diff --git a/scripts/analyze.py b/scripts/analyze.py
index 8ac7c30..fe7b818 100644
--- a/scripts/analyze.py
+++ b/scripts/analyze.py
@@ -105,7 +105,9 @@ def hits(domain: Optional[str] = typer.Option(None, help="Filter by domain")) ->
 
 
 @app.command("cache-ratio")
-def cache_ratio_cmd(domain: Optional[str] = typer.Option(None, help="Filter by domain")) -> None:
+def cache_ratio_cmd(
+    domain: Optional[str] = typer.Option(None, help="Filter by domain")
+) -> None:
     """Display cache hit ratio as a percentage."""
     ratio = get_cache_ratio(domain) * 100
     if domain:
@@ -115,7 +117,11 @@ def cache_ratio_cmd(domain: Optional[str] = typer.Option(None, help="Filter by d
 
 
 @app.command("check-missing-domains")
-def check_missing_domains(json_output: bool = typer.Option(False, "--json", help="Output missing domains as JSON")) -> None:
+def check_missing_domains(
+    json_output: bool = typer.Option(
+        False, "--json", help="Output missing domains as JSON"
+    )
+) -> None:
     """Show domains present in the database but absent from Nginx config."""
     try:
         from scripts.generate_reports import _get_domains as _db_domains
@@ -151,9 +157,7 @@ def check_missing_domains(json_output: bool = typer.Option(False, "--json", help
 
 @app.command("suggest-cache")
 def suggest_cache(
-    threshold: int = typer.Option(
-        10, help="Minimum number of MISS entries to report"
-    ),
+    threshold: int = typer.Option(10, help="Minimum number of MISS entries to report"),
     json_output: bool = typer.Option(False, "--json", help="Output results as JSON"),
 ) -> None:
     """Suggest domain/path pairs that could benefit from caching.
@@ -211,9 +215,7 @@ def suggest_cache(
 @app.command("detect-threats")
 def detect_threats(
     hours: int = typer.Option(1, help="Number of recent hours to analyze"),
-    ip_threshold: int = typer.Option(
-        100, help="Requests from a single IP to flag"
-    ),
+    ip_threshold: int = typer.Option(100, help="Requests from a single IP to flag"),
 ) -> None:
     """Detect potential security threats from recent logs."""
 
@@ -316,9 +318,7 @@ def detect_threats(
         """,
         (recent_start_s, recent_end_s, ip_threshold),
     )
-    high_ip_requests = [
-        {"ip": ip, "requests": cnt} for ip, cnt in cur.fetchall()
-    ]
+    high_ip_requests = [{"ip": ip, "requests": cnt} for ip, cnt in cur.fetchall()]
 
     conn.close()
 
diff --git a/scripts/init_db.py b/scripts/init_db.py
index f378b5c..b9ea07d 100644
--- a/scripts/init_db.py
+++ b/scripts/init_db.py
@@ -61,7 +61,9 @@ try:
             suffix = match.group(1)
             number = int(suffix.lstrip(".")) if suffix else 0
             log_files.append((number, os.path.join(LOG_DIR, f)))
-    log_files = [path for _, path in sorted(log_files, key=lambda x: x[0], reverse=True)]
+    log_files = [
+        path for _, path in sorted(log_files, key=lambda x: x[0], reverse=True)
+    ]
 except FileNotFoundError:
     print(f"[ERROR] Log directory not found: {LOG_DIR}")
     exit(1)
diff --git a/scripts/nginx_config.py b/scripts/nginx_config.py
index dbd635d..bc585a7 100644
--- a/scripts/nginx_config.py
+++ b/scripts/nginx_config.py
@@ -93,4 +93,3 @@ def parse_servers(paths: Set[Path]) -> List[Dict[str, str]]:
                 entry["root"] = " ".join(directives["root"])
             servers.append(entry)
     return servers
-
diff --git a/templates/index.html b/templates/index.html
index b1cbf89..84c6214 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -180,6 +180,10 @@
       });
     }
 
+    function destroyAllCharts() {
+      Object.values(containers).forEach(destroyCharts);
+    }
+
     function loadReports() {
       let path;
       let container;
@@ -296,6 +300,7 @@
     }
 
     function switchTab(name) {
+      destroyAllCharts();
       currentTab = name;
       tabs.forEach(tab => {
         tab.classList.toggle('is-active', tab.dataset.tab === name);
diff --git a/tests/test_importer.py b/tests/test_importer.py
index 349786b..38c9be9 100644
--- a/tests/test_importer.py
+++ b/tests/test_importer.py
@@ -15,10 +15,10 @@ def sample_logs(tmp_path):
     log_dir.mkdir(parents=True, exist_ok=True)
 
     (log_dir / "access.log.1").write_text(
-        "127.0.0.1 - example.com [01/Jan/2024:10:00:00 +0000] \"GET / HTTP/1.1\" 200 123 \"-\" \"curl\" MISS\n"
+        '127.0.0.1 - example.com [01/Jan/2024:10:00:00 +0000] "GET / HTTP/1.1" 200 123 "-" "curl" MISS\n'
     )
     (log_dir / "access.log").write_text(
-        "127.0.0.1 - example.com [01/Jan/2024:10:05:00 +0000] \"GET /about HTTP/1.1\" 200 123 \"-\" \"curl\" MISS\n"
+        '127.0.0.1 - example.com [01/Jan/2024:10:05:00 +0000] "GET /about HTTP/1.1" 200 123 "-" "curl" MISS\n'
     )
 
     yield log_dir
@@ -59,4 +59,3 @@ def test_idempotent_import(sample_logs, tmp_path):
 
     assert first_count == 2
     assert second_count == first_count
-
diff --git a/tests/test_nginx_config.py b/tests/test_nginx_config.py
index 782c635..a6494a7 100644
--- a/tests/test_nginx_config.py
+++ b/tests/test_nginx_config.py
@@ -67,4 +67,3 @@ server {
     assert servers[1]["server_name"] == "example.org"
     assert servers[1]["listen"] == "443 ssl"
     assert "proxy_cache" not in servers[1]
-
diff --git a/tests/test_run_analysis.py b/tests/test_run_analysis.py
index 66d00df..fad7953 100644
--- a/tests/test_run_analysis.py
+++ b/tests/test_run_analysis.py
@@ -14,7 +14,7 @@ def test_script_invokes_commands(tmp_path):
 
     calls = tmp_path / "calls.txt"
     python_stub = tmp_path / "python"
-    python_stub.write_text(f"#!/usr/bin/env bash\necho \"$*\" >> \"{calls}\"\n")
+    python_stub.write_text(f'#!/usr/bin/env bash\necho "$*" >> "{calls}"\n')
     python_stub.chmod(0o755)
     (tmp_path / "python3").write_text(f"#!/usr/bin/env bash\nexit 0\n")
     (tmp_path / "python3").chmod(0o755)