diff --git a/frontend/src/components/S3BackupConfigDrawer.tsx b/frontend/src/components/S3BackupConfigDrawer.tsx
index d11e3e1..153d77e 100644
--- a/frontend/src/components/S3BackupConfigDrawer.tsx
+++ b/frontend/src/components/S3BackupConfigDrawer.tsx
@@ -58,9 +58,11 @@ export default function S3BackupConfigDrawer({
       setOpen(false);
       toast.success("S3 backup configuration saved successfully");
     },
-    onError: (error: any) => {
+    onError: (error: Error & { response?: { data?: { detail?: string } } }) => {
       console.error("Failed to update S3 backup configuration:", error);
-      const message = error?.response?.data?.detail || "Failed to save S3 configuration. Please check your settings and try again.";
+      const message =
+        error?.response?.data?.detail ||
+        "Failed to save S3 configuration. Please check your settings and try again.";
       toast.error(message);
     },
   });
@@ -73,11 +75,15 @@ export default function S3BackupConfigDrawer({
       }),
     onSuccess: () => {
       console.log("S3 connection test successful");
-      toast.success("S3 connection test successful! Your configuration is working correctly.");
+      toast.success(
+        "S3 connection test successful! Your configuration is working correctly.",
+      );
     },
-    onError: (error: any) => {
+    onError: (error: Error & { response?: { data?: { detail?: string } } }) => {
       console.error("Failed to test S3 connection:", error);
-      const message = error?.response?.data?.detail || "S3 connection test failed. Please verify your credentials and settings.";
+      const message =
+        error?.response?.data?.detail ||
+        "S3 connection test failed. Please verify your credentials and settings.";
       toast.error(message);
     },
   });
@@ -98,9 +104,7 @@ export default function S3BackupConfigDrawer({
 
   return (
     <Drawer open={open} onOpenChange={setOpen}>
-      <DrawerTrigger asChild>
-        {trigger || <EditButton />}
-      </DrawerTrigger>
+      <DrawerTrigger asChild>{trigger || <EditButton />}</DrawerTrigger>
       <DrawerContent>
         <div className="mx-auto w-full max-w-sm">
           <DrawerHeader>
@@ -148,7 +152,10 @@ export default function S3BackupConfigDrawer({
                     type="password"
                     value={config.secret_access_key}
                     onChange={(e) =>
-                      setConfig({ ...config, secret_access_key: e.target.value })
+                      setConfig({
+                        ...config,
+                        secret_access_key: e.target.value,
+                      })
                     }
                     placeholder="Your AWS Secret Access Key"
                     required
@@ -212,15 +219,21 @@ export default function S3BackupConfigDrawer({
                   <Label htmlFor="path_style">Use path-style addressing</Label>
                 </div>
                 <p className="text-xs text-muted-foreground">
-                  Enable for older S3 implementations or certain S3-compatible services
+                  Enable for older S3 implementations or certain S3-compatible
+                  services
                 </p>
               </>
             )}
 
             <DrawerFooter className="px-0">
               <div className="flex space-x-2">
-                <Button type="submit" disabled={updateMutation.isPending || !config.enabled}>
-                  {updateMutation.isPending ? "Saving..." : "Save Configuration"}
+                <Button
+                  type="submit"
+                  disabled={updateMutation.isPending || !config.enabled}
+                >
+                  {updateMutation.isPending
+                    ? "Saving..."
+                    : "Save Configuration"}
                 </Button>
                 {config.enabled && isConfigValid && (
                   <Button
diff --git a/frontend/src/components/Settings.tsx b/frontend/src/components/Settings.tsx
index ea13550..030769c 100644
--- a/frontend/src/components/Settings.tsx
+++ b/frontend/src/components/Settings.tsx
@@ -203,8 +203,10 @@ export default function Settings() {
     }
   };
 
-  const isLoading = accountsLoading || settingsLoading || servicesLoading || backupLoading;
-  const hasError = accountsError || settingsError || servicesError || backupError;
+  const isLoading =
+    accountsLoading || settingsLoading || servicesLoading || backupLoading;
+  const hasError =
+    accountsError || settingsError || servicesError || backupError;
 
   if (isLoading) {
     return <AccountsSkeleton />;
@@ -757,7 +759,8 @@ export default function Settings() {
                 <span>S3 Backup Configuration</span>
               </CardTitle>
               <CardDescription>
-                Configure automatic database backups to Amazon S3 or S3-compatible storage
+                Configure automatic database backups to Amazon S3 or
+                S3-compatible storage
               </CardDescription>
             </CardHeader>
 
@@ -769,7 +772,8 @@ export default function Settings() {
                     No S3 backup configured
                   </h3>
                   <p className="text-muted-foreground mb-4">
-                    Set up S3 backup to automatically backup your database to the cloud.
+                    Set up S3 backup to automatically backup your database to
+                    the cloud.
                   </p>
                   <S3BackupConfigDrawer settings={backupSettings} />
                 </div>
@@ -786,26 +790,33 @@ export default function Settings() {
                             S3 Backup
                           </h4>
                           <div className="flex items-center space-x-2">
-                            <div className={`w-2 h-2 rounded-full ${
-                              backupSettings.s3.enabled
-                                ? 'bg-green-500'
-                                : 'bg-muted-foreground'
-                            }`} />
+                            <div
+                              className={`w-2 h-2 rounded-full ${
+                                backupSettings.s3.enabled
+                                  ? "bg-green-500"
+                                  : "bg-muted-foreground"
+                              }`}
+                            />
                             <span className="text-sm text-muted-foreground">
-                              {backupSettings.s3.enabled ? 'Enabled' : 'Disabled'}
+                              {backupSettings.s3.enabled
+                                ? "Enabled"
+                                : "Disabled"}
                             </span>
                           </div>
                         </div>
                         <div className="mt-2 space-y-1">
                           <p className="text-sm text-muted-foreground">
-                            <span className="font-medium">Bucket:</span> {backupSettings.s3.bucket_name}
+                            <span className="font-medium">Bucket:</span>{" "}
+                            {backupSettings.s3.bucket_name}
                           </p>
                           <p className="text-sm text-muted-foreground">
-                            <span className="font-medium">Region:</span> {backupSettings.s3.region}
+                            <span className="font-medium">Region:</span>{" "}
+                            {backupSettings.s3.region}
                           </p>
                           {backupSettings.s3.endpoint_url && (
                             <p className="text-sm text-muted-foreground">
-                              <span className="font-medium">Endpoint:</span> {backupSettings.s3.endpoint_url}
+                              <span className="font-medium">Endpoint:</span>{" "}
+                              {backupSettings.s3.endpoint_url}
                             </p>
                           )}
                         </div>
@@ -813,16 +824,17 @@ export default function Settings() {
                     </div>
                     <S3BackupConfigDrawer settings={backupSettings} />
                   </div>
-                  
+
                   <div className="p-4 bg-muted rounded-lg">
                     <h5 className="font-medium mb-2">Backup Information</h5>
                     <p className="text-sm text-muted-foreground mb-3">
-                      Database backups are stored in the "leggen_backups/" folder in your S3 bucket.
-                      Backups include the complete SQLite database file.
+                      Database backups are stored in the "leggen_backups/"
+                      folder in your S3 bucket. Backups include the complete
+                      SQLite database file.
                     </p>
                     <div className="flex space-x-2">
-                      <Button 
-                        size="sm" 
+                      <Button
+                        size="sm"
                         variant="outline"
                         onClick={() => {
                           // TODO: Implement manual backup trigger
@@ -831,8 +843,8 @@ export default function Settings() {
                       >
                         Create Backup Now
                       </Button>
-                      <Button 
-                        size="sm" 
+                      <Button
+                        size="sm"
                         variant="outline"
                         onClick={() => {
                           // TODO: Implement backup list view
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 3091553..236e9d0 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -281,9 +281,8 @@ export const apiClient = {
 
   // Backup endpoints
   getBackupSettings: async (): Promise<BackupSettings> => {
-    const response = await api.get<ApiResponse<BackupSettings>>(
-      "/backup/settings",
-    );
+    const response =
+      await api.get<ApiResponse<BackupSettings>>("/backup/settings");
     return response.data.data;
   },
 
diff --git a/frontend/src/routeTree.gen.ts b/frontend/src/routeTree.gen.ts
index 8e6b2a0..06d7d06 100644
--- a/frontend/src/routeTree.gen.ts
+++ b/frontend/src/routeTree.gen.ts
@@ -8,170 +8,170 @@
 // You should NOT make any changes in this file as it will be overwritten.
 // Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
 
-import { Route as rootRouteImport } from './routes/__root'
-import { Route as TransactionsRouteImport } from './routes/transactions'
-import { Route as SystemRouteImport } from './routes/system'
-import { Route as SettingsRouteImport } from './routes/settings'
-import { Route as NotificationsRouteImport } from './routes/notifications'
-import { Route as BankConnectedRouteImport } from './routes/bank-connected'
-import { Route as AnalyticsRouteImport } from './routes/analytics'
-import { Route as IndexRouteImport } from './routes/index'
+import { Route as rootRouteImport } from "./routes/__root";
+import { Route as TransactionsRouteImport } from "./routes/transactions";
+import { Route as SystemRouteImport } from "./routes/system";
+import { Route as SettingsRouteImport } from "./routes/settings";
+import { Route as NotificationsRouteImport } from "./routes/notifications";
+import { Route as BankConnectedRouteImport } from "./routes/bank-connected";
+import { Route as AnalyticsRouteImport } from "./routes/analytics";
+import { Route as IndexRouteImport } from "./routes/index";
 
 const TransactionsRoute = TransactionsRouteImport.update({
-  id: '/transactions',
-  path: '/transactions',
+  id: "/transactions",
+  path: "/transactions",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 const SystemRoute = SystemRouteImport.update({
-  id: '/system',
-  path: '/system',
+  id: "/system",
+  path: "/system",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 const SettingsRoute = SettingsRouteImport.update({
-  id: '/settings',
-  path: '/settings',
+  id: "/settings",
+  path: "/settings",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 const NotificationsRoute = NotificationsRouteImport.update({
-  id: '/notifications',
-  path: '/notifications',
+  id: "/notifications",
+  path: "/notifications",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 const BankConnectedRoute = BankConnectedRouteImport.update({
-  id: '/bank-connected',
-  path: '/bank-connected',
+  id: "/bank-connected",
+  path: "/bank-connected",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 const AnalyticsRoute = AnalyticsRouteImport.update({
-  id: '/analytics',
-  path: '/analytics',
+  id: "/analytics",
+  path: "/analytics",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 const IndexRoute = IndexRouteImport.update({
-  id: '/',
-  path: '/',
+  id: "/",
+  path: "/",
   getParentRoute: () => rootRouteImport,
-} as any)
+} as any);
 
 export interface FileRoutesByFullPath {
-  '/': typeof IndexRoute
-  '/analytics': typeof AnalyticsRoute
-  '/bank-connected': typeof BankConnectedRoute
-  '/notifications': typeof NotificationsRoute
-  '/settings': typeof SettingsRoute
-  '/system': typeof SystemRoute
-  '/transactions': typeof TransactionsRoute
+  "/": typeof IndexRoute;
+  "/analytics": typeof AnalyticsRoute;
+  "/bank-connected": typeof BankConnectedRoute;
+  "/notifications": typeof NotificationsRoute;
+  "/settings": typeof SettingsRoute;
+  "/system": typeof SystemRoute;
+  "/transactions": typeof TransactionsRoute;
 }
 export interface FileRoutesByTo {
-  '/': typeof IndexRoute
-  '/analytics': typeof AnalyticsRoute
-  '/bank-connected': typeof BankConnectedRoute
-  '/notifications': typeof NotificationsRoute
-  '/settings': typeof SettingsRoute
-  '/system': typeof SystemRoute
-  '/transactions': typeof TransactionsRoute
+  "/": typeof IndexRoute;
+  "/analytics": typeof AnalyticsRoute;
+  "/bank-connected": typeof BankConnectedRoute;
+  "/notifications": typeof NotificationsRoute;
+  "/settings": typeof SettingsRoute;
+  "/system": typeof SystemRoute;
+  "/transactions": typeof TransactionsRoute;
 }
 export interface FileRoutesById {
-  __root__: typeof rootRouteImport
-  '/': typeof IndexRoute
-  '/analytics': typeof AnalyticsRoute
-  '/bank-connected': typeof BankConnectedRoute
-  '/notifications': typeof NotificationsRoute
-  '/settings': typeof SettingsRoute
-  '/system': typeof SystemRoute
-  '/transactions': typeof TransactionsRoute
+  __root__: typeof rootRouteImport;
+  "/": typeof IndexRoute;
+  "/analytics": typeof AnalyticsRoute;
+  "/bank-connected": typeof BankConnectedRoute;
+  "/notifications": typeof NotificationsRoute;
+  "/settings": typeof SettingsRoute;
+  "/system": typeof SystemRoute;
+  "/transactions": typeof TransactionsRoute;
 }
 export interface FileRouteTypes {
-  fileRoutesByFullPath: FileRoutesByFullPath
+  fileRoutesByFullPath: FileRoutesByFullPath;
   fullPaths:
-    | '/'
-    | '/analytics'
-    | '/bank-connected'
-    | '/notifications'
-    | '/settings'
-    | '/system'
-    | '/transactions'
-  fileRoutesByTo: FileRoutesByTo
+    | "/"
+    | "/analytics"
+    | "/bank-connected"
+    | "/notifications"
+    | "/settings"
+    | "/system"
+    | "/transactions";
+  fileRoutesByTo: FileRoutesByTo;
   to:
-    | '/'
-    | '/analytics'
-    | '/bank-connected'
-    | '/notifications'
-    | '/settings'
-    | '/system'
-    | '/transactions'
+    | "/"
+    | "/analytics"
+    | "/bank-connected"
+    | "/notifications"
+    | "/settings"
+    | "/system"
+    | "/transactions";
   id:
-    | '__root__'
-    | '/'
-    | '/analytics'
-    | '/bank-connected'
-    | '/notifications'
-    | '/settings'
-    | '/system'
-    | '/transactions'
-  fileRoutesById: FileRoutesById
+    | "__root__"
+    | "/"
+    | "/analytics"
+    | "/bank-connected"
+    | "/notifications"
+    | "/settings"
+    | "/system"
+    | "/transactions";
+  fileRoutesById: FileRoutesById;
 }
 export interface RootRouteChildren {
-  IndexRoute: typeof IndexRoute
-  AnalyticsRoute: typeof AnalyticsRoute
-  BankConnectedRoute: typeof BankConnectedRoute
-  NotificationsRoute: typeof NotificationsRoute
-  SettingsRoute: typeof SettingsRoute
-  SystemRoute: typeof SystemRoute
-  TransactionsRoute: typeof TransactionsRoute
+  IndexRoute: typeof IndexRoute;
+  AnalyticsRoute: typeof AnalyticsRoute;
+  BankConnectedRoute: typeof BankConnectedRoute;
+  NotificationsRoute: typeof NotificationsRoute;
+  SettingsRoute: typeof SettingsRoute;
+  SystemRoute: typeof SystemRoute;
+  TransactionsRoute: typeof TransactionsRoute;
 }
 
-declare module '@tanstack/react-router' {
+declare module "@tanstack/react-router" {
   interface FileRoutesByPath {
-    '/transactions': {
-      id: '/transactions'
-      path: '/transactions'
-      fullPath: '/transactions'
-      preLoaderRoute: typeof TransactionsRouteImport
-      parentRoute: typeof rootRouteImport
-    }
-    '/system': {
-      id: '/system'
-      path: '/system'
-      fullPath: '/system'
-      preLoaderRoute: typeof SystemRouteImport
-      parentRoute: typeof rootRouteImport
-    }
-    '/settings': {
-      id: '/settings'
-      path: '/settings'
-      fullPath: '/settings'
-      preLoaderRoute: typeof SettingsRouteImport
-      parentRoute: typeof rootRouteImport
-    }
-    '/notifications': {
-      id: '/notifications'
-      path: '/notifications'
-      fullPath: '/notifications'
-      preLoaderRoute: typeof NotificationsRouteImport
-      parentRoute: typeof rootRouteImport
-    }
-    '/bank-connected': {
-      id: '/bank-connected'
-      path: '/bank-connected'
-      fullPath: '/bank-connected'
-      preLoaderRoute: typeof BankConnectedRouteImport
-      parentRoute: typeof rootRouteImport
-    }
-    '/analytics': {
-      id: '/analytics'
-      path: '/analytics'
-      fullPath: '/analytics'
-      preLoaderRoute: typeof AnalyticsRouteImport
-      parentRoute: typeof rootRouteImport
-    }
-    '/': {
-      id: '/'
-      path: '/'
-      fullPath: '/'
-      preLoaderRoute: typeof IndexRouteImport
-      parentRoute: typeof rootRouteImport
-    }
+    "/transactions": {
+      id: "/transactions";
+      path: "/transactions";
+      fullPath: "/transactions";
+      preLoaderRoute: typeof TransactionsRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
+    "/system": {
+      id: "/system";
+      path: "/system";
+      fullPath: "/system";
+      preLoaderRoute: typeof SystemRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
+    "/settings": {
+      id: "/settings";
+      path: "/settings";
+      fullPath: "/settings";
+      preLoaderRoute: typeof SettingsRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
+    "/notifications": {
+      id: "/notifications";
+      path: "/notifications";
+      fullPath: "/notifications";
+      preLoaderRoute: typeof NotificationsRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
+    "/bank-connected": {
+      id: "/bank-connected";
+      path: "/bank-connected";
+      fullPath: "/bank-connected";
+      preLoaderRoute: typeof BankConnectedRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
+    "/analytics": {
+      id: "/analytics";
+      path: "/analytics";
+      fullPath: "/analytics";
+      preLoaderRoute: typeof AnalyticsRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
+    "/": {
+      id: "/";
+      path: "/";
+      fullPath: "/";
+      preLoaderRoute: typeof IndexRouteImport;
+      parentRoute: typeof rootRouteImport;
+    };
   }
 }
 
@@ -183,7 +183,7 @@ const rootRouteChildren: RootRouteChildren = {
   SettingsRoute: SettingsRoute,
   SystemRoute: SystemRoute,
   TransactionsRoute: TransactionsRoute,
-}
+};
 export const routeTree = rootRouteImport
   ._addFileChildren(rootRouteChildren)
-  ._addFileTypes<FileRouteTypes>()
+  ._addFileTypes<FileRouteTypes>();
diff --git a/leggen/api/models/backup.py b/leggen/api/models/backup.py
index b701b5f..e852b62 100644
--- a/leggen/api/models/backup.py
+++ b/leggen/api/models/backup.py
@@ -7,32 +7,34 @@ from pydantic import BaseModel, Field
 
 class S3Config(BaseModel):
     """S3 backup configuration model for API."""
-    
+
     access_key_id: str = Field(..., description="AWS S3 access key ID")
     secret_access_key: str = Field(..., description="AWS S3 secret access key")
     bucket_name: str = Field(..., description="S3 bucket name")
     region: str = Field(default="us-east-1", description="AWS S3 region")
-    endpoint_url: Optional[str] = Field(default=None, description="Custom S3 endpoint URL")
+    endpoint_url: Optional[str] = Field(
+        default=None, description="Custom S3 endpoint URL"
+    )
     path_style: bool = Field(default=False, description="Use path-style addressing")
     enabled: bool = Field(default=True, description="Enable S3 backups")
 
 
 class BackupSettings(BaseModel):
     """Backup settings model for API."""
-    
+
     s3: Optional[S3Config] = None
 
 
 class BackupTest(BaseModel):
     """Backup connection test request model."""
-    
+
     service: str = Field(..., description="Backup service type (s3)")
     config: S3Config = Field(..., description="S3 configuration to test")
 
 
 class BackupInfo(BaseModel):
     """Backup file information model."""
-    
+
     key: str = Field(..., description="S3 object key")
     last_modified: str = Field(..., description="Last modified timestamp (ISO format)")
     size: int = Field(..., description="File size in bytes")
@@ -40,6 +42,8 @@ class BackupInfo(BaseModel):
 
 class BackupOperation(BaseModel):
     """Backup operation request model."""
-    
+
     operation: str = Field(..., description="Operation type (backup, restore)")
-    backup_key: Optional[str] = Field(default=None, description="Backup key for restore operations")
\ No newline at end of file
+    backup_key: Optional[str] = Field(
+        default=None, description="Backup key for restore operations"
+    )
diff --git a/leggen/api/routes/backup.py b/leggen/api/routes/backup.py
index 3f59f27..973fde1 100644
--- a/leggen/api/routes/backup.py
+++ b/leggen/api/routes/backup.py
@@ -1,6 +1,5 @@
 """API routes for backup management."""
 
-
 from fastapi import APIRouter, HTTPException
 from loguru import logger
 
@@ -24,10 +23,10 @@ async def get_backup_settings() -> APIResponse:
     """Get current backup settings."""
     try:
         backup_config = config.backup_config
-        
+
         # Build response safely without exposing secrets
         s3_config = backup_config.get("s3", {})
-        
+
         settings = BackupSettings(
             s3=S3Config(
                 access_key_id="***" if s3_config.get("access_key_id") else "",
@@ -41,13 +40,13 @@ async def get_backup_settings() -> APIResponse:
             if s3_config.get("bucket_name")
             else None,
         )
-        
+
         return APIResponse(
             success=True,
             data=settings,
             message="Backup settings retrieved successfully",
         )
-        
+
     except Exception as e:
         logger.error(f"Failed to get backup settings: {e}")
         raise HTTPException(
@@ -71,20 +70,20 @@ async def update_backup_settings(settings: BackupSettings) -> APIResponse:
                 path_style=settings.s3.path_style,
                 enabled=settings.s3.enabled,
             )
-            
+
             # Test connection
             backup_service = BackupService()
             connection_success = await backup_service.test_connection(s3_config)
-            
+
             if not connection_success:
                 raise HTTPException(
                     status_code=400,
-                    detail="S3 connection test failed. Please check your configuration."
+                    detail="S3 connection test failed. Please check your configuration.",
                 )
-        
+
         # Update backup config
         backup_config = {}
-        
+
         if settings.s3:
             backup_config["s3"] = {
                 "access_key_id": settings.s3.access_key_id,
@@ -95,17 +94,17 @@ async def update_backup_settings(settings: BackupSettings) -> APIResponse:
                 "path_style": settings.s3.path_style,
                 "enabled": settings.s3.enabled,
             }
-        
+
         # Save to config
         if backup_config:
             config.update_section("backup", backup_config)
-        
+
         return APIResponse(
             success=True,
             data={"updated": True},
             message="Backup settings updated successfully",
         )
-        
+
     except HTTPException:
         raise
     except Exception as e:
@@ -123,7 +122,7 @@ async def test_backup_connection(test_request: BackupTest) -> APIResponse:
             raise HTTPException(
                 status_code=400, detail="Only 's3' service is supported"
             )
-        
+
         # Convert API model to config model
         s3_config = S3BackupConfig(
             access_key_id=test_request.config.access_key_id,
@@ -134,10 +133,10 @@ async def test_backup_connection(test_request: BackupTest) -> APIResponse:
             path_style=test_request.config.path_style,
             enabled=test_request.config.enabled,
         )
-        
+
         backup_service = BackupService()
         success = await backup_service.test_connection(s3_config)
-        
+
         if success:
             return APIResponse(
                 success=True,
@@ -149,7 +148,7 @@ async def test_backup_connection(test_request: BackupTest) -> APIResponse:
                 success=False,
                 message="S3 connection test failed",
             )
-            
+
     except HTTPException:
         raise
     except Exception as e:
@@ -164,26 +163,26 @@ async def list_backups() -> APIResponse:
     """List available backups."""
     try:
         backup_config = config.backup_config.get("s3", {})
-        
+
         if not backup_config.get("bucket_name"):
             return APIResponse(
                 success=True,
                 data=[],
                 message="No S3 backup configuration found",
             )
-        
+
         # Convert config to model
         s3_config = S3BackupConfig(**backup_config)
         backup_service = BackupService(s3_config)
-        
+
         backups = await backup_service.list_backups()
-        
+
         return APIResponse(
             success=True,
             data=backups,
             message=f"Found {len(backups)} backups",
         )
-        
+
     except Exception as e:
         logger.error(f"Failed to list backups: {e}")
         raise HTTPException(
@@ -196,12 +195,10 @@ async def backup_operation(operation_request: BackupOperation) -> APIResponse:
     """Perform backup operation (backup or restore)."""
     try:
         backup_config = config.backup_config.get("s3", {})
-        
+
         if not backup_config.get("bucket_name"):
-            raise HTTPException(
-                status_code=400, detail="S3 backup is not configured"
-            )
-        
+            raise HTTPException(status_code=400, detail="S3 backup is not configured")
+
         # Convert config to model with validation
         try:
             s3_config = S3BackupConfig(**backup_config)
@@ -209,14 +206,14 @@ async def backup_operation(operation_request: BackupOperation) -> APIResponse:
             raise HTTPException(
                 status_code=400, detail=f"Invalid S3 configuration: {str(e)}"
             ) from e
-            
+
         backup_service = BackupService(s3_config)
-        
+
         if operation_request.operation == "backup":
             # Backup database
             database_path = path_manager.get_database_path()
             success = await backup_service.backup_database(database_path)
-            
+
             if success:
                 return APIResponse(
                     success=True,
@@ -228,19 +225,20 @@ async def backup_operation(operation_request: BackupOperation) -> APIResponse:
                     success=False,
                     message="Database backup failed",
                 )
-                
+
         elif operation_request.operation == "restore":
             if not operation_request.backup_key:
                 raise HTTPException(
-                    status_code=400, detail="backup_key is required for restore operation"
+                    status_code=400,
+                    detail="backup_key is required for restore operation",
                 )
-            
+
             # Restore database
             database_path = path_manager.get_database_path()
             success = await backup_service.restore_database(
                 operation_request.backup_key, database_path
             )
-            
+
             if success:
                 return APIResponse(
                     success=True,
@@ -256,11 +254,11 @@ async def backup_operation(operation_request: BackupOperation) -> APIResponse:
             raise HTTPException(
                 status_code=400, detail="Invalid operation. Use 'backup' or 'restore'"
             )
-            
+
     except HTTPException:
         raise
     except Exception as e:
         logger.error(f"Failed to perform backup operation: {e}")
         raise HTTPException(
             status_code=500, detail=f"Failed to perform backup operation: {str(e)}"
-        ) from e
\ No newline at end of file
+        ) from e
diff --git a/leggen/models/config.py b/leggen/models/config.py
index f3a8314..3dfa032 100644
--- a/leggen/models/config.py
+++ b/leggen/models/config.py
@@ -37,7 +37,9 @@ class S3BackupConfig(BaseModel):
     secret_access_key: str = Field(..., description="AWS S3 secret access key")
     bucket_name: str = Field(..., description="S3 bucket name")
     region: str = Field(default="us-east-1", description="AWS S3 region")
-    endpoint_url: Optional[str] = Field(default=None, description="Custom S3 endpoint URL")
+    endpoint_url: Optional[str] = Field(
+        default=None, description="Custom S3 endpoint URL"
+    )
     path_style: bool = Field(default=False, description="Use path-style addressing")
     enabled: bool = Field(default=True, description="Enable S3 backups")