diff --git a/core/src/App.vue b/core/src/App.vue
index c26ae6a..90f7a91 100644
--- a/core/src/App.vue
+++ b/core/src/App.vue
@@ -1,11 +1,13 @@
 <template>
   <RouterView></RouterView>
+  <SharedSnackbar />
 </template>
 
 <script setup lang="ts">
 import { RouterView } from 'vue-router';
 import { onMounted, watch } from 'vue';
 import { useTheme } from 'vuetify';
+import SharedSnackbar from '@KTXC/components/shared/SharedSnackbar.vue';
 import { useLayoutStore } from '@KTXC/stores/layoutStore';
 import { useUserStore } from '@KTXC/stores/userStore';
 import { useTenantStore } from '@KTXC/stores/tenantStore';
diff --git a/core/src/components/shared/SharedSnackbar.vue b/core/src/components/shared/SharedSnackbar.vue
new file mode 100644
index 0000000..38982d4
--- /dev/null
+++ b/core/src/components/shared/SharedSnackbar.vue
@@ -0,0 +1,29 @@
+<script setup lang="ts">
+import { useSnackbar } from '@KTXC/composables/useSnackbar'
+
+const {
+  snackbarVisible,
+  snackbarMessage,
+  snackbarColor,
+  snackbarTimeout,
+  hideSnackbar,
+} = useSnackbar()
+</script>
+
+<template>
+  <v-snackbar
+    :model-value="snackbarVisible"
+    :color="snackbarColor"
+    :timeout="snackbarTimeout"
+    location="bottom right"
+    @update:model-value="value => !value && hideSnackbar()"
+  >
+    {{ snackbarMessage }}
+
+    <template #actions>
+      <v-btn variant="text" @click="hideSnackbar()">
+        Close
+      </v-btn>
+    </template>
+  </v-snackbar>
+</template>
\ No newline at end of file
diff --git a/core/src/composables/useSnackbar.ts b/core/src/composables/useSnackbar.ts
index 5b4a3c9..b6113d0 100644
--- a/core/src/composables/useSnackbar.ts
+++ b/core/src/composables/useSnackbar.ts
@@ -2,7 +2,7 @@
  * Simple snackbar/toast notification composable
  * Uses Vuetify's snackbar component
  */
-import { ref } from 'vue'
+import { nextTick, ref } from 'vue'
 
 export interface SnackbarOptions {
   message: string
@@ -10,21 +10,60 @@ export interface SnackbarOptions {
   timeout?: number
 }
 
+interface SnackbarState {
+  message: string
+  color: string
+  timeout: number
+}
+
 const snackbarVisible = ref(false)
 const snackbarMessage = ref('')
 const snackbarColor = ref<string>('info')
 const snackbarTimeout = ref(3000)
+const snackbarQueue = ref<SnackbarState[]>([])
+
+function showNextSnackbar() {
+  if (snackbarVisible.value || snackbarQueue.value.length === 0) {
+    return
+  }
+
+  const nextSnackbar = snackbarQueue.value.shift()
+
+  if (!nextSnackbar) {
+    return
+  }
+
+  snackbarMessage.value = nextSnackbar.message
+  snackbarColor.value = nextSnackbar.color
+  snackbarTimeout.value = nextSnackbar.timeout
+  snackbarVisible.value = true
+}
 
 export function useSnackbar() {
   const showSnackbar = (options: SnackbarOptions) => {
-    snackbarMessage.value = options.message
-    snackbarColor.value = options.color || 'info'
-    snackbarTimeout.value = options.timeout || 3000
-    snackbarVisible.value = true
+    
+    const notification = {
+      message: options.message,
+      color: options.color || 'info',
+      timeout: options.timeout || 3000,
+    }
+
+    if (!snackbarVisible.value && snackbarQueue.value.length === 0) {
+      snackbarMessage.value = notification.message
+      snackbarColor.value = notification.color
+      snackbarTimeout.value = notification.timeout
+      snackbarVisible.value = true
+      return
+    }
+
+    snackbarQueue.value = [...snackbarQueue.value, notification]
   }
 
   const hideSnackbar = () => {
     snackbarVisible.value = false
+    void nextTick(() => {
+      showNextSnackbar()
+    })
   }
 
   return {
@@ -32,6 +71,7 @@ export function useSnackbar() {
     snackbarMessage,
     snackbarColor,
     snackbarTimeout,
+    snackbarQueue,
     showSnackbar,
     hideSnackbar,
   }
diff --git a/core/src/shared/index.ts b/core/src/shared/index.ts
index 34d4fb9..6df6a8d 100644
--- a/core/src/shared/index.ts
+++ b/core/src/shared/index.ts
@@ -16,6 +16,7 @@ export { useLayoutStore } from '../stores/layoutStore'
 // Composables
 export { useUser } from '../composables/useUser'
 export { useClipboard } from '../composables/useClipboard'
+export { useSnackbar } from '../composables/useSnackbar'
 
 // Services
 export { userService } from '../services/user/userService'
diff --git a/shared/lib/Resource/Documents/Service/ServiceBaseInterface.php b/shared/lib/Resource/Documents/Service/ServiceBaseInterface.php
index eb1a293..063d641 100644
--- a/shared/lib/Resource/Documents/Service/ServiceBaseInterface.php
+++ b/shared/lib/Resource/Documents/Service/ServiceBaseInterface.php
@@ -132,7 +132,7 @@ interface ServiceBaseInterface extends ResourceServiceBaseInterface {
     public function entityList(string|int|null $collection, ?IFilter $filter = null, ?ISort $sort = null, ?IRange $range = null, ?array $properties = null): array;
 
     /**
-     * Creates a filter builder for messages
+     * Creates a filter builder for entities
      *
      * @since 2025.05.01
      *
@@ -141,7 +141,7 @@ interface ServiceBaseInterface extends ResourceServiceBaseInterface {
     public function entityListFilter(): IFilter;
 
     /**
-     * Creates a sort builder for messages
+     * Creates a sort builder for entities
      *
      * @since 2025.05.01
      *
@@ -150,7 +150,7 @@ interface ServiceBaseInterface extends ResourceServiceBaseInterface {
     public function entityListSort(): ISort;
 
     /**
-     * Creates a range builder for messages
+     * Creates a range builder for entities
      *
      * @since 2025.05.01
      *
@@ -209,4 +209,50 @@ interface ServiceBaseInterface extends ResourceServiceBaseInterface {
      */
     public function entityRead(string|int|null $collection, string|int $identifier): ?string;
 
+    /**
+     * Lists messages in a collection
+     *
+     * @since 2025.05.01
+     *
+     * @param string|int|null $collection Collection ID
+     * @param IFilter|null $filter Optional filter criteria
+     * @param ISort|null $sort Optional sort order
+     * @param IRange|null $range Optional pagination
+     * @param array|null $properties Optional message properties to fetch
+     *
+     * @return array<string|int,CollectionBaseInterface|EntityBaseInterface> Nodes indexed by ID
+     */
+    public function nodeList(string|int|null $collection, bool $recursive = false, ?IFilter $filter = null, ?ISort $sort = null, ?IRange $range = null, ?array $properties = null): array;
+
+    /**
+     * Creates a filter builder for nodes
+     *
+     * @since 2025.05.01
+     *
+     * @return IFilter
+     */
+    public function nodeListFilter(): IFilter;
+
+    /**
+     * Creates a sort builder for nodes
+     *
+     * @since 2025.05.01
+     *
+     * @return ISort
+     */
+    public function nodeListSort(): ISort;
+
+    /**
+     * Gets incremental changes since last sync
+     *
+     * @since 2025.05.01
+     *
+     * @param string|int|null $collection Collection ID
+     * @param string $signature Sync token from previous sync
+     * @param string $detail Detail level: 'ids', 'minimal', 'full'
+     *
+     * @return array ['signature' => string, 'added' => array, 'modified' => array, 'removed' => array]
+     */
+    public function nodeDelta(string|int|null $collection, string $signature, string $detail = 'ids'): Delta;
+
 }
diff --git a/shared/lib/Resource/Documents/Service/ServiceMutableInterface.php b/shared/lib/Resource/Documents/Service/ServiceMutableInterface.php
index e2cc5ee..1b67e2c 100644
--- a/shared/lib/Resource/Documents/Service/ServiceMutableInterface.php
+++ b/shared/lib/Resource/Documents/Service/ServiceMutableInterface.php
@@ -9,14 +9,16 @@ declare(strict_types=1);
 
 namespace KTXF\Resource\Documents\Service;
 
+use KTXF\Resource\Provider\ResourceServiceMutateInterface;
+
 /**
- * Chrono Service Mutable Interface
+ * Documents Service Mutable Interface
  * 
  * Extends base service interface with setter methods for mutable properties.
  * Used for service configuration and updates.
  * 
  * @since 2025.05.01
  */
-interface ServiceMutableInterface extends ServiceBaseInterface {
+interface ServiceMutableInterface extends ServiceBaseInterface, ResourceServiceMutateInterface {
 
 }