Let editors define FAQ topics freely instead of a hard-coded map

.editorconfig

@@ -54,3 +54,9 @@ dotnet_diagnostic.CA1812.severity = none
 # layout and is harmless (Blazor routing is not namespace-based). Renaming would
 # break the folder convention for no benefit.
 dotnet_diagnostic.CA1724.severity = none
+
+# CA1308 wants ToUpperInvariant over ToLowerInvariant. That advice is for
+# normalizing before a comparison, where a few characters do not round-trip. Here
+# lowercasing is the goal itself (URL slugs, which must be lowercase), not a step
+# before a comparison -- comparisons use StringComparison.OrdinalIgnoreCase instead.
+dotnet_diagnostic.CA1308.severity = none

CLAUDE.md

@@ -83,11 +83,47 @@ Inhalt liegt in PocketBase (`pb_data`), das separat gesichert wird (siehe
 - Datenzugriff über den typisierten `PocketBaseClient` (registriert via
   `AddHttpClient`), der pro Request liest — kein Start-Cache, kein Singleton mit
   Inhalten. Komponenten liegen feature-basiert unter `Features/<Bereich>/`.
-- Öffentliche Typen und Methoden im `PocketBaseClient` und in `Contracts`
-  bekommen XML-Doc (auf Englisch, leicht verständlich), Razor-Markup nicht.
+- JSON-Konverter liegen in `Contracts` und werden per `[JsonConverter]` **am Feld**
+  zugeordnet, nicht global auf den `JsonSerializerOptions` im Client registriert. So
+  ist am Contract sichtbar, wie ein Feld behandelt wird (z. B. `Event.Start` als
+  Zeitpunkt, `Post.Date` als Kalendertag), und `Contracts` bekommt keine Referenz
+  auf `PocketBase` (Zirkel). Datumsfelder: `DateTime`/`DateTime?` = Zeitpunkt
+  (Europe/Berlin), `DateOnly` = Kalendertag.
 - **Code durchgängig auf Englisch** — Typen, Member, Variablen, Kommentare,
   Skripte und Doku. Das gilt **auch für Domänenbegriffe**: im Code `Event`, nicht
   `Termin`; `Post`, nicht `Beitrag`. Deutsch bleibt ausschließlich, was ein
   Besucher liest oder ein Redakteur pflegt: UI-Texte sowie die **Werte** der
   PocketBase-Records (z. B. `title: Vorstandsteam`, der Markdown-`body`). Die
   Feldnamen und Slugs bleiben dagegen englisch (`title`, `slug`, `/board`).
+
+## Coding Convention
+
+- **Ausdruckskörper (`=>`) sind Pflicht, wo syntaktisch möglich** — Methoden,
+  Properties, Konstruktoren, Operatoren, lokale Funktionen. Ein `if/else`, das
+  einen Wert liefert, wird zum ternären Ausdruck oder zur `switch`-Expression, kein
+  Block-Körper mit `return`. Ein Block-Körper nur, wo ein Ausdruck sprachlich nicht
+  geht (mehrere Anweisungen ohne Rückgabe, `ref`/`out`, `yield`).
+- Ternäre und `switch`-Expressions dürfen dafür mehrzeilig umgebrochen werden;
+  Lesbarkeit entsteht durch Einrückung, nicht durch einen Block.
+- Nullable aktiv nutzen: `?`, `??`, `??=` statt Nullprüfungen im Block. Ein
+  ungültiger `null`-Fall wird als Ausdruck geworfen (`?? throw new …`).
+- Argumente/Rückgaben früh und knapp validieren, bevorzugt als Ausdruck.
+
+## Documentation Convention
+
+Vorbild ist `Elternbeirat.PocketBase/LocalDateTimeConverter.cs` — daran
+ausrichten.
+
+- **Jeder öffentliche (`public`/`protected`) Typ und Member bekommt XML-Doc** —
+  nicht nur `PocketBaseClient` und `Contracts`. Interne Helfer, die Teil der
+  fachlichen Erklärung sind (wie `WallClock`), ebenfalls. Razor-Markup nicht.
+- Voller Umfang, wo zutreffend: `<summary>`, dazu `<param>`, `<returns>`,
+  `<exception>` (jede geworfene Bedingung), `<remarks>` für Kontext/Fallstricke,
+  `<example>` mit `<code>` für nicht offensichtliche Nutzung, `<seealso>` auf
+  verwandte Typen. `<inheritdoc/>` bei Interface-/Basis-Implementierungen.
+- Code im Text als Markup referenzieren, nicht als Prosa: `<see cref="…"/>`,
+  `<see langword="null"/>`/`<see langword="false"/>`, `<c>…</c>` für Literale.
+- Einrückung: der Textinhalt steht mit vier Leerzeichen unter dem `///`-Tag
+  (`///     Text`), Tags sauber verschachtelt.
+- Englisch, leicht verständlich, erklärt **warum**, nicht was der Code ohnehin
+  zeigt.

Elternbeirat.Contracts/DateOnlyConverter.cs

@@ -0,0 +1,47 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Elternbeirat.Contracts;
+
+/// <summary>
+///     JSON converter that reads and writes a PocketBase date as a calendar date
+///     (<see cref="DateOnly"/>), keeping the day and dropping the time-of-day.
+/// </summary>
+/// <remarks>
+///     PocketBase has no date-only field type: it stores every date as a UTC
+///     instant with a time-of-day (e.g. an editor's <c>2 Jan 00:00</c> Berlin is
+///     stored as <c>"2026-01-01 22:00:00.000Z"</c>). The day the editor meant is
+///     therefore the day <em>in Berlin</em>, not the day of the raw UTC string. This
+///     converter reuses the same UTC-&gt;Berlin conversion as
+///     <see cref="LocalDateTimeConverter"/> and then keeps only the date, so the day
+///     shown is the day that was entered -- with no time-of-day and no off-by-one.
+/// </remarks>
+/// <example>
+///     Apply it to a calendar-day field of a contract:
+/// <code>
+///     [JsonConverter(typeof(DateOnlyConverter))]
+///     public DateOnly Date { get; init; }
+/// </code>
+/// </example>
+/// <seealso cref="WallClock"/>
+public sealed class DateOnlyConverter : JsonConverter<DateOnly>
+{
+    /// <inheritdoc/>
+    /// <exception cref="FormatException">
+    ///     The stored value is not a valid date string.
+    /// </exception>
+    public override DateOnly Read(
+        ref Utf8JsonReader reader,
+        Type typeToConvert,
+        JsonSerializerOptions options)
+        => WallClock.Parse(reader.GetString()) is { } berlin
+            ? DateOnly.FromDateTime(berlin)
+            : default;
+
+    /// <inheritdoc/>
+    public override void Write(
+        Utf8JsonWriter writer,
+        DateOnly value,
+        JsonSerializerOptions options)
+        => writer.WriteStringValue(WallClock.Format(value.ToDateTime(TimeOnly.MinValue)));
+}

Elternbeirat.Contracts/Event.cs

@@ -2,38 +2,87 @@ using System.Text.Json.Serialization;
 
 namespace Elternbeirat.Contracts;
 
-/// <summary>A calendar entry. Sorted by <see cref="Start"/>.</summary>
+/// <summary>
+///     A calendar entry of the Elternbeirat, as stored in PocketBase.
+/// </summary>
+/// <remarks>
+///     Event lists are ordered by <see cref="Start"/>. Unset optional text fields are
+///     <see cref="string.Empty"/>, never <see langword="null"/>.
+/// </remarks>
 public record Event
 {
-    /// <summary>PocketBase record id.</summary>
+    /// <summary>
+    ///     Gets the PocketBase record id.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: every stored record has an id. Modeling it as
+    ///     required states which fields a record must carry, independent of the store,
+    ///     so a future data source has to supply them too.
+    /// </remarks>
     [JsonPropertyName("id")]
-    public string Id { get; init; } = "";
+    public required string Id { get; init; }
 
     /// <summary>
-    /// Start of the event with date and time. Stored as UTC by PocketBase but
-    /// read as local time (Europe/Berlin) by convention. An all-day event uses
-    /// 00:00 as the time.
+    ///     Gets the start of the event as Europe/Berlin wall-clock time.
     /// </summary>
+    /// <remarks>
+    ///     PocketBase stores the value in UTC; it is converted to Berlin local time on
+    ///     deserialization, with daylight saving applied. An all-day event uses 00:00
+    ///     as the time.
+    ///     <see langword="required"/>: an event without a start has no place on the
+    ///     calendar, and the field is required in PocketBase.
+    /// </remarks>
     [JsonPropertyName("start")]
-    public DateTime Start { get; init; }
+    [JsonConverter(typeof(LocalDateTimeConverter))]
+    public required DateTime Start { get; init; }
 
-    /// <summary>Optional end of the event; null when unset.</summary>
+    /// <summary>
+    ///     Gets the optional end of the event as Europe/Berlin wall-clock time.
+    /// </summary>
+    /// <value>
+    ///     The end time, or <see langword="null"/> if the event has no end.
+    /// </value>
     [JsonPropertyName("end")]
+    [JsonConverter(typeof(NullableLocalDateTimeConverter))]
     public DateTime? End { get; init; }
 
-    /// <summary>Event name, e.g. "Elternbeiratssitzung".</summary>
+    /// <summary>
+    ///     Gets the event name, e.g. <c>"Elternbeiratssitzung"</c>.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: an event without a name is incomplete, and the
+    ///     field is required in PocketBase.
+    /// </remarks>
     [JsonPropertyName("title")]
-    public string Title { get; init; } = "";
+    public required string Title { get; init; }
 
-    /// <summary>Optional location, e.g. "Aula".</summary>
+    /// <summary>
+    ///     Gets the optional location, e.g. <c>"Aula"</c>.
+    /// </summary>
+    /// <value>
+    ///     The location, or <see cref="string.Empty"/> if none is set.
+    /// </value>
     [JsonPropertyName("location")]
-    public string Location { get; init; } = "";
+    public string Location { get; init; } = string.Empty;
 
-    /// <summary>Optional note, e.g. "Anmeldung erforderlich".</summary>
+    /// <summary>
+    ///     Gets the optional note, e.g. <c>"Anmeldung erforderlich"</c>.
+    /// </summary>
+    /// <value>
+    ///     The note, or <see cref="string.Empty"/> if none is set.
+    /// </value>
     [JsonPropertyName("note")]
-    public string Note { get; init; } = "";
+    public string Note { get; init; } = string.Empty;
 
-    /// <summary>Whether the event is visible to visitors.</summary>
-    [JsonPropertyName("public")]
-    public bool Public { get; init; }
+    /// <summary>
+    ///     Gets a value indicating whether the event has a wall-clock time, as opposed
+    ///     to being an all-day event.
+    /// </summary>
+    /// <remarks>
+    ///     PocketBase has no all-day flag; the convention is that a start of 00:00
+    ///     means all-day. This is the single definition of that rule -- formatting and
+    ///     the calendar feed both read it here instead of re-deriving it.
+    /// </remarks>
+    [JsonIgnore]
+    public bool HasTime => Start.TimeOfDay != TimeSpan.Zero;
 }

Elternbeirat.Contracts/Faq.cs

@@ -3,27 +3,56 @@ using System.Text.Json.Serialization;
 namespace Elternbeirat.Contracts;
 
 /// <summary>
-/// A single question and answer, grouped on the FAQ page by <see cref="Topic"/>.
+///     A single question and answer of the FAQ, as stored in PocketBase.
 /// </summary>
+/// <remarks>
+///     On the FAQ page, entries are grouped by <see cref="Topic"/>.
+/// </remarks>
 public record Faq
 {
-    /// <summary>PocketBase record id.</summary>
+    /// <summary>
+    ///     Gets the PocketBase record id.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: every stored record has an id. Modeling it as
+    ///     required states which fields a record must carry, independent of the store,
+    ///     so a future data source has to supply them too.
+    /// </remarks>
     [JsonPropertyName("id")]
-    public string Id { get; init; } = "";
+    public required string Id { get; init; }
 
-    /// <summary>The question as a parent would phrase it.</summary>
+    /// <summary>
+    ///     Gets the question as a parent would phrase it.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: a FAQ entry without a question is incomplete, and
+    ///     the field is required in PocketBase.
+    /// </remarks>
     [JsonPropertyName("question")]
-    public string Question { get; init; } = "";
+    public required string Question { get; init; }
 
-    /// <summary>The answer in Markdown.</summary>
+    /// <summary>
+    ///     Gets the answer as Markdown.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: a FAQ entry exists to answer its question, so an
+    ///     entry without an answer is incomplete. The field is required in PocketBase.
+    /// </remarks>
     [JsonPropertyName("answer")]
-    public string Answer { get; init; } = "";
+    public required string Answer { get; init; }
 
-    /// <summary>Topic the question is grouped under, e.g. "mensa".</summary>
+    /// <summary>
+    ///     Gets the topic the question is grouped under, e.g.
+    ///     <c>"Mensa und Mittagessen"</c>.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: the FAQ page groups entries by topic, so an entry
+    ///     without one has no place. The field is required in PocketBase.
+    ///
+    ///     This is the heading shown on the page verbatim, not a slug: editors add a
+    ///     new group by typing its heading here, no code change. Entries with the same
+    ///     topic text land in one group.
+    /// </remarks>
     [JsonPropertyName("topic")]
-    public string Topic { get; init; } = "";
-
-    /// <summary>Whether the question is visible to visitors.</summary>
-    [JsonPropertyName("public")]
-    public bool Public { get; init; }
+    public required string Topic { get; init; }
 }

Elternbeirat.Contracts/LocalDateTimeConverter.cs

@@ -0,0 +1,133 @@
+using System.Globalization;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Elternbeirat.Contracts;
+
+/// <summary>
+///     Converts between PocketBase date strings and Europe/Berlin wall-clock time.
+/// </summary>
+/// <remarks>
+///     PocketBase stores every date in UTC and serializes it with a trailing <c>Z</c>
+///     (e.g. <c>"2026-10-08 17:30:00.000Z"</c>). The values produced here are local
+///     wall-clock numbers: an editor who typed 19:30 in the admin form gets 19:30 back,
+///     with daylight saving applied by the time zone. They carry
+///     <see cref="DateTimeKind.Unspecified"/> so that no later formatting shifts them again.
+/// </remarks>
+internal static class WallClock
+{
+    /// <summary>
+    ///     IANA id; resolves on every platform .NET supports, Windows included.
+    /// </summary>
+    private static readonly TimeZoneInfo Berlin =
+        TimeZoneInfo.FindSystemTimeZoneById("Europe/Berlin");
+
+    /// <summary>
+    ///     Parses a PocketBase UTC date string into Berlin wall-clock time.
+    /// </summary>
+    /// <param name="raw">
+    ///     The raw PocketBase value; may be <see langword="null"/> or empty.
+    /// </param>
+    /// <returns>
+    ///     The Berlin wall-clock time with <see cref="DateTimeKind.Unspecified"/>, or
+    ///     <see langword="null"/> if <paramref name="raw"/> is <see langword="null"/> or empty
+    ///     (PocketBase's representation of an unset date).
+    /// </returns>
+    /// <exception cref="FormatException">
+    ///     <paramref name="raw"/> is not a valid date string.
+    /// </exception>
+    public static DateTime? Parse(string? raw) =>
+        string.IsNullOrEmpty(raw)
+            ? null
+            : TimeZoneInfo.ConvertTime(
+                DateTimeOffset.Parse(raw, CultureInfo.InvariantCulture), Berlin).DateTime;
+
+    /// <summary>
+    ///     Formats a Berlin wall-clock time as the UTC string PocketBase stores.
+    ///     Inverse of <see cref="Parse"/>.
+    /// </summary>
+    /// <param name="berlin">
+    ///     A Berlin wall-clock time. Its <see cref="DateTime.Kind"/> is ignored, and the
+    ///     value is always interpreted as Berlin local time.
+    /// </param>
+    /// <returns>
+    ///     The UTC value in PocketBase format, e.g. <c>"2026-10-08 17:30:00.000Z"</c>.
+    /// </returns>
+    /// <exception cref="ArgumentException">
+    ///     <paramref name="berlin"/> does not exist in Berlin, because it falls in the
+    ///     daylight-saving gap in spring.
+    /// </exception>
+    public static string Format(DateTime berlin) =>
+        TimeZoneInfo.ConvertTimeToUtc(DateTime.SpecifyKind(berlin, DateTimeKind.Unspecified), Berlin)
+            .ToString("yyyy-MM-dd HH:mm:ss.fff'Z'", CultureInfo.InvariantCulture);
+}
+
+/// <summary>
+///     JSON converter that reads and writes PocketBase dates as Europe/Berlin
+///     wall-clock <see cref="DateTime"/> values.
+/// </summary>
+/// <remarks>
+///     An empty string (unset date) is read as <see langword="default"/>(<see cref="DateTime"/>).
+///     For optional dates, use <see cref="NullableLocalDateTimeConverter"/> instead.
+/// </remarks>
+/// <example>
+///     Apply it to a required date field of a contract:
+/// <code>
+///     [JsonConverter(typeof(LocalDateTimeConverter))]
+///     public DateTime Start { get; init; }
+/// </code>
+/// </example>
+/// <seealso cref="WallClock"/>
+public sealed class LocalDateTimeConverter : JsonConverter<DateTime>
+{
+    /// <inheritdoc/>
+    public override DateTime Read(
+        ref Utf8JsonReader reader,
+        Type typeToConvert,
+        JsonSerializerOptions options)
+        => WallClock.Parse(reader.GetString()) ?? default;
+
+    /// <inheritdoc/>
+    public override void Write(
+        Utf8JsonWriter writer,
+        DateTime value,
+        JsonSerializerOptions options)
+        => writer.WriteStringValue(WallClock.Format(value));
+}
+
+/// <summary>
+///     JSON converter that reads and writes optional PocketBase dates as Europe/Berlin
+///     wall-clock <see cref="DateTime"/> values.
+/// </summary>
+/// <remarks>
+///     PocketBase sends an empty string for an unset optional date (e.g. an event
+///     without an end). This value, like JSON <c>null</c>, is read as <see langword="null"/>.
+/// </remarks>
+/// <example>
+///     Apply it to an optional date field of a contract:
+/// <code>
+///     [JsonConverter(typeof(NullableLocalDateTimeConverter))]
+///     public DateTime? End { get; init; }
+/// </code>
+/// </example>
+/// <seealso cref="WallClock"/>
+public sealed class NullableLocalDateTimeConverter : JsonConverter<DateTime?>
+{
+    /// <inheritdoc/>
+    public override DateTime? Read(
+        ref Utf8JsonReader reader,
+        Type typeToConvert,
+        JsonSerializerOptions options)
+        => WallClock.Parse(reader.GetString());
+
+    /// <inheritdoc/>
+    /// <remarks>
+    ///     Only called for non-null values: <see cref="JsonConverter{T}.HandleNull"/> is
+    ///     <see langword="false"/>, so the serializer writes <see langword="null"/> itself.
+    /// </remarks>
+    public override void Write(
+        Utf8JsonWriter writer,
+        DateTime? value,
+        JsonSerializerOptions options)
+        => writer.WriteStringValue(WallClock.Format(value ?? throw new ArgumentNullException(nameof(value))));
+}

Elternbeirat.Contracts/Page.cs

@@ -3,45 +3,114 @@ using System.Text.Json.Serialization;
 namespace Elternbeirat.Contracts;
 
 /// <summary>
-/// A content page. Pages also drive the site navigation: <see cref="Location"/>
-/// and <see cref="Order"/> decide where and in which order a page appears in the
-/// header or footer menu, and <see cref="Embed"/> lists dynamic blocks (posts,
-/// events, faqs) rendered below the page body.
+///     A content page of the site, as stored in PocketBase.
 /// </summary>
+/// <remarks>
+///     Pages also drive the site navigation: <see cref="Location"/> and
+///     <see cref="Order"/> decide where and in which order a page appears in the
+///     header or footer menu. <see cref="Embed"/> lists dynamic blocks rendered
+///     below the page body.
+/// </remarks>
 public record Page
 {
-    /// <summary>PocketBase record id.</summary>
+    /// <summary>
+    ///     The slug of the home page, which is served at the site root <c>/</c> rather
+    ///     than at <c>/home</c>. Reserved: no other page may use it.
+    /// </summary>
+    private const string HomeSlug = "home";
+
+    /// <summary>
+    ///     Gets the PocketBase record id.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: every stored record has an id. Modeling it as
+    ///     required states which fields a record must carry, independent of the store,
+    ///     so a future data source has to supply them too.
+    /// </remarks>
     [JsonPropertyName("id")]
-    public string Id { get; init; } = "";
+    public required string Id { get; init; }
 
-    /// <summary>Heading shown to visitors; may contain umlauts and spaces.</summary>
+    /// <summary>
+    ///     Gets the heading shown to visitors.
+    /// </summary>
+    /// <remarks>
+    ///     Free text; may contain umlauts and spaces. For the URL, see <see cref="Slug"/>.
+    ///     <see langword="required"/>: a page without a heading is incomplete, and the
+    ///     field is required in PocketBase.
+    /// </remarks>
     [JsonPropertyName("title")]
-    public string Title { get; init; } = "";
+    public required string Title { get; init; }
 
-    /// <summary>Page body in Markdown.</summary>
+    /// <summary>
+    ///     Gets the page body as Markdown.
+    /// </summary>
     [JsonPropertyName("body")]
-    public string Body { get; init; } = "";
+    public string Body { get; init; } = string.Empty;
 
-    /// <summary>Where the page appears in the navigation: "header" or "footer".</summary>
+    /// <summary>
+    ///     Gets the navigation menu the page appears in.
+    /// </summary>
+    /// <value>
+    ///     Either <c>"header"</c> or <c>"footer"</c>.
+    /// </value>
+    /// <remarks>
+    ///     <see langword="required"/>: the navigation is built from this, and the field
+    ///     is required in PocketBase, so every page belongs to one of the two menus.
+    /// </remarks>
     [JsonPropertyName("location")]
-    public string Location { get; init; } = "";
+    public required string Location { get; init; }
 
-    /// <summary>Sort order within its navigation location; smaller is earlier.</summary>
+    /// <summary>
+    ///     Gets the sort order within the navigation menu given by <see cref="Location"/>.
+    /// </summary>
+    /// <value>
+    ///     The sort key; pages with smaller values appear first.
+    /// </value>
     [JsonPropertyName("order")]
     public double Order { get; init; }
 
-    /// <summary>URL slug (lowercase, no umlauts), e.g. "board" -> /board.</summary>
+    /// <summary>
+    ///     Gets the URL slug of the page, e.g. <c>"board"</c> for <c>/board</c>.
+    /// </summary>
+    /// <value>
+    ///     A URL path segment: lowercase letters, digits and single hyphens as
+    ///     separators, no umlauts. PocketBase enforces this on save via a field
+    ///     pattern (<c>^[a-z0-9]+(-[a-z0-9]+)*$</c>), so every stored slug is already
+    ///     canonical and the app can use it verbatim in comparisons and generated URLs.
+    /// </value>
+    /// <remarks>
+    ///     <see langword="required"/>: the slug is how a page is addressed, so a record
+    ///     without one is broken. It is a required field in PocketBase, so deserializing
+    ///     one that lacks it should fail loudly rather than yield a page with no URL.
+    /// </remarks>
     [JsonPropertyName("slug")]
-    public string Slug { get; init; } = "";
+    public required string Slug { get; init; }
 
     /// <summary>
-    /// Dynamic blocks to render below the body: any of "posts", "events", "faqs".
-    /// Empty for a plain text page.
+    ///     Gets the dynamic blocks rendered below the <see cref="Body"/>.
     /// </summary>
+    /// <value>
+    ///     Any of <c>"posts"</c>, <c>"events"</c> and <c>"faqs"</c>, or an empty list
+    ///     for a plain text page.
+    /// </value>
     [JsonPropertyName("embed")]
     public IReadOnlyList<string> Embed { get; init; } = [];
 
-    /// <summary>Whether the page is visible to visitors.</summary>
-    [JsonPropertyName("public")]
-    public bool Public { get; init; }
+    /// <summary>
+    ///     Tests whether a slug is the home page's. This is the single definition of
+    ///     that comparison, so every caller identifies the home page the same way.
+    /// </summary>
+    /// <remarks>
+    ///     An ordinal (case-sensitive) comparison is enough because slugs are always
+    ///     lowercase: PocketBase enforces that with a field pattern (see
+    ///     <see cref="Slug"/>), and this is only ever called with a stored slug.
+    /// </remarks>
+    /// <param name="slug">
+    ///     The slug to test, e.g. from <see cref="Slug"/>.
+    /// </param>
+    /// <returns>
+    ///     <see langword="true"/> if <paramref name="slug"/> is the home page's slug.
+    /// </returns>
+    public static bool IsHomeSlug(string slug) =>
+        string.Equals(slug, HomeSlug, StringComparison.Ordinal);
 }

Elternbeirat.Contracts/Post.cs

@@ -2,33 +2,69 @@ using System.Text.Json.Serialization;
 
 namespace Elternbeirat.Contracts;
 
-/// <summary>A news post. Sorted by <see cref="Date"/>, newest first.</summary>
+/// <summary>
+///     A news post of the site, as stored in PocketBase.
+/// </summary>
+/// <remarks>
+///     Post lists are ordered by <see cref="Date"/>, newest first.
+/// </remarks>
 public record Post
 {
-    /// <summary>PocketBase record id.</summary>
+    /// <summary>
+    ///     Gets the PocketBase record id.
+    /// </summary>
+    /// <remarks>
+    ///     <see langword="required"/>: every stored record has an id. Modeling it as
+    ///     required states which fields a record must carry, independent of the store,
+    ///     so a future data source has to supply them too.
+    /// </remarks>
     [JsonPropertyName("id")]
-    public string Id { get; init; } = "";
+    public required string Id { get; init; }
 
     /// <summary>
-    /// Publication date. Stored as UTC by PocketBase but read as local time
-    /// (Europe/Berlin) by convention; only the date part is shown.
+    ///     Gets the publication date as a calendar day.
     /// </summary>
+    /// <remarks>
+    ///     A post's date is a plain day, not a point in time. It is read as the
+    ///     Berlin calendar day: the UTC value is converted to Europe/Berlin and only
+    ///     the day is kept, so the day an editor picked is the day shown -- no
+    ///     time-of-day, no off-by-one at midnight. See <see cref="DateOnlyConverter"/>.
+    /// </remarks>
     [JsonPropertyName("date")]
-    public DateTime Date { get; init; }
+    [JsonConverter(typeof(DateOnlyConverter))]
+    public DateOnly Date { get; init; }
 
-    /// <summary>Post heading shown to visitors; may contain umlauts and spaces.</summary>
+    /// <summary>
+    ///     Gets the heading shown to visitors.
+    /// </summary>
+    /// <remarks>
+    ///     Free text; may contain umlauts and spaces. For the URL, see <see cref="Slug"/>.
+    ///     <see langword="required"/>: a post without a heading is incomplete, and the
+    ///     field is required in PocketBase.
+    /// </remarks>
     [JsonPropertyName("title")]
-    public string Title { get; init; } = "";
+    public required string Title { get; init; }
 
-    /// <summary>Post body in Markdown.</summary>
+    /// <summary>
+    ///     Gets the post body as Markdown.
+    /// </summary>
     [JsonPropertyName("body")]
-    public string Body { get; init; } = "";
+    public string Body { get; init; } = string.Empty;
 
-    /// <summary>URL slug (lowercase, no umlauts), e.g. "herbstbasar" -> /posts/herbstbasar.</summary>
+    /// <summary>
+    ///     Gets the URL slug of the post, e.g. <c>"herbstbasar"</c> for <c>/posts/herbstbasar</c>.
+    /// </summary>
+    /// <value>
+    ///     A URL path segment: lowercase letters, digits and single hyphens as
+    ///     separators, no umlauts. PocketBase enforces this on save via a field
+    ///     pattern (<c>^[a-z0-9]+(-[a-z0-9]+)*$</c>), so every stored slug is already
+    ///     canonical and the app can use it verbatim in comparisons and generated URLs.
+    /// </value>
+    /// <remarks>
+    ///     <see langword="required"/>: the slug is how a post is addressed, so a record
+    ///     without one is broken. It is a required field in PocketBase, so deserializing
+    ///     one that lacks it should fail loudly rather than yield a post with no URL.
+    /// </remarks>
     [JsonPropertyName("slug")]
-    public string Slug { get; init; } = "";
-
-    /// <summary>Whether the post is visible to visitors.</summary>
-    [JsonPropertyName("public")]
-    public bool Public { get; init; }
+    public required string Slug { get; init; }
 }

Elternbeirat.PocketBase/LocalDateTimeConverter.cs

@@ -1,75 +0,0 @@
-using System.Globalization;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace Elternbeirat.PocketBase;
-
-/// <summary>
-/// Shared parsing of a PocketBase date string as wall-clock time. The trailing
-/// "Z" is stripped rather than honoured, so the number is taken at face value and
-/// the result carries <see cref="DateTimeKind.Unspecified"/> -- no timezone shift.
-/// </summary>
-internal static class WallClock
-{
-    public static DateTime Parse(string raw)
-    {
-        // Drop a trailing "Z" so DateTime.Parse does not treat the value as UTC
-        // and convert it to local time (which would shift 19:30 to 20:30/21:30).
-        var value = raw.EndsWith('Z') ? raw[..^1] : raw;
-        var parsed = DateTime.Parse(value, CultureInfo.InvariantCulture,
-            DateTimeStyles.None);
-        return DateTime.SpecifyKind(parsed, DateTimeKind.Unspecified);
-    }
-}
-
-/// <summary>
-/// Reads PocketBase date values as local wall-clock time.
-/// <para>
-/// PocketBase stores every date in UTC and serializes it with a trailing "Z"
-/// (e.g. "2026-10-08 19:30:00.000Z"). By project convention the stored number
-/// IS the local time (Europe/Berlin) and the "Z" is ignored -- see the timezone
-/// decision in the data model. This converter therefore parses the value and
-/// returns it as an <see cref="DateTimeKind.Unspecified"/> instant, so no
-/// timezone shift is ever applied when the value is later formatted.
-/// </para>
-/// </summary>
-public sealed class LocalDateTimeConverter : JsonConverter<DateTime>
-{
-    public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-    {
-        var raw = reader.GetString();
-        return string.IsNullOrEmpty(raw) 
-            ? default 
-            : WallClock.Parse(raw);
-    }
-
-    public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
-        => writer.WriteStringValue(value.ToString("yyyy-MM-dd HH:mm:ss.fff'Z'",
-            CultureInfo.InvariantCulture));
-}
-
-/// <summary>
-/// Nullable counterpart of <see cref="LocalDateTimeConverter"/>. PocketBase sends
-/// an empty string for an unset optional date (e.g. an event without an end);
-/// that maps to null.
-/// </summary>
-public sealed class NullableLocalDateTimeConverter : JsonConverter<DateTime?>
-{
-    public override DateTime? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-    {
-        var raw = reader.GetString();
-        if (string.IsNullOrEmpty(raw))
-            return null;
-
-        return WallClock.Parse(raw);
-    }
-
-    public override void Write(Utf8JsonWriter writer, DateTime? value, JsonSerializerOptions options)
-    {
-        if (value is null)
-            writer.WriteStringValue("");
-        else
-            writer.WriteStringValue(value.Value.ToString("yyyy-MM-dd HH:mm:ss.fff'Z'",
-                CultureInfo.InvariantCulture));
-    }
-}

Elternbeirat.PocketBase/PocketBaseClient.cs

@@ -6,46 +6,115 @@ namespace Elternbeirat.PocketBase;
 
 /// <summary>
 ///     Reads published content from a PocketBase instance over its REST API.
-/// <para>
-/// One method per collection (pages, posts, events, faqs). Each returns only
-/// records with <c>public = true</c> and lets PocketBase do the filtering and
-/// sorting via query parameters. The <see cref="HttpClient"/> is expected to have
-/// its <see cref="HttpClient.BaseAddress"/> set to the PocketBase base URL, so it
-/// is registered as a typed client via <c>AddHttpClient</c>.
-/// </para>
 /// </summary>
-public sealed class PocketBaseClient(HttpClient http)
+/// <remarks>
+///     <para>
+///         There is one method per collection (pages, posts, events, faqs). Each returns
+///         only records with <c>public = true</c> and leaves filtering and sorting to
+///         PocketBase via query parameters.
+///     </para>
+///     <para>
+///         Responses are deserialized with the web defaults. Date conversion from UTC
+///         to Berlin wall-clock time is declared on the contracts themselves via
+///         <c>[JsonConverter]</c> (e.g. <see cref="Event.Start"/>, <see cref="Post.Date"/>),
+///         so no serializer options are configured here.
+///     </para>
+///     <para>
+///         Register the class as a typed client via <c>AddHttpClient</c>, with
+///         <see cref="HttpClient.BaseAddress"/> set to the PocketBase base URL.
+///     </para>
+/// </remarks>
+/// <param name="httpClient">
+///     The HTTP client; its <see cref="HttpClient.BaseAddress"/> must point to PocketBase.
+/// </param>
+public sealed class PocketBaseClient(HttpClient httpClient)
 {
-    private static readonly JsonSerializerOptions JsonOptions = CreateJsonOptions();
+    /// <summary>
+    ///     Gets all public pages, ordered by <see cref="Page.Order"/>.
+    /// </summary>
+    /// <param name="token">
+    ///     A token to cancel the request.
+    /// </param>
+    /// <returns>
+    ///     The public pages, or an empty list if there are none.
+    /// </returns>
+    /// <exception cref="PocketBaseUnavailableException">
+    ///     PocketBase could not be reached, timed out, or returned an unreadable response.
+    /// </exception>
+    /// <exception cref="OperationCanceledException">
+    ///     <paramref name="token"/> was canceled by the caller.
+    /// </exception>
+    public Task<IReadOnlyList<Page>> GetPagesAsync(CancellationToken token = default)
+        => GetRecordsAsync<Page>("pages", "order", token);
 
-    private static JsonSerializerOptions CreateJsonOptions()
-    {
-        var options = new JsonSerializerOptions
-        {
-            PropertyNameCaseInsensitive = true,
-        };
-        options.Converters.Add(new LocalDateTimeConverter());
-        options.Converters.Add(new NullableLocalDateTimeConverter());
-        return options;
-    }
+    /// <summary>
+    ///     Gets all public posts, ordered by <see cref="Post.Date"/>, newest first.
+    /// </summary>
+    /// <inheritdoc cref="GetPagesAsync" path="/param"/>
+    /// <returns>
+    ///     The public posts, or an empty list if there are none.
+    /// </returns>
+    /// <inheritdoc cref="GetPagesAsync" path="/exception"/>
+    public Task<IReadOnlyList<Post>> GetPostsAsync(CancellationToken token = default)
+        => GetRecordsAsync<Post>("posts", "-date", token);
 
-    /// <summary>Gets all public pages, ordered for navigation.</summary>
-    public Task<IReadOnlyList<Page>> GetPagesAsync(CancellationToken ct = default)
-        => GetRecordsAsync<Page>("pages", "order", ct);
+    /// <summary>
+    ///     Gets all public events, ordered by <see cref="Event.Start"/>, earliest first.
+    /// </summary>
+    /// <inheritdoc cref="GetPagesAsync" path="/param"/>
+    /// <returns>
+    ///     The public events, or an empty list if there are none.
+    /// </returns>
+    /// <inheritdoc cref="GetPagesAsync" path="/exception"/>
+    public Task<IReadOnlyList<Event>> GetEventsAsync(CancellationToken token = default)
+        => GetRecordsAsync<Event>("events", "start", token);
 
-    /// <summary>Gets all public posts, newest first.</summary>
-    public Task<IReadOnlyList<Post>> GetPostsAsync(CancellationToken ct = default)
-        => GetRecordsAsync<Post>("posts", "-date", ct);
+    /// <summary>
+    ///     Gets all public FAQ entries, ordered by <see cref="Faq.Topic"/>, then by
+    ///     <see cref="Faq.Question"/>.
+    /// </summary>
+    /// <remarks>
+    ///     The second sort key makes the order total: sorting by topic alone leaves
+    ///     entries within a topic in an undefined order, so the same content could
+    ///     render differently between requests. Adding the question as a tie-breaker
+    ///     keeps the FAQ list and any teaser drawn from it stable.
+    /// </remarks>
+    /// <inheritdoc cref="GetPagesAsync" path="/param"/>
+    /// <returns>
+    ///     The public FAQ entries, or an empty list if there are none.
+    /// </returns>
+    /// <inheritdoc cref="GetPagesAsync" path="/exception"/>
+    public Task<IReadOnlyList<Faq>> GetFaqsAsync(CancellationToken token = default)
+        => GetRecordsAsync<Faq>("faqs", "topic,question", token);
 
-    /// <summary>Gets all public events, earliest start first.</summary>
-    public Task<IReadOnlyList<Event>> GetEventsAsync(CancellationToken ct = default)
-        => GetRecordsAsync<Event>("events", "start", ct);
-
-    /// <summary>Gets all public FAQ entries.</summary>
-    public Task<IReadOnlyList<Faq>> GetFaqsAsync(CancellationToken ct = default)
-        => GetRecordsAsync<Faq>("faqs", "topic", ct);
-
-    private async Task<IReadOnlyList<T>> GetRecordsAsync<T>(string collection, string sort, CancellationToken ct)
+    /// <summary>
+    ///     Gets all public records of a collection in a single request.
+    /// </summary>
+    /// <typeparam name="T">
+    ///     The record type to deserialize into.
+    /// </typeparam>
+    /// <param name="collection">
+    ///     The PocketBase collection name, e.g. <c>"posts"</c>.
+    /// </param>
+    /// <param name="sort">
+    ///     The PocketBase sort expression; a leading <c>-</c> sorts descending.
+    /// </param>
+    /// <param name="token">
+    ///     A token to cancel the request.
+    /// </param>
+    /// <returns>
+    ///     The public records, or an empty list if there are none.
+    /// </returns>
+    /// <exception cref="PocketBaseUnavailableException">
+    ///     PocketBase could not be reached, timed out, or returned an unreadable response.
+    /// </exception>
+    /// <exception cref="OperationCanceledException">
+    ///     <paramref name="token"/> was canceled by the caller.
+    /// </exception>
+    private async Task<IReadOnlyList<T>> GetRecordsAsync<T>(
+        string collection,
+        string sort,
+        CancellationToken token)
     {
         // filter=public=true keeps drafts out; perPage is large enough to fetch
         // every record in a single page given the small content volume.
@@ -53,7 +122,25 @@ public sealed class PocketBaseClient(HttpClient http)
                   + $"?perPage=500&filter={Uri.EscapeDataString("public=true")}"
                   + $"&sort={Uri.EscapeDataString(sort)}";
 
-        var result = await http.GetFromJsonAsync<RecordList<T>>(url, JsonOptions, ct);
+        try
+        {
+            var result = await httpClient.GetFromJsonAsync<RecordList<T>>(url, token);
             return result?.Items ?? [];
         }
+        // These three mean PocketBase itself failed: it was unreachable
+        // (HttpRequestException), the request to it timed out (a TaskCanceledException
+        // whose inner exception is a TimeoutException, which is how HttpClient surfaces
+        // its own timeout), or it answered with something we could not read
+        // (JsonException). A plain TaskCanceledException with no inner TimeoutException
+        // is the caller's own cancellation via token and is deliberately not caught --
+        // it propagates as OperationCanceledException so an aborted request stays an
+        // abort, not a fault.
+        catch (Exception exception) when (
+            exception is HttpRequestException
+                or JsonException
+                or TaskCanceledException { InnerException: TimeoutException })
+        {
+            throw new PocketBaseUnavailableException($"Could not read collection '{collection}'.", exception);
+        }
+    }
 }

Elternbeirat.PocketBase/PocketBaseUnavailableException.cs

@@ -0,0 +1,49 @@
+namespace Elternbeirat.PocketBase;
+
+/// <summary>
+///     Thrown when PocketBase could not be reached, timed out, or returned a
+///     response that could not be read.
+/// </summary>
+/// <remarks>
+///     This is the one failure the content pages need to distinguish: the site is
+///     up but its data store is not, which is an HTTP 503, not a 404. Which
+///     low-level exceptions mean that (a transport error, a timeout, unreadable
+///     JSON) is <see cref="PocketBaseClient"/>'s concern; callers catch only this
+///     type and need not know how the client talks to PocketBase.
+/// </remarks>
+public sealed class PocketBaseUnavailableException : Exception
+{
+    /// <summary>
+    ///     Initializes a new instance with a default message.
+    /// </summary>
+    public PocketBaseUnavailableException()
+        : base("PocketBase is unavailable.")
+    {
+    }
+
+    /// <summary>
+    ///     Initializes a new instance with the given message.
+    /// </summary>
+    /// <param name="message">
+    ///     The message that describes the error.
+    /// </param>
+    public PocketBaseUnavailableException(string message)
+        : base(message)
+    {
+    }
+
+    /// <summary>
+    ///     Initializes a new instance with the given message and the underlying
+    ///     failure that caused it.
+    /// </summary>
+    /// <param name="message">
+    ///     The message that describes the error.
+    /// </param>
+    /// <param name="innerException">
+    ///     The transport, timeout, or deserialization exception that was caught.
+    /// </param>
+    public PocketBaseUnavailableException(string message, Exception innerException)
+        : base(message, innerException)
+    {
+    }
+}

Elternbeirat.PocketBase/RecordList.cs

@@ -3,13 +3,25 @@ using System.Text.Json.Serialization;
 namespace Elternbeirat.PocketBase;
 
 /// <summary>
-/// The envelope PocketBase wraps a records list response in. Only <see cref="Items"/>
-/// is used; the paging fields are ignored because content volumes are small and the
-/// client requests a large page size in a single call.
+///     The envelope PocketBase wraps a records list response in.
 /// </summary>
-/// <typeparam name="T">The record type inside <c>items</c>.</typeparam>
+/// <remarks>
+///     Only <see cref="Items"/> is mapped. The paging fields (<c>page</c>,
+///     <c>perPage</c>, <c>totalItems</c>, <c>totalPages</c>) are ignored, because
+///     content volumes are small and <see cref="PocketBaseClient"/> fetches every
+///     record in a single request.
+/// </remarks>
+/// <typeparam name="T">
+///     The record type inside <c>items</c>.
+/// </typeparam>
 internal sealed record RecordList<T>
 {
+    /// <summary>
+    ///     Gets the records of the requested page.
+    /// </summary>
+    /// <value>
+    ///     The records, or an empty list if the collection has no matching records.
+    /// </value>
     [JsonPropertyName("items")]
     public IReadOnlyList<T> Items { get; init; } = [];
 }

Elternbeirat.Web.Tests/NavBuilderTests.cs

@@ -8,8 +8,10 @@ namespace Elternbeirat.Web.Tests;
 /// </summary>
 public class NavBuilderTests
 {
+    // Id is required on the record but irrelevant to navigation, so a fixed
+    // placeholder keeps these cases focused on slug/location/order/title.
     private static Page Page(string slug, string location, double order, string title) =>
-        new() { Slug = slug, Location = location, Order = order, Title = title };
+        new() { Id = "test", Slug = slug, Location = location, Order = order, Title = title };
 
     [Fact]
     public void Header_keeps_only_header_pages_ordered_by_order()

Elternbeirat.Web.Tests/PocketBaseClientTests.cs

@@ -19,18 +19,18 @@ public sealed class PocketBaseClientTests(PocketBaseFixture pocketBase)
 
         // Two seeded events, earliest start first.
         events.Select(e => e.Title).ShouldBe(["Elternbeiratssitzung", "Herbstbasar"]);
-        events.ShouldAllBe(e => e.Public);
     }
 
     [Fact]
-    public async Task Event_time_is_read_as_wall_clock_not_shifted()
+    public async Task Event_utc_is_converted_to_berlin_wall_clock()
     {
         var client = pocketBase.CreateClient();
 
         var events = await client.GetEventsAsync();
 
-        // The meeting is seeded as 19:30; by the timezone convention the number is
-        // taken at face value, so no shift to 20:30/21:30 happens.
+        // The meeting is seeded as 17:30Z. October is summer time (UTC+2), so the
+        // converter turns it into 19:30 Berlin wall-clock -- the time an editor
+        // entered in the admin form.
         var meeting = events.FirstOrDefault(e =>
             e.Title.Contains("Elternbeiratssitzung", StringComparison.Ordinal));
         meeting.ShouldNotBeNull();
@@ -63,6 +63,20 @@ public sealed class PocketBaseClientTests(PocketBaseFixture pocketBase)
         posts.Select(p => p.Title).ShouldBe(["Neuer Vorstand", "Neue Sporthalle"]);
     }
 
+    [Fact]
+    public async Task Post_date_is_the_berlin_calendar_day()
+    {
+        var client = pocketBase.CreateClient();
+
+        var posts = await client.GetPostsAsync();
+
+        // The post is seeded as 2026-03-01 23:30Z, which is 2 March 00:30 in Berlin.
+        // The date is the Berlin day the editor picked (2 March), not the raw UTC
+        // day (1 March) -- the time zone is applied before the day is taken.
+        var post = posts.Single(p => p.Title == "Neuer Vorstand");
+        post.Date.ShouldBe(new DateOnly(2026, 3, 2));
+    }
+
     [Fact]
     public async Task Pages_exclude_non_public_records()
     {
@@ -97,7 +111,7 @@ public sealed class PocketBaseClientTests(PocketBaseFixture pocketBase)
 
         var faqs = await client.GetFaqsAsync();
 
-        faqs.Select(f => f.Topic).ShouldBe(["mensa", "schliessfach"], ignoreOrder: true);
+        faqs.Select(f => f.Topic).ShouldBe(["Mensa und Mittagessen", "Schließfächer"], ignoreOrder: true);
         faqs.ShouldAllBe(f => !string.IsNullOrWhiteSpace(f.Question));
     }
 }

Elternbeirat.Web.Tests/PocketBaseFixture.cs

@@ -283,10 +283,13 @@ public sealed class PocketBaseFixture : IAsyncLifetime
             order = 9, slug = "draft", embed = Array.Empty<string>(), @public = false,
         });
 
-        // Posts: newest first once sorted by -date.
+        // Posts: newest first once sorted by -date. The first post is stored as
+        // 2026-03-01 23:30Z on purpose: that is 2 March 00:30 in Berlin (winter,
+        // UTC+1). An editor who picked 2 March must get 2 March back -- the date is
+        // the Berlin day, so it must NOT be read as the raw UTC day (1 March).
         await CreateRecordAsync(http, "posts", new
         {
-            date = "2026-03-01 00:00:00.000Z", title = "Neuer Vorstand",
+            date = "2026-03-01 23:30:00.000Z", title = "Neuer Vorstand",
             body = "Text", slug = "new-board", @public = true,
         });
         await CreateRecordAsync(http, "posts", new
@@ -295,15 +298,18 @@ public sealed class PocketBaseFixture : IAsyncLifetime
             body = "Text", slug = "new-hall", @public = true,
         });
 
-        // Events: the meeting carries the wall-clock time the timezone test checks.
+        // Events: PocketBase stores UTC. The meeting is 19:30 Berlin; October is
+        // summer time (UTC+2), so it is stored as 17:30Z and the timezone test
+        // expects 19:30 back. The Herbstbasar is 09:00-13:00 Berlin in November
+        // (winter, UTC+1), stored as 08:00Z-12:00Z.
         await CreateRecordAsync(http, "events", new
         {
-            start = "2026-10-08 19:30:00.000Z", title = "Elternbeiratssitzung",
+            start = "2026-10-08 17:30:00.000Z", title = "Elternbeiratssitzung",
             location = "Aula", note = "", @public = true,
         });
         await CreateRecordAsync(http, "events", new
         {
-            start = "2026-11-22 09:00:00.000Z", end = "2026-11-22 13:00:00.000Z",
+            start = "2026-11-22 08:00:00.000Z", end = "2026-11-22 12:00:00.000Z",
             title = "Herbstbasar", location = "Schulhof", note = "", @public = true,
         });
 
@@ -311,12 +317,12 @@ public sealed class PocketBaseFixture : IAsyncLifetime
         await CreateRecordAsync(http, "faqs", new
         {
             question = "Wann gibt es Mittagessen?", answer = "Um 12 Uhr.",
-            topic = "mensa", @public = true,
+            topic = "Mensa und Mittagessen", @public = true,
         });
         await CreateRecordAsync(http, "faqs", new
         {
             question = "Wie viel kostet ein Schließfach?", answer = "20 Euro.",
-            topic = "schliessfach", @public = true,
+            topic = "Schließfächer", @public = true,
         });
     }
 
@@ -329,6 +335,6 @@ public sealed class PocketBaseFixture : IAsyncLifetime
     private sealed record AuthResponse
     {
         [System.Text.Json.Serialization.JsonPropertyName("token")]
-        public string Token { get; init; } = "";
+        public string Token { get; init; } = string.Empty;
     }
 }

Elternbeirat.Web/Components/Layout/MainLayout.razor.cs

@@ -6,14 +6,19 @@ namespace Elternbeirat.Web.Components.Layout;
 
 public partial class MainLayout
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load navigation pages from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load navigation pages from PocketBase; the menu is empty.")]
+    private static partial void LogSourceUnavailable(ILogger logger, Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<MainLayout> Logger { get; set; } = default!;
+    private ILogger<MainLayout> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<NavLinkItem> _header = [];
     private IReadOnlyList<NavLinkItem> _footer = [];
@@ -22,15 +27,15 @@ public partial class MainLayout
     {
         try
         {
-            var pages = await PocketBase.GetPagesAsync();
+            var pages = await PocketBase.GetPagesAsync(HttpContext?.RequestAborted ?? default);
             _header = NavBuilder.Header(pages);
             _footer = NavBuilder.Footer(pages);
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException ex)
         {
-            // Source unreachable -> render the chrome with an empty menu instead of
-            // a 500. The brand link still leads home.
-            LogLoadFailed(Logger, ex);
+            // Only the menu fails: render the chrome with an empty menu instead of a
+            // 500, so every page stays reachable. The brand link still leads home.
+            LogSourceUnavailable(Logger, ex);
         }
     }
 }

Elternbeirat.Web/Features/Embeds/EventsEmbed.razor

@@ -1,12 +1,7 @@
+@if (_upcoming.Count > 0)
+{
     <section class="embed embed-events">
         <h2>Kommende Termine</h2>
-
-    @if (_upcoming.Count == 0)
-    {
-        <p>Zurzeit sind keine Termine geplant.</p>
-    }
-    else
-    {
         <ul class="event-list">
             @foreach (var ev in _upcoming)
             {
@@ -21,5 +16,5 @@
             }
         </ul>
         <p class="embed-more"><a href="/events">Alle Termine <span aria-hidden="true">&rarr;</span></a></p>
-    }
     </section>
+}

Elternbeirat.Web/Features/Embeds/EventsEmbed.razor.cs

@@ -6,14 +6,24 @@ namespace Elternbeirat.Web.Features.Embeds;
 
 public partial class EventsEmbed
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load events for an embed from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    // Number of upcoming events shown in the teaser; the full list is one link away.
+    private const int TeaserCount = 3;
+
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load events for an embed from PocketBase; the teaser is omitted.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<EventsEmbed> Logger { get; set; } = default!;
+    private ILogger<EventsEmbed> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Event> _upcoming = [];
 
@@ -22,22 +32,25 @@ public partial class EventsEmbed
         IReadOnlyList<Event> events;
         try
         {
-            events = await PocketBase.GetEventsAsync();
+            events = await PocketBase.GetEventsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show no teaser instead of a 500.
-            LogLoadFailed(Logger, ex);
+            // Only part of the page fails: omit the teaser, keep the page (and its
+            // 200) intact. A missing teaser is degraded, not broken.
+            LogSourceUnavailable(Logger, exception);
             return;
         }
 
-        // Teaser: the three soonest upcoming events, earliest first. An event
-        // earlier today still counts as upcoming.
+        // Teaser: the soonest upcoming events, earliest first. An event earlier
+        // today still counts as upcoming.
         var today = DateOnly.FromDateTime(DateTime.Today);
-        _upcoming = events
-            .Where(e => DateOnly.FromDateTime(e.Start) >= today)
-            .OrderBy(e => e.Start)
-            .Take(3)
-            .ToList();
+        _upcoming =
+        [
+            .. events
+                .Where(@event => DateOnly.FromDateTime(@event.Start) >= today)
+                .OrderBy(@event => @event.Start)
+                .Take(TeaserCount)
+        ];
     }
 }

Elternbeirat.Web/Features/Embeds/FaqsEmbed.razor

@@ -1,12 +1,7 @@
+@if (_faqs.Count > 0)
+{
     <section class="embed embed-faqs">
         <h2>Häufige Fragen</h2>
-
-    @if (_faqs.Count == 0)
-    {
-        <p>Zurzeit gibt es keine Fragen.</p>
-    }
-    else
-    {
         @foreach (var faq in _faqs)
         {
             <details class="faq-item">
@@ -17,5 +12,5 @@
             </details>
         }
         <p class="embed-more"><a href="/faqs">Alle Fragen <span aria-hidden="true">&rarr;</span></a></p>
-    }
     </section>
+}

Elternbeirat.Web/Features/Embeds/FaqsEmbed.razor.cs

@@ -6,14 +6,24 @@ namespace Elternbeirat.Web.Features.Embeds;
 
 public partial class FaqsEmbed
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load FAQs for an embed from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    // Number of questions shown in the teaser; the full hub is one link away.
+    private const int TeaserCount = 3;
+
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load FAQs for an embed from PocketBase; the teaser is omitted.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<FaqsEmbed> Logger { get; set; } = default!;
+    private ILogger<FaqsEmbed> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Faq> _faqs = [];
 
@@ -21,14 +31,16 @@ public partial class FaqsEmbed
     {
         try
         {
-            // Teaser: the first three questions, with a link to the full hub.
-            var faqs = await PocketBase.GetFaqsAsync();
-            _faqs = [.. faqs.Take(3)];
+            // GetFaqsAsync is ordered by topic, then question, so the first entries
+            // the teaser takes are stable across requests.
+            var faqs = await PocketBase.GetFaqsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
+            _faqs = [.. faqs.Take(TeaserCount)];
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show no teaser instead of a 500.
-            LogLoadFailed(Logger, ex);
+            // Only part of the page fails: omit the teaser, keep the page (and its
+            // 200) intact. A missing teaser is degraded, not broken.
+            LogSourceUnavailable(Logger, exception);
         }
     }
 }

Elternbeirat.Web/Features/Embeds/PostsEmbed.razor

@@ -1,23 +1,18 @@
+@if (_latest.Count > 0)
+{
     <section class="embed embed-posts">
         <h2>Aktuelle Beiträge</h2>
-
-    @if (_latest.Count == 0)
-    {
-        <p>Zurzeit gibt es keine Beiträge.</p>
-    }
-    else
-    {
         <ul class="post-list">
             @foreach (var post in _latest)
             {
                 <li>
                     <a href="@($"/posts/{post.Slug}")">@post.Title</a>
-                    <time datetime="@post.Date.ToString("yyyy-MM-dd")">
-                        @post.Date.ToString("d. MMMM yyyy", German)
+                    <time datetime="@post.Date.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture)">
+                        @post.Date.ToString("d. MMMM yyyy", Cultures.German)
                     </time>
                 </li>
             }
         </ul>
         <p class="embed-more"><a href="/posts">Alle Beiträge <span aria-hidden="true">&rarr;</span></a></p>
-    }
     </section>
+}

Elternbeirat.Web/Features/Embeds/PostsEmbed.razor.cs

@@ -1,4 +1,3 @@
-using System.Globalization;
 using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
 using Microsoft.AspNetCore.Components;
@@ -7,16 +6,24 @@ namespace Elternbeirat.Web.Features.Embeds;
 
 public partial class PostsEmbed
 {
-    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+    // Number of posts shown in the teaser; the full list is one link away.
+    private const int TeaserCount = 3;
 
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load posts for an embed from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load posts for an embed from PocketBase; the teaser is omitted.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<PostsEmbed> Logger { get; set; } = default!;
+    private ILogger<PostsEmbed> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Post> _latest = [];
 
@@ -24,14 +31,15 @@ public partial class PostsEmbed
     {
         try
         {
-            // Teaser: the three most recent posts, with a link to the full list.
-            var posts = await PocketBase.GetPostsAsync();
-            _latest = [.. posts.Take(3)];
+            // GetPostsAsync returns newest first, so the first entries are the latest.
+            var posts = await PocketBase.GetPostsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
+            _latest = [.. posts.Take(TeaserCount)];
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show no teaser instead of a 500.
-            LogLoadFailed(Logger, ex);
+            // Only part of the page fails: omit the teaser, keep the page (and its
+            // 200) intact. A missing teaser is degraded, not broken.
+            LogSourceUnavailable(Logger, exception);
         }
     }
 }

Elternbeirat.Web/Features/Events/EventList.razor

@@ -4,6 +4,12 @@
 
 <h1>Termine</h1>
 
+@if (_unavailable)
+{
+    <p>Die Termine sind gerade nicht erreichbar. Bitte später erneut versuchen.</p>
+}
+else
+{
     <p class="intro">
         Alle Termine des Elternbeirats auf einen Blick. Sie können den Kalender auch
         <a href="/events.ics">abonnieren</a> und in Ihrer Kalender-App automatisch
@@ -54,3 +60,4 @@ else
             }
         </ul>
     }
+}

Elternbeirat.Web/Features/Events/EventList.razor.cs

@@ -1,48 +1,67 @@
 using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
+using Elternbeirat.Web.Shared;
 using Microsoft.AspNetCore.Components;
 
 namespace Elternbeirat.Web.Features.Events;
 
 public partial class EventList
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load events from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Error,
+        Message = "Could not load events from PocketBase; content source is unavailable.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<EventList> Logger { get; set; } = default!;
+    private ILogger<EventList> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Event> _upcoming = [];
     private IReadOnlyList<Event> _past = [];
 
+    // Set when the content source could not be reached or read. The markup then
+    // shows a "temporarily unavailable" note instead of "no events", matching the
+    // 503 this sets on the response.
+    private bool _unavailable;
+
     protected override async Task OnInitializedAsync()
     {
         IReadOnlyList<Event> events;
         try
         {
-            events = await PocketBase.GetEventsAsync();
+            events = await PocketBase.GetEventsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show empty sections instead of a 500. The page
-            // stays up; the "keine Termine" note is rendered.
-            LogLoadFailed(Logger, ex);
+            // Empty sections would claim there are no events. The site works, its
+            // data store is down: 503 and an honest note.
+            LogSourceUnavailable(Logger, exception);
+            _unavailable = true;
+            SourceUnavailable.SetStatus(HttpContext);
             return;
         }
 
         // Split into upcoming and past by date, so an event earlier today still
         // counts as upcoming. Upcoming earliest first, past most recent first.
         var today = DateOnly.FromDateTime(DateTime.Today);
-        _upcoming = events
-            .Where(e => DateOnly.FromDateTime(e.Start) >= today)
-            .OrderBy(e => e.Start)
-            .ToList();
-        _past = events
-            .Where(e => DateOnly.FromDateTime(e.Start) < today)
-            .OrderByDescending(e => e.Start)
-            .ToList();
+        _upcoming =
+        [
+            .. events
+                .Where(@event => DateOnly.FromDateTime(@event.Start) >= today)
+                .OrderBy(@event => @event.Start)
+        ];
+        _past =
+        [
+            .. events
+                .Where(@event => DateOnly.FromDateTime(@event.Start) < today)
+                .OrderByDescending(@event => @event.Start)
+        ];
     }
 }

Elternbeirat.Web/Features/Events/IcsCalendar.cs

@@ -45,7 +45,7 @@ public static class IcsCalendar
         // between requests, so caches and clients do not see spurious changes.
         AppendLine(sb, "DTSTAMP:20000101T000000Z");
 
-        if (HasTime(ev))
+        if (ev.HasTime)
         {
             AppendLine(sb, $"DTSTART:{Local(ev.Start)}");
             if (ev.End is { } end)
@@ -75,12 +75,6 @@ public static class IcsCalendar
         AppendLine(sb, "END:VEVENT");
     }
 
-    /// <summary>
-    /// An entry counts as all-day when its start has no wall-clock time (00:00).
-    /// PocketBase has no separate flag; the convention is a midnight start.
-    /// </summary>
-    private static bool HasTime(Event ev) => ev.Start.TimeOfDay != TimeSpan.Zero;
-
     /// <summary>
     /// A UID that stays the same as long as the entry's title and start do, so a
     /// re-subscribe updates the event instead of creating a duplicate.

Elternbeirat.Web/Features/Faqs/FaqList.razor

@@ -4,7 +4,11 @@
 
 <h1>Häufige Fragen</h1>
 
-@if (_groups.Count == 0)
+@if (_unavailable)
+{
+    <p>Die Fragen sind gerade nicht erreichbar. Bitte später erneut versuchen.</p>
+}
+else if (_groups.Count == 0)
 {
     <p>Zurzeit gibt es keine Fragen.</p>
 }
@@ -13,7 +17,7 @@ else
     @foreach (var group in _groups)
     {
         <section class="faq-topic">
-            <h2>@TopicLabel(group.Key)</h2>
+            <h2>@group.Key</h2>
             @foreach (var faq in group)
             {
                 <details class="faq-item">

Elternbeirat.Web/Features/Faqs/FaqList.razor.cs

@@ -1,48 +1,49 @@
 using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
+using Elternbeirat.Web.Shared;
 using Microsoft.AspNetCore.Components;
 
 namespace Elternbeirat.Web.Features.Faqs;
 
 public partial class FaqList
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load FAQs from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
-
-    // German heading per topic. Unknown topics fall back to the raw key so a new
-    // topic in PocketBase still shows up rather than being silently dropped.
-    private static readonly Dictionary<string, string> TopicLabels =
-        new(StringComparer.Ordinal)
-        {
-            ["mensa"] = "Mensa und Mittagessen",
-            ["schliessfach"] = "Schließfächer",
-            ["elterneuro"] = "Eltern-Euro",
-            ["elternarbeit"] = "Elternarbeit und Mitmachen",
-        };
+    [LoggerMessage(
+        Level = LogLevel.Error,
+        Message = "Could not load FAQs from PocketBase; content source is unavailable.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<FaqList> Logger { get; set; } = default!;
+    private ILogger<FaqList> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<IGrouping<string, Faq>> _groups = [];
 
+    // Set when the content source could not be reached or read. The markup then
+    // shows a "temporarily unavailable" note instead of "no questions", matching
+    // the 503 this sets on the response.
+    private bool _unavailable;
+
     protected override async Task OnInitializedAsync()
     {
         try
         {
-            var faqs = await PocketBase.GetFaqsAsync();
+            var faqs = await PocketBase.GetFaqsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
             _groups = [.. faqs.GroupBy(faq => faq.Topic)];
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show an empty page instead of a 500. The page
-            // stays up; the "keine Fragen" note is rendered.
-            LogLoadFailed(Logger, ex);
+            // An empty page would claim there are no questions. The site works, its
+            // data store is down: 503 and an honest note.
+            LogSourceUnavailable(Logger, exception);
+            _unavailable = true;
+            SourceUnavailable.SetStatus(HttpContext);
         }
     }
-
-    private static string TopicLabel(string topic) =>
-        TopicLabels.TryGetValue(topic, out var label) ? label : topic;
 }

Elternbeirat.Web/Features/Home/Home.razor.cs

@@ -1,3 +1,4 @@
+using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
 using Microsoft.AspNetCore.Components;
 
@@ -5,14 +6,21 @@ namespace Elternbeirat.Web.Features.Home;
 
 public partial class Home
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load the home page from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load the home page from PocketBase; embeds are omitted.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<Home> Logger { get; set; } = default!;
+    private ILogger<Home> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     // Which dynamic blocks the home page shows is editorial: it comes from the
     // "home" page's embed field in PocketBase, not from hard-coded markup.
@@ -22,15 +30,15 @@ public partial class Home
     {
         try
         {
-            var pages = await PocketBase.GetPagesAsync();
-            var home = pages.FirstOrDefault(
-                p => string.Equals(p.Slug, "home", StringComparison.Ordinal));
+            var pages = await PocketBase.GetPagesAsync(HttpContext?.RequestAborted ?? default);
+            var home = pages.FirstOrDefault(page => Page.IsHomeSlug(page.Slug));
             _embed = home?.Embed ?? [];
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> render the intro without embeds instead of a 500.
-            LogLoadFailed(Logger, ex);
+            // Only the embeds fail: render the static intro without them instead of a
+            // 500. The home page's own text is markup, so it stays intact.
+            LogSourceUnavailable(Logger, exception);
         }
     }
 }

Elternbeirat.Web/Features/Layout/NavBuilder.cs

@@ -17,7 +17,9 @@ public static class NavBuilder
     public static IReadOnlyList<NavLinkItem> Footer(IReadOnlyList<Page> pages) =>
         Build(pages, "footer");
 
-    private static List<NavLinkItem> Build(IReadOnlyList<Page> pages, string location) =>
+    private static List<NavLinkItem> Build(
+        IReadOnlyList<Page> pages,
+        string location) =>
         [.. pages
             .Where(page => string.Equals(page.Location, location, StringComparison.Ordinal))
             .OrderBy(page => page.Order)
@@ -27,5 +29,5 @@ public static class NavBuilder
     // reached at "/{slug}", where either a literal route or the catch-all content
     // page renders it.
     private static string HrefFor(string slug) =>
-        string.Equals(slug, "home", StringComparison.Ordinal) ? "/" : $"/{slug}";
+        Page.IsHomeSlug(slug) ? "/" : $"/{slug}";
 }

Elternbeirat.Web/Features/Pages/ContentPage.razor

@@ -1,14 +1,15 @@
 @page "/{Slug}"
 
-@if (_page is null)
+@if (_unavailable)
 {
-    <PageTitle>Nicht gefunden</PageTitle>
+    <PageTitle>Vorübergehend nicht erreichbar</PageTitle>
+    <p>Die Seite ist gerade nicht erreichbar. Bitte später erneut versuchen.</p>
 }
-else
+else if (_page is not null)
 {
     <PageTitle>@_page.Title</PageTitle>
-    <article>
-        @Body
-    </article>
+    <article>@Body</article>
     <PageEmbeds Embed="_page.Embed" />
 }
+@* No page and not unavailable: the slug was unknown; NavigationManager.NotFound()
+   already ran in OnParametersSetAsync and renders the not-found page. *@

Elternbeirat.Web/Features/Pages/ContentPage.razor.cs

@@ -2,29 +2,41 @@ using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
 using Elternbeirat.Web.Shared;
 using Microsoft.AspNetCore.Components;
-using Microsoft.AspNetCore.Http;
 
 namespace Elternbeirat.Web.Features.Pages;
 
 public partial class ContentPage
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load page '{slug}' from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, string slug, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Error,
+        Message = "Could not load page '{Slug}' from PocketBase; content source is unavailable.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        string slug,
+        Exception exception);
 
     [Parameter]
-    public string Slug { get; set; } = "";
+    public string Slug { get; set; } = string.Empty;
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<ContentPage> Logger { get; set; } = default!;
+    private ILogger<ContentPage> Logger { get; set; } = null!;
+
+    [Inject]
+    private NavigationManager Navigation { get; set; } = null!;
 
     [CascadingParameter]
     private HttpContext? HttpContext { get; set; }
 
     private Page? _page;
 
+    // Set when the content source could not be reached or read. The markup then
+    // shows a "temporarily unavailable" note instead of a not-found page, matching
+    // the 503 this sets on the response.
+    private bool _unavailable;
+
     // The page body rendered from Markdown to HTML, ready to emit as a
     // MarkupString in the markup.
     private MarkupString Body => (MarkupString)Markdown.ToHtml(_page?.Body);
@@ -33,24 +45,23 @@ public partial class ContentPage
     {
         try
         {
-            var pages = await PocketBase.GetPagesAsync();
+            var pages = await PocketBase.GetPagesAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
             _page = pages.FirstOrDefault(
-                p => string.Equals(p.Slug, Slug, StringComparison.OrdinalIgnoreCase));
+                page => string.Equals(page.Slug, Slug, StringComparison.OrdinalIgnoreCase));
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> treat as "not found" rather than a 500. The
-            // 404 branch below serves the friendly /not-found page.
-            LogLoadFailed(Logger, Slug, ex);
-            _page = null;
+            // The site works, its data store is down: 503, not 404.
+            LogSourceUnavailable(Logger, Slug, exception);
+            _unavailable = true;
+            SourceUnavailable.SetStatus(HttpContext);
+            return;
         }
 
-        // Unknown slug (or unreachable source) -> 404, so
-        // UseStatusCodePagesWithReExecute serves the /not-found page instead of an
-        // empty 200 response.
-        if (_page is null && HttpContext is not null)
+        if (_page is null)
         {
-            HttpContext.Response.StatusCode = StatusCodes.Status404NotFound;
+            // The source answered, but there is no page with this slug: a genuine 404.
+            Navigation.NotFound();
         }
     }
 }

Elternbeirat.Web/Features/Posts/PostDetail.razor

@@ -1,19 +1,22 @@
 @page "/posts/{Slug}"
 
-@if (_post is null)
+@if (_unavailable)
 {
-    <PageTitle>Nicht gefunden</PageTitle>
+    <PageTitle>Vorübergehend nicht erreichbar</PageTitle>
+    <p>Der Beitrag ist gerade nicht erreichbar. Bitte später erneut versuchen.</p>
 }
-else
+else if (_post is not null)
 {
     <PageTitle>@_post.Title</PageTitle>
-    <article>
-        <p class="post-meta">
+    <nav>
         <a href="/posts">&larr; Alle Beiträge</a>
-            <time datetime="@_post.Date.ToString("yyyy-MM-dd")">
-                @_post.Date.ToString("d. MMMM yyyy", German)
+    </nav>
+    <article>
+        <time class="post-meta" datetime="@_post.Date.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture)">
+            @_post.Date.ToString("d. MMMM yyyy", Cultures.German)
         </time>
-        </p>
         @Body
     </article>
 }
+@* No post and not unavailable: the slug was unknown; NavigationManager.NotFound()
+   already ran in OnParametersSetAsync and renders the not-found page. *@

Elternbeirat.Web/Features/Posts/PostDetail.razor.cs

@@ -1,33 +1,42 @@
-using System.Globalization;
 using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
 using Elternbeirat.Web.Shared;
 using Microsoft.AspNetCore.Components;
-using Microsoft.AspNetCore.Http;
 
 namespace Elternbeirat.Web.Features.Posts;
 
 public partial class PostDetail
 {
-    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
-
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load post '{slug}' from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, string slug, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Error,
+        Message = "Could not load post '{Slug}' from PocketBase; content source is unavailable.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        string slug,
+        Exception exception);
 
     [Parameter]
-    public string Slug { get; set; } = "";
+    public string Slug { get; set; } = string.Empty;
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<PostDetail> Logger { get; set; } = default!;
+    private ILogger<PostDetail> Logger { get; set; } = null!;
+
+    [Inject]
+    private NavigationManager Navigation { get; set; } = null!;
 
     [CascadingParameter]
     private HttpContext? HttpContext { get; set; }
 
     private Post? _post;
 
+    // Set when the content source could not be reached or read. The markup then
+    // shows a "temporarily unavailable" note instead of a not-found page, matching
+    // the 503 this sets on the response.
+    private bool _unavailable;
+
     // The post body rendered from Markdown to HTML, ready to emit as a
     // MarkupString in the markup.
     private MarkupString Body => (MarkupString)Markdown.ToHtml(_post?.Body);
@@ -36,24 +45,23 @@ public partial class PostDetail
     {
         try
         {
-            var posts = await PocketBase.GetPostsAsync();
+            var posts = await PocketBase.GetPostsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
             _post = posts.FirstOrDefault(
-                p => string.Equals(p.Slug, Slug, StringComparison.OrdinalIgnoreCase));
+                post => string.Equals(post.Slug, Slug, StringComparison.OrdinalIgnoreCase));
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> treat as "not found" rather than a 500. The
-            // 404 branch below serves the friendly /not-found page.
-            LogLoadFailed(Logger, Slug, ex);
-            _post = null;
+            // The site works, its data store is down: 503, not 404.
+            LogSourceUnavailable(Logger, Slug, exception);
+            _unavailable = true;
+            SourceUnavailable.SetStatus(HttpContext);
+            return;
         }
 
-        // Unknown slug (or unreachable source) -> 404, so
-        // UseStatusCodePagesWithReExecute serves the /not-found page instead of an
-        // empty 200 response.
-        if (_post is null && HttpContext is not null)
+        if (_post is null)
         {
-            HttpContext.Response.StatusCode = StatusCodes.Status404NotFound;
+            // The source answered, but there is no post with this slug: a genuine 404.
+            Navigation.NotFound();
         }
     }
 }

Elternbeirat.Web/Features/Posts/PostDetail.razor.css

@@ -1,13 +1,7 @@
 .post-meta {
-    display: flex;
-    justify-content: space-between;
-    align-items: baseline;
-    gap: 1rem;
-    margin-bottom: 1rem;
-}
-
-.post-meta time {
     display: block;
     color: var(--color-text-soft);   /* token, so it adapts in dark mode */
     font-size: 0.85rem;
+    margin-top: 1.5rem;              /* space from the "all posts" link above */
+    margin-bottom: 0.25rem;         /* keep the body close below */
 }

Elternbeirat.Web/Features/Posts/PostList.razor

@@ -4,7 +4,11 @@
 
 <h1>Beiträge</h1>
 
-@if (_posts.Count == 0)
+@if (_unavailable)
+{
+    <p>Die Beiträge sind gerade nicht erreichbar. Bitte später erneut versuchen.</p>
+}
+else if (_posts.Count == 0)
 {
     <p>Zurzeit gibt es keine Beiträge.</p>
 }
@@ -15,8 +19,8 @@ else
         {
             <li>
                 <a href="@($"/posts/{post.Slug}")">@post.Title</a>
-                <time datetime="@post.Date.ToString("yyyy-MM-dd")">
-                    @post.Date.ToString("d. MMMM yyyy", German)
+                <time datetime="@post.Date.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture)">
+                    @post.Date.ToString("d. MMMM yyyy", Cultures.German)
                 </time>
             </li>
         }

Elternbeirat.Web/Features/Posts/PostList.razor.cs

@@ -1,36 +1,48 @@
-using System.Globalization;
 using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
+using Elternbeirat.Web.Shared;
 using Microsoft.AspNetCore.Components;
 
 namespace Elternbeirat.Web.Features.Posts;
 
 public partial class PostList
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load posts from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
-
-    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+    [LoggerMessage(
+        Level = LogLevel.Error,
+        Message = "Could not load posts from PocketBase; content source is unavailable.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<PostList> Logger { get; set; } = default!;
+    private ILogger<PostList> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Post> _posts = [];
 
+    // Set when the content source could not be reached or read. The markup then
+    // shows a "temporarily unavailable" note instead of "no posts", matching the
+    // 503 this sets on the response.
+    private bool _unavailable;
+
     protected override async Task OnInitializedAsync()
     {
         try
         {
-            _posts = await PocketBase.GetPostsAsync();
+            _posts = await PocketBase.GetPostsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show an empty list instead of a 500. The page
-            // stays up; the "keine Beiträge" note is rendered.
-            LogLoadFailed(Logger, ex);
+            // An empty list would claim there are no posts. The site works, its
+            // data store is down: 503 and an honest note.
+            LogSourceUnavailable(Logger, exception);
+            _unavailable = true;
+            SourceUnavailable.SetStatus(HttpContext);
         }
     }
 }

Elternbeirat.Web/Program.cs

@@ -24,23 +24,26 @@ var app = builder.Build();
 // as HTTP and with the proxy IP instead of the client IP.
 // KnownNetworks/KnownProxies are deliberately empty because only NPM reaches
 // the container.
-app.UseForwardedHeaders(new ForwardedHeadersOptions
+app.UseForwardedHeaders(
+    new ForwardedHeadersOptions
     {
-    ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto,
-    KnownIPNetworks = { },
-    KnownProxies = { }
+        ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
     });
 
 // Configure the HTTP request pipeline.
-if (!app.Environment.IsDevelopment())
+if (app.Environment.IsDevelopment() is false)
 {
     app.UseExceptionHandler("/Error", createScopeForErrors: true);
     // No UseHsts() and no UseHttpsRedirection(): NPM sets HSTS and terminates
     // TLS. Both here would create a redirect loop behind the proxy.
 }
 
-app.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);
-
+// No UseStatusCodePagesWithReExecute: the Router renders the NotFoundPage
+// (Pages.NotFound) in process for both an unmatched route and an explicit
+// NavigationManager.NotFound() from a component (see Routes.razor). Re-executing
+// every error code to /not-found would also turn a 503 (content source down) into
+// a "not found" page; leaving it out lets those components keep their own
+// "temporarily unavailable" markup and 503 status.
 app.UseAntiforgery();
 
 app.MapStaticAssets();
@@ -49,14 +52,14 @@ app.MapRazorComponents<App>();
 // Subscribable calendar feed of all events. A minimal API endpoint rather than
 // a Razor page because it returns text/calendar, not HTML. Reads from PocketBase
 // per request; an unreachable source yields an empty calendar, not a 500.
-app.MapGet("/events.ics", async (PocketBaseClient pocketBase) =>
+app.MapGet("/events.ics", async (PocketBaseClient pocketBase, CancellationToken token) =>
 {
     IReadOnlyList<Event> events;
     try
     {
-        events = await pocketBase.GetEventsAsync();
+        events = await pocketBase.GetEventsAsync(token);
     }
-    catch (HttpRequestException)
+    catch (PocketBaseUnavailableException)
     {
         events = [];
     }

Elternbeirat.Web/Shared/Cultures.cs

@@ -0,0 +1,21 @@
+using System.Globalization;
+
+namespace Elternbeirat.Web.Shared;
+
+/// <summary>
+///     Shared <see cref="CultureInfo"/> instances used to format visitor-facing
+///     text.
+/// </summary>
+/// <remarks>
+///     Kept in one place so every component renders month and weekday names the
+///     same way, rather than each holding its own <c>de-DE</c> lookup. This is only
+///     for display text; machine-readable output (e.g. an HTML <c>datetime</c>
+///     attribute) uses <see cref="CultureInfo.InvariantCulture"/> instead.
+/// </remarks>
+internal static class Cultures
+{
+    /// <summary>
+    ///     German culture, for the month and weekday names visitors read.
+    /// </summary>
+    public static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+}

Elternbeirat.Web/Shared/EventFormat.cs

@@ -1,48 +1,77 @@
-using System.Globalization;
 using Elternbeirat.Contracts;
 
 namespace Elternbeirat.Web.Shared;
 
 /// <summary>
-/// Formats an <see cref="Event"/>'s date range for display in German. Shared by
-/// the full event list and the home-page events embed so both render dates the
-/// same way.
+///     Formats the date range of an <see cref="Event"/> for display in German.
 /// </summary>
+/// <remarks>
+///     Shared by the full event list and the home-page events embed, so both render
+///     dates the same way.
+/// </remarks>
 public static class EventFormat
 {
-    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
-
-    // An event counts as all-day when its start carries no wall-clock time
-    // (00:00); PocketBase has no separate flag.
-    private static bool HasTime(Event ev) => ev.Start.TimeOfDay != TimeSpan.Zero;
+    /// <summary>
+    ///     Date format for the start, and for a single-day event.
+    /// </summary>
+    private const string LongDate = "dddd, d. MMMM yyyy";
 
     /// <summary>
-    /// Formats the entry's date range: a single day, a date with a time, or a
-    /// span across days.
+    ///     Date format for the end of a multi-day event; the weekday is omitted.
     /// </summary>
-    public static string Range(Event ev)
-    {
-        var start = HasTime(ev)
-            ? ev.Start.ToString("dddd, d. MMMM yyyy, HH:mm", German) + " Uhr"
-            : ev.Start.ToString("dddd, d. MMMM yyyy", German);
+    private const string ShortDate = "d. MMMM yyyy";
 
-        if (ev.End is not { } end)
+    /// <summary>
+    ///     Formats the date range of an event.
+    /// </summary>
+    /// <param name="event">
+    ///     The event to format.
+    /// </param>
+    /// <returns>
+    ///     The formatted range, depending on <see cref="Event.End"/> and <see cref="Event.HasTime"/>:
+    ///     <list type="bullet">
+    ///         <item>
+    ///             <description>No end: <c>Donnerstag, 8. Oktober 2026, 19:30 Uhr</c></description>
+    ///         </item>
+    ///         <item>
+    ///             <description>Same day: <c>Donnerstag, 8. Oktober 2026, 19:30–21:00 Uhr</c></description>
+    ///         </item>
+    ///         <item>
+    ///             <description>Several days: <c>Freitag, 9. Oktober 2026 – 11. Oktober 2026</c></description>
+    ///         </item>
+    ///     </list>
+    ///     Without a time, the time parts are omitted.
+    /// </returns>
+    public static string Range(Event @event)
+        => (@event.Start, @event.End, @event.HasTime) switch
         {
-            return start;
-        }
+            (var start, null, var hasTime)
+                => Stamp(start, LongDate, hasTime),
+            (var start, { } end, true) when end.Date == start.Date
+                => $"{start.ToString(LongDate, Cultures.German)}, {start.ToString("HH:mm", Cultures.German)}–{end.ToString("HH:mm", Cultures.German)} Uhr",
+            (var start, { } end, false) when end.Date == start.Date
+                => Stamp(start, LongDate, withTime: false),
+            (var start, { } end, var hasTime)
+                => $"{Stamp(start, LongDate, hasTime)} – {Stamp(end, ShortDate, hasTime)}",
+        };
 
-        // Same day: append just the end time. Different days: append the full
-        // end date.
-        if (end.Date == ev.Start.Date)
-        {
-            return HasTime(ev)
-                ? start + "–" + end.ToString("HH:mm", German) + " Uhr"
-                : start;
-        }
-
-        var endText = HasTime(ev)
-            ? end.ToString("d. MMMM yyyy, HH:mm", German) + " Uhr"
-            : end.ToString("d. MMMM yyyy", German);
-        return start + " – " + endText;
-    }
+    /// <summary>
+    ///     Formats a single point in time as a date with an optional time.
+    /// </summary>
+    /// <param name="value">
+    ///     The date and time to format.
+    /// </param>
+    /// <param name="dateFormat">
+    ///     The date format, e.g. <see cref="LongDate"/>.
+    /// </param>
+    /// <param name="withTime">
+    ///     <see langword="true"/> to append the time, e.g. <c>, 19:30 Uhr</c>.
+    /// </param>
+    /// <returns>
+    ///     The formatted date, with the time if requested.
+    /// </returns>
+    private static string Stamp(DateTime value, string dateFormat, bool withTime)
+        => withTime
+            ? value.ToString(dateFormat + ", HH:mm", Cultures.German) + " Uhr"
+            : value.ToString(dateFormat, Cultures.German);
 }

Elternbeirat.Web/Shared/SourceUnavailable.cs

@@ -0,0 +1,30 @@
+namespace Elternbeirat.Web.Shared;
+
+/// <summary>
+///     Marks the current response as HTTP 503 when the content source is down.
+/// </summary>
+/// <remarks>
+///     Several components handle a <see cref="PocketBase.PocketBaseUnavailableException"/>
+///     the same way: the site works but PocketBase does not, so the response is a
+///     503 and the component renders a "temporarily unavailable" note instead of
+///     empty content that would read as 200 "there is nothing here". This puts the
+///     status-setting in one place so those components do not each repeat it.
+/// </remarks>
+internal static class SourceUnavailable
+{
+    /// <summary>
+    ///     Sets the response status to 503 Service Unavailable, if there is a
+    ///     response to set it on.
+    /// </summary>
+    /// <param name="context">
+    ///     The current HTTP context, or <see langword="null"/> when the component
+    ///     renders outside a request (in which case there is nothing to do).
+    /// </param>
+    public static void SetStatus(HttpContext? context)
+    {
+        if (context is not null)
+        {
+            context.Response.StatusCode = StatusCodes.Status503ServiceUnavailable;
+        }
+    }
+}

Elternbeirat.Web/_Imports.razor

@@ -1,3 +1,4 @@
+@using System.Globalization
 @using System.Net.Http
 @using System.Net.Http.Json
 @using Microsoft.AspNetCore.Components.Forms

docs/redaktion.md

@@ -87,8 +87,9 @@ sofort live, ohne Code und ohne Rebuild:
 5. Optional `location` (`header`/`footer`) **und** `order` setzen, damit die Seite
    ins Menü kommt; optional `embed` für eingebettete Blöcke (siehe unten).
 
-- **Slug bleibt englisch und ohne Umlaute.** `imprint`, `privacy`, `contact`,
-  `board`, `patrons`. Der `title` darf deutsch mit Umlauten sein (`Förderverein`).
+- **Slug bleibt englisch und ohne Umlaute** — `imprint`, `privacy`, `contact`,
+  `board`, `patrons`; erzwungen per Pattern (siehe *Slug-Regel wird erzwungen*
+  unten). Der `title` darf deutsch mit Umlauten sein (`Förderverein`).
 - **Reservierte Slugs.** `posts`, `events`, `faqs` und `/` (die Startseite `home`)
   gehören den festen Listen-/Sonderansichten. Eine `pages`-Seite mit einem dieser
   Slugs wird von der jeweiligen Ansicht verdeckt und **nicht** angezeigt; in der
@@ -105,6 +106,26 @@ sofort live, ohne Code und ohne Rebuild:
 > Diese Slugs nicht ändern — sonst laufen die rechtlich verlinkten Adressen ins
 > Leere (404).
 
+### Slug-Regel wird erzwungen
+
+Ein Slug muss ein sauberes URL-Segment sein: **Kleinbuchstaben, Ziffern und
+einzelne Bindestriche als Trenner, keine Umlaute** (`ueber-uns`, nicht `Über uns`).
+Das ist keine Bitte, sondern eine Feldregel: PocketBase weist einen Slug ab, der
+sie verletzt, und zeigt beim Speichern einen Fehler. Gibst du `Overview` ein,
+kommst du erst weiter, wenn du `overview` daraus machst. Die Website verlässt sich
+darauf — sie repariert einen Slug nicht mehr nachträglich.
+
+Die Regel steckt als **Pattern** am Feld `slug`. So ist sie gesetzt (einmalig,
+pro Collection mit einem Slug — `pages` **und** `posts`):
+
+1. Collection öffnen → *Edit collection* (oben rechts) → Feld `slug`.
+2. Am Feld auf das **Zahnrad** (Feldoptionen) → **Pattern**.
+3. Als Pattern eintragen: `^[a-z0-9]+(-[a-z0-9]+)*$`
+4. **Save** (Feld) und **Save** (Collection).
+
+Zum Prüfen: `board`, `ueber-uns`, `faq-lunch` werden angenommen; `Overview`,
+`über-uns`, `my page`, `-x` und `a--b` werden abgewiesen.
+
 ---
 
 ## Beiträge (`posts`)
@@ -113,8 +134,12 @@ Ein Beitrag hat `date`, `title`, `body`, `slug` und `public`. Er erscheint unter
 `/posts` (neueste zuerst) und unter `/posts/<slug>`; die neuesten werden auch auf
 der Startseite als Vorschau angeteasert.
 
-- `date` steuert Sortierung und angezeigtes Datum.
-- `slug` ist englisch, klein, ohne Umlaute (z. B. `new-sports-hall-opened`).
+- `date` steuert Sortierung und angezeigtes Datum. Anders als bei Terminen zählt
+  hier nur der **Tag** — eine Uhrzeit wird nie angezeigt, und die UTC-Verschiebung
+  aus dem Termine-Hinweis spielt keine Rolle. Trage einfach das Datum ein.
+- `slug` ist englisch, klein, ohne Umlaute (z. B. `new-sports-hall-opened`) —
+  dieselbe erzwungene Feldregel wie bei Seiten (siehe *Seiten → Slug-Regel wird
+  erzwungen*).
 
 ---
 
@@ -128,20 +153,26 @@ Die Übersicht `/events` trennt automatisch in kommende und vergangene Termine;
 die Reihenfolge der Records spielt keine Rolle. Besucher können `/events.ics` in
 ihrer Kalender-App abonnieren — der Feed entsteht aus denselben Records.
 
-> **Uhrzeit = Ortszeit.** Das Admin-Formular rechnet Datumsfelder in die
-> Browser-Zeitzone um und zeigt eine gespeicherte `19:30` je nach Sommer-/Winter-
-> zeit als 20:30/21:30 an. Das ist **kein** Fehler, nur zwei Bezugssysteme: der
-> gespeicherte Zahlenwert **ist** die Ortszeit (Europe/Berlin), die App zeigt ihn
-> unverändert. Trage die Uhrzeit ein, die auf der Seite stehen soll.
+> **Trage einfach die Ortszeit ein.** Gib die Uhrzeit ein, die auf der Seite
+> stehen soll (Europe/Berlin) — z. B. `08:00`. PocketBase speichert intern in UTC
+> und zeigt dir nach dem Speichern deshalb einen um 1–2 Stunden früheren Wert an
+> (aus `08:00` wird im Sommer `06:00`). Das ist **kein** Fehler: Die Website
+> rechnet beim Anzeigen automatisch nach Ortszeit zurück und zeigt wieder `08:00`,
+> Sommer- und Winterzeit inklusive. Du musst dich um UTC nicht kümmern.
 
 ---
 
 ## Häufige Fragen (`faqs`)
 
-Eine Frage hat `question`, `answer` (Markdown), `topic` (eines von
-`mensa`/`schliessfach`/`elterneuro`/`elternarbeit`) und `public`. Die App baut
-die FAQ-Seite generiert: sie gruppiert die Fragen nach `topic`. Der Rahmentext
-oben auf `/faqs` ist eine eigene Seite in `pages` (Slug `faqs`).
+Eine Frage hat `question`, `answer` (Markdown), `topic` und `public`. Die App
+baut die FAQ-Seite generiert: sie gruppiert die Fragen nach `topic` und zeigt den
+`topic`-Text unverändert als Gruppen-Überschrift. `topic` ist also **keine feste
+Auswahl**, sondern der Überschriftentext selbst (z. B. `Mensa und Mittagessen`) —
+eine neue Gruppe entsteht einfach, indem eine Frage einen neuen `topic`-Text
+bekommt; Fragen mit gleichem `topic` landen in derselben Gruppe. Auf Groß-/
+Kleinschreibung und Leerzeichen achten, sonst entstehen versehentlich zwei
+Gruppen. Der Rahmentext oben auf `/faqs` ist eine eigene Seite in `pages`
+(Slug `faqs`).
 
 ---
 

pb/pb_migrations/1727200000_dev_seed.js

@@ -27,7 +27,7 @@ migrate((app) => {
 ,
     events: [{"end":"","location":"Aula","note":"Gäste sind willkommen. Um Anmeldung im Sekretariat wird gebeten.","public":true,"start":"2026-10-08 19:30:00.000Z","title":"Elternbeiratssitzung"},{"end":"2026-10-20 18:30:00.000Z","location":"Klassenräume","note":"Terminvergabe über das Schulportal.","public":true,"start":"2026-10-20 16:00:00.000Z","title":"Elternsprechtag"},{"end":"2026-11-22 13:00:00.000Z","location":"Schulhof","note":"Kuchenspenden willkommen.","public":true,"start":"2026-11-22 09:00:00.000Z","title":"Herbstbasar"},{"end":"2027-01-06 00:00:00.000Z","location":"","note":"","public":true,"start":"2026-12-19 00:00:00.000Z","title":"Weihnachtsferien"},{"end":"","location":"Mensa","note":"Kennenlernen bei Butterbrezeln und Kaffee.","public":true,"start":"2026-09-10 18:00:00.000Z","title":"Willkommensabend der neuen Fünftklässler"}]
 ,
-    faqs: [{"answer":"Die Anmeldung läuft über das Bestellsystem der Schule. Die Zugangsdaten erhalten Sie zu Schuljahresbeginn über die Klassenleitung.","public":true,"question":"Wie melde ich mein Kind zum Mittagessen an?","topic":"mensa"},{"answer":"Ein Mittagessen kostet aktuell **4,20 €**. Für Familien mit Anspruch auf Leistungen nach dem Bildungs- und Teilhabepaket ist das Essen kostenfrei – sprechen Sie das Sekretariat an.","public":true,"question":"Was kostet ein Mittagessen?","topic":"mensa"},{"answer":"Ja, täglich steht mindestens ein vegetarisches Gericht zur Wahl.","public":true,"question":"Gibt es vegetarische Gerichte?","topic":"mensa"},{"answer":"Schließfächer werden über einen externen Anbieter gemietet. Das Anmeldeformular liegt bei den [Downloads](/downloads).","public":true,"question":"Wie bekommt mein Kind ein Schließfach?","topic":"schliessfach"},{"answer":"Die Miete beträgt rund 15 € pro Schuljahr zuzüglich einer Kaution, die bei Rückgabe erstattet wird.","public":true,"question":"Was kostet die Miete?","topic":"schliessfach"},{"answer":"Wenden Sie sich an den Anbieter; die Kontaktdaten stehen auf dem Mietvertrag. Bei Fragen hilft auch der [Elternbeirat](/contact).","public":true,"question":"Der Schlüssel ist verloren – was nun?","topic":"schliessfach"},{"answer":"Der Eltern-Euro ist ein **freiwilliger** Beitrag, mit dem kleinere Anschaffungen für die Klassen unkompliziert finanziert werden – etwa Bastelmaterial oder Ausflüge.","public":true,"question":"Was ist der Eltern-Euro?","topic":"elterneuro"},{"answer":"Nein. Der Beitrag ist ausdrücklich freiwillig, und niemand wird bei Nichtzahlung benachteiligt.","public":true,"question":"Ist der Beitrag verpflichtend?","topic":"elterneuro"},{"answer":"Ob Schulfest, Basar oder eine helfende Hand bei Ausflügen – über jede Unterstützung freuen wir uns. Melden Sie sich einfach über die [Kontaktseite](/contact).","public":true,"question":"Wie kann ich mich engagieren?","topic":"elternarbeit"},{"answer":"Nein. Viele Aufgaben erledigen Eltern, die einfach mithelfen möchten, ganz ohne Amt.","public":true,"question":"Muss ich in den Elternbeirat gewählt sein, um zu helfen?","topic":"elternarbeit"}]
+    faqs: [{"answer":"Die Anmeldung läuft über das Bestellsystem der Schule. Die Zugangsdaten erhalten Sie zu Schuljahresbeginn über die Klassenleitung.","public":true,"question":"Wie melde ich mein Kind zum Mittagessen an?","topic":"Mensa und Mittagessen"},{"answer":"Ein Mittagessen kostet aktuell **4,20 €**. Für Familien mit Anspruch auf Leistungen nach dem Bildungs- und Teilhabepaket ist das Essen kostenfrei – sprechen Sie das Sekretariat an.","public":true,"question":"Was kostet ein Mittagessen?","topic":"Mensa und Mittagessen"},{"answer":"Ja, täglich steht mindestens ein vegetarisches Gericht zur Wahl.","public":true,"question":"Gibt es vegetarische Gerichte?","topic":"Mensa und Mittagessen"},{"answer":"Schließfächer werden über einen externen Anbieter gemietet. Das Anmeldeformular liegt bei den [Downloads](/downloads).","public":true,"question":"Wie bekommt mein Kind ein Schließfach?","topic":"Schließfächer"},{"answer":"Die Miete beträgt rund 15 € pro Schuljahr zuzüglich einer Kaution, die bei Rückgabe erstattet wird.","public":true,"question":"Was kostet die Miete?","topic":"Schließfächer"},{"answer":"Wenden Sie sich an den Anbieter; die Kontaktdaten stehen auf dem Mietvertrag. Bei Fragen hilft auch der [Elternbeirat](/contact).","public":true,"question":"Der Schlüssel ist verloren – was nun?","topic":"Schließfächer"},{"answer":"Der Eltern-Euro ist ein **freiwilliger** Beitrag, mit dem kleinere Anschaffungen für die Klassen unkompliziert finanziert werden – etwa Bastelmaterial oder Ausflüge.","public":true,"question":"Was ist der Eltern-Euro?","topic":"Eltern-Euro"},{"answer":"Nein. Der Beitrag ist ausdrücklich freiwillig, und niemand wird bei Nichtzahlung benachteiligt.","public":true,"question":"Ist der Beitrag verpflichtend?","topic":"Eltern-Euro"},{"answer":"Ob Schulfest, Basar oder eine helfende Hand bei Ausflügen – über jede Unterstützung freuen wir uns. Melden Sie sich einfach über die [Kontaktseite](/contact).","public":true,"question":"Wie kann ich mich engagieren?","topic":"Elternarbeit und Mitmachen"},{"answer":"Nein. Viele Aufgaben erledigen Eltern, die einfach mithelfen möchten, ganz ohne Amt.","public":true,"question":"Muss ich in den Elternbeirat gewählt sein, um zu helfen?","topic":"Elternarbeit und Mitmachen"}]
 ,
   }
 

pb/pb_migrations/collections_schema.json

@@ -74,7 +74,7 @@
         "max": 0,
         "min": 0,
         "name": "slug",
-        "pattern": "",
+        "pattern": "^[a-z0-9]+(-[a-z0-9]+)*$",
         "presentable": false,
         "primaryKey": false,
         "required": true,
@@ -298,7 +298,7 @@
         "max": 0,
         "min": 0,
         "name": "slug",
-        "pattern": "",
+        "pattern": "^[a-z0-9]+(-[a-z0-9]+)*$",
         "presentable": false,
         "primaryKey": false,
         "required": true,
@@ -388,26 +388,24 @@
         "pattern": "",
         "presentable": false,
         "primaryKey": false,
-        "required": false,
+        "required": true,
         "system": false,
         "type": "text"
       },
       {
+        "autogeneratePattern": "",
         "help": "",
         "hidden": false,
         "id": "select2638274075",
-        "maxSelect": 1,
+        "max": 0,
+        "min": 0,
         "name": "topic",
+        "pattern": "",
         "presentable": false,
-        "required": false,
+        "primaryKey": false,
+        "required": true,
         "system": false,
-        "type": "select",
-        "values": [
-          "mensa",
-          "schliessfach",
-          "elterneuro",
-          "elternarbeit"
-        ]
+        "type": "text"
       },
       {
         "help": "",