diff --git a/lib/core/ui/querya_icon_sizes.dart b/lib/core/ui/querya_icon_sizes.dart
index 6a9e48d..58c66d8 100644
--- a/lib/core/ui/querya_icon_sizes.dart
+++ b/lib/core/ui/querya_icon_sizes.dart
@@ -9,6 +9,12 @@ abstract final class QueryaIconSizes {
   /// Expand chevron in tree rows.
   static const double treeExpand = 13;
 
+  /// Expand chevron on connection / folder headers in the sidebar (#496).
+  static const double sidebarExpand = 16;
+
+  /// Connection-type icon / logo on sidebar header rows.
+  static const double sidebarConnectionIcon = 16;
+
   /// Database / connection-level tree nodes.
   static const double treeConnection = 14;
 
diff --git a/lib/features/connections/connections_panel_extension.dart b/lib/features/connections/connections_panel_extension.dart
index 0507777..8890294 100644
--- a/lib/features/connections/connections_panel_extension.dart
+++ b/lib/features/connections/connections_panel_extension.dart
@@ -141,25 +141,25 @@ class _ExtensionConnectionTileState extends State<_ExtensionConnectionTile> {
     if (_iconFilePath != null) {
       iconWidget = DriverIconImage(
         path: _iconFilePath!,
-        size: 16,
+        size: QueryaIconSizes.sidebarConnectionIcon,
         fallbackIcon: widget.icon,
       );
     } else if (widget.iconAsset != null) {
       iconWidget = material.Image.asset(
         widget.iconAsset!,
-        width: 16,
-        height: 16,
+        width: QueryaIconSizes.sidebarConnectionIcon,
+        height: QueryaIconSizes.sidebarConnectionIcon,
         fit: material.BoxFit.contain,
         errorBuilder: (_, __, ___) => material.Icon(
           widget.icon,
-          size: 16,
+          size: QueryaIconSizes.sidebarConnectionIcon,
           color: theme.colorScheme.primary,
         ),
       );
     } else {
       iconWidget = material.Icon(
         widget.icon,
-        size: 16,
+        size: QueryaIconSizes.sidebarConnectionIcon,
         color: theme.colorScheme.primary,
       );
     }
@@ -185,7 +185,7 @@ class _ExtensionConnectionTileState extends State<_ExtensionConnectionTile> {
                       curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                       child: material.Icon(
                         QueryaIcons.expandClosed,
-                        size: 16,
+                        size: QueryaIconSizes.sidebarExpand,
                         color: theme.colorScheme.mutedForeground,
                       ),
                     ),
diff --git a/lib/features/connections/connections_panel_mongo.dart b/lib/features/connections/connections_panel_mongo.dart
index a1193b3..db1f4f8 100644
--- a/lib/features/connections/connections_panel_mongo.dart
+++ b/lib/features/connections/connections_panel_mongo.dart
@@ -142,17 +142,18 @@ class _MongoConnectionTileState extends State<_MongoConnectionTile> {
     final iconWidget = widget.iconAsset != null
         ? material.Image.asset(
             widget.iconAsset!,
-            width: 16,
-            height: 16,
+            width: QueryaIconSizes.sidebarConnectionIcon,
+            height: QueryaIconSizes.sidebarConnectionIcon,
             fit: material.BoxFit.contain,
             errorBuilder: (_, __, ___) => material.Icon(
               widget.icon,
-              size: 16,
+              size: QueryaIconSizes.sidebarConnectionIcon,
               color: theme.colorScheme.primary,
             ),
           )
         : material.Icon(widget.icon,
-            size: 16, color: theme.colorScheme.primary);
+            size: QueryaIconSizes.sidebarConnectionIcon,
+            color: theme.colorScheme.primary);
 
     return ContextMenu(
       items: [
@@ -200,8 +201,8 @@ class _MongoConnectionTileState extends State<_MongoConnectionTile> {
                         duration: context.motionDuration(QueryaMotion.treeExpand),
                         curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                         child: material.Icon(
-                          material.Icons.chevron_right_rounded,
-                          size: 16,
+                          QueryaIcons.expandClosed,
+                          size: QueryaIconSizes.sidebarExpand,
                           color: theme.colorScheme.mutedForeground,
                         ),
                       ),
diff --git a/lib/features/connections/connections_panel_mysql.dart b/lib/features/connections/connections_panel_mysql.dart
index 069001b..41f5b5d 100644
--- a/lib/features/connections/connections_panel_mysql.dart
+++ b/lib/features/connections/connections_panel_mysql.dart
@@ -107,17 +107,18 @@ class _MysqlConnectionTileState extends State<_MysqlConnectionTile> {
     final iconWidget = widget.iconAsset != null
         ? material.Image.asset(
             widget.iconAsset!,
-            width: 16,
-            height: 16,
+            width: QueryaIconSizes.sidebarConnectionIcon,
+            height: QueryaIconSizes.sidebarConnectionIcon,
             fit: material.BoxFit.contain,
             errorBuilder: (_, __, ___) => material.Icon(
               widget.icon,
-              size: 16,
+              size: QueryaIconSizes.sidebarConnectionIcon,
               color: theme.colorScheme.primary,
             ),
           )
         : material.Icon(widget.icon,
-            size: 16, color: theme.colorScheme.primary);
+            size: QueryaIconSizes.sidebarConnectionIcon,
+            color: theme.colorScheme.primary);
 
     return ContextMenu(
       items: [
@@ -166,7 +167,7 @@ class _MysqlConnectionTileState extends State<_MysqlConnectionTile> {
                         curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                         child: material.Icon(
                           QueryaIcons.expandClosed,
-                          size: 16,
+                          size: QueryaIconSizes.sidebarExpand,
                           color: theme.colorScheme.mutedForeground,
                         ),
                       ),
diff --git a/lib/features/connections/connections_panel_postgres_connection.dart b/lib/features/connections/connections_panel_postgres_connection.dart
index ec01f98..f592e3c 100644
--- a/lib/features/connections/connections_panel_postgres_connection.dart
+++ b/lib/features/connections/connections_panel_postgres_connection.dart
@@ -110,17 +110,18 @@ class _PostgresConnectionTileState extends State<_PostgresConnectionTile> {
     final iconWidget = widget.iconAsset != null
         ? material.Image.asset(
             widget.iconAsset!,
-            width: 16,
-            height: 16,
+            width: QueryaIconSizes.sidebarConnectionIcon,
+            height: QueryaIconSizes.sidebarConnectionIcon,
             fit: material.BoxFit.contain,
             errorBuilder: (_, __, ___) => material.Icon(
               widget.icon,
-              size: 16,
+              size: QueryaIconSizes.sidebarConnectionIcon,
               color: theme.colorScheme.primary,
             ),
           )
         : material.Icon(widget.icon,
-            size: 16, color: theme.colorScheme.primary);
+            size: QueryaIconSizes.sidebarConnectionIcon,
+            color: theme.colorScheme.primary);
 
     return ContextMenu(
       items: [
@@ -160,8 +161,8 @@ class _PostgresConnectionTileState extends State<_PostgresConnectionTile> {
                         duration: context.motionDuration(QueryaMotion.treeExpand),
                         curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                         child: material.Icon(
-                          material.Icons.chevron_right_rounded,
-                          size: 16,
+                          QueryaIcons.expandClosed,
+                          size: QueryaIconSizes.sidebarExpand,
                           color: theme.colorScheme.mutedForeground,
                         ),
                       ),
diff --git a/lib/features/connections/connections_panel_redis.dart b/lib/features/connections/connections_panel_redis.dart
index 472ae2d..cdb0aa4 100644
--- a/lib/features/connections/connections_panel_redis.dart
+++ b/lib/features/connections/connections_panel_redis.dart
@@ -125,17 +125,18 @@ class _RedisConnectionTileState extends State<_RedisConnectionTile> {
     final iconWidget = widget.iconAsset != null
         ? material.Image.asset(
             widget.iconAsset!,
-            width: 16,
-            height: 16,
+            width: QueryaIconSizes.sidebarConnectionIcon,
+            height: QueryaIconSizes.sidebarConnectionIcon,
             fit: material.BoxFit.contain,
             errorBuilder: (_, __, ___) => material.Icon(
               widget.icon,
-              size: 16,
+              size: QueryaIconSizes.sidebarConnectionIcon,
               color: theme.colorScheme.primary,
             ),
           )
         : material.Icon(widget.icon,
-            size: 16, color: theme.colorScheme.primary);
+            size: QueryaIconSizes.sidebarConnectionIcon,
+            color: theme.colorScheme.primary);
 
     return ContextMenu(
       items: [
@@ -177,8 +178,8 @@ class _RedisConnectionTileState extends State<_RedisConnectionTile> {
                         duration: context.motionDuration(QueryaMotion.treeExpand),
                         curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                         child: material.Icon(
-                          material.Icons.chevron_right_rounded,
-                          size: 16,
+                          QueryaIcons.expandClosed,
+                          size: QueryaIconSizes.sidebarExpand,
                           color: theme.colorScheme.mutedForeground,
                         ),
                       ),
diff --git a/lib/features/connections/connections_panel_sidebar.dart b/lib/features/connections/connections_panel_sidebar.dart
index f8ba2a1..9822994 100644
--- a/lib/features/connections/connections_panel_sidebar.dart
+++ b/lib/features/connections/connections_panel_sidebar.dart
@@ -91,16 +91,20 @@ class _ConnectionTile extends StatelessWidget {
     final iconWidget = iconAsset != null
         ? material.Image.asset(
             iconAsset!,
-            width: 16,
-            height: 16,
+            width: QueryaIconSizes.sidebarConnectionIcon,
+            height: QueryaIconSizes.sidebarConnectionIcon,
             fit: material.BoxFit.contain,
             errorBuilder: (_, __, ___) => material.Icon(
               icon,
-              size: 16,
+              size: QueryaIconSizes.sidebarConnectionIcon,
               color: theme.colorScheme.primary,
             ),
           )
-        : material.Icon(icon, size: 16, color: theme.colorScheme.primary);
+        : material.Icon(
+            icon,
+            size: QueryaIconSizes.sidebarConnectionIcon,
+            color: theme.colorScheme.primary,
+          );
     return ContextMenu(
       items: [
         MenuButton(
@@ -256,14 +260,15 @@ class _FolderTileState extends State<_FolderTile> {
                         duration: context.motionDuration(QueryaMotion.treeExpand),
                         curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                         child: material.Icon(
-                          material.Icons.chevron_right_rounded,
-                          size: 18,
+                          QueryaIcons.expandClosed,
+                          size: QueryaIconSizes.sidebarExpand,
                           color: theme.colorScheme.mutedForeground,
                         ),
                       ),
                       const Gap(2),
-                      material.Icon(material.Icons.folder_rounded,
-                          size: 18, color: theme.colorScheme.primary),
+                      material.Icon(QueryaIcons.folder,
+                          size: QueryaIconSizes.sidebarConnectionIcon,
+                          color: theme.colorScheme.primary),
                       const Gap(8),
                       material.Expanded(
                         child: material.Text(
diff --git a/lib/features/connections/connections_panel_sqlite.dart b/lib/features/connections/connections_panel_sqlite.dart
index 767fcb7..50db826 100644
--- a/lib/features/connections/connections_panel_sqlite.dart
+++ b/lib/features/connections/connections_panel_sqlite.dart
@@ -111,17 +111,18 @@ class _SqliteConnectionTileState extends State<_SqliteConnectionTile> {
     final iconWidget = widget.iconAsset != null
         ? material.Image.asset(
             widget.iconAsset!,
-            width: 16,
-            height: 16,
+            width: QueryaIconSizes.sidebarConnectionIcon,
+            height: QueryaIconSizes.sidebarConnectionIcon,
             fit: material.BoxFit.contain,
             errorBuilder: (_, __, ___) => material.Icon(
               widget.icon,
-              size: 16,
+              size: QueryaIconSizes.sidebarConnectionIcon,
               color: theme.colorScheme.primary,
             ),
           )
         : material.Icon(widget.icon,
-            size: 16, color: theme.colorScheme.primary);
+            size: QueryaIconSizes.sidebarConnectionIcon,
+            color: theme.colorScheme.primary);
 
     return ContextMenu(
       items: [
@@ -173,7 +174,7 @@ class _SqliteConnectionTileState extends State<_SqliteConnectionTile> {
                         curve: context.motionCurve(QueryaMotion.treeExpandCurve),
                         child: material.Icon(
                           QueryaIcons.expandClosed,
-                          size: 16,
+                          size: QueryaIconSizes.sidebarExpand,
                           color: theme.colorScheme.mutedForeground,
                         ),
                       ),
diff --git a/test/core/ui/querya_icons_test.dart b/test/core/ui/querya_icons_test.dart
index 7f93df8..20025fa 100644
--- a/test/core/ui/querya_icons_test.dart
+++ b/test/core/ui/querya_icons_test.dart
@@ -79,8 +79,16 @@ void main() {
     });
   });
 
-  test('tree size tokens are ordered leaf < group < sdui', () {
+  test('tree size tokens are ordered leaf < group < connection < sidebar', () {
     expect(QueryaIconSizes.treeLeaf, lessThan(QueryaIconSizes.treeGroup));
-    expect(QueryaIconSizes.treeGroup, lessThan(QueryaIconSizes.sduiNode));
+    expect(QueryaIconSizes.treeGroup, lessThan(QueryaIconSizes.treeConnection));
+    expect(
+      QueryaIconSizes.treeExpand,
+      lessThan(QueryaIconSizes.sidebarExpand),
+    );
+    expect(
+      QueryaIconSizes.sidebarExpand,
+      QueryaIconSizes.sidebarConnectionIcon,
+    );
   });
 }