diff --git a/deploy/scripts/common.sh b/deploy/scripts/common.sh
index 12b6fef..d834b53 100755
--- a/deploy/scripts/common.sh
+++ b/deploy/scripts/common.sh
@@ -433,7 +433,56 @@ wm_wait_for_health() {
 
 wm_smoke_test_route() {
   wm_compose exec --no-TTY watermaps node --input-type=module --eval '
-    const expectedSource = "local-geofabrik-germany+netherlands";
+    // ROUTE_SOURCE_VALIDATOR_START
+    const localEdgeSource = "local-geofabrik-germany+netherlands";
+    const postgisEdgeSource = "postgis-osm";
+    const bboxSource = String.raw`-?\d{1,3}\.\d{3}(?:--?\d{1,3}\.\d{3}){3}`;
+    const localGraphPattern = new RegExp(
+      `^fairway-graph:local-geofabrik-${bboxSource}$`
+    );
+    const combinedGraphPattern = new RegExp(
+      `^fairway-graph:combined-postgis-(${bboxSource})\\+local-geofabrik-\\1$`
+    );
+    const hasExpectedRouteSources = (dataSources) => {
+      if (
+        !Array.isArray(dataSources)
+        || dataSources.length < 2
+        || dataSources.some((source) => typeof source !== "string")
+        || new Set(dataSources).size !== dataSources.length
+      ) {
+        return false;
+      }
+
+      const graphSources = dataSources.filter((source) =>
+        source.startsWith("fairway-graph:")
+      );
+      const edgeSources = dataSources.filter((source) =>
+        !source.startsWith("fairway-graph:")
+      );
+      if (
+        graphSources.length !== 1
+        || edgeSources.length === 0
+        || edgeSources.some(
+          (source) => source !== localEdgeSource && source !== postgisEdgeSource
+        )
+      ) {
+        return false;
+      }
+
+      const graphSource = graphSources[0];
+      return (
+        localGraphPattern.test(graphSource)
+        && edgeSources.length === 1
+        && edgeSources[0] === localEdgeSource
+      ) || (
+        combinedGraphPattern.test(graphSource)
+        && (
+          edgeSources.includes(localEdgeSource)
+          || edgeSources.includes(postgisEdgeSource)
+        )
+      );
+    };
+    // ROUTE_SOURCE_VALIDATOR_END
     const routeChecks = [
       {
         name: "Emden–Ditzum",
@@ -552,8 +601,7 @@ wm_smoke_test_route() {
         alternative.routingMode === "fairway"
         && Array.isArray(alternative.geometry?.coordinates)
         && alternative.geometry.coordinates.length >= 2
-        && Array.isArray(alternative.dataSources)
-        && alternative.dataSources.includes(expectedSource)
+        && hasExpectedRouteSources(alternative.dataSources)
       );
       const routeSignatures = [
         route.geometry?.coordinates,
@@ -563,8 +611,7 @@ wm_smoke_test_route() {
         route.routingMode !== "fairway" ||
         !Array.isArray(routeCoordinates) ||
         routeCoordinates.length < (routeCheck.minimumCoordinates ?? 2) ||
-        !Array.isArray(route.dataSources) ||
-        !route.dataSources.includes(expectedSource) ||
+        !hasExpectedRouteSources(route.dataSources) ||
         alternatives.length < routeCheck.minimumAlternatives ||
         route.distanceNm < (routeCheck.minimumDistanceNm ?? 0) ||
         route.distanceNm > (routeCheck.maximumDistanceNm ?? Number.POSITIVE_INFINITY) ||
diff --git a/deploy/scripts/tests/route-smoke-sources.test.sh b/deploy/scripts/tests/route-smoke-sources.test.sh
new file mode 100755
index 0000000..534db2b
--- /dev/null
+++ b/deploy/scripts/tests/route-smoke-sources.test.sh
@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../.." && pwd)"
+COMMON_SH="$ROOT_DIR/deploy/scripts/common.sh"
+TEST_DIR="$(mktemp -d)"
+trap 'rm -rf "$TEST_DIR"' EXIT
+
+VALIDATOR_JS="$TEST_DIR/route-source-validator.mjs"
+awk '
+  /ROUTE_SOURCE_VALIDATOR_START/ { capture = 1; next }
+  /ROUTE_SOURCE_VALIDATOR_END/ { capture = 0 }
+  capture {
+    sub(/^    /, "")
+    print
+  }
+' "$COMMON_SH" >"$VALIDATOR_JS"
+
+[[ -s "$VALIDATOR_JS" ]] || {
+  printf 'Der Datenquellen-Validator konnte nicht aus common.sh gelesen werden.\n' >&2
+  exit 1
+}
+
+printf '%s\n' \
+  'const assertSourceValidity = (expected, dataSources, description) => {' \
+  '  const actual = hasExpectedRouteSources(dataSources);' \
+  '  if (actual !== expected) {' \
+  '    console.error(`${description}: erwartet ${expected}, erhalten ${actual}`);' \
+  '    process.exit(1);' \
+  '  }' \
+  '};' \
+  'const bbox = "7.037-53.192-7.623-53.615";' \
+  'const localSource = `fairway-graph:local-geofabrik-${bbox}`;' \
+  'const combinedSource = `fairway-graph:combined-postgis-${bbox}+local-geofabrik-${bbox}`;' \
+  'assertSourceValidity(true, [localSource, "local-geofabrik-germany+netherlands"], "lokaler Index");' \
+  'assertSourceValidity(true, [combinedSource, "postgis-osm"], "kombinierter Produktionsgraph");' \
+  'assertSourceValidity(true, [combinedSource, "local-geofabrik-germany+netherlands"], "kombinierter Graph mit lokalen Kanten");' \
+  'assertSourceValidity(true, [combinedSource, "postgis-osm", "local-geofabrik-germany+netherlands"], "kombinierter Graph mit beiden Kantenquellen");' \
+  'assertSourceValidity(false, ["local-geofabrik-germany+netherlands"], "lokale Kante ohne Graph");' \
+  'assertSourceValidity(false, [combinedSource], "kombinierter Graph ohne Kantenquelle");' \
+  'assertSourceValidity(false, [`fairway-graph:combined-postgis-${bbox}+local-geofabrik-7.000-53.000-8.000-54.000`, "postgis-osm"], "abweichende Ausschnitte");' \
+  'assertSourceValidity(false, ["fairway-graph:combined-postgis-anything+local-geofabrik-anything", "postgis-osm"], "ungültiger Ausschnitt");' \
+  'assertSourceValidity(false, ["postgis-osm"], "fehlender lokaler Graph");' \
+  'assertSourceValidity(false, [combinedSource, "postgis-osm", "osm-overpass"], "unbekannte Kantenquelle");' \
+  'assertSourceValidity(false, [`${combinedSource}+osm-overpass-live`, "postgis-osm"], "zusätzlicher Live-Graph");' \
+  'assertSourceValidity(false, [combinedSource, "postgis-osm", "postgis-osm"], "doppelte Quelle");' \
+  'assertSourceValidity(false, [combinedSource, 42], "Nicht-String-Quelle");' \
+  'assertSourceValidity(false, null, "fehlende Quellenliste");' \
+  'console.log("Routing-Smoke-Test-Datenquellen: OK");' \
+  >>"$VALIDATOR_JS"
+
+node "$VALIDATOR_JS"
diff --git a/package.json b/package.json
index c3f09e9..edfd8b9 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "setup:local-routing": "./scripts/setup-local-routing.sh",
     "sync:euris-locks": "node scripts/sync-euris-locks.mjs",
     "test": "npm run build --workspace @watermaps/shared && npm run test --workspace @watermaps/shared && npm run test --workspace @watermaps/api && npm run test --workspace @watermaps/web && npm run test:local-routing && npm run test:deployment",
-    "test:deployment": "bash deploy/scripts/tests/image-references.test.sh && bash deploy/scripts/tests/download-geofabrik.test.sh && bash deploy/scripts/tests/auto-deploy.test.sh && bash deploy/scripts/tests/upload-and-deploy.test.sh && bash deploy/scripts/tests/route-data-helpers.test.sh && bash deploy/scripts/tests/update-route-data.test.sh",
+    "test:deployment": "bash deploy/scripts/tests/image-references.test.sh && bash deploy/scripts/tests/download-geofabrik.test.sh && bash deploy/scripts/tests/route-smoke-sources.test.sh && bash deploy/scripts/tests/auto-deploy.test.sh && bash deploy/scripts/tests/upload-and-deploy.test.sh && bash deploy/scripts/tests/route-data-helpers.test.sh && bash deploy/scripts/tests/update-route-data.test.sh",
     "test:e2e": "npm run test:e2e --workspace @watermaps/web",
     "test:local-routing": "PYTHONPATH=.tools/python python3 -m unittest discover -s scripts/tests -p 'test_*.py'",
     "typecheck": "npm run build --workspace @watermaps/shared && npm run typecheck --workspace @watermaps/shared && npm run typecheck --workspace @watermaps/api && npm run typecheck --workspace @watermaps/web"