diff --git a/api/ovdashboard_api/async_helpers.py b/api/ovdashboard_api/async_helpers.py
index ecda7a4..b87af70 100644
--- a/api/ovdashboard_api/async_helpers.py
+++ b/api/ovdashboard_api/async_helpers.py
@@ -9,9 +9,7 @@ from typing import Awaitable, Callable, TypeVar
 RT = TypeVar("RT")
 
 
-def run_in_executor(
-    function: Callable[..., RT]
-) -> Callable[..., Awaitable[RT]]:
+def run_in_executor(function: Callable[..., RT]) -> Callable[..., Awaitable[RT]]:
     """
     Decorator to make blocking a function call asyncio compatible.
     https://stackoverflow.com/questions/41063331/how-to-use-asyncio-with-existing-blocking-library/
diff --git a/api/ovdashboard_api/dav_calendar.py b/api/ovdashboard_api/dav_calendar.py
index ab824be..5b69462 100644
--- a/api/ovdashboard_api/dav_calendar.py
+++ b/api/ovdashboard_api/dav_calendar.py
@@ -22,17 +22,6 @@ from .dav_common import caldav_principal
 from .settings import SETTINGS
 
 _logger = getLogger(__name__)
-
-
-def _string_strip(in_str: str) -> str:
-    """
-    Wrapper for str.strip().
-
-    Used to define `pydantic` validators.
-    """
-    return in_str.strip()
-
-
 StrippedStr = Annotated[str, AfterValidator(lambda s: s.strip())]
 
 
diff --git a/api/ovdashboard_api/dav_common.py b/api/ovdashboard_api/dav_common.py
index 08e2f05..48357c2 100644
--- a/api/ovdashboard_api/dav_common.py
+++ b/api/ovdashboard_api/dav_common.py
@@ -18,12 +18,14 @@ from . import __file__ as OVD_INIT
 from .async_helpers import run_in_executor
 from .settings import SETTINGS
 
-_WEBDAV_CLIENT = WebDAVclient({
-    "webdav_hostname":  SETTINGS.webdav.url,
-    "webdav_login":     SETTINGS.webdav.username,
-    "webdav_password":  SETTINGS.webdav.password,
-    "disable_check":    SETTINGS.webdav_disable_check,
-})
+_WEBDAV_CLIENT = WebDAVclient(
+    {
+        "webdav_hostname": SETTINGS.webdav.url,
+        "webdav_login": SETTINGS.webdav.username,
+        "webdav_password": SETTINGS.webdav.password,
+        "disable_check": SETTINGS.webdav_disable_check,
+    }
+)
 
 _logger = getLogger(__name__)
 
@@ -113,11 +115,13 @@ def webdav_ensure_files(remote_path: str, *file_names: str) -> None:
     missing_files = (
         file_name
         for file_name in file_names
-        if not _WEBDAV_CLIENT.check(path.join(
-            SETTINGS.webdav_prefix,
-            remote_path,
-            file_name,
-        ))
+        if not _WEBDAV_CLIENT.check(
+            path.join(
+                SETTINGS.webdav_prefix,
+                remote_path,
+                file_name,
+            )
+        )
     )
 
     webdav_upload_skel(
@@ -132,9 +136,7 @@ def webdav_resource(remote_path: Any) -> WebDAVResource:
     Gets a resource using the main WebDAV client.
     """
 
-    return _WEBDAV_CLIENT.resource(
-        f"{SETTINGS.webdav_prefix}/{remote_path}"
-    )
+    return _WEBDAV_CLIENT.resource(f"{SETTINGS.webdav_prefix}/{remote_path}")
 
 
 @run_in_executor
@@ -143,9 +145,7 @@ def webdav_list(remote_path: str) -> list[str]:
     Asynchronously lists a WebDAV path using the main WebDAV client.
     """
 
-    return _WEBDAV_CLIENT.list(
-        f"{SETTINGS.webdav_prefix}/{remote_path}"
-    )
+    return _WEBDAV_CLIENT.list(f"{SETTINGS.webdav_prefix}/{remote_path}")
 
 
 _CALDAV_CLIENT = CalDAVclient(
@@ -169,7 +169,4 @@ def caldav_list() -> Iterator[str]:
     Asynchronously lists all calendars using the main WebDAV client.
     """
 
-    return (
-        str(cal.name)
-        for cal in caldav_principal().calendars()
-    )
+    return (str(cal.name) for cal in caldav_principal().calendars())
diff --git a/api/ovdashboard_api/routers/v1/_common.py b/api/ovdashboard_api/routers/v1/_common.py
index 09fe1b5..efd2435 100644
--- a/api/ovdashboard_api/routers/v1/_common.py
+++ b/api/ovdashboard_api/routers/v1/_common.py
@@ -63,11 +63,7 @@ class FileNameLister:
         try:
             file_names = await webdav_list(await self.remote_path)
 
-            return (
-                name
-                for name in file_names
-                if self.re.search(name)
-            )
+            return (name for name in file_names if self.re.search(name))
 
         except RemoteResourceNotFound:
             _logger.error(
@@ -115,8 +111,7 @@ class PrefixFinder:
         return {
             **_RESPONSE_OK,
             status.HTTP_404_NOT_FOUND: {
-                "description": "Failure in lister " +
-                repr(self.lister.__class__.__name__),
+                "description": f"Failure in lister {self.lister.__class__.__name__!r}",
                 "content": None,
             },
         }
diff --git a/api/ovdashboard_api/routers/v1/aggregate.py b/api/ovdashboard_api/routers/v1/aggregate.py
index fdf21ee..a07403c 100644
--- a/api/ovdashboard_api/routers/v1/aggregate.py
+++ b/api/ovdashboard_api/routers/v1/aggregate.py
@@ -10,6 +10,7 @@ from logging import getLogger
 from typing import Iterator
 
 from fastapi import APIRouter, Depends
+
 from ovdashboard_api.config import Config
 
 from ...dav_calendar import CalEvent, DavCalendar
@@ -52,12 +53,13 @@ async def get_aggregate_calendar(
     aggregate = cfg.calendar.aggregates[name]
 
     calendars = (
-        DavCalendar(await calendar_unique(cal_prefix))
-        for cal_prefix in aggregate
+        DavCalendar(await calendar_unique(cal_prefix)) for cal_prefix in aggregate
     )
 
-    return sorted([
-        event
-        async for calendar in calendars  # type: ignore
-        for event in (await calendar.events)
-    ])
+    return sorted(
+        [
+            event
+            async for calendar in calendars  # type: ignore
+            for event in (await calendar.events)
+        ]
+    )
diff --git a/api/ovdashboard_api/routers/v1/file.py b/api/ovdashboard_api/routers/v1/file.py
index efd9114..10418bd 100644
--- a/api/ovdashboard_api/routers/v1/file.py
+++ b/api/ovdashboard_api/routers/v1/file.py
@@ -88,7 +88,5 @@ async def get_file(
     return StreamingResponse(
         content=buffer,
         media_type=mime,
-        headers={
-            "Content-Disposition": f"filename={prefix}"
-        },
+        headers={"Content-Disposition": f"filename={prefix}"},
     )
diff --git a/api/ovdashboard_api/routers/v1/image.py b/api/ovdashboard_api/routers/v1/image.py
index fc89d24..d613829 100644
--- a/api/ovdashboard_api/routers/v1/image.py
+++ b/api/ovdashboard_api/routers/v1/image.py
@@ -83,11 +83,7 @@ async def get_image(
     cfg = await Config.get()
 
     dav_file = DavFile(f"{await image_lister.remote_path}/{name}")
-    img = Image.open(
-        BytesIO(await dav_file.as_bytes)
-    ).convert(
-        cfg.image.mode
-    )
+    img = Image.open(BytesIO(await dav_file.as_bytes)).convert(cfg.image.mode)
 
     img_buffer = BytesIO()
     img.save(img_buffer, **cfg.image.save_params)
@@ -96,9 +92,7 @@ async def get_image(
     return StreamingResponse(
         content=img_buffer,
         media_type="image/jpeg",
-        headers={
-            "Content-Disposition": f"filename={prefix}.jpg"
-        },
+        headers={"Content-Disposition": f"filename={prefix}.jpg"},
     )
 
 
diff --git a/api/ovdashboard_api/routers/v1/ticker.py b/api/ovdashboard_api/routers/v1/ticker.py
index 85cecf8..98b07e0 100644
--- a/api/ovdashboard_api/routers/v1/ticker.py
+++ b/api/ovdashboard_api/routers/v1/ticker.py
@@ -42,11 +42,7 @@ async def get_ticker_lines() -> Iterator[str]:
         f"{await text_lister.remote_path}/{file_name}",
     ).as_string
 
-    return (
-        line.strip()
-        for line in ticker.split("\n")
-        if line.strip()
-    )
+    return (line.strip() for line in ticker.split("\n") if line.strip())
 
 
 async def get_ticker_content_lines(
@@ -55,9 +51,7 @@ async def get_ticker_content_lines(
     cfg = await Config.get()
 
     return (
-        line
-        for line in ticker_lines
-        if not line.startswith(cfg.ticker.comment_marker)
+        line for line in ticker_lines if not line.startswith(cfg.ticker.comment_marker)
     )
 
 
diff --git a/api/ovdashboard_api/settings.py b/api/ovdashboard_api/settings.py
index db42f46..51720e5 100644
--- a/api/ovdashboard_api/settings.py
+++ b/api/ovdashboard_api/settings.py
@@ -7,7 +7,7 @@ Converts per-run (environment) variables and config files into the
 Pydantic models might have convenience methods attached.
 """
 
-from typing import Any, Optional
+from typing import Any
 
 from pydantic import BaseModel, root_validator
 from pydantic_settings import BaseSettings
@@ -18,11 +18,11 @@ class DavSettings(BaseModel):
     Connection to a DAV server.
     """
 
-    protocol: Optional[str] = None
-    host: Optional[str] = None
-    username: Optional[str] = None
-    password: Optional[str] = None
-    path: Optional[str] = None
+    protocol: str | None = None
+    host: str | None = None
+    username: str | None = None
+    password: str | None = None
+    path: str | None = None
 
     @property
     def url(self) -> str:
@@ -57,8 +57,8 @@ class Settings(BaseSettings):
     #####
 
     openapi_url: str = "/openapi.json"
-    docs_url: Optional[str] = None if production_mode else "/docs"
-    redoc_url: Optional[str] = None if production_mode else "/redoc"
+    docs_url: str | None = None if production_mode else "/docs"
+    redoc_url: str | None = None if production_mode else "/redoc"
 
     #####
     # webdav settings