fix explicit-group source-model fallback

src/server/services/tokenRouter.patterns.test.ts

@@ -93,6 +93,27 @@ describe('TokenRouter patterns and model mapping', () => {
     return { route, channel };
   }
 
+  async function createExplicitGroupRoute(
+    displayName: string,
+    sourceRouteIds: number[],
+  ) {
+    const route = await db.insert(schema.tokenRoutes).values({
+      modelPattern: displayName,
+      displayName,
+      routeMode: 'explicit_group',
+      enabled: true,
+    }).returning().get();
+
+    await db.insert(schema.routeGroupSources).values(
+      sourceRouteIds.map((sourceRouteId) => ({
+        groupRouteId: route.id,
+        sourceRouteId,
+      })),
+    ).run();
+
+    return route;
+  }
+
   it('matches routes with re: regex patterns', async () => {
     await createRouteWithSingleChannel('re:^claude-(opus|sonnet)-4-6$');
     const router = new TokenRouter();
@@ -181,4 +202,19 @@ describe('TokenRouter patterns and model mapping', () => {
     expect(selected?.actualModel).toBe('claude-opus-4-6');
     expect(decision.actualModel).toBe('claude-opus-4-6');
   });
+
+  it('falls back to the source exact-route model when explicit-group channels omit sourceModel', async () => {
+    const source = await createRouteWithSingleChannel('claude-opus-4-5');
+    await createExplicitGroupRoute('claude-test-4.6-sonnet', [source.route.id]);
+    const router = new TokenRouter();
+
+    const selected = await router.selectChannel('claude-test-4.6-sonnet');
+    const decision = await router.explainSelection('claude-test-4.6-sonnet');
+
+    expect(selected).toBeTruthy();
+    expect(selected?.actualModel).toBe('claude-opus-4-5');
+    expect(decision.actualModel).toBe('claude-opus-4-5');
+    expect(decision.summary).toContain('按显示名命中：claude-test-4.6-sonnet');
+    expect(decision.summary).toContain('实际转发模型：claude-opus-4-5');
+  });
 });

src/server/services/tokenRouter.ts

@@ -748,21 +748,26 @@ async function loadRouteMatch(route: RouteRow, nowMs = Date.now()): Promise<Rout
     return cached.match;
   }
 
+  const enabledRoutes = await loadEnabledRoutes(nowMs);
   const routeIds = (() => {
     if (!isExplicitGroupRoute(route)) {
       return [route.id];
     }
     return Array.from(new Set(route.sourceRouteIds.filter((routeId) => Number.isFinite(routeId) && routeId > 0)));
   })();
-  const enabledSourceRouteIds = isExplicitGroupRoute(route)
-    ? (await loadEnabledRoutes(nowMs))
-      .filter((item) => (
+  const enabledSourceRoutes = isExplicitGroupRoute(route)
+    ? enabledRoutes.filter((item) => (
       routeIds.includes(item.id)
       && !isExplicitGroupRoute(item)
       && isExactRouteModelPattern(item.modelPattern)
     ))
-      .map((item) => item.id)
-    : routeIds;
+    : enabledRoutes.filter((item) => routeIds.includes(item.id));
+  const enabledSourceRouteIds = enabledSourceRoutes.map((item) => item.id);
+  const fallbackSourceModelByRouteId = new Map<number, string>(
+    enabledSourceRoutes
+      .filter((item) => isExactRouteModelPattern(item.modelPattern))
+      .map((item) => [item.id, (item.modelPattern || '').trim()]),
+  );
   const channels = enabledSourceRouteIds.length > 0
     ? await db
       .select()
@@ -775,7 +780,12 @@ async function loadRouteMatch(route: RouteRow, nowMs = Date.now()): Promise<Rout
     : [];
 
   const mapped = channels.map((row) => ({
-    channel: row.route_channels,
+    channel: {
+      ...row.route_channels,
+      sourceModel: normalizeChannelSourceModel(row.route_channels.sourceModel)
+        || fallbackSourceModelByRouteId.get(row.route_channels.routeId)
+        || null,
+    },
     account: row.accounts,
     site: row.sites,
     token: row.account_tokens,