diff --git a/src/ccma/rules/scripts/birthdate_check.py b/src/ccma/rules/scripts/birthdate_check.py
index eccba3f..09674f4 100644
--- a/src/ccma/rules/scripts/birthdate_check.py
+++ b/src/ccma/rules/scripts/birthdate_check.py
@@ -1,5 +1,5 @@
-from ccma.domain.models import HOUSEKEEPER_MEMBER_FIELD_LABELS
 from ccma.domain.dates import DateValidationError, validate_member_dates
+from ccma.domain.models import HOUSEKEEPER_MEMBER_FIELD_LABELS
 from ccma.rules.api import RuleContext, task
 
 RULE_ID = "birthdate-check"
diff --git a/src/ccma/rules/scripts/contribution_claims.py b/src/ccma/rules/scripts/contribution_claims.py
index 0920fe7..18590d3 100644
--- a/src/ccma/rules/scripts/contribution_claims.py
+++ b/src/ccma/rules/scripts/contribution_claims.py
@@ -44,7 +44,11 @@ def evaluate(context: RuleContext):
                 )
             )
 
-    year_from = started_at.year if getattr(context.settings, "retroactive_claims", False) else context.today.year
+    year_from = (
+        started_at.year
+        if getattr(context.settings, "retroactive_claims", False)
+        else context.today.year
+    )
     for year in range(year_from, context.today.year + 2):
         actions.extend(_membership_claims(context, started_at, accepted_at, year))
     return actions
diff --git a/src/ccma/storage/atomic.py b/src/ccma/storage/atomic.py
index 196b69f..18536e5 100644
--- a/src/ccma/storage/atomic.py
+++ b/src/ccma/storage/atomic.py
@@ -11,7 +11,11 @@ CONTENT_HASH_FIELD = "content_hash"
 
 def _hashable_copy(data: Any, *, hash_field: str = CONTENT_HASH_FIELD) -> Any:
     if isinstance(data, dict):
-        return {key: _hashable_copy(value, hash_field=hash_field) for key, value in data.items() if key != hash_field}
+        return {
+            key: _hashable_copy(value, hash_field=hash_field)
+            for key, value in data.items()
+            if key != hash_field
+        }
     if isinstance(data, list):
         return [_hashable_copy(item, hash_field=hash_field) for item in data]
     return data
diff --git a/src/ccma/storage/repository.py b/src/ccma/storage/repository.py
index c976197..5ae599a 100644
--- a/src/ccma/storage/repository.py
+++ b/src/ccma/storage/repository.py
@@ -20,7 +20,14 @@ from ccma.domain.contributions import (
     payment_allocated_total,
 )
 from ccma.domain.dates import DateValidationError, normalize_date_input, validate_member_dates
-from ccma.domain.models import ASSET_STATUS_LABELS, MEMBERSHIP_STATUS_LABELS, Asset, ContributionData, Event, Member
+from ccma.domain.models import (
+    ASSET_STATUS_LABELS,
+    MEMBERSHIP_STATUS_LABELS,
+    Asset,
+    ContributionData,
+    Event,
+    Member,
+)
 from ccma.storage.atomic import json_content_hash_matches, read_json, write_json_atomic
 
 
@@ -143,7 +150,9 @@ class MemberRepository:
         try:
             config = read_json(self.root / "repository.json")
             if not json_content_hash_matches(config):
-                errors.append("repository.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert.")
+                errors.append(
+                    "repository.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert."
+                )
             if int(config.get("schema_version", 0)) != 1:
                 errors.append("repository.json: nicht unterstützte schema_version")
             policy = config.get("member_number_policy") or {}
@@ -157,7 +166,10 @@ class MemberRepository:
         for member_dir in self._member_directories():
             try:
                 member, _contributions = self.preflight_member_record(member_dir.name)
-                errors.extend(f"{member_dir.name}/{warning}" for warning in self.member_hash_warnings(member_dir.name))
+                errors.extend(
+                    f"{member_dir.name}/{warning}"
+                    for warning in self.member_hash_warnings(member_dir.name)
+                )
                 validate_member_dates(
                     birth_date=member.birth_date,
                     accepted_at=member.accepted_at,
@@ -186,12 +198,16 @@ class MemberRepository:
         for asset_dir in self._asset_directories():
             try:
                 asset = self.get_asset(asset_dir.name)
-                errors.extend(f"{asset_dir.name}/{warning}" for warning in self.asset_hash_warnings(asset_dir.name))
+                errors.extend(
+                    f"{asset_dir.name}/{warning}"
+                    for warning in self.asset_hash_warnings(asset_dir.name)
+                )
                 if asset.asset_id != asset_dir.name:
                     errors.append(f"{asset_dir.name}/asset.json: asset_id stimmt nicht mit Ordner überein")
                 if asset.schema_version != 1:
                     errors.append(
-                        f"{asset_dir.name}/asset.json: nicht unterstützte schema_version {asset.schema_version}"
+                        f"{asset_dir.name}/asset.json: "
+                        f"nicht unterstützte schema_version {asset.schema_version}"
                     )
                 if asset.status not in ASSET_STATUS_LABELS:
                     errors.append(f"{asset_dir.name}/asset.json: ungültiger Asset-Status")
@@ -425,7 +441,9 @@ class MemberRepository:
             existing.current_holder_member_id
             and money_text(deposit_amount) != str(existing.deposit_amount_default)
         ):
-            raise RepositoryError("Die Kaution kann nur geändert werden, wenn das Asset nicht ausgegeben ist.")
+            raise RepositoryError(
+                "Die Kaution kann nur geändert werden, wenn das Asset nicht ausgegeben ist."
+            )
         asset.label = asset.label.strip()
         asset.category = asset.category.strip()
         asset.inventory_number = asset.inventory_number.strip()
@@ -1220,14 +1238,17 @@ class MemberRepository:
         try:
             member_raw = read_json(self._member_path(member_id) / "member.json")
             if not json_content_hash_matches(member_raw):
-                warnings.append("member.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert.")
+                warnings.append(
+                    "member.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert."
+                )
         except (OSError, ValueError, TypeError, json.JSONDecodeError):
             pass
         try:
             contributions_raw = read_json(self._member_path(member_id) / "contributions.json")
             if not json_content_hash_matches(contributions_raw):
                 warnings.append(
-                    "contributions.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert."
+                    "contributions.json: Hash fehlt oder stimmt nicht; "
+                    "Datei wurde vermutlich extern geändert."
                 )
         except (OSError, ValueError, TypeError, json.JSONDecodeError):
             pass
@@ -1238,7 +1259,9 @@ class MemberRepository:
         try:
             asset_raw = read_json(self._asset_path(asset_id) / "asset.json")
             if not json_content_hash_matches(asset_raw):
-                warnings.append("asset.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert.")
+                warnings.append(
+                    "asset.json: Hash fehlt oder stimmt nicht; Datei wurde vermutlich extern geändert."
+                )
         except (OSError, ValueError, TypeError, json.JSONDecodeError):
             pass
         return warnings
diff --git a/src/ccma/ui/asset_tab.py b/src/ccma/ui/asset_tab.py
index 0779f04..8b98abd 100644
--- a/src/ccma/ui/asset_tab.py
+++ b/src/ccma/ui/asset_tab.py
@@ -5,7 +5,7 @@ from collections.abc import Callable
 from datetime import datetime
 from tkinter import messagebox, ttk
 
-from ccma.domain.models import ASSET_STATUS_LABELS, Asset, Event
+from ccma.domain.models import ASSET_STATUS_LABELS, Event
 from ccma.storage.repository import MemberRepository, RepositoryError
 from ccma.ui.dialogs import AssetClaimDialog, IntegrityWarningDialog
 from ccma.ui.messages import MessageAction, MessageBannerList, TabMessage
@@ -196,8 +196,16 @@ class AssetTab(ttk.Frame):
         ttk.Button(finance_actions, text="Verlustforderung", command=self._create_loss_claim).pack(
             side="left", padx=(0, 8)
         )
-        ttk.Button(finance_actions, text="Reparaturforderung", command=self._create_repair_claim).pack(side="left")
-        self.asset_claims = ttk.Treeview(finance_tab, columns=("title", "due", "amount", "member"), show="headings")
+        ttk.Button(
+            finance_actions,
+            text="Reparaturforderung",
+            command=self._create_repair_claim,
+        ).pack(side="left")
+        self.asset_claims = ttk.Treeview(
+            finance_tab,
+            columns=("title", "due", "amount", "member"),
+            show="headings",
+        )
         for key, title, width in (
             ("title", "Forderung", 240),
             ("due", "Fällig", 110),
@@ -429,7 +437,14 @@ class AssetTab(ttk.Frame):
             claim_type="asset_repair",
         )
 
-    def _open_claim_dialog(self, *, preset_title: str, preset_amount: str, preset_description: str, claim_type: str) -> None:
+    def _open_claim_dialog(
+        self,
+        *,
+        preset_title: str,
+        preset_amount: str,
+        preset_description: str,
+        claim_type: str,
+    ) -> None:
         member_id = self.asset.current_holder_member_id
         if not member_id:
             messagebox.showerror(
diff --git a/src/ccma/ui/claim_tab.py b/src/ccma/ui/claim_tab.py
index 2117755..97e0263 100644
--- a/src/ccma/ui/claim_tab.py
+++ b/src/ccma/ui/claim_tab.py
@@ -261,12 +261,26 @@ class ClaimTab(ttk.Frame):
             for allocation in self.data.allocations
             if str(allocation.get("claim_id", "")) == self.claim_id and str(allocation.get("credit_id", ""))
         ]
+        allocated_credit_total = money_text(
+            sum(
+                (decimal_value(item.get("amount", "0")) for item in credit_allocations),
+                Decimal("0"),
+            )
+        )
         credit_group = self.ledger.insert(
             "",
             "end",
             iid="group:credits",
             text=f"Gutschriften ({len(credit_allocations)})",
-            values=("", "", "", "", f"{money_text(sum((decimal_value(item.get('amount', '0')) for item in credit_allocations), Decimal('0')))} EUR", "", ""),
+            values=(
+                "",
+                "",
+                "",
+                "",
+                f"{allocated_credit_total} EUR",
+                "",
+                "",
+            ),
             tags=("credit-group",),
             open=True,
         )
diff --git a/src/ccma/ui/dialogs.py b/src/ccma/ui/dialogs.py
index 1146736..246ef7e 100644
--- a/src/ccma/ui/dialogs.py
+++ b/src/ccma/ui/dialogs.py
@@ -1,8 +1,7 @@
 import tkinter as tk
 from collections.abc import Callable
-from tkinter import messagebox, ttk
-
 from datetime import date
+from tkinter import messagebox, ttk
 
 from ccma.domain.dates import age_label, date_input_hint
 from ccma.domain.models import Asset, Member
@@ -35,7 +34,15 @@ class NewMemberDialog(tk.Toplevel):
         self.number_policy = repository.get_member_number_policy()
         self.variables = {
             name: tk.StringVar()
-            for name in ("first_name", "last_name", "nickname", "email", "phone", "birth_date", "member_number")
+            for name in (
+                "first_name",
+                "last_name",
+                "nickname",
+                "email",
+                "phone",
+                "birth_date",
+                "member_number",
+            )
         }
         self._build_ui()
         self.bind("<Escape>", lambda _event: self.destroy())
@@ -145,13 +152,24 @@ class NewAssetDialog(tk.Toplevel):
             entry = ttk.Entry(frame, textvariable=self.variables[key], width=38)
             entry.grid(row=row, column=1, sticky="ew", pady=5)
             self.entries[key] = entry
-        ttk.Label(frame, text="Interne Notiz").grid(row=len(fields), column=0, sticky="nw", pady=5, padx=(0, 12))
+        ttk.Label(frame, text="Interne Notiz").grid(
+            row=len(fields),
+            column=0,
+            sticky="nw",
+            pady=5,
+            padx=(0, 12),
+        )
         self.notes_text = tk.Text(frame, width=38, height=5, wrap="word")
         self.notes_text.grid(row=len(fields), column=1, sticky="ew", pady=5)
         buttons = ttk.Frame(frame)
         buttons.grid(row=len(fields) + 1, column=0, columnspan=2, sticky="e", pady=(16, 0))
         ttk.Button(buttons, text="Abbrechen", command=self.destroy).pack(side="left", padx=(0, 8))
-        ttk.Button(buttons, text="Asset anlegen", style="Accent.TButton", command=self._create).pack(side="left")
+        ttk.Button(
+            buttons,
+            text="Asset anlegen",
+            style="Accent.TButton",
+            command=self._create,
+        ).pack(side="left")
         self.after_idle(lambda: self.entries["label"].focus_set())
 
     def _activate_modal(self) -> None:
@@ -171,7 +189,13 @@ class NewAssetDialog(tk.Toplevel):
 
 
 class EditAssetDialog(tk.Toplevel):
-    def __init__(self, master: tk.Misc, repository: MemberRepository, asset_id: str, on_saved: Callable[[Asset], None]):
+    def __init__(
+        self,
+        master: tk.Misc,
+        repository: MemberRepository,
+        asset_id: str,
+        on_saved: Callable[[Asset], None],
+    ):
         super().__init__(master)
         self.repository = repository
         self.asset_id = asset_id
@@ -310,7 +334,12 @@ class IssueAssetDialog(tk.Toplevel):
         frame.rowconfigure(3, weight=1)
         asset = self.repository.get_asset(self.asset_id)
         ttk.Label(frame, text="Asset").grid(row=0, column=0, sticky="w", pady=5, padx=(0, 12))
-        ttk.Label(frame, text=asset.label, style="TimelineHeader.TLabel").grid(row=0, column=1, sticky="w", pady=5)
+        ttk.Label(frame, text=asset.label, style="TimelineHeader.TLabel").grid(
+            row=0,
+            column=1,
+            sticky="w",
+            pady=5,
+        )
         ttk.Label(frame, text="Suche").grid(row=1, column=0, sticky="w", pady=5, padx=(0, 12))
         self.search_entry = ttk.Entry(frame, textvariable=self.search_var, width=42)
         self.search_entry.grid(row=1, column=1, sticky="ew", pady=5)
@@ -378,7 +407,11 @@ class IssueAssetDialog(tk.Toplevel):
             )
         selected_id = self.preselected_member_id if self.preselected_member_id else ""
         if filtered:
-            target_id = selected_id if selected_id and any(member.member_id == selected_id for member in filtered) else filtered[0].member_id
+            target_id = (
+                selected_id
+                if selected_id and any(member.member_id == selected_id for member in filtered)
+                else filtered[0].member_id
+            )
             self.member_tree.selection_set(target_id)
             self.member_tree.focus(target_id)
             self.member_tree.see(target_id)
@@ -457,7 +490,12 @@ class AssetClaimDialog(tk.Toplevel):
         asset = self.repository.get_asset(self.asset_id)
         member = self.repository.get_member(self.member_id)
         ttk.Label(frame, text="Asset").grid(row=0, column=0, sticky="w", pady=5, padx=(0, 12))
-        ttk.Label(frame, text=asset.label, style="TimelineHeader.TLabel").grid(row=0, column=1, sticky="w", pady=5)
+        ttk.Label(frame, text=asset.label, style="TimelineHeader.TLabel").grid(
+            row=0,
+            column=1,
+            sticky="w",
+            pady=5,
+        )
         ttk.Label(frame, text="Mitglied").grid(row=1, column=0, sticky="w", pady=5, padx=(0, 12))
         ttk.Label(frame, text=f"{member.member_number or member.member_id} · {member.display_name}").grid(
             row=1, column=1, sticky="w", pady=5
@@ -470,11 +508,23 @@ class AssetClaimDialog(tk.Toplevel):
                 (f"Fällig am ({date_input_hint()}) *", "due_date"),
             )
         ):
-            ttk.Label(frame, text=label).grid(row=row_offset + index, column=0, sticky="w", pady=5, padx=(0, 12))
+            ttk.Label(frame, text=label).grid(
+                row=row_offset + index,
+                column=0,
+                sticky="w",
+                pady=5,
+                padx=(0, 12),
+            )
             ttk.Entry(frame, textvariable=self.variables[key], width=42).grid(
                 row=row_offset + index, column=1, sticky="ew", pady=5
             )
-        ttk.Label(frame, text="Beschreibung").grid(row=row_offset + 3, column=0, sticky="nw", pady=5, padx=(0, 12))
+        ttk.Label(frame, text="Beschreibung").grid(
+            row=row_offset + 3,
+            column=0,
+            sticky="nw",
+            pady=5,
+            padx=(0, 12),
+        )
         self.description_text = tk.Text(frame, width=42, height=5, wrap="word")
         self.description_text.grid(row=row_offset + 3, column=1, sticky="ew", pady=5)
         self.description_text.insert("1.0", self.preset_description)
@@ -488,7 +538,12 @@ class AssetClaimDialog(tk.Toplevel):
         buttons = ttk.Frame(frame)
         buttons.grid(row=row_offset + 5, column=0, columnspan=2, sticky="e", pady=(16, 0))
         ttk.Button(buttons, text="Abbrechen", command=self.destroy).pack(side="left", padx=(0, 8))
-        ttk.Button(buttons, text="Forderung anlegen", style="Accent.TButton", command=self._create).pack(side="left")
+        ttk.Button(
+            buttons,
+            text="Forderung anlegen",
+            style="Accent.TButton",
+            command=self._create,
+        ).pack(side="left")
         self.after_idle(lambda: frame.focus_set())
 
     def _activate_modal(self) -> None:
@@ -539,13 +594,23 @@ class IntegrityWarningDialog(tk.Toplevel):
             "Haben Sie alle Daten geprüft und soll der Hash jetzt aktualisiert werden?"
         )
         ttk.Label(frame, text=message, justify="left").grid(row=0, column=0, sticky="w")
-        ttk.Label(frame, text="\n".join(f"• {item}" for item in self.warnings), style="Warning.TLabel", justify="left").grid(
+        ttk.Label(
+            frame,
+            text="\n".join(f"• {item}" for item in self.warnings),
+            style="Warning.TLabel",
+            justify="left",
+        ).grid(
             row=1, column=0, sticky="w", pady=(12, 0)
         )
         buttons = ttk.Frame(frame)
         buttons.grid(row=2, column=0, sticky="e", pady=(18, 0))
         ttk.Button(buttons, text="Nein", command=self.destroy).pack(side="left", padx=(0, 8))
-        ttk.Button(buttons, text="Ja, bestätigen", style="Accent.TButton", command=self._confirm).pack(side="left")
+        ttk.Button(
+            buttons,
+            text="Ja, bestätigen",
+            style="Accent.TButton",
+            command=self._confirm,
+        ).pack(side="left")
 
     def _activate_modal(self) -> None:
         _activate_modal_window(self)
diff --git a/src/ccma/ui/main_window.py b/src/ccma/ui/main_window.py
index 9f827c3..51b2145 100644
--- a/src/ccma/ui/main_window.py
+++ b/src/ccma/ui/main_window.py
@@ -545,7 +545,9 @@ class MainWindow(ttk.Frame):
         self.tabs.refresh_icons(self.icons)
 
     def _show_validation_warning(self) -> None:
-        display_errors = [item for item in self.validation_errors if "Hash fehlt oder stimmt nicht" not in item]
+        display_errors = [
+            item for item in self.validation_errors if "Hash fehlt oder stimmt nicht" not in item
+        ]
         if not display_errors:
             return
         messagebox.showwarning(
diff --git a/src/ccma/ui/member_tab.py b/src/ccma/ui/member_tab.py
index 2b9d38a..e1ad3f5 100644
--- a/src/ccma/ui/member_tab.py
+++ b/src/ccma/ui/member_tab.py
@@ -8,17 +8,16 @@ from tkinter import messagebox, ttk
 
 from ccma.domain.contributions import CLAIM_STATUS_LABELS, claim_status, claim_total, money_text
 from ccma.domain.dates import age_label, date_input_hint, format_date_for_display
-from ccma.domain.models import ASSET_STATUS_LABELS, MEMBERSHIP_STATUS_LABELS as STATUS_LABELS
-from ccma.domain.models import Event
+from ccma.domain.models import ASSET_STATUS_LABELS, Event
+from ccma.domain.models import MEMBERSHIP_STATUS_LABELS as STATUS_LABELS
 from ccma.storage.repository import MemberRepository, RepositoryError
-from ccma.ui.document_dialog import DocumentTemplateDialog
 from ccma.ui.dialogs import IntegrityWarningDialog
+from ccma.ui.document_dialog import DocumentTemplateDialog
 from ccma.ui.file_open import open_path
 from ccma.ui.labels import display_label, storage_key
 from ccma.ui.messages import MessageAction, MessageBannerList, TabMessage
 from ccma.ui.scrolling import ScrollableFrame
 
-
 CLAIM_TABLE_COLUMNS = (
     ("title", "Forderung", 220),
     ("due", "Fällig", 100),
@@ -287,8 +286,12 @@ class MemberTab(ttk.Frame):
         ttk.Button(asset_actions, text="Asset öffnen", command=self._open_selected_asset).pack(
             side="left", padx=(0, 8)
         )
-        ttk.Button(asset_actions, text="Ausgewähltes Asset zurücknehmen", command=self._return_selected_asset).pack(
-            side="left"
+        ttk.Button(
+            asset_actions,
+            text="Ausgewähltes Asset zurücknehmen",
+            command=self._return_selected_asset,
+        ).pack(
+            side="left",
         )
 
         documents_tab.columnconfigure(0, weight=1)
@@ -493,7 +496,11 @@ class MemberTab(ttk.Frame):
             suffix = ""
             if key == self.claim_sort_column:
                 suffix = " v" if self.claim_sort_descending else " ^"
-            self.claims.heading(key, text=f"{title}{suffix}", command=lambda column=key: self._toggle_claim_sort(column))
+            self.claims.heading(
+                key,
+                text=f"{title}{suffix}",
+                command=lambda column=key: self._toggle_claim_sort(column),
+            )
 
     def _open_selected_claim(self) -> None:
         selected = self.claims.selection()
diff --git a/src/ccma/ui/messages.py b/src/ccma/ui/messages.py
index ee79dd1..15fc270 100644
--- a/src/ccma/ui/messages.py
+++ b/src/ccma/ui/messages.py
@@ -5,7 +5,6 @@ from collections.abc import Callable, Iterable
 from dataclasses import dataclass
 from tkinter import ttk
 
-
 MessageType = str
 
 
diff --git a/src/ccma/ui/work_tabs.py b/src/ccma/ui/work_tabs.py
index d61eb40..26b2c1c 100644
--- a/src/ccma/ui/work_tabs.py
+++ b/src/ccma/ui/work_tabs.py
@@ -4,11 +4,16 @@ from collections.abc import Callable
 from tkinter import messagebox, ttk
 
 from ccma.domain.dates import format_date_for_display
-from ccma.domain.models import ASSET_STATUS_LABELS, MEMBERSHIP_STATUS_LABELS, Asset, HousekeeperFinding, Member
+from ccma.domain.models import (
+    ASSET_STATUS_LABELS,
+    MEMBERSHIP_STATUS_LABELS,
+    Asset,
+    HousekeeperFinding,
+    Member,
+)
 from ccma.ui.labels import storage_key
 from ccma.ui.sections import titled_frame
 
-
 MEMBER_TABLE_COLUMNS = (
     ("number", "Nummer", 110),
     ("first_name", "Vorname", 160),
@@ -306,7 +311,11 @@ class MembersTab(ttk.Frame):
             suffix = ""
             if key == self.sort_column:
                 suffix = " v" if self.sort_descending else " ^"
-            self.tree.heading(key, text=f"{title}{suffix}", command=lambda column=key: self._toggle_sort(column))
+            self.tree.heading(
+                key,
+                text=f"{title}{suffix}",
+                command=lambda column=key: self._toggle_sort(column),
+            )
 
     def _open_selected(self) -> None:
         selected = self.tree.selection()
@@ -368,7 +377,11 @@ class AssetsTab(ttk.Frame):
         )
         self.status_filter.grid(row=0, column=1, sticky="w")
         self.status_filter.bind("<<ComboboxSelected>>", lambda _event: self._render_assets())
-        self.tree = ttk.Treeview(self, columns=tuple(key for key, _title, _width in ASSET_TABLE_COLUMNS), show="headings")
+        self.tree = ttk.Treeview(
+            self,
+            columns=tuple(key for key, _title, _width in ASSET_TABLE_COLUMNS),
+            show="headings",
+        )
         for key, title, width in ASSET_TABLE_COLUMNS:
             self.tree.heading(key, text=title, command=lambda column=key: self._toggle_sort(column))
             self.tree.column(key, width=width, anchor="w")
@@ -377,13 +390,28 @@ class AssetsTab(ttk.Frame):
         self.tree.bind("<<TreeviewSelect>>", lambda _event: self._update_actions())
         actions = ttk.Frame(self)
         actions.grid(row=3, column=0, sticky="e", pady=(10, 0))
-        self.edit_button = ttk.Button(actions, text="Bearbeiten", command=self._edit_selected, state="disabled")
+        self.edit_button = ttk.Button(
+            actions,
+            text="Bearbeiten",
+            command=self._edit_selected,
+            state="disabled",
+        )
         self.edit_button.pack(side="left", padx=(0, 8))
         self.open_button = ttk.Button(actions, text="Öffnen", command=self._open_selected, state="disabled")
         self.open_button.pack(side="left", padx=(0, 8))
-        self.issue_button = ttk.Button(actions, text="Ausgeben", command=self._issue_selected, state="disabled")
+        self.issue_button = ttk.Button(
+            actions,
+            text="Ausgeben",
+            command=self._issue_selected,
+            state="disabled",
+        )
         self.issue_button.pack(side="left", padx=(0, 8))
-        self.return_button = ttk.Button(actions, text="Zurücknehmen", command=self._return_selected, state="disabled")
+        self.return_button = ttk.Button(
+            actions,
+            text="Zurücknehmen",
+            command=self._return_selected,
+            state="disabled",
+        )
         self.return_button.pack(side="left")
         self.refresh(self.assets)
 
@@ -437,7 +465,11 @@ class AssetsTab(ttk.Frame):
             suffix = ""
             if key == self.sort_column:
                 suffix = " v" if self.sort_descending else " ^"
-            self.tree.heading(key, text=f"{title}{suffix}", command=lambda column=key: self._toggle_sort(column))
+            self.tree.heading(
+                key,
+                text=f"{title}{suffix}",
+                command=lambda column=key: self._toggle_sort(column),
+            )
 
     def _selected_asset_id(self) -> str:
         selected = self.tree.selection()
diff --git a/tests/test_repository.py b/tests/test_repository.py
index 7fa593e..0aa46ed 100644
--- a/tests/test_repository.py
+++ b/tests/test_repository.py
@@ -422,4 +422,7 @@ def test_housekeeper_reports_json_hash_mismatch(tmp_path) -> None:
 
     findings = Housekeeper(repository).run()
 
-    assert any(finding.code == "json_hash_mismatch" and finding.member_id == member.member_id for finding in findings)
+    assert any(
+        finding.code == "json_hash_mismatch" and finding.member_id == member.member_id
+        for finding in findings
+    )