diff --git a/app/browser/dataset-preview.tsx b/app/browser/dataset-preview.tsx
index 112db9b915..7aa9546e5f 100644
--- a/app/browser/dataset-preview.tsx
+++ b/app/browser/dataset-preview.tsx
@@ -12,6 +12,7 @@ import Flex from "@/components/flex";
 import { HintRed, Loading, LoadingDataError } from "@/components/hint";
 import { DataSource } from "@/config-types";
 import { sourceToLabel } from "@/domain/datasource";
+import { getQueryRequestContext } from "@/graphql/hooks";
 import {
   useDataCubeMetadataQuery,
   useDataCubePreviewQuery,
@@ -86,6 +87,11 @@ export interface Preview {
   label: string;
 }
 
+const DATA_CUBE_PREVIEW_QUERY_REQUEST_CONTEXT = getQueryRequestContext({
+  querySource: "DataSetPreview / dataset-preview.tsx",
+  queryReason: "Needed to display a dataset preview in the /browse page.",
+});
+
 export const DataSetPreview = ({
   dataSetIri,
   dataSource,
@@ -110,7 +116,10 @@ export const DataSetPreview = ({
     useDataCubeMetadataQuery({ variables });
   const [
     { data: previewData, fetching: fetchingPreview, error: previewError },
-  ] = useDataCubePreviewQuery({ variables });
+  ] = useDataCubePreviewQuery({
+    variables,
+    context: DATA_CUBE_PREVIEW_QUERY_REQUEST_CONTEXT,
+  });
   const classes = useStyles({
     descriptionPresent: !!metadata?.dataCubeMetadata.description,
   });
diff --git a/app/gql-flamegraph/devtool.tsx b/app/gql-flamegraph/devtool.tsx
index e11f6a3b31..158296982e 100644
--- a/app/gql-flamegraph/devtool.tsx
+++ b/app/gql-flamegraph/devtool.tsx
@@ -330,14 +330,29 @@ const Queries = ({ queries }: { queries: RequestQueryMeta[] }) => {
         return (
           <div key={i} style={{ overflowX: "auto" }}>
             <div>
+              {q.source && (
+                <>
+                  <Typography variant="caption" sx={{ fontWeight: "bold" }}>
+                    {q.source}
+                  </Typography>
+                  {" – "}
+                </>
+              )}
               <Typography variant="caption">
                 {q.endTime - q.startTime}ms
               </Typography>{" "}
-              -{" "}
+              –{" "}
               <CopyLink toCopy={q.text} sx={{ fontSize: "small" }}>
                 Copy
               </CopyLink>
             </div>
+            {q.reason && (
+              <div style={{ marginBottom: "0.25rem" }}>
+                <Typography variant="caption" sx={{ fontStyle: "italic" }}>
+                  ℹ️ {q.reason}
+                </Typography>
+              </div>
+            )}
             <Box
               cols={100}
               rows={10}
diff --git a/app/graphql/client.tsx b/app/graphql/client.tsx
index 4e6ce1171d..99528e0a5d 100644
--- a/app/graphql/client.tsx
+++ b/app/graphql/client.tsx
@@ -6,23 +6,38 @@ import { flag } from "@/flags/flag";
 import { devtoolsExchanges } from "@/graphql/devtools";
 
 const graphqlEndpointFlag = flag("graphql.endpoint");
+
 if (graphqlEndpointFlag) {
   console.log("ℹ️ Using custom GraphQL endpoint:", graphqlEndpointFlag);
 }
-export const client = createClient({
-  url: graphqlEndpointFlag ?? GRAPHQL_ENDPOINT,
-  exchanges: [...devtoolsExchanges, ...defaultExchanges],
-  fetchOptions: {
-    headers: getHeaders(),
-  },
-});
 
-function getHeaders() {
+export const GQL_DEBUG_HEADER = "x-visualize-debug";
+export const GQL_CACHE_CONTROL_HEADER = "x-visualize-cache-control";
+export const GQL_QUERY_SOURCE_HEADER = "x-visualize-query-source";
+export const GQL_QUERY_REASON_HEADER = "x-visualize-query-reason";
+
+export const getGraphqlHeaders = ({
+  querySource,
+  queryReason,
+}: {
+  querySource?: string;
+  queryReason?: string;
+} = {}) => {
   const debug = flag("debug");
   const disableCache = flag("server-side-cache.disable");
 
   return {
-    "x-visualize-debug": debug ? "true" : "",
-    "x-visualize-cache-control": disableCache ? "no-cache" : "",
+    [GQL_DEBUG_HEADER]: debug ? "true" : "",
+    [GQL_CACHE_CONTROL_HEADER]: disableCache ? "no-cache" : "",
+    [GQL_QUERY_SOURCE_HEADER]: querySource ?? "",
+    [GQL_QUERY_REASON_HEADER]: queryReason ?? "",
   };
-}
+};
+
+export const client = createClient({
+  url: graphqlEndpointFlag ?? GRAPHQL_ENDPOINT,
+  exchanges: [...devtoolsExchanges, ...defaultExchanges],
+  fetchOptions: {
+    headers: getGraphqlHeaders(),
+  },
+});
diff --git a/app/graphql/context.tsx b/app/graphql/context.tsx
index 4222a1b234..e274b26cc4 100644
--- a/app/graphql/context.tsx
+++ b/app/graphql/context.tsx
@@ -12,6 +12,12 @@ import { SPARQL_GEO_ENDPOINT } from "@/domain/env";
 import { Awaited } from "@/domain/types";
 import { Timings } from "@/gql-flamegraph/resolvers";
 import { getMaybeCachedSparqlUrl } from "@/graphql/caching-utils";
+import {
+  GQL_CACHE_CONTROL_HEADER,
+  GQL_DEBUG_HEADER,
+  GQL_QUERY_REASON_HEADER,
+  GQL_QUERY_SOURCE_HEADER,
+} from "@/graphql/client";
 import { RequestQueryMeta } from "@/graphql/query-meta";
 import {
   QueryResolvers,
@@ -84,10 +90,17 @@ const createLoaders = async (
 
 export type Loaders = Awaited<ReturnType<typeof createLoaders>>;
 
-const setupSparqlClients = (
-  ctx: VisualizeGraphQLContext,
-  sourceUrl: string
-) => {
+const setupSparqlClients = ({
+  ctx,
+  sourceUrl,
+  querySource,
+  queryReason,
+}: {
+  ctx: VisualizeGraphQLContext;
+  sourceUrl: string;
+  querySource: string | undefined;
+  queryReason: string | undefined;
+}) => {
   const sparqlClient = new ParsingClient({
     endpointUrl: sourceUrl,
   });
@@ -105,6 +118,8 @@ const setupSparqlClients = (
       startTime: t.start,
       endTime: t.end,
       text: args[0],
+      source: querySource,
+      reason: queryReason,
     });
   };
 
@@ -147,11 +162,11 @@ const sparqlCache = new LRUCache({
 });
 
 const shouldUseServerSideCache = (req: IncomingMessage) => {
-  return req.headers["x-visualize-cache-control"] !== "no-cache";
+  return req.headers[GQL_CACHE_CONTROL_HEADER] !== "no-cache";
 };
 
 const isDebugMode = (req: IncomingMessage) => {
-  return req.headers["x-visualize-debug"] === "true";
+  return req.headers[GQL_DEBUG_HEADER] === "true";
 };
 
 const createContextContent = async ({
@@ -164,7 +179,12 @@ const createContextContent = async ({
   req: IncomingMessage;
 }) => {
   const { sparqlClient, sparqlClientStream, geoSparqlClient } =
-    setupSparqlClients(ctx, sourceUrl);
+    setupSparqlClients({
+      ctx,
+      sourceUrl,
+      querySource: req.headers[GQL_QUERY_SOURCE_HEADER]?.toString(),
+      queryReason: req.headers[GQL_QUERY_REASON_HEADER]?.toString(),
+    });
   const contextCache = shouldUseServerSideCache(req) ? sparqlCache : undefined;
   const loaders = await createLoaders(
     sparqlClient,
diff --git a/app/graphql/hooks.ts b/app/graphql/hooks.ts
index 5d6ad323a9..57b9bec01f 100644
--- a/app/graphql/hooks.ts
+++ b/app/graphql/hooks.ts
@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useState } from "react";
-import { Client, useClient } from "urql";
+import { Client, OperationContext, useClient } from "urql";
 
 import { ConfiguratorState, hasChartConfigs } from "@/configurator";
 import {
@@ -7,10 +7,8 @@ import {
   DataCubeMetadata,
   DataCubesObservations,
 } from "@/domain/data";
-import { Locale } from "@/locales/locales";
-import { assert } from "@/utils/assert";
-
-import { joinDimensions, mergeObservations } from "./join";
+import { getGraphqlHeaders } from "@/graphql/client";
+import { joinDimensions, mergeObservations } from "@/graphql/join";
 import {
   DataCubeComponentFilter,
   DataCubeComponentsDocument,
@@ -24,7 +22,24 @@ import {
   DataCubeObservationsDocument,
   DataCubeObservationsQuery,
   DataCubeObservationsQueryVariables,
-} from "./query-hooks";
+} from "@/graphql/query-hooks";
+import { Locale } from "@/locales/locales";
+import { assert } from "@/utils/assert";
+
+export const getQueryRequestContext = (options: {
+  querySource?: string;
+  queryReason?: string;
+}): Partial<OperationContext> => {
+  if (!options) {
+    return {};
+  }
+
+  return {
+    fetchOptions: {
+      headers: getGraphqlHeaders(options),
+    },
+  };
+};
 
 const useQueryKey = (options: object) => {
   return useMemo(() => {
diff --git a/app/graphql/query-meta.ts b/app/graphql/query-meta.ts
index 840fbe264b..1781442adf 100644
--- a/app/graphql/query-meta.ts
+++ b/app/graphql/query-meta.ts
@@ -2,5 +2,6 @@ export type RequestQueryMeta = {
   text: string;
   startTime: number;
   endTime: number;
-  label?: string;
+  source?: string;
+  reason?: string;
 };