diff --git a/backend/src/media_library_viewer_api/models/backups.py b/backend/src/media_library_viewer_api/models/backups.py
index 8b4cba7..6cb2f59 100644
--- a/backend/src/media_library_viewer_api/models/backups.py
+++ b/backend/src/media_library_viewer_api/models/backups.py
@@ -1,5 +1,6 @@
 from datetime import datetime
 from typing import Any
+
 from pydantic import BaseModel, Field, field_validator
 
 
diff --git a/backend/src/media_library_viewer_api/services/backup_alert_engine.py b/backend/src/media_library_viewer_api/services/backup_alert_engine.py
index 800e270..53b0c4f 100644
--- a/backend/src/media_library_viewer_api/services/backup_alert_engine.py
+++ b/backend/src/media_library_viewer_api/services/backup_alert_engine.py
@@ -24,7 +24,10 @@ def generate_alerts_for_run(
     # 2. Anomaly size alert
     bytes_transferred = run.get("bytes_transferred")
     if bytes_transferred is not None and previous_runs:
-        successful_runs = [r for r in previous_runs if r["status"] == "success" and r.get("bytes_transferred") is not None]
+        successful_runs = [
+            r for r in previous_runs
+            if r["status"] == "success" and r.get("bytes_transferred") is not None
+        ]
         if len(successful_runs) >= 3:
             sizes = [r["bytes_transferred"] for r in successful_runs[-7:]]
             median_size = statistics.median(sizes)
@@ -44,7 +47,10 @@ def generate_alerts_for_run(
                         "run_id": run["id"],
                         "alert_type": "anomaly_size",
                         "severity": "warning",
-                        "message": f"Backup job '{job_name}' size anomaly: {bytes_transferred} bytes (median: {median_size})",
+                        "message": (
+                            f"Backup job '{job_name}' size anomaly: "
+                            f"{bytes_transferred} bytes (median: {median_size})"
+                        ),
                     })
 
     # 3. Anomaly duration alert
@@ -60,7 +66,10 @@ def generate_alerts_for_run(
                     "run_id": run["id"],
                     "alert_type": "anomaly_duration",
                     "severity": "warning",
-                    "message": f"Backup job '{job_name}' duration anomaly: {duration_ms}ms (median: {median_duration}ms)",
+                    "message": (
+                        f"Backup job '{job_name}' duration anomaly: "
+                        f"{duration_ms}ms (median: {median_duration}ms)"
+                    ),
                 })
 
     return alerts
@@ -105,7 +114,10 @@ def check_missed_schedules(
                         "run_id": None,
                         "alert_type": "missed_schedule",
                         "severity": "warning",
-                        "message": f"Backup job '{job['name']}' missed schedule: last run at {last_run_time} (expected every {interval}s)",
+                        "message": (
+                        f"Backup job '{job['name']}' missed schedule: "
+                        f"last run at {last_run_time} (expected every {interval}s)"
+                    ),
                     })
 
     return alerts
diff --git a/frontend/src/api/backups.ts b/frontend/src/api/backups.ts
index dcf24cb..1a7e229 100644
--- a/frontend/src/api/backups.ts
+++ b/frontend/src/api/backups.ts
@@ -1,4 +1,4 @@
-import {
+import type {
     BackupAlert,
     BackupDashboardSummary,
     BackupJob,
diff --git a/frontend/src/components/BackupAlertsTable.tsx b/frontend/src/components/BackupAlertsTable.tsx
index f0c1e5b..f971ff3 100644
--- a/frontend/src/components/BackupAlertsTable.tsx
+++ b/frontend/src/components/BackupAlertsTable.tsx
@@ -1,5 +1,5 @@
 import { Button, Chip, Paper, Table, TableBody, TableCell, TableContainer, TableHead, TableRow } from "@mui/material";
-import { BackupAlert } from "../types/backups";
+import type { BackupAlert } from "../types/backups";
 
 interface Props {
     alerts: BackupAlert[];
diff --git a/frontend/src/components/BackupJobsTable.tsx b/frontend/src/components/BackupJobsTable.tsx
index a2b00e2..fe5b3e8 100644
--- a/frontend/src/components/BackupJobsTable.tsx
+++ b/frontend/src/components/BackupJobsTable.tsx
@@ -8,7 +8,7 @@ import {
     TableHead,
     TableRow,
 } from "@mui/material";
-import { BackupJob, BackupRun } from "../types/backups";
+import type { BackupJob, BackupRun } from "../types/backups";
 
 interface Props {
     jobs: BackupJob[];
diff --git a/frontend/src/components/BackupRunsTable.tsx b/frontend/src/components/BackupRunsTable.tsx
index 3c9624d..34b4b18 100644
--- a/frontend/src/components/BackupRunsTable.tsx
+++ b/frontend/src/components/BackupRunsTable.tsx
@@ -13,7 +13,7 @@ import {
     TableRow,
 } from "@mui/material";
 import { useState } from "react";
-import { BackupRun } from "../types/backups";
+import type { BackupRun } from "../types/backups";
 
 interface Props {
     runs: BackupRun[];