diff --git a/src/server/contracts/accountsRoutePayloads.ts b/src/server/contracts/accountsRoutePayloads.ts
index 134f36c..76132f6 100644
--- a/src/server/contracts/accountsRoutePayloads.ts
+++ b/src/server/contracts/accountsRoutePayloads.ts
@@ -21,9 +21,9 @@ const accountUpdatePayloadSchema = z.object({
   apiToken: z.union([z.string(), z.null()]).optional(),
   status: z.string().optional(),
   checkinEnabled: z.boolean().optional(),
-  unitCost: z.number().optional(),
+  unitCost: z.union([z.number(), z.null()]).optional(),
   extraConfig: z.union([z.string(), z.record(z.string(), z.unknown()), z.null()]).optional(),
-  refreshToken: z.string().optional(),
+  refreshToken: z.union([z.string(), z.null()]).optional(),
   tokenExpiresAt: z.union([z.number(), z.string(), z.null()]).optional(),
   isPinned: z.boolean().optional(),
   sortOrder: z.number().int().min(0).optional(),
@@ -98,6 +98,9 @@ function formatAccountsPayloadError(error: z.ZodError): string {
   if (firstPath === 'checkinEnabled') {
     return 'Invalid checkinEnabled. Expected boolean.';
   }
+  if (firstPath === 'unitCost') {
+    return 'Invalid unitCost. Expected number or null.';
+  }
   if (firstPath === 'credentialMode') {
     return 'Invalid credentialMode. Expected auto/session/apikey.';
   }
@@ -123,10 +126,10 @@ function formatAccountsPayloadError(error: z.ZodError): string {
     return 'Invalid platformUserId. Expected positive number.';
   }
   if (firstPath === 'refreshToken') {
-    return 'Invalid refreshToken. Expected string.';
+    return 'Invalid refreshToken. Expected string or null.';
   }
   if (firstPath === 'tokenExpiresAt') {
-    return 'Invalid tokenExpiresAt. Expected number or string.';
+    return 'Invalid tokenExpiresAt. Expected number, string, or null.';
   }
   if (firstPath === 'accountId') {
     return '账号 ID 无效';
diff --git a/src/server/routes/api/accountTokens.batch.test.ts b/src/server/routes/api/accountTokens.batch.test.ts
index 7e1f474..9dbd025 100644
--- a/src/server/routes/api/accountTokens.batch.test.ts
+++ b/src/server/routes/api/accountTokens.batch.test.ts
@@ -159,6 +159,39 @@ describe('account token batch routes', () => {
     expect(remaining.map((item) => item.id)).toEqual([2]);
   });
 
+  it('accepts the edit-panel payload when updating account token metadata without changing token value', async () => {
+    const response = await app.inject({
+      method: 'PUT',
+      url: '/api/account-tokens/1',
+      payload: {
+        name: 'token-1-updated',
+        group: 'default',
+        enabled: true,
+        isDefault: false,
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(response.json()).toMatchObject({
+      success: true,
+      token: {
+        id: 1,
+        name: 'token-1-updated',
+        tokenGroup: 'default',
+        enabled: true,
+        isDefault: false,
+      },
+    });
+
+    const row = await db.select().from(schema.accountTokens).where(eq(schema.accountTokens.id, 1)).get();
+    expect(row).toMatchObject({
+      name: 'token-1-updated',
+      tokenGroup: 'default',
+      enabled: true,
+      isDefault: false,
+    });
+  });
+
   it('rejects invalid account token batch action', async () => {
     const response = await app.inject({
       method: 'POST',
diff --git a/src/server/routes/api/accounts.credentialMode.test.ts b/src/server/routes/api/accounts.credentialMode.test.ts
index 84312b9..bd64dd0 100644
--- a/src/server/routes/api/accounts.credentialMode.test.ts
+++ b/src/server/routes/api/accounts.credentialMode.test.ts
@@ -415,7 +415,8 @@ describe('accounts credential mode', { timeout: 15_000 }, () => {
       method: 'PUT',
       url: `/api/accounts/${account.id}`,
       payload: {
-        refreshToken: '',
+        refreshToken: null,
+        tokenExpiresAt: null,
       },
     });
     expect(clearResponse.statusCode).toBe(200);
@@ -427,6 +428,54 @@ describe('accounts credential mode', { timeout: 15_000 }, () => {
     expect(parsedCleared.sub2apiAuth).toBeUndefined();
   });
 
+  it('accepts nullable optional fields from the edit panel payload', async () => {
+    const site = await db.insert(schema.sites).values({
+      name: 'Editable Site',
+      url: 'https://editable.example.com',
+      platform: 'new-api',
+    }).returning().get();
+    const account = await db.insert(schema.accounts).values({
+      siteId: site.id,
+      username: 'before-edit',
+      accessToken: 'access-token',
+      status: 'active',
+      unitCost: 25,
+      extraConfig: JSON.stringify({
+        proxyUrl: 'http://127.0.0.1:7890',
+      }),
+    }).returning().get();
+
+    const response = await app.inject({
+      method: 'PUT',
+      url: `/api/accounts/${account.id}`,
+      payload: {
+        username: 'after-edit',
+        status: 'disabled',
+        checkinEnabled: false,
+        unitCost: null,
+        accessToken: 'access-token-updated',
+        apiToken: null,
+        isPinned: false,
+        refreshToken: null,
+        tokenExpiresAt: null,
+        proxyUrl: null,
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    const updated = await db.select().from(schema.accounts).where(eq(schema.accounts.id, account.id)).get();
+    expect(updated).toMatchObject({
+      username: 'after-edit',
+      status: 'disabled',
+      checkinEnabled: false,
+      unitCost: null,
+      accessToken: 'access-token-updated',
+      apiToken: null,
+      isPinned: false,
+    });
+    expect(JSON.parse(updated?.extraConfig || '{}')).not.toHaveProperty('proxyUrl');
+  });
+
   it('does not refresh models for pin-only account edits', async () => {
     const site = await db.insert(schema.sites).values({
       name: 'Pinned Site',
diff --git a/src/server/routes/api/downstreamApiKeys.test.ts b/src/server/routes/api/downstreamApiKeys.test.ts
index 8c1f120..1b2e31c 100644
--- a/src/server/routes/api/downstreamApiKeys.test.ts
+++ b/src/server/routes/api/downstreamApiKeys.test.ts
@@ -163,6 +163,67 @@ describe('downstream api keys routes', () => {
     expect(listRes.json()).toMatchObject({ success: true, items: [] });
   });
 
+  it('clears nullable editor fields when updating a downstream api key', async () => {
+    const createRes = await app.inject({
+      method: 'POST',
+      url: '/api/downstream-keys',
+      payload: {
+        name: 'editor-key',
+        key: 'sk-editor-key-001',
+        description: 'editor consumer',
+        groupName: '项目A',
+        enabled: true,
+        expiresAt: '2026-12-31T00:00:00.000Z',
+        maxCost: 12.5,
+        maxRequests: 500,
+      },
+    });
+
+    expect(createRes.statusCode).toBe(200);
+    const keyId = (createRes.json() as { item: { id: number } }).item.id;
+
+    const updateRes = await app.inject({
+      method: 'PUT',
+      url: `/api/downstream-keys/${keyId}`,
+      payload: {
+        name: 'editor-key-updated',
+        key: 'sk-editor-key-001',
+        description: '',
+        groupName: null,
+        enabled: true,
+        expiresAt: null,
+        maxCost: null,
+        maxRequests: null,
+      },
+    });
+
+    expect(updateRes.statusCode).toBe(200);
+    expect(updateRes.json()).toMatchObject({
+      success: true,
+      item: {
+        id: keyId,
+        name: 'editor-key-updated',
+        description: null,
+        groupName: null,
+        expiresAt: null,
+        maxCost: null,
+        maxRequests: null,
+      },
+    });
+
+    const row = await db.select().from(schema.downstreamApiKeys)
+      .where(eq(schema.downstreamApiKeys.id, keyId))
+      .get();
+    expect(row).toMatchObject({
+      name: 'editor-key-updated',
+      description: null,
+      groupName: null,
+      expiresAt: null,
+      maxCost: null,
+      maxRequests: null,
+    });
+  });
+
   it('supports batch enable/disable/reset/delete operations', async () => {
     const inserted = await db.insert(schema.downstreamApiKeys).values([
       {
diff --git a/src/server/routes/api/downstreamApiKeys.ts b/src/server/routes/api/downstreamApiKeys.ts
index 4b78542..b018fe9 100644
--- a/src/server/routes/api/downstreamApiKeys.ts
+++ b/src/server/routes/api/downstreamApiKeys.ts
@@ -536,21 +536,22 @@ export async function downstreamApiKeysRoutes(app: FastifyInstance) {
 
     const existingView = toDownstreamApiKeyPolicyView(existing);
     const body = parsedBody.data;
+    const hasOwn = (key: string) => Object.prototype.hasOwnProperty.call(body, key);
     let normalized: ReturnType<typeof normalizeDownstreamApiKeyPayload>;
     try {
       normalized = normalizeDownstreamApiKeyPayload({
-        name: body.name ?? existing.name,
-        key: body.key ?? existing.key,
-        description: body.description ?? existing.description,
-        groupName: body.groupName ?? existing.groupName,
-        tags: body.tags ?? existingView.tags,
-        enabled: body.enabled ?? existing.enabled,
-        expiresAt: body.expiresAt ?? existing.expiresAt,
-        maxCost: body.maxCost ?? existing.maxCost,
-        maxRequests: body.maxRequests ?? existing.maxRequests,
-        supportedModels: body.supportedModels ?? existingView.supportedModels,
-        allowedRouteIds: body.allowedRouteIds ?? existingView.allowedRouteIds,
-        siteWeightMultipliers: body.siteWeightMultipliers ?? existingView.siteWeightMultipliers,
+        name: hasOwn('name') ? body.name : existing.name,
+        key: hasOwn('key') ? body.key : existing.key,
+        description: hasOwn('description') ? body.description : existing.description,
+        groupName: hasOwn('groupName') ? body.groupName : existing.groupName,
+        tags: hasOwn('tags') ? body.tags : existingView.tags,
+        enabled: hasOwn('enabled') ? body.enabled : existing.enabled,
+        expiresAt: hasOwn('expiresAt') ? body.expiresAt : existing.expiresAt,
+        maxCost: hasOwn('maxCost') ? body.maxCost : existing.maxCost,
+        maxRequests: hasOwn('maxRequests') ? body.maxRequests : existing.maxRequests,
+        supportedModels: hasOwn('supportedModels') ? body.supportedModels : existingView.supportedModels,
+        allowedRouteIds: hasOwn('allowedRouteIds') ? body.allowedRouteIds : existingView.allowedRouteIds,
+        siteWeightMultipliers: hasOwn('siteWeightMultipliers') ? body.siteWeightMultipliers : existingView.siteWeightMultipliers,
       });
     } catch (error: unknown) {
       return reply.code(400).send({ success: false, message: (error as Error)?.message || '参数无效' });
diff --git a/src/server/routes/api/monitor.test.ts b/src/server/routes/api/monitor.test.ts
index 6843efe..42e7f8e 100644
--- a/src/server/routes/api/monitor.test.ts
+++ b/src/server/routes/api/monitor.test.ts
@@ -3,6 +3,7 @@ import { afterAll, beforeAll, beforeEach, describe, expect, it } from 'vitest';
 import { mkdtempSync } from 'node:fs';
 import { join } from 'node:path';
 import { tmpdir } from 'node:os';
+import { eq } from 'drizzle-orm';
 
 type DbModule = typeof import('../../db/index.js');
 
@@ -50,4 +51,34 @@ describe('monitor routes', () => {
       message: 'Invalid ldohCookie. Expected string or null.',
     });
   });
+
+  it('accepts null monitor cookie payloads and clears the stored cookie', async () => {
+    const saveResponse = await app.inject({
+      method: 'PUT',
+      url: '/api/monitor/config',
+      payload: {
+        ldohCookie: 'ld_auth_session=abcdefghijklmnopqrstuvwxyz',
+      },
+    });
+    expect(saveResponse.statusCode).toBe(200);
+
+    const clearResponse = await app.inject({
+      method: 'PUT',
+      url: '/api/monitor/config',
+      payload: {
+        ldohCookie: null,
+      },
+    });
+
+    expect(clearResponse.statusCode).toBe(200);
+    expect(clearResponse.json()).toMatchObject({
+      success: true,
+      ldohCookieConfigured: false,
+    });
+
+    const saved = await db.select().from(schema.settings)
+      .where(eq(schema.settings.key, 'monitor_ldoh_cookie'))
+      .get();
+    expect(saved?.value).toBe('""');
+  });
 });
diff --git a/src/server/routes/api/sites.proxyUrl.test.ts b/src/server/routes/api/sites.proxyUrl.test.ts
index b833b66..61f97d3 100644
--- a/src/server/routes/api/sites.proxyUrl.test.ts
+++ b/src/server/routes/api/sites.proxyUrl.test.ts
@@ -215,6 +215,49 @@ describe('sites proxy settings', () => {
     expect(payload.useSystemProxy).toBe(true);
   });
 
+  it('clears optional editor fields when updating a site with empty strings', async () => {
+    const created = await app.inject({
+      method: 'POST',
+      url: '/api/sites',
+      payload: {
+        name: 'editable-site',
+        url: 'https://editable-site.example.com',
+        platform: 'new-api',
+        proxyUrl: 'http://127.0.0.1:8080',
+        useSystemProxy: true,
+        customHeaders: JSON.stringify({
+          'x-site-scope': 'internal',
+        }),
+        externalCheckinUrl: 'https://checkin.example.com/welfare',
+      },
+    });
+    expect(created.statusCode).toBe(200);
+    const site = created.json() as { id: number };
+
+    const response = await app.inject({
+      method: 'PUT',
+      url: `/api/sites/${site.id}`,
+      payload: {
+        proxyUrl: '',
+        useSystemProxy: false,
+        customHeaders: '',
+        externalCheckinUrl: '',
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    const payload = response.json() as {
+      proxyUrl?: string | null;
+      useSystemProxy?: boolean;
+      customHeaders?: string | null;
+      externalCheckinUrl?: string | null;
+    };
+    expect(payload.proxyUrl).toBeNull();
+    expect(payload.useSystemProxy).toBe(false);
+    expect(payload.customHeaders).toBeNull();
+    expect(payload.externalCheckinUrl).toBeNull();
+  });
+
   it('returns a conflict response when updating a site to an existing platform and url', async () => {
     const first = await app.inject({
       method: 'POST',
diff --git a/src/server/routes/api/tokens.route-update-rebuild.test.ts b/src/server/routes/api/tokens.route-update-rebuild.test.ts
index f37538d..936a597 100644
--- a/src/server/routes/api/tokens.route-update-rebuild.test.ts
+++ b/src/server/routes/api/tokens.route-update-rebuild.test.ts
@@ -578,6 +578,54 @@ describe('PUT /api/routes/:id route rebuild', () => {
     });
   });
 
+  it('accepts null tokenId when updating a channel and falls back to the account default token', async () => {
+    const seeded = await seedAccountWithToken('gpt-4o-mini');
+    const alternateToken = await db.insert(schema.accountTokens).values({
+      accountId: seeded.account.id,
+      name: 'token-alt',
+      token: 'sk-token-alt',
+      enabled: true,
+      isDefault: false,
+    }).returning().get();
+    await db.insert(schema.tokenModelAvailability).values({
+      tokenId: alternateToken.id,
+      modelName: 'gpt-4o-mini',
+      available: true,
+    }).run();
+
+    const route = await db.insert(schema.tokenRoutes).values({
+      modelPattern: 'gpt-4o-mini',
+      enabled: true,
+    }).returning().get();
+    const channel = await db.insert(schema.routeChannels).values({
+      routeId: route.id,
+      accountId: seeded.account.id,
+      tokenId: alternateToken.id,
+      sourceModel: 'gpt-4o-mini',
+      priority: 0,
+      weight: 10,
+      enabled: true,
+      manualOverride: true,
+    }).returning().get();
+
+    const response = await app.inject({
+      method: 'PUT',
+      url: `/api/channels/${channel.id}`,
+      payload: {
+        tokenId: null,
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(response.json()).toMatchObject({
+      id: channel.id,
+      tokenId: seeded.token.id,
+    });
+
+    const updated = await db.select().from(schema.routeChannels).where(eq(schema.routeChannels.id, channel.id)).get();
+    expect(updated?.tokenId).toBe(seeded.token.id);
+  });
+
   it('prefers an exact route over a colliding explicit-group display name', async () => {
     const exactCandidate = await seedAccountWithToken('claude-opus-4-6');
     const groupedCandidate = await seedAccountWithToken('claude-opus-4-5');
diff --git a/src/server/routes/api/tokens.ts b/src/server/routes/api/tokens.ts
index 01deeda..6c70600 100644
--- a/src/server/routes/api/tokens.ts
+++ b/src/server/routes/api/tokens.ts
@@ -1360,7 +1360,7 @@ export async function tokensRoutes(app: FastifyInstance) {
     if (body.priority !== undefined) updates.priority = body.priority;
     if (body.weight !== undefined) updates.weight = body.weight;
     if (body.enabled !== undefined) updates.enabled = body.enabled;
-    if (body.tokenId !== undefined) updates.tokenId = body.tokenId;
+    if (body.tokenId !== undefined) updates.tokenId = nextTokenId;
 
     await db.update(schema.routeChannels).set(updates).where(eq(schema.routeChannels.id, channelId)).run();
     await clearRouteDecisionSnapshot(channel.routeId);