diff --git a/src/http/routes/admin/tenants.ts b/src/http/routes/admin/tenants.ts
index da95b902a..0fce9dd2a 100644
--- a/src/http/routes/admin/tenants.ts
+++ b/src/http/routes/admin/tenants.ts
@@ -111,8 +111,8 @@ interface tenantDBInterface {
   id: string
   anon_key: string
   database_url: string
-  database_pool_url?: string
-  database_pool_mode?: string
+  database_pool_url?: string | null
+  database_pool_mode?: string | null
   max_connections?: number
   jwt_secret: string
   jwks: { keys?: JwksConfigKey[] } | null
@@ -495,15 +495,15 @@ export default async function routes(fastify: FastifyInstance) {
         tenantInfo.feature_s3_protocol = features?.s3Protocol?.enabled
       }
 
-      if (databasePoolUrl) {
-        tenantInfo.database_pool_url = encrypt(databasePoolUrl)
+      if (databasePoolUrl !== undefined) {
+        tenantInfo.database_pool_url = databasePoolUrl === null ? null : encrypt(databasePoolUrl)
       }
 
       if (maxConnections) {
         tenantInfo.max_connections = Number(maxConnections)
       }
 
-      if (databasePoolMode) {
+      if (databasePoolMode !== undefined) {
         tenantInfo.database_pool_mode = databasePoolMode
       }
 
diff --git a/src/test/admin-tenants.test.ts b/src/test/admin-tenants.test.ts
index 33bd5de94..436445f2f 100644
--- a/src/test/admin-tenants.test.ts
+++ b/src/test/admin-tenants.test.ts
@@ -2,24 +2,35 @@ import * as migrations from '@internal/database/migrations'
 import { multitenantKnex } from '@internal/database/multitenant-db'
 import { adminApp } from './common'
 
-describe('admin tenant delete route', () => {
-  beforeAll(async () => {
-    await migrations.runMultitenantMigrations()
-  })
+const adminHeaders = {
+  apikey: process.env.ADMIN_API_KEYS!,
+  'content-type': 'application/json',
+}
 
-  afterAll(async () => {
-    await adminApp.close()
-    await multitenantKnex.destroy()
-  })
+const baseTenantBody = {
+  anonKey: 'anon',
+  databaseUrl: 'postgresql://postgres:postgres@127.0.0.1:5433/postgres',
+  jwtSecret: 'secret',
+  serviceKey: 'service',
+  jwks: null,
+  fileSizeLimit: 1024,
+}
+
+beforeAll(async () => {
+  await migrations.runMultitenantMigrations()
+})
 
+afterAll(async () => {
+  await adminApp.close()
+  await multitenantKnex.destroy()
+})
+
+describe('admin tenant delete route', () => {
   it('accepts an empty json delete request', async () => {
     const response = await adminApp.inject({
       method: 'DELETE',
       url: '/tenants/abc',
-      headers: {
-        apikey: process.env.ADMIN_API_KEYS!,
-        'content-type': 'application/json',
-      },
+      headers: adminHeaders,
       payload: '',
     })
 
@@ -27,3 +38,49 @@ describe('admin tenant delete route', () => {
     expect(response.body).toBe('')
   })
 })
+
+describe('admin tenant put route nullable pool fields', () => {
+  const tenantId = 'put-nullable-pool'
+
+  beforeAll(async () => {
+    await multitenantKnex('tenants').where('id', tenantId).delete()
+  })
+
+  afterAll(async () => {
+    await multitenantKnex('tenants').where('id', tenantId).delete()
+  })
+
+  it('clears database_pool_url and database_pool_mode when put with null', async () => {
+    const initial = await adminApp.inject({
+      method: 'PUT',
+      url: `/tenants/${tenantId}`,
+      headers: adminHeaders,
+      payload: JSON.stringify({
+        ...baseTenantBody,
+        databasePoolUrl: 'postgresql://postgres:postgres@127.0.0.1:6454/postgres',
+        databasePoolMode: 'transaction',
+      }),
+    })
+    expect(initial.statusCode).toBe(204)
+
+    const seeded = await multitenantKnex('tenants').first().where('id', tenantId)
+    expect(seeded?.database_pool_url).toBeTruthy()
+    expect(seeded?.database_pool_mode).toBe('transaction')
+
+    const cleared = await adminApp.inject({
+      method: 'PUT',
+      url: `/tenants/${tenantId}`,
+      headers: adminHeaders,
+      payload: JSON.stringify({
+        ...baseTenantBody,
+        databasePoolUrl: null,
+        databasePoolMode: null,
+      }),
+    })
+    expect(cleared.statusCode).toBe(204)
+
+    const after = await multitenantKnex('tenants').first().where('id', tenantId)
+    expect(after?.database_pool_url).toBeNull()
+    expect(after?.database_pool_mode).toBeNull()
+  })
+})