlowMessage {
 	parser := protoparse.Parser{
@@ -101,3 +115,7 @@ func (schema *Schema) ProtobufDecode(t *testing.T, input []byte) *FlowMessage {

 	return &flow
 }
+
+func init() {
+	helpers.AddPrettyFormatter(reflect.TypeOf(ColumnBytes), fmt.Sprint)
+}
--- a/common/schema/types.go
+++ b/common/schema/types.go
@@ -1,9 +1,6 @@
 // SPDX-FileCopyrightText: 2022 Free Mobile
 // SPDX-License-Identifier: AGPL-3.0-only

-// Package schema is an abstraction of the data schema for flows used by
-// Akvorado. It is a leaky abstraction as there are multiple parts dependant of
-// the subsystem that will use it.
 package schema

 import (
--- a/console/clickhouse.go
+++ b/console/clickhouse.go
@@ -12,6 +12,8 @@ import (
 	"strings"
 	"text/template"
 	"time"
+
+	"akvorado/console/query"
 )

 // flowsTable describe a consolidated or unconsolidated flows table.
@@ -122,11 +124,11 @@ func templateEscape(input string) string {
 }

 // templateWhere transforms a filter to a WHERE clause
-func templateWhere(qf queryFilter) string {
-	if qf.Filter == "" {
+func templateWhere(qf query.Filter) string {
+	if qf.Direct() == "" {
 		return `{{ .Timefilter }}`
 	}
-	return fmt.Sprintf(`{{ .Timefilter }} AND (%s)`, templateEscape(qf.Filter))
+	return fmt.Sprintf(`{{ .Timefilter }} AND (%s)`, templateEscape(qf.Direct()))
 }

 // templateTable builds a template directive to select the right table
--- a/console/config.go
+++ b/console/config.go
@@ -7,7 +7,7 @@ import (
 	"net/http"
 	"time"

-	"akvorado/common/schema"
+	"akvorado/console/query"

 	"github.com/gin-gonic/gin"
 )
@@ -39,7 +39,7 @@ type VisualizeOptionsConfiguration struct {
 	// Filter  is the the filter string
 	Filter string `json:"filter"`
 	// Dimensions is the array of dimensions to use
-	Dimensions []queryColumn `json:"dimensions"`
+	Dimensions []query.Column `json:"dimensions"`
 	// Limit is the default limit to use
 	Limit int `json:"limit" validate:"min=5"`
 }
@@ -52,7 +52,7 @@ func DefaultConfiguration() Configuration {
 			Start:      "6 hours ago",
 			End:        "now",
 			Filter:     "InIfBoundary = external",
-			Dimensions: []queryColumn{queryColumn(schema.ColumnSrcAS)},
+			Dimensions: []query.Column{query.NewColumn("SrcAS")},
 			Limit:      10,
 		},
 		HomepageTopWidgets: []string{"src-as", "src-port", "protocol", "src-country", "etype"},
@@ -63,7 +63,7 @@ func DefaultConfiguration() Configuration {

 func (c *Component) configHandlerFunc(gc *gin.Context) {
 	dimensions := []string{}
-	for _, column := range schema.Flows.Columns() {
+	for _, column := range c.d.Schema.Columns() {
 		if column.ConsoleNotDimension {
 			continue
 		}
--- a/console/filter.go
+++ b/console/filter.go
@@ -42,7 +42,7 @@ func (c *Component) filterValidateHandlerFunc(gc *gin.Context) {
 		})
 		return
 	}
-	got, err := filter.Parse("", []byte(input.Filter), filter.GlobalStore("meta", &filter.Meta{}))
+	got, err := filter.Parse("", []byte(input.Filter), filter.GlobalStore("meta", &filter.Meta{Schema: c.d.Schema}))
 	if err == nil {
 		gc.JSON(http.StatusOK, filterValidateHandlerOutput{
 			Message: "ok",
@@ -85,7 +85,7 @@ func (c *Component) filterCompleteHandlerFunc(gc *gin.Context) {
 	switch input.What {
 	case "column":
 		_, err := filter.Parse("", []byte{},
-			filter.Entrypoint("ConditionExpr"), filter.GlobalStore("meta", &filter.Meta{}))
+			filter.Entrypoint("ConditionExpr"), filter.GlobalStore("meta", &filter.Meta{Schema: c.d.Schema}))
 		if err != nil {
 			for _, candidate := range filter.Expected(err) {
 				if !strings.HasSuffix(candidate, `"i`) {
@@ -102,7 +102,7 @@ func (c *Component) filterCompleteHandlerFunc(gc *gin.Context) {
 		_, err := filter.Parse("",
 			[]byte(fmt.Sprintf("%s ", input.Column)),
 			filter.Entrypoint("ConditionExpr"),
-			filter.GlobalStore("meta", &filter.Meta{}))
+			filter.GlobalStore("meta", &filter.Meta{Schema: c.d.Schema}))
 		if err != nil {
 			for _, candidate := range filter.Expected(err) {
 				if !strings.HasPrefix(candidate, `"`) {
@@ -213,7 +213,7 @@ LIMIT 20`
 				Label  string `ch:"label"`
 				Detail string `ch:"detail"`
 			}{}
-			columnName := fixQueryColumnName(input.Column)
+			columnName := c.fixQueryColumnName(input.Column)
 			if columnName == "DstASPath" {
 				columnName = "DstAS"
 			}
@@ -270,7 +270,7 @@ LIMIT 20`, attributeName, attributeName, attributeName), input.Prefix); err != n
 			}
 			input.Prefix = ""
 		case "exportername", "exportergroup", "exporterrole", "exportersite", "exporterregion", "exportertenant":
-			column = fixQueryColumnName(inputColumn)
+			column = c.fixQueryColumnName(inputColumn)
 			detail = fmt.Sprintf("exporter %s", inputColumn[8:])
 		case "inifname", "outifname":
 			column = "IfName"
--- a/console/filter/error_test.go
+++ b/console/filter/error_test.go
@@ -7,13 +7,14 @@ import (
 	"testing"

 	"akvorado/common/helpers"
+	"akvorado/common/schema"
 )

 func TestFilterHumanError(t *testing.T) {
 	_, err := Parse("", []byte(`
 InIfDescription = "Gi0/0/0/0"
 AND Proto = 1000
-OR `), GlobalStore("meta", &Meta{}))
+OR `), GlobalStore("meta", &Meta{Schema: schema.NewMock(t)}))
 	expected := "at line 3, position 13: expecting an unsigned 8-bit integer"
 	if diff := helpers.Diff(HumanError(err), expected); diff != "" {
 		t.Errorf("HumanError() (-got, +want):\n%s", diff)
@@ -24,7 +25,7 @@ func TestAllErrors(t *testing.T) {
 	_, err := Parse("", []byte(`
 InIfDescription = "Gi0/0/0/0"
 AND Proto = 1000
-OR`), GlobalStore("meta", &Meta{}))
+OR`), GlobalStore("meta", &Meta{Schema: schema.NewMock(t)}))
 	// Currently, the parser stops at the first error.
 	expected := Errors{
 		oneError{
@@ -40,7 +41,8 @@ OR`), GlobalStore("meta", &Meta{}))
 }

 func TestExpected(t *testing.T) {
-	_, err := Parse("", []byte{}, Entrypoint("ConditionBoundaryExpr"), GlobalStore("meta", &Meta{}))
+	_, err := Parse("", []byte{}, Entrypoint("ConditionBoundaryExpr"),
+		GlobalStore("meta", &Meta{Schema: schema.NewMock(t)}))
 	expected := []string{`"InIfBoundary"i`, `"OutIfBoundary"i`}
 	if diff := helpers.Diff(Expected(err), expected); diff != "" {
 		t.Errorf("AllErrors() (-got, +want):\n%s", diff)
--- a/console/filter/helpers.go
+++ b/console/filter/helpers.go
@@ -14,14 +14,16 @@ import (

 // Meta is used to inject/retrieve state from the parser.
 type Meta struct {
+	// Schema is the data schema (used as input)
+	Schema *schema.Component
 	// ReverseDirection tells if we require the reverse direction for the provided filter (used as input)
 	ReverseDirection bool
 	// MainTableRequired tells if the main table is required to execute the expression (used as output)
 	MainTableRequired bool
 }

-// ReverseColumnDirection reverts the direction of a provided column name.
-func ReverseColumnDirection(name string) string {
+// reverseColumnDirection reverts the direction of a provided column name.
+func reverseColumnDirection(schema *schema.Component, name string) string {
 	var candidate string
 	if strings.HasPrefix(name, "Src") {
 		candidate = "Dst" + name[3:]
@@ -35,7 +37,7 @@ func ReverseColumnDirection(name string) string {
 	if strings.HasPrefix(name, "Out") {
 		candidate = "In" + name[3:]
 	}
-	if column, ok := schema.Flows.LookupColumnByName(candidate); ok {
+	if column, ok := schema.LookupColumnByName(candidate); ok {
 		return column.Name
 	}
 	return name
@@ -45,10 +47,11 @@ func ReverseColumnDirection(name string) string {
 // in predicate code blocks.
 func (c *current) acceptColumn() (string, error) {
 	name := string(c.text)
-	for _, column := range schema.Flows.Columns() {
+	schema := c.globalStore["meta"].(*Meta).Schema
+	for _, column := range schema.Columns() {
 		if strings.EqualFold(name, column.Name) {
 			if c.globalStore["meta"].(*Meta).ReverseDirection {
-				return ReverseColumnDirection(column.Name), nil
+				return reverseColumnDirection(schema, column.Name), nil
 			}
 			return column.Name, nil
 		}
@@ -60,7 +63,7 @@ func (c *current) acceptColumn() (string, error) {
 // in state change blocks. Unfortunately, it cannot extract matched text, so it
 // should be provided.
 func (c *current) metaColumn(name string) error {
-	if column, ok := schema.Flows.LookupColumnByName(name); ok {
+	if column, ok := c.globalStore["meta"].(*Meta).Schema.LookupColumnByName(name); ok {
 		if column.MainOnly {
 			c.state["main-table-only"] = true
 		}
--- a/console/filter/parser_test.go
+++ b/console/filter/parser_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"

 	"akvorado/common/helpers"
+	"akvorado/common/schema"
 )

 func TestValidFilter(t *testing.T) {
@@ -216,6 +217,8 @@ output provider */ = 'telia'`,
 		{Input: `DstCommunities != 65000:100:200`, Output: `NOT has(DstLargeCommunities, bitShiftLeft(65000::UInt128, 64) + bitShiftLeft(100::UInt128, 32) + 200::UInt128)`, MetaOut: Meta{MainTableRequired: true}},
 	}
 	for _, tc := range cases {
+		tc.MetaIn.Schema = schema.NewMock(t)
+		tc.MetaOut.Schema = tc.MetaIn.Schema
 		got, err := Parse("", []byte(tc.Input), GlobalStore("meta", &tc.MetaIn))
 		if err != nil {
 			t.Errorf("Parse(%q) error:\n%+v", tc.Input, err)
@@ -260,7 +263,7 @@ func TestInvalidFilter(t *testing.T) {
 		{`SrcAS IN (AS12322,`},
 	}
 	for _, tc := range cases {
-		out, err := Parse("", []byte(tc.Input), GlobalStore("meta", &Meta{}))
+		out, err := Parse("", []byte(tc.Input), GlobalStore("meta", &Meta{Schema: schema.NewMock(t)}))
 		t.Logf("out: %v", out)
 		if err == nil {
 			t.Errorf("Parse(%q) didn't throw an error", tc.Input)
--- a/console/graph.go
+++ b/console/graph.go
@@ -11,22 +11,25 @@ import (
 	"time"

 	"github.com/gin-gonic/gin"
+	"golang.org/x/exp/slices"

 	"akvorado/common/helpers"
 	"akvorado/common/schema"
+	"akvorado/console/query"
 )

 // graphHandlerInput describes the input for the /graph endpoint.
 type graphHandlerInput struct {
-	Start          time.Time     `json:"start" binding:"required"`
-	End            time.Time     `json:"end" binding:"required,gtfield=Start"`
-	Points         uint          `json:"points" binding:"required,min=5,max=2000"` // minimum number of points
-	Dimensions     []queryColumn `json:"dimensions"`                               // group by ...
-	Limit          int           `json:"limit" binding:"min=1"`                    // limit product of dimensions
-	Filter         queryFilter   `json:"filter"`                                   // where ...
-	Units          string        `json:"units" binding:"required,oneof=pps l2bps l3bps"`
-	Bidirectional  bool          `json:"bidirectional"`
-	PreviousPeriod bool          `json:"previous-period"`
+	schema         *schema.Component
+	Start          time.Time      `json:"start" binding:"required"`
+	End            time.Time      `json:"end" binding:"required,gtfield=Start"`
+	Points         uint           `json:"points" binding:"required,min=5,max=2000"` // minimum number of points
+	Dimensions     []query.Column `json:"dimensions"`                               // group by ...
+	Limit          int            `json:"limit" binding:"min=1"`                    // limit product of dimensions
+	Filter         query.Filter   `json:"filter"`                                   // where ...
+	Units          string         `json:"units" binding:"required,oneof=pps l2bps l3bps"`
+	Bidirectional  bool           `json:"bidirectional"`
+	PreviousPeriod bool           `json:"previous-period"`
 }

 // graphHandlerOutput describes the output for the /graph endpoint. A
@@ -45,14 +48,12 @@ type graphHandlerOutput struct {
 	NinetyFivePercentile []int          `json:"95th"`    // row → 95th xps
 }

-// reverseDirection reverts the direction of a provided input
+// reverseDirection reverts the direction of a provided input. It does not
+// modify the original.
 func (input graphHandlerInput) reverseDirection() graphHandlerInput {
-	input.Filter.Filter, input.Filter.ReverseFilter = input.Filter.ReverseFilter, input.Filter.Filter
-	dimensions := input.Dimensions
-	input.Dimensions = make([]queryColumn, len(dimensions))
-	for i := range dimensions {
-		input.Dimensions[i] = queryColumn(schema.Flows.ReverseColumnDirection(schema.ColumnKey(dimensions[i])))
-	}
+	input.Filter.Swap()
+	input.Dimensions = slices.Clone(input.Dimensions)
+	query.Columns(input.Dimensions).Reverse(input.schema)
 	return input
 }

@@ -82,7 +83,7 @@ func nearestPeriod(period time.Duration) (time.Duration, string) {
 // for less than 2-months, this is the month, otherwise, this is the
 // year. Also, dimensions are stripped.
 func (input graphHandlerInput) previousPeriod() graphHandlerInput {
-	input.Dimensions = []queryColumn{}
+	input.Dimensions = []query.Column{}
 	diff := input.End.Sub(input.Start)
 	period, _ := nearestPeriod(diff)
 	if period == 0 {
@@ -123,7 +124,7 @@ func (input graphHandlerInput) toSQL1(axis int, options toSQL1Options) string {
 	dimensionsInterpolate := ""
 	others := []string{}
 	for _, column := range input.Dimensions {
-		field := column.toSQLSelect()
+		field := column.ToSQLSelect()
 		selectFields = append(selectFields, field)
 		dimensions = append(dimensions, column.String())
 		others = append(others, "'Other'")
@@ -172,7 +173,7 @@ ORDER BY time WITH FILL
 			Start:             input.Start,
 			End:               input.End,
 			StartForInterval:  startForInterval,
-			MainTableRequired: requireMainTable(input.Dimensions, input.Filter),
+			MainTableRequired: requireMainTable(input.schema, input.Dimensions, input.Filter),
 			Points:            input.Points,
 			Units:             input.Units,
 		}),
@@ -207,11 +208,19 @@ func (input graphHandlerInput) toSQL() string {

 func (c *Component) graphHandlerFunc(gc *gin.Context) {
 	ctx := c.t.Context(gc.Request.Context())
-	var input graphHandlerInput
+	input := graphHandlerInput{schema: c.d.Schema}
 	if err := gc.ShouldBindJSON(&input); err != nil {
 		gc.JSON(http.StatusBadRequest, gin.H{"message": helpers.Capitalize(err.Error())})
 		return
 	}
+	if err := query.Columns(input.Dimensions).Validate(input.schema); err != nil {
+		gc.JSON(http.StatusBadRequest, gin.H{"message": helpers.Capitalize(err.Error())})
+		return
+	}
+	if err := input.Filter.Validate(input.schema); err != nil {
+		gc.JSON(http.StatusBadRequest, gin.H{"message": helpers.Capitalize(err.Error())})
+		return
+	}
 	if input.Limit > c.config.DimensionsLimit {
 		gc.JSON(http.StatusBadRequest,
 			gin.H{"message": fmt.Sprintf("Limit is set beyond maximum value (%d)",
--- a/console/graph_test.go
+++ b/console/graph_test.go
@@ -14,38 +14,36 @@ import (

 	"akvorado/common/helpers"
 	"akvorado/common/schema"
+	"akvorado/console/query"
 )

 func TestGraphInputReverseDirection(t *testing.T) {
 	input := graphHandlerInput{
+		schema: schema.NewMock(t),
 		Start:  time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 		End:    time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 		Points: 100,
-		Dimensions: []queryColumn{
-			queryColumn(schema.ColumnExporterName),
-			queryColumn(schema.ColumnInIfProvider),
+		Dimensions: query.Columns{
+			query.NewColumn("ExporterName"),
+			query.NewColumn("InIfProvider"),
 		},
-		Filter: queryFilter{
-			Filter:        "DstCountry = 'FR' AND SrcCountry = 'US'",
-			ReverseFilter: "SrcCountry = 'FR' AND DstCountry = 'US'",
-		},
-		Units: "l3bps",
+		Filter: query.NewFilter("DstCountry = 'FR' AND SrcCountry = 'US'"),
+		Units:  "l3bps",
 	}
 	original1 := fmt.Sprintf("%+v", input)
 	expected := graphHandlerInput{
 		Start:  time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 		End:    time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 		Points: 100,
-		Dimensions: []queryColumn{
-			queryColumn(schema.ColumnExporterName),
-			queryColumn(schema.ColumnOutIfProvider),
+		Dimensions: query.Columns{
+			query.NewColumn("ExporterName"),
+			query.NewColumn("OutIfProvider"),
 		},
-		Filter: queryFilter{
-			Filter:        "SrcCountry = 'FR' AND DstCountry = 'US'",
-			ReverseFilter: "DstCountry = 'FR' AND SrcCountry = 'US'",
-		},
-		Units: "l3bps",
+		Filter: query.NewFilter("SrcCountry = 'FR' AND DstCountry = 'US'"),
+		Units:  "l3bps",
 	}
+	query.Columns(input.Dimensions).Validate(input.schema)
+	query.Columns(expected.Dimensions).Validate(input.schema)
 	got := input.reverseDirection()
 	original2 := fmt.Sprintf("%+v", input)
 	if diff := helpers.Diff(got, expected); diff != "" {
@@ -118,18 +116,20 @@ func TestGraphPreviousPeriod(t *testing.T) {
 				t.Fatalf("time.Parse(%q) error:\n%+v", tc.ExpectedEnd, err)
 			}
 			input := graphHandlerInput{
-				Start: start,
-				End:   end,
-				Dimensions: []queryColumn{
-					queryColumn(schema.ColumnExporterAddress),
-					queryColumn(schema.ColumnExporterName),
+				schema: schema.NewMock(t),
+				Start:  start,
+				End:    end,
+				Dimensions: query.Columns{
+					query.NewColumn("ExporterAddress"),
+					query.NewColumn("ExporterName"),
 				},
 			}
+			query.Columns(input.Dimensions).Validate(input.schema)
 			got := input.previousPeriod()
 			expected := graphHandlerInput{
 				Start:      expectedStart,
 				End:        expectedEnd,
-				Dimensions: []queryColumn{},
+				Dimensions: []query.Column{},
 			}
 			if diff := helpers.Diff(got, expected); diff != "" {
 				t.Fatalf("previousPeriod() (-got, +want):\n%s", diff)
@@ -150,8 +150,8 @@ func TestGraphQuerySQL(t *testing.T) {
 				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points:     100,
-				Dimensions: []queryColumn{},
-				Filter:     queryFilter{},
+				Dimensions: []query.Column{},
+				Filter:     query.Filter{},
 				Units:      "l3bps",
 			},
 			Expected: `
@@ -176,8 +176,8 @@ ORDER BY time WITH FILL
 				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points:     100,
-				Dimensions: []queryColumn{},
-				Filter:     queryFilter{},
+				Dimensions: []query.Column{},
+				Filter:     query.Filter{},
 				Units:      "l2bps",
 			},
 			Expected: `
@@ -203,8 +203,8 @@ ORDER BY time WITH FILL
 				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points:     100,
-				Dimensions: []queryColumn{},
-				Filter:     queryFilter{},
+				Dimensions: []query.Column{},
+				Filter:     query.Filter{},
 				Units:      "pps",
 			},
 			Expected: `
@@ -229,8 +229,8 @@ ORDER BY time WITH FILL
 				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points:     100,
-				Dimensions: []queryColumn{},
-				Filter:     queryFilter{Filter: "DstCountry = 'FR' AND SrcCountry = 'US'"},
+				Dimensions: []query.Column{},
+				Filter:     query.NewFilter("DstCountry = 'FR' AND SrcCountry = 'US'"),
 				Units:      "l3bps",
 			},
 			Expected: `
@@ -255,8 +255,8 @@ ORDER BY time WITH FILL
 				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
 				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points:     100,
-				Dimensions: []queryColumn{},
-				Filter:     queryFilter{Filter: "InIfDescription = '{{ hello }}' AND SrcCountry = 'US'"},
+				Dimensions: []query.Column{},
+				Filter:     query.NewFilter("InIfDescription = '{{ hello }}' AND SrcCountry = 'US'"),
 				Units:      "l3bps",
 			},
 			Expected: `
@@ -278,14 +278,11 @@ ORDER BY time WITH FILL
 		}, {
 			Description: "no dimensions, reverse direction",
 			Input: graphHandlerInput{
-				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
-				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
-				Points:     100,
-				Dimensions: []queryColumn{},
-				Filter: queryFilter{
-					Filter:        "DstCountry = 'FR' AND SrcCountry = 'US'",
-					ReverseFilter: "SrcCountry = 'FR' AND DstCountry = 'US'",
-				},
+				Start:         time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
+				End:           time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
+				Points:        100,
+				Dimensions:    []query.Column{},
+				Filter:        query.NewFilter("DstCountry = 'FR' AND SrcCountry = 'US'"),
 				Units:         "l3bps",
 				Bidirectional: true,
 			},
@@ -328,11 +325,11 @@ ORDER BY time WITH FILL
 				End:    time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points: 100,
 				Limit:  20,
-				Dimensions: []queryColumn{
-					queryColumn(schema.ColumnExporterName),
-					queryColumn(schema.ColumnInIfProvider),
+				Dimensions: []query.Column{
+					query.NewColumn("ExporterName"),
+					query.NewColumn("InIfProvider"),
 				},
-				Filter: queryFilter{},
+				Filter: query.Filter{},
 				Units:  "l3bps",
 			},
 			Expected: `
@@ -360,11 +357,11 @@ ORDER BY time WITH FILL
 				End:    time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points: 100,
 				Limit:  20,
-				Dimensions: []queryColumn{
-					queryColumn(schema.ColumnExporterName),
-					queryColumn(schema.ColumnInIfProvider),
+				Dimensions: []query.Column{
+					query.NewColumn("ExporterName"),
+					query.NewColumn("InIfProvider"),
 				},
-				Filter:        queryFilter{},
+				Filter:        query.Filter{},
 				Units:         "l3bps",
 				Bidirectional: true,
 			},
@@ -409,11 +406,11 @@ ORDER BY time WITH FILL
 				End:    time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
 				Points: 100,
 				Limit:  20,
-				Dimensions: []queryColumn{
-					queryColumn(schema.ColumnExporterName),
-					queryColumn(schema.ColumnInIfProvider),
+				Dimensions: []query.Column{
+					query.NewColumn("ExporterName"),
+					query.NewColumn("InIfProvider"),
 				},
-				Filter:         queryFilter{},
+				Filter:         query.Filter{},
 				Units:          "l3bps",
 				PreviousPeriod: true,
 			},
@@ -454,6 +451,13 @@ ORDER BY time WITH FILL
 		},
 	}
 	for _, tc := range cases {
+		tc.Input.schema = schema.NewMock(t)
+		if err := query.Columns(tc.Input.Dimensions).Validate(tc.Input.schema); err != nil {
+			t.Fatalf("Validate() error:\n%+v", err)
+		}
+		if err := tc.Input.Filter.Validate(tc.Input.schema); err != nil {
+			t.Fatalf("Validate() error:\n%+v", err)
+		}
 		tc.Expected = strings.ReplaceAll(tc.Expected, "@@", "`")
 		t.Run(tc.Description, func(t *testing.T) {
 			got := tc.Input.toSQL()
--- a/console/query.go
+++ b/console/query.go
@@ -4,109 +4,28 @@
 package console

 import (
-	"errors"
-	"fmt"
 	"strings"

-	"akvorado/common/helpers"
 	"akvorado/common/schema"
-	"akvorado/console/filter"
+	"akvorado/console/query"
 )

-type queryColumn schema.ColumnKey
-
-func (qc queryColumn) MarshalText() ([]byte, error) {
-	return []byte(schema.ColumnKey(qc).String()), nil
-}
-func (qc queryColumn) String() string {
-	return schema.ColumnKey(qc).String()
-}
-func (qc *queryColumn) UnmarshalText(input []byte) error {
-	name := string(input)
-	if column, ok := schema.Flows.LookupColumnByName(name); ok && !column.ConsoleNotDimension {
-		*qc = queryColumn(column.Key)
-		return nil
-	}
-	return errors.New("unknown field")
-}
-
-func requireMainTable(qcs []queryColumn, qf queryFilter) bool {
-	if qf.MainTableRequired {
+func requireMainTable(sch *schema.Component, qcs []query.Column, qf query.Filter) bool {
+	if qf.MainTableRequired() {
 		return true
 	}
 	for _, qc := range qcs {
-		if column, ok := schema.Flows.LookupColumnByKey(schema.ColumnKey(qc)); ok && column.MainOnly {
+		if column, ok := sch.LookupColumnByKey(qc.Key()); ok && column.MainOnly {
 			return true
 		}
 	}
 	return false
 }

-type queryFilter struct {
-	Filter            string
-	ReverseFilter     string
-	MainTableRequired bool
-}
-
-func (qf queryFilter) String() string {
-	return qf.Filter
-}
-func (qf queryFilter) MarshalText() ([]byte, error) {
-	return []byte(qf.Filter), nil
-}
-func (qf *queryFilter) UnmarshalText(input []byte) error {
-	if strings.TrimSpace(string(input)) == "" {
-		*qf = queryFilter{}
-		return nil
-	}
-	meta := &filter.Meta{}
-	direct, err := filter.Parse("", input, filter.GlobalStore("meta", meta))
-	if err != nil {
-		return fmt.Errorf("cannot parse filter: %s", filter.HumanError(err))
-	}
-	meta = &filter.Meta{ReverseDirection: true}
-	reverse, err := filter.Parse("", input, filter.GlobalStore("meta", meta))
-	if err != nil {
-		return fmt.Errorf("cannot parse reverse filter: %s", filter.HumanError(err))
-	}
-	*qf = queryFilter{
-		Filter:            direct.(string),
-		ReverseFilter:     reverse.(string),
-		MainTableRequired: meta.MainTableRequired,
-	}
-	return nil
-}
-
-// toSQLSelect transforms a column into an expression to use in SELECT
-func (qc queryColumn) toSQLSelect() string {
-	var strValue string
-	switch schema.ColumnKey(qc) {
-	case schema.ColumnExporterAddress, schema.ColumnSrcAddr, schema.ColumnDstAddr:
-		strValue = fmt.Sprintf("replaceRegexpOne(IPv6NumToString(%s), '^::ffff:', '')", qc)
-	case schema.ColumnSrcAS, schema.ColumnDstAS, schema.ColumnDst1stAS, schema.ColumnDst2ndAS, schema.ColumnDst3rdAS:
-		strValue = fmt.Sprintf(`concat(toString(%s), ': ', dictGetOrDefault('asns', 'name', %s, '???'))`,
-			qc, qc)
-	case schema.ColumnEType:
-		strValue = fmt.Sprintf(`if(EType = %d, 'IPv4', if(EType = %d, 'IPv6', '???'))`,
-			helpers.ETypeIPv4, helpers.ETypeIPv6)
-	case schema.ColumnProto:
-		strValue = `dictGetOrDefault('protocols', 'name', Proto, '???')`
-	case schema.ColumnInIfSpeed, schema.ColumnOutIfSpeed, schema.ColumnSrcPort, schema.ColumnDstPort, schema.ColumnForwardingStatus, schema.ColumnInIfBoundary, schema.ColumnOutIfBoundary:
-		strValue = fmt.Sprintf("toString(%s)", qc)
-	case schema.ColumnDstASPath:
-		strValue = `arrayStringConcat(DstASPath, ' ')`
-	case schema.ColumnDstCommunities:
-		strValue = `arrayStringConcat(arrayConcat(arrayMap(c -> concat(toString(bitShiftRight(c, 16)), ':', toString(bitAnd(c, 0xffff))), DstCommunities), arrayMap(c -> concat(toString(bitAnd(bitShiftRight(c, 64), 0xffffffff)), ':', toString(bitAnd(bitShiftRight(c, 32), 0xffffffff)), ':', toString(bitAnd(c, 0xffffffff))), DstLargeCommunities)), ' ')`
-	default:
-		strValue = qc.String()
-	}
-	return strValue
-}
-
 // fixQueryColumnName fix capitalization of the provided column name
-func fixQueryColumnName(name string) string {
+func (c *Component) fixQueryColumnName(name string) string {
 	name = strings.ToLower(name)
-	for _, column := range schema.Flows.Columns() {
+	for _, column := range c.d.Schema.Columns() {
 		if strings.ToLower(column.Name) == name {
 			return column.Name
 		}
--- a/console/query/column.go
+++ b/console/query/column.go
@@ -0,0 +1,121 @@
+// SPDX-FileCopyrightText: 2023 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Package query provides query columns and query filters. These
+// types are special as they need a schema to be validated.
+package query
+
+import (
+	"fmt"
+
+	"akvorado/common/helpers"
+	"akvorado/common/schema"
+)
+
+// Column represents a query column. It should be instantiated with NewColumn() or
+// Unmarshal(), then call Validate().
+type Column struct {
+	validated bool
+	name      string
+	key       schema.ColumnKey
+}
+
+// Columns is a set of query columns.
+type Columns []Column
+
+// NewColumn creates a new column. Validate() should be called before using it.
+func NewColumn(name string) Column {
+	return Column{name: name}
+}
+
+func (qc Column) check() {
+	if !qc.validated {
+		panic("query column not validated")
+	}
+}
+
+func (qc Column) String() string {
+	return qc.name
+}
+
+// MarshalText turns a column into a string.
+func (qc Column) MarshalText() ([]byte, error) {
+	return []byte(qc.name), nil
+}
+
+// UnmarshalText parses a column. Validate() should be called before use.
+func (qc *Column) UnmarshalText(input []byte) error {
+	name := string(input)
+	*qc = Column{name: name}
+	return nil
+}
+
+// Key returns the key for the column.
+func (qc *Column) Key() schema.ColumnKey {
+	qc.check()
+	return qc.key
+}
+
+// Validate should be called before using the column. We need a schema component
+// for that.
+func (qc *Column) Validate(schema *schema.Component) error {
+	if column, ok := schema.LookupColumnByName(qc.name); ok && !column.ConsoleNotDimension {
+		qc.key = column.Key
+		qc.validated = true
+		return nil
+	}
+	return fmt.Errorf("unknown column name %s", qc.name)
+}
+
+// Reverse reverses the column direction
+func (qc *Column) Reverse(schema *schema.Component) {
+	name := schema.ReverseColumnDirection(qc.Key()).String()
+	reverted := Column{name: name}
+	if reverted.Validate(schema) == nil {
+		*qc = reverted
+	}
+	// No modification otherwise
+}
+
+// Reverse reverses the direction of all columns
+func (qcs Columns) Reverse(schema *schema.Component) {
+	for i := range qcs {
+		qcs[i].Reverse(schema)
+	}
+}
+
+// Validate call Validate on each column.
+func (qcs Columns) Validate(schema *schema.Component) error {
+	for i := range qcs {
+		if err := qcs[i].Validate(schema); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ToSQLSelect transforms a column into an expression to use in SELECT
+func (qc Column) ToSQLSelect() string {
+	var strValue string
+	switch qc.Key() {
+	case schema.ColumnExporterAddress, schema.ColumnSrcAddr, schema.ColumnDstAddr:
+		strValue = fmt.Sprintf("replaceRegexpOne(IPv6NumToString(%s), '^::ffff:', '')", qc)
+	case schema.ColumnSrcAS, schema.ColumnDstAS, schema.ColumnDst1stAS, schema.ColumnDst2ndAS, schema.ColumnDst3rdAS:
+		strValue = fmt.Sprintf(`concat(toString(%s), ': ', dictGetOrDefault('asns', 'name', %s, '???'))`,
+			qc, qc)
+	case schema.ColumnEType:
+		strValue = fmt.Sprintf(`if(EType = %d, 'IPv4', if(EType = %d, 'IPv6', '???'))`,
+			helpers.ETypeIPv4, helpers.ETypeIPv6)
+	case schema.ColumnProto:
+		strValue = `dictGetOrDefault('protocols', 'name', Proto, '???')`
+	case schema.ColumnInIfSpeed, schema.ColumnOutIfSpeed, schema.ColumnSrcPort, schema.ColumnDstPort, schema.ColumnForwardingStatus, schema.ColumnInIfBoundary, schema.ColumnOutIfBoundary:
+		strValue = fmt.Sprintf("toString(%s)", qc)
+	case schema.ColumnDstASPath:
+		strValue = `arrayStringConcat(DstASPath, ' ')`
+	case schema.ColumnDstCommunities:
+		strValue = `arrayStringConcat(arrayConcat(arrayMap(c -> concat(toString(bitShiftRight(c, 16)), ':', toString(bitAnd(c, 0xffff))), DstCommunities), arrayMap(c -> concat(toString(bitAnd(bitShiftRight(c, 64), 0xffffffff)), ':', toString(bitAnd(bitShiftRight(c, 32), 0xffffffff)), ':', toString(bitAnd(c, 0xffffffff))), DstLargeCommunities)), ' ')`
+	default:
+		strValue = qc.String()
+	}
+	return strValue
+}
--- a/console/query/column_test.go
+++ b/console/query/column_test.go
@@ -0,0 +1,119 @@
+// SPDX-FileCopyrightText: 2023 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package query_test
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"akvorado/common/helpers"
+	"akvorado/common/schema"
+	"akvorado/console/query"
+)
+
+func TestUnmarshalQueryColumn(t *testing.T) {
+	cases := []struct {
+		Input    string
+		Expected schema.ColumnKey
+		Error    bool
+	}{
+		{"DstAddr", schema.ColumnDstAddr, false},
+		{"TimeReceived", 0, true},
+		{"Nothing", 0, true},
+	}
+	for _, tc := range cases {
+		var qc query.Column
+		if err := qc.UnmarshalText([]byte(tc.Input)); err != nil {
+			t.Fatalf("UnmarshalText() error:\n%+v", err)
+		}
+		err := qc.Validate(schema.NewMock(t))
+		if err != nil && !tc.Error {
+			t.Fatalf("Validate(%q) error:\n%+v", tc.Input, err)
+		}
+		if err == nil && tc.Error {
+			t.Fatalf("Validate(%q) did not error", tc.Input)
+		}
+		if err != nil {
+			continue
+		}
+		if diff := helpers.Diff(qc.Key(), tc.Expected, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+			t.Fatalf("UnmarshalText(%q) (-got, +want):\n%s", tc.Input, diff)
+		}
+	}
+}
+
+func TestQueryColumnSQLSelect(t *testing.T) {
+	cases := []struct {
+		Input    schema.ColumnKey
+		Expected string
+	}{
+		{
+			Input:    schema.ColumnSrcAddr,
+			Expected: `replaceRegexpOne(IPv6NumToString(SrcAddr), '^::ffff:', '')`,
+		}, {
+			Input:    schema.ColumnDstAS,
+			Expected: `concat(toString(DstAS), ': ', dictGetOrDefault('asns', 'name', DstAS, '???'))`,
+		}, {
+			Input:    schema.ColumnDst2ndAS,
+			Expected: `concat(toString(Dst2ndAS), ': ', dictGetOrDefault('asns', 'name', Dst2ndAS, '???'))`,
+		}, {
+			Input:    schema.ColumnProto,
+			Expected: `dictGetOrDefault('protocols', 'name', Proto, '???')`,
+		}, {
+			Input:    schema.ColumnEType,
+			Expected: `if(EType = 2048, 'IPv4', if(EType = 34525, 'IPv6', '???'))`,
+		}, {
+			Input:    schema.ColumnOutIfSpeed,
+			Expected: `toString(OutIfSpeed)`,
+		}, {
+			Input:    schema.ColumnExporterName,
+			Expected: `ExporterName`,
+		}, {
+			Input:    schema.ColumnPacketSizeBucket,
+			Expected: `PacketSizeBucket`,
+		}, {
+			Input:    schema.ColumnDstASPath,
+			Expected: `arrayStringConcat(DstASPath, ' ')`,
+		}, {
+			Input:    schema.ColumnDstCommunities,
+			Expected: `arrayStringConcat(arrayConcat(arrayMap(c -> concat(toString(bitShiftRight(c, 16)), ':', toString(bitAnd(c, 0xffff))), DstCommunities), arrayMap(c -> concat(toString(bitAnd(bitShiftRight(c, 64), 0xffffffff)), ':', toString(bitAnd(bitShiftRight(c, 32), 0xffffffff)), ':', toString(bitAnd(c, 0xffffffff))), DstLargeCommunities)), ' ')`,
+		},
+	}
+	for _, tc := range cases {
+		t.Run(tc.Input.String(), func(t *testing.T) {
+			column := query.NewColumn(tc.Input.String())
+			if err := column.Validate(schema.NewMock(t)); err != nil {
+				t.Fatalf("Validate() error:\n%+v", err)
+			}
+			got := column.ToSQLSelect()
+			if diff := helpers.Diff(got, tc.Expected); diff != "" {
+				t.Errorf("toSQLWhere (-got, +want):\n%s", diff)
+			}
+		})
+	}
+}
+
+func TestReverseDirection(t *testing.T) {
+	columns := query.Columns{
+		query.NewColumn("SrcAS"),
+		query.NewColumn("DstAS"),
+		query.NewColumn("ExporterName"),
+		query.NewColumn("InIfProvider"),
+	}
+	sch := schema.NewMock(t)
+	if err := columns.Validate(sch); err != nil {
+		t.Fatalf("Validate() error:\n%+v", err)
+	}
+	columns.Reverse(sch)
+	expected := query.Columns{
+		query.NewColumn("DstAS"),
+		query.NewColumn("SrcAS"),
+		query.NewColumn("ExporterName"),
+		query.NewColumn("OutIfProvider"),
+	}
+	if diff := helpers.Diff(columns, expected, helpers.DiffFormatter(reflect.TypeOf(query.Column{}), fmt.Sprint)); diff != "" {
+		t.Fatalf("Reverse() (-got, +want):\n%s", diff)
+	}
+}
--- a/console/query/filter.go
+++ b/console/query/filter.go
@@ -0,0 +1,95 @@
+// SPDX-FileCopyrightText: 2023 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package query
+
+import (
+	"fmt"
+	"strings"
+
+	"akvorado/common/schema"
+	"akvorado/console/filter"
+)
+
+// Filter represents a query filter. It should be instantiated with NewFilter() and validated with Validate().
+type Filter struct {
+	validated         bool
+	filter            string
+	reverseFilter     string
+	mainTableRequired bool
+}
+
+// NewFilter creates a new filter. It should be validated with Validate() before use.
+func NewFilter(input string) Filter {
+	return Filter{filter: input}
+}
+
+func (qf Filter) check() {
+	if !qf.validated {
+		panic("query filter not validated")
+	}
+}
+
+func (qf Filter) String() string {
+	return qf.filter
+}
+
+// MarshalText turns a filter into a string.
+func (qf Filter) MarshalText() ([]byte, error) {
+	return []byte(qf.filter), nil
+}
+
+// UnmarshalText parses a filter. Validate() should be called before use.
+func (qf *Filter) UnmarshalText(input []byte) error {
+	*qf = Filter{
+		filter: strings.TrimSpace(string(input)),
+	}
+	return nil
+}
+
+// Validate validates a query filter with the provided schema.
+func (qf *Filter) Validate(sch *schema.Component) error {
+	if qf.filter == "" {
+		qf.validated = true
+		return nil
+	}
+	input := []byte(qf.filter)
+	meta := &filter.Meta{Schema: sch}
+	direct, err := filter.Parse("", input, filter.GlobalStore("meta", meta))
+	if err != nil {
+		return fmt.Errorf("cannot parse filter: %s", filter.HumanError(err))
+	}
+	meta = &filter.Meta{Schema: sch, ReverseDirection: true}
+	reverse, err := filter.Parse("", input, filter.GlobalStore("meta", meta))
+	if err != nil {
+		return fmt.Errorf("cannot parse reverse filter: %s", filter.HumanError(err))
+	}
+	qf.filter = direct.(string)
+	qf.reverseFilter = reverse.(string)
+	qf.mainTableRequired = meta.MainTableRequired
+	qf.validated = true
+	return nil
+}
+
+// MainTableRequired tells if the main table is required for this filter.
+func (qf Filter) MainTableRequired() bool {
+	qf.check()
+	return qf.mainTableRequired
+}
+
+// Reverse provides the reverse filter.
+func (qf Filter) Reverse() string {
+	qf.check()
+	return qf.reverseFilter
+}
+
+// Direct provides the filter.
+func (qf Filter) Direct() string {
+	qf.check()
+	return qf.filter
+}
+
+// Swap swap direct and reverse filter.
+func (qf *Filter) Swap() {
+	qf.filter, qf.reverseFilter = qf.reverseFilter, qf.filter
+}
--- a/console/query/filter_test.go
+++ b/console/query/filter_test.go
@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2023 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package query_test
+
+import (
+	"testing"
+
+	"akvorado/common/helpers"
+	"akvorado/common/schema"
+	"akvorado/console/query"
+)
+
+func TestUnmarshalFilter(t *testing.T) {
+	cases := []struct {
+		Input    string
+		Expected string
+		Error    bool
+	}{
+		{"", "", false},
+		{"   ", "", false},
+		{"SrcPort=12322", "SrcPort = 12322", false},
+		{"NoPort = 12322", "", true},
+	}
+	sch := schema.NewMock(t)
+	for _, tc := range cases {
+		t.Run(tc.Input, func(t *testing.T) {
+			var qf query.Filter
+			if err := qf.UnmarshalText([]byte(tc.Input)); err != nil {
+				t.Fatalf("UnmarshalText() error:\n%+v", err)
+			}
+			err := qf.Validate(sch)
+			if err != nil && !tc.Error {
+				t.Fatalf("Validate() error:\n%+v", err)
+			}
+			if err == nil && tc.Error {
+				t.Fatal("Validate() did not error")
+			}
+			if err != nil {
+				return
+			}
+			if diff := helpers.Diff(qf.Direct(), tc.Expected); diff != "" {
+				t.Fatalf("UnmarshalText(%q) (-got, +want):\n%s", tc.Input, diff)
+			}
+		})
+	}
+}
+
+func TestFilterSwap(t *testing.T) {
+	filter := query.NewFilter("SrcAS = 12322")
+	if err := filter.Validate(schema.NewMock(t)); err != nil {
+		t.Fatalf("Validate() error:\n%+v", err)
+	}
+	filter.Swap()
+	if diff := helpers.Diff(filter.Direct(), "DstAS = 12322"); diff != "" {
+		t.Fatalf("Swap() (-got, +want):\n%s", diff)
+	}
+	if diff := helpers.Diff(filter.Reverse(), "SrcAS = 12322"); diff != "" {
+		t.Fatalf("Swap() (-got, +want):\n%s", diff)
+	}
+}
--- a/console/query_test.go
+++ b/console/query_test.go
@@ -6,126 +6,38 @@ package console
 import (
 	"testing"

-	"akvorado/common/helpers"
 	"akvorado/common/schema"
+	"akvorado/console/query"
 )

 func TestRequireMainTable(t *testing.T) {
 	cases := []struct {
-		Columns  []queryColumn
-		Filter   queryFilter
+		Columns  []query.Column
+		Filter   query.Filter
 		Expected bool
 	}{
-		{[]queryColumn{}, queryFilter{}, false},
-		{[]queryColumn{queryColumn(schema.ColumnSrcAS)}, queryFilter{}, false},
-		{[]queryColumn{queryColumn(schema.ColumnExporterAddress)}, queryFilter{}, false},
-		{[]queryColumn{queryColumn(schema.ColumnSrcPort)}, queryFilter{}, true},
-		{[]queryColumn{queryColumn(schema.ColumnSrcAddr)}, queryFilter{}, true},
-		{[]queryColumn{queryColumn(schema.ColumnDstPort)}, queryFilter{}, true},
-		{[]queryColumn{queryColumn(schema.ColumnDstAddr)}, queryFilter{}, true},
-		{[]queryColumn{queryColumn(schema.ColumnSrcAS), queryColumn(schema.ColumnDstAddr)}, queryFilter{}, true},
-		{[]queryColumn{queryColumn(schema.ColumnDstAddr), queryColumn(schema.ColumnSrcAS)}, queryFilter{}, true},
-		{[]queryColumn{}, queryFilter{MainTableRequired: true}, true},
+		{[]query.Column{}, query.NewFilter(""), false},
+		{[]query.Column{query.NewColumn("SrcAS")}, query.NewFilter(""), false},
+		{[]query.Column{query.NewColumn("ExporterAddress")}, query.NewFilter(""), false},
+		{[]query.Column{query.NewColumn("SrcPort")}, query.NewFilter(""), true},
+		{[]query.Column{query.NewColumn("SrcAddr")}, query.NewFilter(""), true},
+		{[]query.Column{query.NewColumn("DstPort")}, query.NewFilter(""), true},
+		{[]query.Column{query.NewColumn("DstAddr")}, query.NewFilter(""), true},
+		{[]query.Column{query.NewColumn("SrcAS"), query.NewColumn("DstAddr")}, query.NewFilter(""), true},
+		{[]query.Column{query.NewColumn("DstAddr"), query.NewColumn("SrcAS")}, query.NewFilter(""), true},
+		{[]query.Column{}, query.NewFilter("SrcAddr = 203.0.113.15"), true},
 	}
+	sch := schema.NewMock(t)
 	for idx, tc := range cases {
-		got := requireMainTable(tc.Columns, tc.Filter)
+		if err := query.Columns(tc.Columns).Validate(sch); err != nil {
+			t.Fatalf("Validate() error:\n%+v", err)
+		}
+		if err := tc.Filter.Validate(sch); err != nil {
+			t.Fatalf("Validate() error:\n%+v", err)
+		}
+		got := requireMainTable(sch, tc.Columns, tc.Filter)
 		if got != tc.Expected {
 			t.Errorf("requireMainTable(%d) == %v but expected %v", idx, got, tc.Expected)
 		}
 	}
 }
-
-func TestUnmarshalQueryColumn(t *testing.T) {
-	cases := []struct {
-		Input    string
-		Expected schema.ColumnKey
-		Error    bool
-	}{
-		{"DstAddr", schema.ColumnDstAddr, false},
-		{"TimeReceived", 0, true},
-		{"Nothing", 0, true},
-	}
-	for _, tc := range cases {
-		var qc queryColumn
-		err := qc.UnmarshalText([]byte(tc.Input))
-		if err != nil && !tc.Error {
-			t.Fatalf("UnmarshalText(%q) error:\n%+v", tc.Input, err)
-		}
-		if err == nil && tc.Error {
-			t.Fatalf("UnmarshalText(%q) did not error", tc.Input)
-		}
-		if diff := helpers.Diff(qc, tc.Expected); diff != "" {
-			t.Fatalf("UnmarshalText(%q) (-got, +want):\n%s", tc.Input, diff)
-		}
-	}
-}
-
-func TestQueryColumnSQLSelect(t *testing.T) {
-	cases := []struct {
-		Input    schema.ColumnKey
-		Expected string
-	}{
-		{
-			Input:    schema.ColumnSrcAddr,
-			Expected: `replaceRegexpOne(IPv6NumToString(SrcAddr), '^::ffff:', '')`,
-		}, {
-			Input:    schema.ColumnDstAS,
-			Expected: `concat(toString(DstAS), ': ', dictGetOrDefault('asns', 'name', DstAS, '???'))`,
-		}, {
-			Input:    schema.ColumnDst2ndAS,
-			Expected: `concat(toString(Dst2ndAS), ': ', dictGetOrDefault('asns', 'name', Dst2ndAS, '???'))`,
-		}, {
-			Input:    schema.ColumnProto,
-			Expected: `dictGetOrDefault('protocols', 'name', Proto, '???')`,
-		}, {
-			Input:    schema.ColumnEType,
-			Expected: `if(EType = 2048, 'IPv4', if(EType = 34525, 'IPv6', '???'))`,
-		}, {
-			Input:    schema.ColumnOutIfSpeed,
-			Expected: `toString(OutIfSpeed)`,
-		}, {
-			Input:    schema.ColumnExporterName,
-			Expected: `ExporterName`,
-		}, {
-			Input:    schema.ColumnPacketSizeBucket,
-			Expected: `PacketSizeBucket`,
-		}, {
-			Input:    schema.ColumnDstASPath,
-			Expected: `arrayStringConcat(DstASPath, ' ')`,
-		}, {
-			Input:    schema.ColumnDstCommunities,
-			Expected: `arrayStringConcat(arrayConcat(arrayMap(c -> concat(toString(bitShiftRight(c, 16)), ':', toString(bitAnd(c, 0xffff))), DstCommunities), arrayMap(c -> concat(toString(bitAnd(bitShiftRight(c, 64), 0xffffffff)), ':', toString(bitAnd(bitShiftRight(c, 32), 0xffffffff)), ':', toString(bitAnd(c, 0xffffffff))), DstLargeCommunities)), ' ')`,
-		},
-	}
-	for _, tc := range cases {
-		t.Run(queryColumn(tc.Input).String(), func(t *testing.T) {
-			got := queryColumn(tc.Input).toSQLSelect()
-			if diff := helpers.Diff(got, tc.Expected); diff != "" {
-				t.Errorf("toSQLWhere (-got, +want):\n%s", diff)
-			}
-		})
-	}
-}
-
-func TestUnmarshalFilter(t *testing.T) {
-	cases := []struct {
-		Input    string
-		Expected string
-	}{
-		{"", ""},
-		{"   ", ""},
-		{"SrcPort=12322", "SrcPort = 12322"},
-	}
-	for _, tc := range cases {
-		t.Run(tc.Input, func(t *testing.T) {
-			var qf queryFilter
-			err := qf.UnmarshalText([]byte(tc.Input))
-			if err != nil {
-				t.Fatalf("UnmarshalText(%q) error:\n%+v", tc.Input, err)
-			}
-			if diff := helpers.Diff(qf.Filter, tc.Expected); diff != "" {
-				t.Fatalf("UnmarshalText(%q) (-got, +want):\n%s", tc.Input, diff)
-			}
-		})
-	}
-}
--- a/console/root.go
+++ b/console/root.go
@@ -21,8 +21,10 @@ import (
 	"akvorado/common/daemon"
 	"akvorado/common/http"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 	"akvorado/console/authentication"
 	"akvorado/console/database"
+	"akvorado/console/query"
 )

 // Component represents the console component.
@@ -48,6 +50,7 @@ type Dependencies struct {
 	Clock        clock.Clock
 	Auth         *authentication.Component
 	Database     *database.Component
+	Schema       *schema.Component
 }

 // New creates a new console component.
@@ -55,6 +58,9 @@ func New(r *reporter.Reporter, config Configuration, dependencies Dependencies)
 	if dependencies.Clock == nil {
 		dependencies.Clock = clock.New()
 	}
+	if err := query.Columns(config.DefaultVisualizeOptions.Dimensions).Validate(dependencies.Schema); err != nil {
+		return nil, err
+	}
 	c := Component{
 		r:           r,
 		d:           &dependencies,
--- a/console/sankey.go
+++ b/console/sankey.go
@@ -13,16 +13,19 @@ import (
 	"github.com/gin-gonic/gin"

 	"akvorado/common/helpers"
+	"akvorado/common/schema"
+	"akvorado/console/query"
 )

 // sankeyHandlerInput describes the input for the /sankey endpoint.
 type sankeyHandlerInput struct {
-	Start      time.Time     `json:"start" binding:"required"`
-	End        time.Time     `json:"end" binding:"required,gtfield=Start"`
-	Dimensions []queryColumn `json:"dimensions" binding:"required,min=2"` // group by ...
-	Limit      int           `json:"limit" binding:"min=1,max=50"`        // limit product of dimensions
-	Filter     queryFilter   `json:"filter"`                              // where ...
-	Units      string        `json:"units" binding:"required,oneof=pps l3bps l2bps"`
+	schema     *schema.Component
+	Start      time.Time      `json:"start" binding:"required"`
+	End        time.Time      `json:"end" binding:"required,gtfield=Start"`
+	Dimensions []query.Column `json:"dimensions" binding:"required,min=2"` // group by ...
+	Limit      int            `json:"limit" binding:"min=1,max=50"`        // limit product of dimensions
+	Filter     query.Filter   `json:"filter"`                              // where ...
+	Units      string         `json:"units" binding:"required,oneof=pps l3bps l2bps"`
 }

 // sankeyHandlerOutput describes the output for the /sankey endpoint.
@@ -51,7 +54,7 @@ func (input sankeyHandlerInput) toSQL() (string, error) {
 		arrayFields = append(arrayFields, fmt.Sprintf(`if(%s IN (SELECT %s FROM rows), %s, 'Other')`,
 			column.String(),
 			column.String(),
-			column.toSQLSelect()))
+			column.ToSQLSelect()))
 		dimensions = append(dimensions, column.String())
 	}
 	fields := []string{
@@ -84,7 +87,7 @@ ORDER BY xps DESC
 		templateContext(inputContext{
 			Start:             input.Start,
 			End:               input.End,
-			MainTableRequired: requireMainTable(input.Dimensions, input.Filter),
+			MainTableRequired: requireMainTable(input.schema, input.Dimensions, input.Filter),
 			Points:            20,
 			Units:             input.Units,
 		}),
@@ -94,11 +97,19 @@ ORDER BY xps DESC

 func (c *Component) sankeyHandlerFunc(gc *gin.Context) {
 	ctx := c.t.Context(gc.Request.Context())
-	var input sankeyHandlerInput
+	input := sankeyHandlerInput{schema: c.d.Schema}
 	if err := gc.ShouldBindJSON(&input); err != nil {
 		gc.JSON(http.StatusBadRequest, gin.H{"message": helpers.Capitalize(err.Error())})
 		return
 	}
+	if err := query.Columns(input.Dimensions).Validate(input.schema); err != nil {
+		gc.JSON(http.StatusBadRequest, gin.H{"message": helpers.Capitalize(err.Error())})
+		return
+	}
+	if err := input.Filter.Validate(input.schema); err != nil {
+		gc.JSON(http.StatusBadRequest, gin.H{"message": helpers.Capitalize(err.Error())})
+		return
+	}

 	sqlQuery, err := input.toSQL()
 	if err != nil {
--- a/console/sankey_test.go
+++ b/console/sankey_test.go
@@ -13,6 +13,7 @@ import (

 	"akvorado/common/helpers"
 	"akvorado/common/schema"
+	"akvorado/console/query"
 )

 func TestSankeyQuerySQL(t *testing.T) {
@@ -24,12 +25,14 @@ func TestSankeyQuerySQL(t *testing.T) {
 		{
 			Description: "two dimensions, no filters, l3 bps",
 			Input: sankeyHandlerInput{
-				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
-				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
-				Dimensions: []queryColumn{queryColumn(schema.ColumnSrcAS), queryColumn(schema.ColumnExporterName)},
-				Limit:      5,
-				Filter:     queryFilter{},
-				Units:      "l3bps",
+				Start: time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
+				End:   time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
+				Dimensions: []query.Column{
+					query.NewColumn("SrcAS"),
+					query.NewColumn("ExporterName")},
+				Limit:  5,
+				Filter: query.Filter{},
+				Units:  "l3bps",
 			},
 			Expected: `
 {{ with context @@{"start":"2022-04-10T15:45:10Z","end":"2022-04-11T15:45:10Z","points":20,"units":"l3bps"}@@ }}
@@ -48,12 +51,14 @@ ORDER BY xps DESC
 		}, {
 			Description: "two dimensions, no filters, l2 bps",
 			Input: sankeyHandlerInput{
-				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
-				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
-				Dimensions: []queryColumn{queryColumn(schema.ColumnSrcAS), queryColumn(schema.ColumnExporterName)},
-				Limit:      5,
-				Filter:     queryFilter{},
-				Units:      "l2bps",
+				Start: time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
+				End:   time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
+				Dimensions: []query.Column{
+					query.NewColumn("SrcAS"),
+					query.NewColumn("ExporterName")},
+				Limit:  5,
+				Filter: query.Filter{},
+				Units:  "l2bps",
 			},
 			Expected: `
 {{ with context @@{"start":"2022-04-10T15:45:10Z","end":"2022-04-11T15:45:10Z","points":20,"units":"l2bps"}@@ }}
@@ -73,12 +78,14 @@ ORDER BY xps DESC
 		}, {
 			Description: "two dimensions, no filters, pps",
 			Input: sankeyHandlerInput{
-				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
-				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
-				Dimensions: []queryColumn{queryColumn(schema.ColumnSrcAS), queryColumn(schema.ColumnExporterName)},
-				Limit:      5,
-				Filter:     queryFilter{},
-				Units:      "pps",
+				Start: time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
+				End:   time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
+				Dimensions: []query.Column{
+					query.NewColumn("SrcAS"),
+					query.NewColumn("ExporterName")},
+				Limit:  5,
+				Filter: query.Filter{},
+				Units:  "pps",
 			},
 			Expected: `
 {{ with context @@{"start":"2022-04-10T15:45:10Z","end":"2022-04-11T15:45:10Z","points":20,"units":"pps"}@@ }}
@@ -97,12 +104,14 @@ ORDER BY xps DESC
 		}, {
 			Description: "two dimensions, with filter",
 			Input: sankeyHandlerInput{
-				Start:      time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
-				End:        time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
-				Dimensions: []queryColumn{queryColumn(schema.ColumnSrcAS), queryColumn(schema.ColumnExporterName)},
-				Limit:      10,
-				Filter:     queryFilter{Filter: "DstCountry = 'FR'"},
-				Units:      "l3bps",
+				Start: time.Date(2022, 04, 10, 15, 45, 10, 0, time.UTC),
+				End:   time.Date(2022, 04, 11, 15, 45, 10, 0, time.UTC),
+				Dimensions: []query.Column{
+					query.NewColumn("SrcAS"),
+					query.NewColumn("ExporterName")},
+				Limit:  10,
+				Filter: query.NewFilter("DstCountry = 'FR'"),
+				Units:  "l3bps",
 			},
 			Expected: `
 {{ with context @@{"start":"2022-04-10T15:45:10Z","end":"2022-04-11T15:45:10Z","points":20,"units":"l3bps"}@@ }}
@@ -121,6 +130,13 @@ ORDER BY xps DESC
 		},
 	}
 	for _, tc := range cases {
+		tc.Input.schema = schema.NewMock(t)
+		if err := query.Columns(tc.Input.Dimensions).Validate(tc.Input.schema); err != nil {
+			t.Fatalf("Validate() error:\n%+v", err)
+		}
+		if err := tc.Input.Filter.Validate(tc.Input.schema); err != nil {
+			t.Fatalf("Validate() error:\n%+v", err)
+		}
 		tc.Expected = strings.ReplaceAll(tc.Expected, "@@", "`")
 		t.Run(tc.Description, func(t *testing.T) {
 			got, _ := tc.Input.toSQL()
--- a/console/tests.go
+++ b/console/tests.go
@@ -16,6 +16,7 @@ import (
 	"akvorado/common/helpers"
 	"akvorado/common/http"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 	"akvorado/console/authentication"
 	"akvorado/console/database"
 )
@@ -34,6 +35,7 @@ func NewMock(t *testing.T, config Configuration) (*Component, *http.Component, *
 		Clock:        mockClock,
 		Auth:         authentication.NewMock(t, r),
 		Database:     database.NewMock(t, r, database.DefaultConfiguration()),
+		Schema:       schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
--- a/demoexporter/flows/nfdata_test.go
+++ b/demoexporter/flows/nfdata_test.go
@@ -19,7 +19,7 @@ import (

 func TestGetNetflowData(t *testing.T) {
 	r := reporter.NewMock(t)
-	nfdecoder := netflow.New(r)
+	nfdecoder := netflow.New(r, decoder.Dependencies{Schema: schema.NewMock(t)})

 	ch := getNetflowTemplates(
 		context.Background(),
--- a/inlet/core/enricher.go
+++ b/inlet/core/enricher.go
@@ -98,30 +98,30 @@ func (c *Component) enrichFlow(exporterIP netip.Addr, exporterStr string, flow *
 	destBMP := c.d.BMP.Lookup(flow.DstAddr, flow.NextHop)
 	flow.SrcAS = c.getASNumber(flow.SrcAddr, flow.SrcAS, sourceBMP.ASN)
 	flow.DstAS = c.getASNumber(flow.DstAddr, flow.DstAS, destBMP.ASN)
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnSrcCountry, []byte(c.d.GeoIP.LookupCountry(flow.SrcAddr)))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnDstCountry, []byte(c.d.GeoIP.LookupCountry(flow.DstAddr)))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnSrcCountry, []byte(c.d.GeoIP.LookupCountry(flow.SrcAddr)))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnDstCountry, []byte(c.d.GeoIP.LookupCountry(flow.DstAddr)))
 	for _, comm := range destBMP.Communities {
-		schema.Flows.ProtobufAppendVarint(flow, schema.ColumnDstCommunities, uint64(comm))
+		c.d.Schema.ProtobufAppendVarint(flow, schema.ColumnDstCommunities, uint64(comm))
 	}
 	for _, asn := range destBMP.ASPath {
-		schema.Flows.ProtobufAppendVarint(flow, schema.ColumnDstASPath, uint64(asn))
+		c.d.Schema.ProtobufAppendVarint(flow, schema.ColumnDstASPath, uint64(asn))
 	}
 	for _, comm := range destBMP.LargeCommunities {
-		schema.Flows.ProtobufAppendVarintForce(flow,
+		c.d.Schema.ProtobufAppendVarintForce(flow,
 			schema.ColumnDstLargeCommunitiesASN, uint64(comm.ASN))
-		schema.Flows.ProtobufAppendVarintForce(flow,
+		c.d.Schema.ProtobufAppendVarintForce(flow,
 			schema.ColumnDstLargeCommunitiesLocalData1, uint64(comm.LocalData1))
-		schema.Flows.ProtobufAppendVarintForce(flow,
+		c.d.Schema.ProtobufAppendVarintForce(flow,
 			schema.ColumnDstLargeCommunitiesLocalData2, uint64(comm.LocalData2))
 	}

-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnExporterName, []byte(flowExporterName))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnInIfName, []byte(flowInIfName))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnInIfDescription, []byte(flowInIfDescription))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnOutIfName, []byte(flowOutIfName))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnOutIfDescription, []byte(flowOutIfDescription))
-	schema.Flows.ProtobufAppendVarint(flow, schema.ColumnInIfSpeed, uint64(flowInIfSpeed))
-	schema.Flows.ProtobufAppendVarint(flow, schema.ColumnOutIfSpeed, uint64(flowOutIfSpeed))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnExporterName, []byte(flowExporterName))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnInIfName, []byte(flowInIfName))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnInIfDescription, []byte(flowInIfDescription))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnOutIfName, []byte(flowOutIfName))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnOutIfDescription, []byte(flowOutIfDescription))
+	c.d.Schema.ProtobufAppendVarint(flow, schema.ColumnInIfSpeed, uint64(flowInIfSpeed))
+	c.d.Schema.ProtobufAppendVarint(flow, schema.ColumnOutIfSpeed, uint64(flowOutIfSpeed))

 	return
 }
@@ -154,12 +154,12 @@ func (c *Component) getASNumber(flowAddr netip.Addr, flowAS, bmpAS uint32) (asn
 	return asn
 }

-func writeExporter(flow *schema.FlowMessage, classification exporterClassification) {
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnExporterGroup, []byte(classification.Group))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnExporterRole, []byte(classification.Role))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnExporterSite, []byte(classification.Site))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnExporterRegion, []byte(classification.Region))
-	schema.Flows.ProtobufAppendBytes(flow, schema.ColumnExporterTenant, []byte(classification.Tenant))
+func (c *Component) writeExporter(flow *schema.FlowMessage, classification exporterClassification) {
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnExporterGroup, []byte(classification.Group))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnExporterRole, []byte(classification.Role))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnExporterSite, []byte(classification.Site))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnExporterRegion, []byte(classification.Region))
+	c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnExporterTenant, []byte(classification.Tenant))
 }

 func (c *Component) classifyExporter(ip string, name string, flow *schema.FlowMessage) {
@@ -168,7 +168,7 @@ func (c *Component) classifyExporter(ip string, name string, flow *schema.FlowMe
 	}
 	si := exporterInfo{IP: ip, Name: name}
 	if classification, ok := c.classifierExporterCache.Get(si); ok {
-		writeExporter(flow, classification)
+		c.writeExporter(flow, classification)
 		return
 	}

@@ -190,18 +190,18 @@ func (c *Component) classifyExporter(ip string, name string, flow *schema.FlowMe
 		break
 	}
 	c.classifierExporterCache.Set(si, classification)
-	writeExporter(flow, classification)
+	c.writeExporter(flow, classification)
 }

-func writeInterface(flow *schema.FlowMessage, classification interfaceClassification, directionIn bool) {
+func (c *Component) writeInterface(flow *schema.FlowMessage, classification interfaceClassification, directionIn bool) {
 	if directionIn {
-		schema.Flows.ProtobufAppendBytes(flow, schema.ColumnInIfConnectivity, []byte(classification.Connectivity))
-		schema.Flows.ProtobufAppendBytes(flow, schema.ColumnInIfProvider, []byte(classification.Provider))
-		schema.Flows.ProtobufAppendVarint(flow, schema.ColumnInIfBoundary, uint64(classification.Boundary))
+		c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnInIfConnectivity, []byte(classification.Connectivity))
+		c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnInIfProvider, []byte(classification.Provider))
+		c.d.Schema.ProtobufAppendVarint(flow, schema.ColumnInIfBoundary, uint64(classification.Boundary))
 	} else {
-		schema.Flows.ProtobufAppendBytes(flow, schema.ColumnOutIfConnectivity, []byte(classification.Connectivity))
-		schema.Flows.ProtobufAppendBytes(flow, schema.ColumnOutIfProvider, []byte(classification.Provider))
-		schema.Flows.ProtobufAppendVarint(flow, schema.ColumnOutIfBoundary, uint64(classification.Boundary))
+		c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnOutIfConnectivity, []byte(classification.Connectivity))
+		c.d.Schema.ProtobufAppendBytes(flow, schema.ColumnOutIfProvider, []byte(classification.Provider))
+		c.d.Schema.ProtobufAppendVarint(flow, schema.ColumnOutIfBoundary, uint64(classification.Boundary))
 	}
 }

@@ -216,7 +216,7 @@ func (c *Component) classifyInterface(ip string, exporterName string, fl *schema
 		Interface: ii,
 	}
 	if classification, ok := c.classifierInterfaceCache.Get(key); ok {
-		writeInterface(fl, classification, directionIn)
+		c.writeInterface(fl, classification, directionIn)
 		return
 	}

@@ -243,7 +243,7 @@ func (c *Component) classifyInterface(ip string, exporterName string, fl *schema
 		break
 	}
 	c.classifierInterfaceCache.Set(key, classification)
-	writeInterface(fl, classification, directionIn)
+	c.writeInterface(fl, classification, directionIn)
 }

 func isPrivateAS(as uint32) bool {
--- a/inlet/core/enricher_test.go
+++ b/inlet/core/enricher_test.go
@@ -6,7 +6,6 @@ package core
 import (
 	"fmt"
 	"net/netip"
-	"reflect"
 	"testing"
 	"time"

@@ -372,6 +371,7 @@ ClassifyProviderRegex(Interface.Description, "^Transit: ([^ ]+)", "$1")`,
 				Kafka:  kafkaComponent,
 				HTTP:   httpComponent,
 				BMP:    bmpComponent,
+				Schema: schema.NewMock(t),
 			})
 			if err != nil {
 				t.Fatalf("New() error:\n%+v", err)
@@ -388,8 +388,8 @@ ClassifyProviderRegex(Interface.Description, "^Transit: ([^ ]+)", "$1")`,
 						t.Fatalf("Kafka message encoding error:\n%+v", err)
 					}
 					t.Logf("Raw message: %v", b)
-					got := schema.Flows.ProtobufDecode(t, b)
-					if diff := helpers.Diff(&got, tc.OutputFlow, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+					got := c.d.Schema.ProtobufDecode(t, b)
+					if diff := helpers.Diff(&got, tc.OutputFlow); diff != "" {
 						t.Errorf("Classifier (-got, +want):\n%s", diff)
 					}
 					return nil
@@ -461,6 +461,7 @@ func TestGetASNumber(t *testing.T) {
 				Daemon: daemon.NewMock(t),
 				GeoIP:  geoip.NewMock(t, r),
 				BMP:    bmpComponent,
+				Schema: schema.NewMock(t),
 			})
 			if err != nil {
 				t.Fatalf("New() error:\n%+v", err)
--- a/inlet/core/root.go
+++ b/inlet/core/root.go
@@ -51,6 +51,7 @@ type Dependencies struct {
 	GeoIP  *geoip.Component
 	Kafka  *kafka.Component
 	HTTP   *http.Component
+	Schema *schema.Component
 }

 // New creates a new core component.
@@ -119,7 +120,7 @@ func (c *Component) runWorker(workerID int) error {
 			}

 			// Serialize flow to Protobuf
-			buf := schema.Flows.ProtobufMarshal(flow)
+			buf := c.d.Schema.ProtobufMarshal(flow)
 			c.metrics.flowsProcessingTime.Observe(time.Now().Sub(start).Seconds())

 			// Forward to Kafka. This could block and buf is now owned by the
--- a/inlet/core/root_test.go
+++ b/inlet/core/root_test.go
@@ -53,6 +53,7 @@ func TestCore(t *testing.T) {
 		Kafka:  kafkaComponent,
 		HTTP:   httpComponent,
 		BMP:    bmpComponent,
+		Schema: schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
--- a/inlet/flow/decoder/netflow/decode.go
+++ b/inlet/flow/decoder/netflow/decode.go
@@ -15,7 +15,7 @@ import (
 	"github.com/netsampler/goflow2/producer"
 )

-func decode(msgDec interface{}, samplingRateSys producer.SamplingRateSystem) []*schema.FlowMessage {
+func (nd *Decoder) decode(msgDec interface{}, samplingRateSys producer.SamplingRateSystem) []*schema.FlowMessage {
 	flowMessageSet := []*schema.FlowMessage{}
 	var obsDomainID uint32
 	var dataFlowSet []netflow.DataFlowSet
@@ -47,7 +47,7 @@ func decode(msgDec interface{}, samplingRateSys producer.SamplingRateSystem) []*
 	// Parse fields
 	for _, dataFlowSetItem := range dataFlowSet {
 		for _, record := range dataFlowSetItem.Records {
-			flow := decodeRecord(version, record.Values)
+			flow := nd.decodeRecord(version, record.Values)
 			if flow != nil {
 				flow.SamplingRate = samplingRate
 				flowMessageSet = append(flowMessageSet, flow)
@@ -58,7 +58,7 @@ func decode(msgDec interface{}, samplingRateSys producer.SamplingRateSystem) []*
 	return flowMessageSet
 }

-func decodeRecord(version int, fields []netflow.DataField) *schema.FlowMessage {
+func (nd *Decoder) decodeRecord(version int, fields []netflow.DataField) *schema.FlowMessage {
 	var etype uint16
 	bf := &schema.FlowMessage{}
 	for _, field := range fields {
@@ -73,9 +73,9 @@ func decodeRecord(version int, fields []netflow.DataField) *schema.FlowMessage {
 		switch field.Type {
 		// Statistics
 		case netflow.NFV9_FIELD_IN_BYTES, netflow.NFV9_FIELD_OUT_BYTES:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnBytes, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnBytes, decodeUNumber(v))
 		case netflow.NFV9_FIELD_IN_PKTS, netflow.NFV9_FIELD_OUT_PKTS:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnPackets, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnPackets, decodeUNumber(v))

 		// L3
 		case netflow.NFV9_FIELD_IPV4_SRC_ADDR:
@@ -91,19 +91,19 @@ func decodeRecord(version int, fields []netflow.DataField) *schema.FlowMessage {
 			etype = helpers.ETypeIPv6
 			bf.DstAddr = decodeIP(v)
 		case netflow.NFV9_FIELD_SRC_MASK, netflow.NFV9_FIELD_IPV6_SRC_MASK:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnSrcNetMask, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnSrcNetMask, decodeUNumber(v))
 		case netflow.NFV9_FIELD_DST_MASK, netflow.NFV9_FIELD_IPV6_DST_MASK:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnDstNetMask, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnDstNetMask, decodeUNumber(v))
 		case netflow.NFV9_FIELD_IPV4_NEXT_HOP, netflow.NFV9_FIELD_BGP_IPV4_NEXT_HOP, netflow.NFV9_FIELD_IPV6_NEXT_HOP, netflow.NFV9_FIELD_BGP_IPV6_NEXT_HOP:
 			bf.NextHop = decodeIP(v)

 		// L4
 		case netflow.NFV9_FIELD_L4_SRC_PORT:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnSrcPort, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnSrcPort, decodeUNumber(v))
 		case netflow.NFV9_FIELD_L4_DST_PORT:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnDstPort, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnDstPort, decodeUNumber(v))
 		case netflow.NFV9_FIELD_PROTOCOL:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnProto, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnProto, decodeUNumber(v))

 		// Network
 		case netflow.NFV9_FIELD_SRC_AS:
@@ -119,10 +119,10 @@ func decodeRecord(version int, fields []netflow.DataField) *schema.FlowMessage {

 		// Remaining
 		case netflow.NFV9_FIELD_FORWARDING_STATUS:
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnForwardingStatus, decodeUNumber(v))
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnForwardingStatus, decodeUNumber(v))
 		}
 	}
-	schema.Flows.ProtobufAppendVarint(bf, schema.ColumnEType, uint64(etype))
+	nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnEType, uint64(etype))
 	return bf
 }

--- a/inlet/flow/decoder/netflow/root.go
+++ b/inlet/flow/decoder/netflow/root.go
@@ -21,6 +21,7 @@ import (
 // Decoder contains the state for the Netflow v9 decoder.
 type Decoder struct {
 	r *reporter.Reporter
+	d decoder.Dependencies

 	// Templates and sampling systems
 	systemsLock sync.RWMutex
@@ -37,9 +38,10 @@ type Decoder struct {
 }

 // New instantiates a new netflow decoder.
-func New(r *reporter.Reporter) decoder.Decoder {
+func New(r *reporter.Reporter, dependencies decoder.Dependencies) decoder.Decoder {
 	nd := &Decoder{
 		r:         r,
+		d:         dependencies,
 		templates: map[string]*templateSystem{},
 		sampling:  map[string]producer.SamplingRateSystem{},
 	}
@@ -208,7 +210,7 @@ func (nd *Decoder) Decode(in decoder.RawFlow) []*schema.FlowMessage {
 		}
 	}

-	flowMessageSet := decode(msgDec, sampling)
+	flowMessageSet := nd.decode(msgDec, sampling)
 	exporterAddress, _ := netip.AddrFromSlice(in.Source.To16())
 	for _, fmsg := range flowMessageSet {
 		fmsg.TimeReceived = ts
--- a/inlet/flow/decoder/netflow/root_test.go
+++ b/inlet/flow/decoder/netflow/root_test.go
@@ -4,11 +4,9 @@
 package netflow

 import (
-	"fmt"
 	"net"
 	"net/netip"
 	"path/filepath"
-	"reflect"
 	"testing"

 	"akvorado/common/helpers"
@@ -19,7 +17,7 @@ import (

 func TestDecode(t *testing.T) {
 	r := reporter.NewMock(t)
-	nfdecoder := New(r)
+	nfdecoder := New(r, decoder.Dependencies{Schema: schema.NewMock(t)})

 	// Send an option template
 	template := helpers.ReadPcapPayload(t, filepath.Join("testdata", "options-template-257.pcap"))
@@ -183,7 +181,7 @@ func TestDecode(t *testing.T) {
 		f.TimeReceived = 0
 	}

-	if diff := helpers.Diff(got, expectedFlows, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+	if diff := helpers.Diff(got, expectedFlows); diff != "" {
 		t.Fatalf("Decode() (-got, +want):\n%s", diff)
 	}
 	gotMetrics = r.GetMetrics(
--- a/inlet/flow/decoder/root.go
+++ b/inlet/flow/decoder/root.go
@@ -24,6 +24,11 @@ type Decoder interface {
 	Name() string
 }

+// Dependencies are the dependencies for the decoder
+type Dependencies struct {
+	Schema *schema.Component
+}
+
 // RawFlow is an undecoded flow.
 type RawFlow struct {
 	TimeReceived time.Time
@@ -32,4 +37,4 @@ type RawFlow struct {
 }

 // NewDecoderFunc is the signature of a function to instantiate a decoder.
-type NewDecoderFunc func(*reporter.Reporter) Decoder
+type NewDecoderFunc func(*reporter.Reporter, Dependencies) Decoder
--- a/inlet/flow/decoder/sflow/decode.go
+++ b/inlet/flow/decoder/sflow/decode.go
@@ -14,7 +14,7 @@ import (
 	"github.com/netsampler/goflow2/decoders/sflow"
 )

-func decode(msgDec interface{}) []*schema.FlowMessage {
+func (nd *Decoder) decode(msgDec interface{}) []*schema.FlowMessage {
 	flowMessageSet := []*schema.FlowMessage{}
 	switch msgDec.(type) {
 	case sflow.Packet:
@@ -54,33 +54,33 @@ func decode(msgDec interface{}) []*schema.FlowMessage {
 		}

 		bf.ExporterAddress = decodeIP(packet.AgentIP)
-		schema.Flows.ProtobufAppendVarint(bf, schema.ColumnPackets, 1)
-		schema.Flows.ProtobufAppendVarint(bf, schema.ColumnForwardingStatus, uint64(forwardingStatus))
+		nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnPackets, 1)
+		nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnForwardingStatus, uint64(forwardingStatus))

 		for _, record := range records {
 			switch recordData := record.Data.(type) {
 			case sflow.SampledHeader:
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnBytes, uint64(recordData.FrameLength))
-				parseSampledHeader(bf, &recordData)
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnBytes, uint64(recordData.FrameLength))
+				nd.parseSampledHeader(bf, &recordData)
 			case sflow.SampledIPv4:
 				bf.SrcAddr = decodeIP(recordData.Base.SrcIP)
 				bf.DstAddr = decodeIP(recordData.Base.DstIP)
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnBytes, uint64(recordData.Base.Length))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnProto, uint64(recordData.Base.Protocol))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnSrcPort, uint64(recordData.Base.SrcPort))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnDstPort, uint64(recordData.Base.DstPort))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv4)
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnBytes, uint64(recordData.Base.Length))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnProto, uint64(recordData.Base.Protocol))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnSrcPort, uint64(recordData.Base.SrcPort))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnDstPort, uint64(recordData.Base.DstPort))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv4)
 			case sflow.SampledIPv6:
 				bf.SrcAddr = decodeIP(recordData.Base.SrcIP)
 				bf.DstAddr = decodeIP(recordData.Base.DstIP)
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnBytes, uint64(recordData.Base.Length))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnProto, uint64(recordData.Base.Protocol))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnSrcPort, uint64(recordData.Base.SrcPort))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnDstPort, uint64(recordData.Base.DstPort))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv6)
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnBytes, uint64(recordData.Base.Length))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnProto, uint64(recordData.Base.Protocol))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnSrcPort, uint64(recordData.Base.SrcPort))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnDstPort, uint64(recordData.Base.DstPort))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv6)
 			case sflow.ExtendedRouter:
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnSrcNetMask, uint64(recordData.SrcMaskLen))
-				schema.Flows.ProtobufAppendVarint(bf, schema.ColumnDstNetMask, uint64(recordData.DstMaskLen))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnSrcNetMask, uint64(recordData.SrcMaskLen))
+				nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnDstNetMask, uint64(recordData.DstMaskLen))
 				bf.NextHop = decodeIP(recordData.NextHop)
 			case sflow.ExtendedGateway:
 				bf.NextHop = decodeIP(recordData.NextHop)
@@ -101,15 +101,15 @@ func decode(msgDec interface{}) []*schema.FlowMessage {
 	return flowMessageSet
 }

-func parseSampledHeader(bf *schema.FlowMessage, header *sflow.SampledHeader) {
+func (nd *Decoder) parseSampledHeader(bf *schema.FlowMessage, header *sflow.SampledHeader) {
 	data := header.HeaderData
 	switch header.Protocol {
 	case 1: // Ethernet
-		parseEthernetHeader(bf, data)
+		nd.parseEthernetHeader(bf, data)
 	}
 }

-func parseEthernetHeader(bf *schema.FlowMessage, data []byte) {
+func (nd *Decoder) parseEthernetHeader(bf *schema.FlowMessage, data []byte) {
 	if len(data) < 14 {
 		return
 	}
@@ -150,7 +150,7 @@ func parseEthernetHeader(bf *schema.FlowMessage, data []byte) {
 		if len(data) < 20 {
 			return
 		}
-		schema.Flows.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv4)
+		nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv4)
 		bf.SrcAddr = decodeIP(data[12:16])
 		bf.DstAddr = decodeIP(data[16:20])
 		proto = data[9]
@@ -165,19 +165,19 @@ func parseEthernetHeader(bf *schema.FlowMessage, data []byte) {
 		if len(data) < 40 {
 			return
 		}
-		schema.Flows.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv6)
+		nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnEType, helpers.ETypeIPv6)
 		bf.SrcAddr = decodeIP(data[8:24])
 		bf.DstAddr = decodeIP(data[24:40])
 		proto = data[6]
 		data = data[40:]
 	}
-	schema.Flows.ProtobufAppendVarint(bf, schema.ColumnProto, uint64(proto))
+	nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnProto, uint64(proto))

 	if proto == 6 || proto == 17 {
 		if len(data) > 4 {
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnSrcPort,
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnSrcPort,
 				uint64(binary.BigEndian.Uint16(data[0:2])))
-			schema.Flows.ProtobufAppendVarint(bf, schema.ColumnDstPort,
+			nd.d.Schema.ProtobufAppendVarint(bf, schema.ColumnDstPort,
 				uint64(binary.BigEndian.Uint16(data[2:4])))
 		}
 	}
--- a/inlet/flow/decoder/sflow/root.go
+++ b/inlet/flow/decoder/sflow/root.go
@@ -30,6 +30,7 @@ const (
 // Decoder contains the state for the sFlow v5 decoder.
 type Decoder struct {
 	r *reporter.Reporter
+	d decoder.Dependencies

 	metrics struct {
 		errors                *reporter.CounterVec
@@ -40,9 +41,10 @@ type Decoder struct {
 }

 // New instantiates a new sFlow decoder.
-func New(r *reporter.Reporter) decoder.Decoder {
+func New(r *reporter.Reporter, dependencies decoder.Dependencies) decoder.Decoder {
 	nd := &Decoder{
 		r: r,
+		d: dependencies,
 	}

 	nd.metrics.errors = nd.r.CounterVec(
@@ -129,7 +131,7 @@ func (nd *Decoder) Decode(in decoder.RawFlow) []*schema.FlowMessage {
 		}
 	}

-	flowMessageSet := decode(msgDec)
+	flowMessageSet := nd.decode(msgDec)
 	for _, fmsg := range flowMessageSet {
 		fmsg.TimeReceived = ts
 	}
--- a/inlet/flow/decoder/sflow/root_test.go
+++ b/inlet/flow/decoder/sflow/root_test.go
@@ -4,11 +4,9 @@
 package sflow

 import (
-	"fmt"
 	"net"
 	"net/netip"
 	"path/filepath"
-	"reflect"
 	"testing"

 	"akvorado/common/helpers"
@@ -19,7 +17,7 @@ import (

 func TestDecode(t *testing.T) {
 	r := reporter.NewMock(t)
-	sdecoder := New(r)
+	sdecoder := New(r, decoder.Dependencies{Schema: schema.NewMock(t)})

 	// Send data
 	data := helpers.ReadPcapPayload(t, filepath.Join("testdata", "data-1140.pcap"))
@@ -119,7 +117,7 @@ func TestDecode(t *testing.T) {
 		f.TimeReceived = 0
 	}

-	if diff := helpers.Diff(got, expectedFlows, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+	if diff := helpers.Diff(got, expectedFlows); diff != "" {
 		t.Fatalf("Decode() (-got, +want):\n%s", diff)
 	}
 	gotMetrics := r.GetMetrics(
@@ -139,7 +137,7 @@ func TestDecode(t *testing.T) {

 func TestDecodeInterface(t *testing.T) {
 	r := reporter.NewMock(t)
-	sdecoder := New(r)
+	sdecoder := New(r, decoder.Dependencies{Schema: schema.NewMock(t)})

 	t.Run("local interface", func(t *testing.T) {
 		// Send data
@@ -170,7 +168,7 @@ func TestDecodeInterface(t *testing.T) {
 			f.TimeReceived = 0
 		}

-		if diff := helpers.Diff(got, expectedFlows, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+		if diff := helpers.Diff(got, expectedFlows); diff != "" {
 			t.Fatalf("Decode() (-got, +want):\n%s", diff)
 		}
 	})
@@ -205,7 +203,7 @@ func TestDecodeInterface(t *testing.T) {
 			f.TimeReceived = 0
 		}

-		if diff := helpers.Diff(got, expectedFlows, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+		if diff := helpers.Diff(got, expectedFlows); diff != "" {
 			t.Fatalf("Decode() (-got, +want):\n%s", diff)
 		}
 	})
@@ -239,7 +237,7 @@ func TestDecodeInterface(t *testing.T) {
 			f.TimeReceived = 0
 		}

-		if diff := helpers.Diff(got, expectedFlows, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+		if diff := helpers.Diff(got, expectedFlows); diff != "" {
 			t.Fatalf("Decode() (-got, +want):\n%s", diff)
 		}
 	})
@@ -278,7 +276,7 @@ func TestDecodeInterface(t *testing.T) {
 			f.TimeReceived = 0
 		}

-		if diff := helpers.Diff(got, expectedFlows, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+		if diff := helpers.Diff(got, expectedFlows); diff != "" {
 			t.Fatalf("Decode() (-got, +want):\n%s", diff)
 		}

--- a/inlet/flow/decoder/tests.go
+++ b/inlet/flow/decoder/tests.go
@@ -13,7 +13,9 @@ import (

 // DummyDecoder is a simple decoder producing flows from random data.
 // The payload is copied in IfDescription
-type DummyDecoder struct{}
+type DummyDecoder struct {
+	Schema *schema.Component
+}

 // Decode returns uninteresting flow messages.
 func (dc *DummyDecoder) Decode(in RawFlow) []*schema.FlowMessage {
@@ -22,9 +24,9 @@ func (dc *DummyDecoder) Decode(in RawFlow) []*schema.FlowMessage {
 		TimeReceived:    uint64(in.TimeReceived.UTC().Unix()),
 		ExporterAddress: exporterAddress,
 	}
-	schema.Flows.ProtobufAppendVarint(f, schema.ColumnBytes, uint64(len(in.Payload)))
-	schema.Flows.ProtobufAppendVarint(f, schema.ColumnPackets, 1)
-	schema.Flows.ProtobufAppendBytes(f, schema.ColumnInIfDescription, in.Payload)
+	dc.Schema.ProtobufAppendVarint(f, schema.ColumnBytes, uint64(len(in.Payload)))
+	dc.Schema.ProtobufAppendVarint(f, schema.ColumnPackets, 1)
+	dc.Schema.ProtobufAppendBytes(f, schema.ColumnInIfDescription, in.Payload)
 	return []*schema.FlowMessage{f}
 }

--- a/inlet/flow/decoder_test.go
+++ b/inlet/flow/decoder_test.go
@@ -21,7 +21,8 @@ import (
 func BenchmarkDecodeEncodeNetflow(b *testing.B) {
 	schema.DisableDebug(b)
 	r := reporter.NewMock(b)
-	nfdecoder := netflow.New(r)
+	sch := schema.NewMock(b)
+	nfdecoder := netflow.New(r, decoder.Dependencies{Schema: sch})

 	template := helpers.ReadPcapPayload(b, filepath.Join("decoder", "netflow", "testdata", "options-template-257.pcap"))
 	got := nfdecoder.Decode(decoder.RawFlow{Payload: template, Source: net.ParseIP("127.0.0.1")})
@@ -50,7 +51,7 @@ func BenchmarkDecodeEncodeNetflow(b *testing.B) {
 				got = nfdecoder.Decode(decoder.RawFlow{Payload: data, Source: net.ParseIP("127.0.0.1")})
 				if withEncoding {
 					for _, flow := range got {
-						schema.Flows.ProtobufMarshal(flow)
+						sch.ProtobufMarshal(flow)
 					}
 				}
 			}
@@ -64,7 +65,8 @@ func BenchmarkDecodeEncodeNetflow(b *testing.B) {
 func BenchmarkDecodeEncodeSflow(b *testing.B) {
 	schema.DisableDebug(b)
 	r := reporter.NewMock(b)
-	sdecoder := sflow.New(r)
+	sch := schema.NewMock(b)
+	sdecoder := sflow.New(r, decoder.Dependencies{Schema: sch})
 	data := helpers.ReadPcapPayload(b, filepath.Join("decoder", "sflow", "testdata", "data-1140.pcap"))

 	for _, withEncoding := range []bool{true, false} {
@@ -78,7 +80,7 @@ func BenchmarkDecodeEncodeSflow(b *testing.B) {
 				got = sdecoder.Decode(decoder.RawFlow{Payload: data, Source: net.ParseIP("127.0.0.1")})
 				if withEncoding {
 					for _, flow := range got {
-						schema.Flows.ProtobufMarshal(flow)
+						sch.ProtobufMarshal(flow)
 					}
 				}
 			}
--- a/inlet/flow/input/file/root_test.go
+++ b/inlet/flow/input/file/root_test.go
@@ -19,7 +19,9 @@ func TestFileInput(t *testing.T) {
 	r := reporter.NewMock(t)
 	configuration := DefaultConfiguration().(*Configuration)
 	configuration.Paths = []string{path.Join("testdata", "file1.txt"), path.Join("testdata", "file2.txt")}
-	in, err := configuration.New(r, daemon.NewMock(t), &decoder.DummyDecoder{})
+	in, err := configuration.New(r, daemon.NewMock(t), &decoder.DummyDecoder{
+		Schema: schema.NewMock(t),
+	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
--- a/inlet/flow/input/udp/root_test.go
+++ b/inlet/flow/input/udp/root_test.go
@@ -4,10 +4,8 @@
 package udp

 import (
-	"fmt"
 	"net"
 	"net/netip"
-	"reflect"
 	"testing"
 	"time"

@@ -22,7 +20,7 @@ func TestUDPInput(t *testing.T) {
 	r := reporter.NewMock(t)
 	configuration := DefaultConfiguration().(*Configuration)
 	configuration.Listen = "127.0.0.1:0"
-	in, err := configuration.New(r, daemon.NewMock(t), &decoder.DummyDecoder{})
+	in, err := configuration.New(r, daemon.NewMock(t), &decoder.DummyDecoder{Schema: schema.NewMock(t)})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
@@ -73,7 +71,7 @@ func TestUDPInput(t *testing.T) {
 			},
 		},
 	}
-	if diff := helpers.Diff(got, expected, helpers.DiffFormatter(reflect.TypeOf(schema.ColumnBytes), fmt.Sprint)); diff != "" {
+	if diff := helpers.Diff(got, expected); diff != "" {
 		t.Fatalf("Input data (-got, +want):\n%s", diff)
 	}

@@ -99,7 +97,9 @@ func TestOverflow(t *testing.T) {
 	configuration := DefaultConfiguration().(*Configuration)
 	configuration.Listen = "127.0.0.1:0"
 	configuration.QueueSize = 1
-	in, err := configuration.New(r, daemon.NewMock(t), &decoder.DummyDecoder{})
+	in, err := configuration.New(r, daemon.NewMock(t), &decoder.DummyDecoder{
+		Schema: schema.NewMock(t),
+	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
--- a/inlet/flow/root.go
+++ b/inlet/flow/root.go
@@ -47,6 +47,7 @@ type Component struct {
 type Dependencies struct {
 	Daemon daemon.Component
 	HTTP   *http.Component
+	Schema *schema.Component
 }

 // New creates a new flow component.
@@ -77,7 +78,7 @@ func New(r *reporter.Reporter, configuration Configuration, dependencies Depende
 		if !ok {
 			return nil, fmt.Errorf("unknown decoder %q", input.Decoder)
 		}
-		dec = decoderfunc(r)
+		dec = decoderfunc(r, decoder.Dependencies{Schema: c.d.Schema})
 		alreadyInitialized[input.Decoder] = dec
 		decs[idx] = c.wrapDecoder(dec, input.UseSrcAddrForExporterAddr)
 	}
@@ -120,7 +121,7 @@ func New(r *reporter.Reporter, configuration Configuration, dependencies Depende
 	c.d.HTTP.AddHandler("/api/v0/inlet/flow/schema.proto",
 		netHTTP.HandlerFunc(func(w netHTTP.ResponseWriter, r *netHTTP.Request) {
 			w.Header().Set("Content-Type", "text/plain")
-			w.Write([]byte(schema.Flows.ProtobufDefinition()))
+			w.Write([]byte(c.d.Schema.ProtobufDefinition()))
 		}))

 	return &c, nil
--- a/inlet/flow/tests.go
+++ b/inlet/flow/tests.go
@@ -34,6 +34,7 @@ func NewMock(t *testing.T, r *reporter.Reporter, config Configuration) *Componen
 	c, err := New(r, config, Dependencies{
 		Daemon: daemon.NewMock(t),
 		HTTP:   http.NewMock(t, r),
+		Schema: schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
--- a/inlet/kafka/functional_test.go
+++ b/inlet/kafka/functional_test.go
@@ -29,9 +29,9 @@ func TestRealKafka(t *testing.T) {
 	configuration.Brokers = brokers
 	configuration.Version = kafka.Version(sarama.V2_8_1_0)
 	configuration.FlushInterval = 100 * time.Millisecond
-	expectedTopicName := fmt.Sprintf("%s-%s", topicName, schema.Flows.ProtobufMessageHash())
+	expectedTopicName := fmt.Sprintf("%s-%s", topicName, schema.NewMock(t).ProtobufMessageHash())
 	r := reporter.NewMock(t)
-	c, err := New(r, configuration, Dependencies{Daemon: daemon.NewMock(t)})
+	c, err := New(r, configuration, Dependencies{Daemon: daemon.NewMock(t), Schema: schema.NewMock(t)})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
--- a/inlet/kafka/root.go
+++ b/inlet/kafka/root.go
@@ -37,6 +37,7 @@ type Component struct {
 // Dependencies define the dependencies of the Kafka exporter.
 type Dependencies struct {
 	Daemon daemon.Component
+	Schema *schema.Component
 }

 // New creates a new HTTP component.
@@ -65,7 +66,7 @@ func New(reporter *reporter.Reporter, configuration Configuration, dependencies
 		config: configuration,

 		kafkaConfig: kafkaConfig,
-		kafkaTopic:  fmt.Sprintf("%s-%s", configuration.Topic, schema.Flows.ProtobufMessageHash()),
+		kafkaTopic:  fmt.Sprintf("%s-%s", configuration.Topic, dependencies.Schema.ProtobufMessageHash()),
 	}
 	c.initMetrics()
 	c.createKafkaProducer = func() (sarama.AsyncProducer, error) {
--- a/inlet/kafka/root_test.go
+++ b/inlet/kafka/root_test.go
@@ -27,7 +27,7 @@ func TestKafka(t *testing.T) {
 	mockProducer.ExpectInputWithMessageCheckerFunctionAndSucceed(func(got *sarama.ProducerMessage) error {
 		defer close(received)
 		expected := sarama.ProducerMessage{
-			Topic:     fmt.Sprintf("flows-%s", schema.Flows.ProtobufMessageHash()),
+			Topic:     fmt.Sprintf("flows-%s", c.d.Schema.ProtobufMessageHash()),
 			Key:       got.Key,
 			Value:     sarama.ByteEncoder("hello world!"),
 			Partition: got.Partition,
@@ -52,7 +52,7 @@ func TestKafka(t *testing.T) {
 	gotMetrics := r.GetMetrics("akvorado_inlet_kafka_")
 	expectedMetrics := map[string]string{
 		`sent_bytes_total{exporter="127.0.0.1"}`: "26",
-		fmt.Sprintf(`errors_total{error="kafka: Failed to produce message to topic flows-%s: noooo"}`, schema.Flows.ProtobufMessageHash()): "1",
+		fmt.Sprintf(`errors_total{error="kafka: Failed to produce message to topic flows-%s: noooo"}`, c.d.Schema.ProtobufMessageHash()): "1",
 		`sent_messages_total{exporter="127.0.0.1"}`: "2",
 	}
 	if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
@@ -62,7 +62,7 @@ func TestKafka(t *testing.T) {

 func TestKafkaMetrics(t *testing.T) {
 	r := reporter.NewMock(t)
-	c, err := New(r, DefaultConfiguration(), Dependencies{Daemon: daemon.NewMock(t)})
+	c, err := New(r, DefaultConfiguration(), Dependencies{Daemon: daemon.NewMock(t), Schema: schema.NewMock(t)})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
--- a/inlet/kafka/tests.go
+++ b/inlet/kafka/tests.go
@@ -14,13 +14,17 @@ import (
 	"akvorado/common/daemon"
 	"akvorado/common/helpers"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 )

 // NewMock creates a new Kafka component with a mocked Kafka. It will
 // panic if it cannot be started.
 func NewMock(t *testing.T, reporter *reporter.Reporter, configuration Configuration) (*Component, *mocks.AsyncProducer) {
 	t.Helper()
-	c, err := New(reporter, configuration, Dependencies{Daemon: daemon.NewMock(t)})
+	c, err := New(reporter, configuration, Dependencies{
+		Daemon: daemon.NewMock(t),
+		Schema: schema.NewMock(t),
+	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
--- a/orchestrator/clickhouse/http.go
+++ b/orchestrator/clickhouse/http.go
@@ -13,8 +13,6 @@ import (
 	"strconv"
 	"text/template"
 	"time"
-
-	"akvorado/common/schema"
 )

 var (
@@ -71,8 +69,8 @@ func (c *Component) registerHTTPHandlers() error {
 		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			var result bytes.Buffer
 			if err := initShTemplate.Execute(&result, initShVariables{
-				FlowSchemaHash: schema.Flows.ProtobufMessageHash(),
-				FlowSchema:     schema.Flows.ProtobufDefinition(),
+				FlowSchemaHash: c.d.Schema.ProtobufMessageHash(),
+				FlowSchema:     c.d.Schema.ProtobufDefinition(),
 				SystemLogTTL:   int(c.config.SystemLogTTL.Seconds()),
 				SystemLogTables: []string{
 					"asynchronous_metric_log",
--- a/orchestrator/clickhouse/http_test.go
+++ b/orchestrator/clickhouse/http_test.go
@@ -28,6 +28,7 @@ func TestHTTPEndpoints(t *testing.T) {
 	c, err := New(r, config, Dependencies{
 		Daemon: daemon.NewMock(t),
 		HTTP:   http.NewMock(t, r),
+		Schema: schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
@@ -65,7 +66,7 @@ func TestHTTPEndpoints(t *testing.T) {
 				``,
 				`# Install Protobuf schema`,
 				fmt.Sprintf(`cat > /var/lib/clickhouse/format_schemas/flow-%s.proto <<'EOPROTO'`,
-					schema.Flows.ProtobufMessageHash()),
+					c.d.Schema.ProtobufMessageHash()),
 				"",
 				`syntax = "proto3";`,
 			},
@@ -84,6 +85,7 @@ func TestAdditionalASNs(t *testing.T) {
 	c, err := New(r, config, Dependencies{
 		Daemon: daemon.NewMock(t),
 		HTTP:   http.NewMock(t, r),
+		Schema: schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
@@ -177,6 +179,7 @@ func TestNetworkSources(t *testing.T) {
 	c, err := New(r, config, Dependencies{
 		Daemon: daemon.NewMock(t),
 		HTTP:   http.NewMock(t, r),
+		Schema: schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
--- a/orchestrator/clickhouse/migrations_helpers.go
+++ b/orchestrator/clickhouse/migrations_helpers.go
@@ -124,7 +124,7 @@ LAYOUT({{ .Layout }}())
 func (c *Component) createExportersView(ctx context.Context) error {
 	// Select the columns we need
 	cols := []string{}
-	for _, column := range schema.Flows.Columns() {
+	for _, column := range c.d.Schema.Columns() {
 		if column.Key == schema.ColumnTimeReceived || strings.HasPrefix(column.Name, "Exporter") {
 			cols = append(cols, column.Name)
 		}
@@ -177,7 +177,7 @@ AS %s

 // createRawFlowsTable creates the raw flow table
 func (c *Component) createRawFlowsTable(ctx context.Context) error {
-	hash := schema.Flows.ProtobufMessageHash()
+	hash := c.d.Schema.ProtobufMessageHash()
 	tableName := fmt.Sprintf("flows_%s_raw", hash)
 	kafkaEngine := fmt.Sprintf("Kafka SETTINGS %s", strings.Join([]string{
 		fmt.Sprintf(`kafka_broker_list = '%s'`,
@@ -198,7 +198,7 @@ func (c *Component) createRawFlowsTable(ctx context.Context) error {
 		gin.H{
 			"Database": c.config.Database,
 			"Table":    tableName,
-			"Schema": schema.Flows.ClickHouseCreateTable(
+			"Schema": c.d.Schema.ClickHouseCreateTable(
 				schema.ClickHouseSkipGeneratedColumns,
 				schema.ClickHouseUseTransformFromType,
 				schema.ClickHouseSkipAliasedColumns),
@@ -235,7 +235,7 @@ func (c *Component) createRawFlowsTable(ctx context.Context) error {
 }

 func (c *Component) createRawFlowsConsumerView(ctx context.Context) error {
-	tableName := fmt.Sprintf("flows_%s_raw", schema.Flows.ProtobufMessageHash())
+	tableName := fmt.Sprintf("flows_%s_raw", c.d.Schema.ProtobufMessageHash())
 	viewName := fmt.Sprintf("%s_consumer", tableName)

 	// Build SELECT query
@@ -243,7 +243,7 @@ func (c *Component) createRawFlowsConsumerView(ctx context.Context) error {
 		`{{ .With }} SELECT {{ .Columns }} FROM {{ .Database }}.{{ .Table }} WHERE length(_error) = 0`,
 		gin.H{
 			"With": "WITH arrayCompact(DstASPath) AS c_DstASPath",
-			"Columns": strings.Join(schema.Flows.ClickHouseSelectColumns(
+			"Columns": strings.Join(c.d.Schema.ClickHouseSelectColumns(
 				schema.ClickHouseSubstituteGenerates,
 				schema.ClickHouseSubstituteTransforms,
 				schema.ClickHouseSkipAliasedColumns), ", "),
@@ -277,7 +277,7 @@ func (c *Component) createRawFlowsConsumerView(ctx context.Context) error {
 }

 func (c *Component) createRawFlowsErrorsView(ctx context.Context) error {
-	tableName := fmt.Sprintf("flows_%s_raw", schema.Flows.ProtobufMessageHash())
+	tableName := fmt.Sprintf("flows_%s_raw", c.d.Schema.ProtobufMessageHash())
 	viewName := fmt.Sprintf("%s_errors", tableName)

 	// Build SELECT query
@@ -350,7 +350,7 @@ PARTITION BY toYYYYMMDDhhmmss(toStartOfInterval(TimeReceived, INTERVAL {{ .Parti
 ORDER BY (TimeReceived, ExporterAddress, InIfName, OutIfName)
 TTL TimeReceived + toIntervalSecond({{ .TTL }})
 `, gin.H{
-				"Schema":            schema.Flows.ClickHouseCreateTable(),
+				"Schema":            c.d.Schema.ClickHouseCreateTable(),
 				"PartitionInterval": partitionInterval,
 				"TTL":               ttl,
 			})
@@ -364,10 +364,10 @@ ORDER BY ({{ .SortingKey }})
 TTL TimeReceived + toIntervalSecond({{ .TTL }})
 `, gin.H{
 				"Table":             tableName,
-				"Schema":            schema.Flows.ClickHouseCreateTable(schema.ClickHouseSkipMainOnlyColumns),
+				"Schema":            c.d.Schema.ClickHouseCreateTable(schema.ClickHouseSkipMainOnlyColumns),
 				"PartitionInterval": partitionInterval,
-				"PrimaryKey":        strings.Join(schema.Flows.ClickHousePrimaryKeys(), ", "),
-				"SortingKey":        strings.Join(schema.Flows.ClickHouseSortingKeys(), ", "),
+				"PrimaryKey":        strings.Join(c.d.Schema.ClickHousePrimaryKeys(), ", "),
+				"SortingKey":        strings.Join(c.d.Schema.ClickHouseSortingKeys(), ", "),
 				"TTL":               ttl,
 			})
 		}
@@ -402,7 +402,7 @@ ORDER BY position ASC
 	modifications := []string{}
 	previousColumn := ""
 outer:
-	for _, wantedColumn := range schema.Flows.Columns() {
+	for _, wantedColumn := range c.d.Schema.Columns() {
 		if resolution.Interval > 0 && wantedColumn.MainOnly {
 			continue
 		}
@@ -411,12 +411,12 @@ outer:
 			if wantedColumn.Name == existingColumn.Name {
 				// Do a few sanity checks
 				if wantedColumn.ClickHouseType != existingColumn.Type {
-					if slices.Contains(schema.Flows.ClickHousePrimaryKeys(), wantedColumn.Name) {
+					if slices.Contains(c.d.Schema.ClickHousePrimaryKeys(), wantedColumn.Name) {
 						return fmt.Errorf("table %s, primary key column %s has a non-matching type: %s vs %s",
 							tableName, wantedColumn.Name, existingColumn.Type, wantedColumn.ClickHouseType)
 					}
 				}
-				if resolution.Interval > 0 && slices.Contains(schema.Flows.ClickHousePrimaryKeys(), wantedColumn.Name) && existingColumn.IsPrimaryKey == 0 {
+				if resolution.Interval > 0 && slices.Contains(c.d.Schema.ClickHousePrimaryKeys(), wantedColumn.Name) && existingColumn.IsPrimaryKey == 0 {
 					return fmt.Errorf("table %s, column %s should be a primary key, cannot change that",
 						tableName, wantedColumn.Name)
 				}
@@ -440,7 +440,7 @@ outer:
 			}
 		}
 		// Add the missing column. Only if not primary.
-		if resolution.Interval > 0 && slices.Contains(schema.Flows.ClickHousePrimaryKeys(), wantedColumn.Name) {
+		if resolution.Interval > 0 && slices.Contains(c.d.Schema.ClickHousePrimaryKeys(), wantedColumn.Name) {
 			return fmt.Errorf("table %s, column %s is missing but it is a primary key",
 				tableName, wantedColumn.Name)
 		}
@@ -453,7 +453,7 @@ outer:
 		// Also update ORDER BY
 		if resolution.Interval > 0 {
 			modifications = append(modifications,
-				fmt.Sprintf("MODIFY ORDER BY (%s)", strings.Join(schema.Flows.ClickHouseSortingKeys(), ", ")))
+				fmt.Sprintf("MODIFY ORDER BY (%s)", strings.Join(c.d.Schema.ClickHouseSortingKeys(), ", ")))
 		}
 		c.r.Info().Msgf("apply %d modifications to %s", len(modifications), tableName)
 		if resolution.Interval > 0 {
@@ -503,7 +503,7 @@ SELECT
 FROM {{ .Database }}.flows`, gin.H{
 		"Database": c.config.Database,
 		"Seconds":  uint64(resolution.Interval.Seconds()),
-		"Columns": strings.Join(schema.Flows.ClickHouseSelectColumns(
+		"Columns": strings.Join(c.d.Schema.ClickHouseSelectColumns(
 			schema.ClickHouseSkipTimeReceived,
 			schema.ClickHouseSkipMainOnlyColumns,
 			schema.ClickHouseSkipAliasedColumns), ",\n "),
--- a/orchestrator/clickhouse/migrations_test.go
+++ b/orchestrator/clickhouse/migrations_test.go
@@ -62,7 +62,7 @@ FROM system.tables
 WHERE database=currentDatabase() AND table NOT LIKE '.%'
 ORDER BY length(table) ASC`

-func dumpAllTables(t *testing.T, ch *clickhousedb.Component) map[string]string {
+func dumpAllTables(t *testing.T, ch *clickhousedb.Component, schemaComponent *schema.Component) map[string]string {
 	// TODO: find the right ordering, this one does not totally work
 	rows, err := ch.Query(context.Background(), dumpAllTablesQuery)
 	if err != nil {
@@ -74,7 +74,7 @@ func dumpAllTables(t *testing.T, ch *clickhousedb.Component) map[string]string {
 		if err := rows.Scan(&table, &schema); err != nil {
 			t.Fatalf("Scan() error:\n%+v", err)
 		}
-		if !oldTable(table) {
+		if !oldTable(schemaComponent, table) {
 			schemas[table] = schema
 		}
 	}
@@ -86,9 +86,9 @@ type tableWithSchema struct {
 	schema string
 }

-func loadTables(t *testing.T, ch *clickhousedb.Component, schemas []tableWithSchema) {
+func loadTables(t *testing.T, ch *clickhousedb.Component, sch *schema.Component, schemas []tableWithSchema) {
 	for _, tws := range schemas {
-		if oldTable(tws.table) {
+		if oldTable(sch, tws.table) {
 			continue
 		}
 		t.Logf("Load table %s", tws.table)
@@ -98,8 +98,8 @@ func loadTables(t *testing.T, ch *clickhousedb.Component, schemas []tableWithSch
 	}
 }

-func oldTable(table string) bool {
-	if strings.Contains(table, schema.Flows.ProtobufMessageHash()) {
+func oldTable(schema *schema.Component, table string) bool {
+	if strings.Contains(table, schema.ProtobufMessageHash()) {
 		return false
 	}
 	if strings.HasSuffix(table, "_raw") || strings.HasSuffix(table, "_raw_consumer") || strings.HasSuffix(table, "_raw_errors") {
@@ -110,7 +110,7 @@ func oldTable(table string) bool {

 // loadAllTables load tables from a CSV file. Use `format CSV` with
 // query from dumpAllTables.
-func loadAllTables(t *testing.T, ch *clickhousedb.Component, filename string) {
+func loadAllTables(t *testing.T, ch *clickhousedb.Component, sch *schema.Component, filename string) {
 	input, err := os.Open(filename)
 	if err != nil {
 		t.Fatalf("Open(%q) error:\n%+v", filename, err)
@@ -136,7 +136,7 @@ func loadAllTables(t *testing.T, ch *clickhousedb.Component, filename string) {
 	}
 	dropAllTables(t, ch)
 	t.Logf("(%s) Load all tables from dump %s", time.Now(), filename)
-	loadTables(t, ch, schemas)
+	loadTables(t, ch, sch, schemas)
 	t.Logf("(%s) Loaded all tables from dump %s", time.Now(), filename)
 }

@@ -161,6 +161,7 @@ func TestGetHTTPBaseURL(t *testing.T) {
 	c, err := New(r, DefaultConfiguration(), Dependencies{
 		Daemon: daemon.NewMock(t),
 		HTTP:   http,
+		Schema: schema.NewMock(t),
 	})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
@@ -201,7 +202,7 @@ func TestMigration(t *testing.T) {
 	}
 	for _, f := range files {
 		t.Run(f.Name(), func(t *testing.T) {
-			loadAllTables(t, chComponent, path.Join("testdata/states", f.Name()))
+			loadAllTables(t, chComponent, schema.NewMock(t), path.Join("testdata/states", f.Name()))
 			r := reporter.NewMock(t)
 			configuration := DefaultConfiguration()
 			configuration.OrchestratorURL = "http://something"
@@ -209,6 +210,7 @@ func TestMigration(t *testing.T) {
 			ch, err := New(r, configuration, Dependencies{
 				Daemon:     daemon.NewMock(t),
 				HTTP:       http.NewMock(t, r),
+				Schema:     schema.NewMock(t),
 				ClickHouse: chComponent,
 			})
 			if err != nil {
@@ -225,14 +227,14 @@ WHERE database=currentDatabase() AND table NOT LIKE '.%'`)
 			if err != nil {
 				t.Fatalf("Query() error:\n%+v", err)
 			}
-			hash := schema.Flows.ProtobufMessageHash()
+			hash := ch.d.Schema.ProtobufMessageHash()
 			got := []string{}
 			for rows.Next() {
 				var table string
 				if err := rows.Scan(&table); err != nil {
 					t.Fatalf("Scan() error:\n%+v", err)
 				}
-				if !oldTable(table) {
+				if !oldTable(ch.d.Schema, table) {
 					got = append(got, table)
 				}
 			}
@@ -256,7 +258,7 @@ WHERE database=currentDatabase() AND table NOT LIKE '.%'`)
 				t.Fatalf("SHOW TABLES (-got, +want):\n%s", diff)
 			}

-			currentRun := dumpAllTables(t, chComponent)
+			currentRun := dumpAllTables(t, chComponent, ch.d.Schema)
 			if lastRun != nil {
 				if diff := helpers.Diff(lastRun, currentRun); diff != "" {
 					t.Fatalf("Final state is different (-last, +current):\n%s", diff)
@@ -296,6 +298,7 @@ LIMIT 1`, proto.ClientName)
 			ch, err := New(r, configuration, Dependencies{
 				Daemon:     daemon.NewMock(t),
 				HTTP:       http.NewMock(t, r),
+				Schema:     schema.NewMock(t),
 				ClickHouse: chComponent,
 			})
 			if err != nil {
--- a/orchestrator/clickhouse/root.go
+++ b/orchestrator/clickhouse/root.go
@@ -18,6 +18,7 @@ import (
 	"akvorado/common/daemon"
 	"akvorado/common/http"
 	"akvorado/common/reporter"
+	"akvorado/common/schema"
 )

 // Component represents the ClickHouse configurator.
@@ -40,6 +41,7 @@ type Dependencies struct {
 	Daemon     daemon.Component
 	HTTP       *http.Component
 	ClickHouse *clickhousedb.Component
+	Schema     *schema.Component
 }

 // New creates a new ClickHouse component.
--- a/orchestrator/kafka/functional_test.go
+++ b/orchestrator/kafka/functional_test.go
@@ -22,11 +22,11 @@ func TestTopicCreation(t *testing.T) {

 	rand.Seed(time.Now().UnixMicro())
 	topicName := fmt.Sprintf("test-topic-%d", rand.Int())
-	expectedTopicName := fmt.Sprintf("%s-%s", topicName, schema.Flows.ProtobufMessageHash())
 	retentionMs := "76548"
 	segmentBytes := "107374184"
 	segmentBytes2 := "10737184"
 	cleanupPolicy := "delete"
+	expectedTopicName := fmt.Sprintf("%s-%s", topicName, schema.NewMock(t).ProtobufMessageHash())

 	cases := []struct {
 		Name          string
@@ -65,7 +65,7 @@ func TestTopicCreation(t *testing.T) {
 			}
 			configuration.Brokers = brokers
 			configuration.Version = kafka.Version(sarama.V2_8_1_0)
-			c, err := New(reporter.NewMock(t), configuration)
+			c, err := New(reporter.NewMock(t), configuration, Dependencies{Schema: schema.NewMock(t)})
 			if err != nil {
 				t.Fatalf("New() error:\n%+v", err)
 			}
@@ -96,7 +96,7 @@ func TestTopicMorePartitions(t *testing.T) {

 	rand.Seed(time.Now().UnixMicro())
 	topicName := fmt.Sprintf("test-topic-%d", rand.Int())
-	expectedTopicName := fmt.Sprintf("%s-%s", topicName, schema.Flows.ProtobufMessageHash())
+	expectedTopicName := fmt.Sprintf("%s-%s", topicName, schema.NewMock(t).ProtobufMessageHash())

 	configuration := DefaultConfiguration()
 	configuration.Topic = topicName
@@ -108,7 +108,7 @@ func TestTopicMorePartitions(t *testing.T) {

 	configuration.Brokers = brokers
 	configuration.Version = kafka.Version(sarama.V2_8_1_0)
-	c, err := New(reporter.NewMock(t), configuration)
+	c, err := New(reporter.NewMock(t), configuration, Dependencies{Schema: schema.NewMock(t)})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
@@ -133,7 +133,7 @@ func TestTopicMorePartitions(t *testing.T) {

 	// Increase number of partitions
 	configuration.TopicConfiguration.NumPartitions = 4
-	c, err = New(reporter.NewMock(t), configuration)
+	c, err = New(reporter.NewMock(t), configuration, Dependencies{Schema: schema.NewMock(t)})
 	if err != nil {
 		t.Fatalf("New() error:\n%+v", err)
 	}
--- a/orchestrator/kafka/root.go
+++ b/orchestrator/kafka/root.go
@@ -18,14 +18,20 @@ import (
 // Component represents the Kafka configurator.
 type Component struct {
 	r      *reporter.Reporter
+	d      Dependencies
 	config Configuration

 	kafkaConfig *sarama.Config
 	kafkaTopic  string
 }

+// Dependencies are the dependencies for the Kafka component
+type Dependencies struct {
+	Schema *schema.Component
+}
+
 // New creates a new Kafka configurator.
-func New(r *reporter.Reporter, config Configuration) (*Component, error) {
+func New(r *reporter.Reporter, config Configuration, dependencies Dependencies) (*Component, error) {
 	kafkaConfig, err := kafka.NewConfig(config.Configuration)
 	if err != nil {
 		return nil, err
@@ -36,10 +42,11 @@ func New(r *reporter.Reporter, config Configuration) (*Component, error) {

 	return &Component{
 		r:      r,
+		d:      dependencies,
 		config: config,

 		kafkaConfig: kafkaConfig,
-		kafkaTopic:  fmt.Sprintf("%s-%s", config.Topic, schema.Flows.ProtobufMessageHash()),
+		kafkaTopic:  fmt.Sprintf("%s-%s", config.Topic, dependencies.Schema.ProtobufMessageHash()),
 	}, nil
 }