diff --git a/README.md b/README.md
index 55b5111..8570103 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ It is possible to customize the `default` preset or define your own Database pre
 NUXT_PUBLIC_SURREALDB_DATABASES_PRODUCTION_HOST="https://example.com"
 NUXT_PUBLIC_SURREALDB_DATABASES_PRODUCTION_NS="surrealdb"
 NUXT_PUBLIC_SURREALDB_DATABASES_PRODUCTION_DB="docs"
+NUXT_PUBLIC_SURREALDB_DATABASES_PRODUCTION_SC="user"
 
 # For auth
 # user and pass separated by a colon
diff --git a/playground/app.vue b/playground/app.vue
index 73d7bf3..9b242bf 100644
--- a/playground/app.vue
+++ b/playground/app.vue
@@ -108,9 +108,6 @@ const { signin, signout, session, refreshInfo } = useSurrealAuth()
 interface UserCredentials {
   username?: string
   password?: string
-  SC: string
 }
-const credentials = reactive<UserCredentials>({
-  SC: 'user',
-})
+const credentials = reactive<UserCredentials>({})
 </script>
diff --git a/playground/nuxt.config.ts b/playground/nuxt.config.ts
index 801f479..8b7497b 100644
--- a/playground/nuxt.config.ts
+++ b/playground/nuxt.config.ts
@@ -9,6 +9,7 @@ export default defineNuxtConfig({
         host: '',
         NS: '',
         DB: '',
+        SC: '',
         auth: '',
       },
     },
diff --git a/src/module.ts b/src/module.ts
index 349aefd..ec140e7 100644
--- a/src/module.ts
+++ b/src/module.ts
@@ -30,6 +30,7 @@ export default defineNuxtModule<ModuleOptions>({
         host: '',
         NS: '',
         DB: '',
+        SC: '',
         auth: '',
       },
     },
diff --git a/src/runtime/composables/surreal-auth.ts b/src/runtime/composables/surreal-auth.ts
index e7ff027..a185d51 100644
--- a/src/runtime/composables/surreal-auth.ts
+++ b/src/runtime/composables/surreal-auth.ts
@@ -1,4 +1,6 @@
 import type { PublicRuntimeConfig } from 'nuxt/schema'
+import { defu } from 'defu'
+
 import type { RpcParams } from '../types'
 
 import type { UserSession } from '#surreal-auth'
@@ -53,14 +55,18 @@ export function useSurrealAuth() {
   }
 
   // signin
-  async function signin(credentials: Omit<RpcParams<any, 'signin'>[0], 'NS' | 'DB'>) {
-    const { NS, DB } = databases[authDatabase]
-    const { SC, ...crd } = credentials
+  async function signin(credentials: RpcParams<any, 'signin'>[0]) {
+    const _credentials = defu(
+      credentials,
+      {
+        NS: databases[authDatabase].NS,
+        DB: databases[authDatabase].DB,
+        SC: databases[authDatabase].SC,
+      },
+    )
+    if (!_credentials.NS || !_credentials.DB || !_credentials.SC) throw createError({ statusCode: 500, message: 'Invalid database preset' })
     const { result } = await $signin<string>({
-      ...crd,
-      NS,
-      DB,
-      SC,
+      ..._credentials,
     }, { database: authDatabase, token: false })
     if (result) {
       token.value = result
@@ -70,19 +76,23 @@ export function useSurrealAuth() {
   }
 
   // signup
-  async function signup(credentials: Omit<RpcParams<any, 'signup'>[0], 'NS' | 'DB'>) {
-    const { NS, DB } = databases[authDatabase]
-    const { SC, ...crd } = credentials
+  async function signup(credentials: RpcParams<any, 'signup'>[0]) {
+    const _credentials = defu(
+      credentials,
+      {
+        NS: databases[authDatabase].NS,
+        DB: databases[authDatabase].DB,
+        SC: databases[authDatabase].SC,
+      },
+    )
+    if (!_credentials.NS || !_credentials.DB || !_credentials.SC) throw createError({ statusCode: 500, message: 'Invalid database preset' })
     const { result } = await $signup<string>({
-      ...crd,
-      NS,
-      DB,
-      SC,
+      ..._credentials,
     }, { database: authDatabase, token: false })
     if (result) {
       token.value = result
       refreshCookie(cookieName)
-      await signin({ ...crd, SC })
+      await signin(_credentials)
       await refreshInfo()
     }
   }
diff --git a/src/runtime/types/index.d.ts b/src/runtime/types/index.d.ts
index cf71d5d..28c1de0 100644
--- a/src/runtime/types/index.d.ts
+++ b/src/runtime/types/index.d.ts
@@ -20,6 +20,7 @@ export interface DatabasePreset {
   host?: string
   NS?: string
   DB?: string
+  SC?: string
   auth?: AuthToken
 }