Favoriten überarbeitet

.gitignore

@@ -1,8 +1,6 @@
-<<<<<<< HEAD
+.codex-temp/
 php-server.log
 php-server.err.log
 php-server-error.log
-=======
+__pycache__/
-.codex-temp/
+*.pyc
-php-server-error.log
->>>>>>> fc3264cc2fa76249c40e422de2381eb7c6920c28

docs/README.md

@@ -10,6 +10,8 @@ Hier liegen die internen Anleitungen und technischen Hilfen für das Projekt.
   Lokale Startanleitung für den PHP-Webserver auf den bekannten Arbeitsplätzen
 - [`docs/README_RECHTESYSTEM.md`](README_RECHTESYSTEM.md)
   Beschreibung des aktuellen Rollen- und Seitenrechtesystems
+- [`docs/README_DATENBANKABFRAGEN.md`](README_DATENBANKABFRAGEN.md)
+  Kurzanleitung fuer lokale Datenbankabfragen mit der vorhandenen Projektkonfiguration
 
 ## Hinweis
 

docs/README_DATENBANKABFRAGEN.md

@@ -0,0 +1,83 @@
+# Datenbankabfragen
+
+Diese Notiz beschreibt, wie in diesem Projekt lokale Datenbankabfragen ausgefuehrt werden koennen.
+
+## Zugangsdaten
+
+Die Verbindungsdaten liegen in:
+
+- `config/database.php`
+
+Dort stehen `host`, `dbname`, `user`, `pass` und `charset`.
+
+## Empfohlener Weg
+
+Am einfachsten ist eine kurze PHP-Datei oder ein kurzes PHP-Skript, das die vorhandene Projektkonfiguration verwendet.
+
+Beispiel:
+
+```php
+<?php
+declare(strict_types=1);
+
+$config = require __DIR__ . '/../config/database.php';
+
+$dsn = sprintf(
+    'mysql:host=%s;dbname=%s;charset=%s',
+    $config['host'],
+    $config['dbname'],
+    $config['charset'] ?? 'utf8mb4'
+);
+
+$pdo = new PDO(
+    $dsn,
+    $config['user'],
+    $config['pass'],
+    [
+        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    ]
+);
+
+$stmt = $pdo->query("SELECT id, mp_number, designation_text FROM minorplanets_mpc WHERE mp_number = 1 LIMIT 1");
+$row = $stmt->fetch();
+
+echo json_encode($row, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+```
+
+## Ausfuehrung
+
+Wenn `php` nicht im Systempfad liegt, kann die lokale `php.exe` direkt verwendet werden.
+
+Beispiel von diesem Rechner:
+
+```powershell
+C:\laragon\bin\php\php-8.4.5-nts-Win32-vs17-x64\php.exe .codex-temp\check_defaults.php
+```
+
+## Praktische Beispielabfragen
+
+`Ceres` pruefen:
+
+```sql
+SELECT id, mp_number, designation_text, desig_packed
+FROM minorplanets_mpc
+WHERE mp_number = 1
+LIMIT 1;
+```
+
+`Halley` pruefen:
+
+```sql
+SELECT id, designation_and_name, orbit_type
+FROM comets_mpc
+WHERE designation_and_name LIKE '%Halley%'
+ORDER BY designation_and_name ASC, id ASC
+LIMIT 10;
+```
+
+## Hinweise
+
+- Temporaere Pruefskripte am besten in `.codex-temp/` anlegen und danach wieder loeschen.
+- Fuer Projektcode immer die vorhandene `config/database.php` verwenden und keine Zugangsdaten hart in Dateien eintragen.
+- Wenn nur geprueft werden soll, reichen `SELECT`-Abfragen ohne schreibende Operationen.

public/my_favorites.php

@@ -358,18 +358,26 @@ function renderTrackedMinorplanetsSection(array $trackedMinorplanets, bool $oob
                             <td class="<?= (int) $minorplanet['is_favorite'] === 1 ? 'favorite-text' : '' ?>"><?= h($minorplanet['mp_number'] !== null ? (string) $minorplanet['mp_number'] : '-') ?></td>
                             <td class="<?= (int) $minorplanet['is_favorite'] === 1 ? 'favorite-text' : '' ?>"><?= (int) $minorplanet['is_favorite'] === 1 ? '*' : '-' ?></td>
                             <td class="action-cell">
-                                <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplaneten-Favorit wird aktualisiert..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML">
+                                <?php if (count($trackedMinorplanets) <= 1 && (int) $minorplanet['is_favorite'] === 1): ?>
-                                    <input type="hidden" name="action" value="toggle_minorplanet_favorite">
+                                    <span class="hint">Favorit bleibt gesetzt</span>
-                                    <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
+                                <?php else: ?>
-                                    <button type="submit" class="btn btn-sm btn-secondary<?= (int) $minorplanet['is_favorite'] === 1 ? ' favorite-active' : '' ?>">
+                                    <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplaneten-Favorit wird aktualisiert..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML">
-                                        <?= (int) $minorplanet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
+                                        <input type="hidden" name="action" value="toggle_minorplanet_favorite">
-                                    </button>
+                                        <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
-                                </form>
+                                        <button type="submit" class="btn btn-sm btn-secondary<?= (int) $minorplanet['is_favorite'] === 1 ? ' favorite-active' : '' ?>">
-                                <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplanet wird entfernt..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML" onsubmit="return confirm('Kleinplanet wirklich entfernen?');">
+                                            <?= (int) $minorplanet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
-                                    <input type="hidden" name="action" value="remove_minorplanet">
+                                        </button>
-                                    <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
+                                    </form>
-                                    <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
+                                <?php endif; ?>
-                                </form>
+                                <?php if (count($trackedMinorplanets) > 1): ?>
+                                    <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplanet wird entfernt..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML" onsubmit="return confirm('Kleinplanet wirklich entfernen?');">
+                                        <input type="hidden" name="action" value="remove_minorplanet">
+                                        <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
+                                        <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
+                                    </form>
+                                <?php else: ?>
+                                    <span class="hint">Letzter Kleinplanet</span>
+                                <?php endif; ?>
                             </td>
                         </tr>
                     <?php endforeach; ?>
@@ -470,18 +478,26 @@ function renderTrackedCometsSection(array $trackedComets, bool $oob = false): st
                             <td class="<?= (int) $comet['is_favorite'] === 1 ? 'favorite-text' : '' ?>"><?= h((string) $comet['orbit_type']) ?></td>
                             <td class="<?= (int) $comet['is_favorite'] === 1 ? 'favorite-text' : '' ?>"><?= (int) $comet['is_favorite'] === 1 ? '*' : '-' ?></td>
                             <td class="action-cell">
-                                <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kometen-Favorit wird aktualisiert..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML">
+                                <?php if (count($trackedComets) <= 1 && (int) $comet['is_favorite'] === 1): ?>
-                                    <input type="hidden" name="action" value="toggle_comet_favorite">
+                                    <span class="hint">Favorit bleibt gesetzt</span>
-                                    <input type="hidden" name="comet_id" value="<?= (int) $comet['id'] ?>">
+                                <?php else: ?>
-                                    <button type="submit" class="btn btn-sm btn-secondary<?= (int) $comet['is_favorite'] === 1 ? ' favorite-active' : '' ?>">
+                                    <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kometen-Favorit wird aktualisiert..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML">
-                                        <?= (int) $comet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
+                                        <input type="hidden" name="action" value="toggle_comet_favorite">
-                                    </button>
+                                        <input type="hidden" name="comet_id" value="<?= (int) $comet['id'] ?>">
-                                </form>
+                                        <button type="submit" class="btn btn-sm btn-secondary<?= (int) $comet['is_favorite'] === 1 ? ' favorite-active' : '' ?>">
-                                <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Komet wird entfernt..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML" onsubmit="return confirm('Komet wirklich entfernen?');">
+                                            <?= (int) $comet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
-                                    <input type="hidden" name="action" value="remove_comet">
+                                        </button>
-                                    <input type="hidden" name="comet_id" value="<?= (int) $comet['id'] ?>">
+                                    </form>
-                                    <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
+                                <?php endif; ?>
-                                </form>
+                                <?php if (count($trackedComets) > 1): ?>
+                                    <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Komet wird entfernt..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML" onsubmit="return confirm('Komet wirklich entfernen?');">
+                                        <input type="hidden" name="action" value="remove_comet">
+                                        <input type="hidden" name="comet_id" value="<?= (int) $comet['id'] ?>">
+                                        <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
+                                    </form>
+                                <?php else: ?>
+                                    <span class="hint">Letzter Komet</span>
+                                <?php endif; ?>
                             </td>
                         </tr>
                     <?php endforeach; ?>
@@ -566,6 +582,35 @@ function setExclusiveFavorite(PDO $pdo, string $tableName, string $idColumn, int
             ':entity_id' => $entityId,
         ]);
 
+        if ($newValue === 0) {
+            $stmtNextFavorite = $pdo->prepare("
+                SELECT `{$idColumn}`
+                FROM `{$tableName}`
+                WHERE `user_id` = :user_id
+                  AND `{$idColumn}` <> :entity_id
+                ORDER BY `created_at` ASC, `{$idColumn}` ASC
+                LIMIT 1
+            ");
+            $stmtNextFavorite->execute([
+                ':user_id' => $userId,
+                ':entity_id' => $entityId,
+            ]);
+            $nextEntityId = $stmtNextFavorite->fetchColumn();
+
+            if ($nextEntityId !== false) {
+                $stmtPromote = $pdo->prepare("
+                    UPDATE `{$tableName}`
+                    SET `is_favorite` = 1
+                    WHERE `user_id` = :user_id
+                      AND `{$idColumn}` = :entity_id
+                ");
+                $stmtPromote->execute([
+                    ':user_id' => $userId,
+                    ':entity_id' => (int) $nextEntityId,
+                ]);
+            }
+        }
+
         $pdo->commit();
         return true;
     } catch (Throwable $e) {
@@ -590,6 +635,51 @@ function countUserRows(PDO $pdo, string $tableName, int $userId): int
     return (int) $stmtCount->fetchColumn();
 }
 
+function ensureFavoriteIfNeeded(PDO $pdo, string $tableName, string $idColumn, int $userId): void
+{
+    $stmtFavoriteCount = $pdo->prepare("
+        SELECT COUNT(*)
+        FROM `{$tableName}`
+        WHERE `user_id` = :user_id
+          AND `is_favorite` = 1
+    ");
+    $stmtFavoriteCount->execute([
+        ':user_id' => $userId,
+    ]);
+    $favoriteCount = (int) $stmtFavoriteCount->fetchColumn();
+
+    if ($favoriteCount > 0) {
+        return;
+    }
+
+    $stmtNextFavorite = $pdo->prepare("
+        SELECT `{$idColumn}`
+        FROM `{$tableName}`
+        WHERE `user_id` = :user_id
+        ORDER BY `created_at` ASC, `{$idColumn}` ASC
+        LIMIT 1
+    ");
+    $stmtNextFavorite->execute([
+        ':user_id' => $userId,
+    ]);
+    $nextEntityId = $stmtNextFavorite->fetchColumn();
+
+    if ($nextEntityId === false) {
+        return;
+    }
+
+    $stmtPromote = $pdo->prepare("
+        UPDATE `{$tableName}`
+        SET `is_favorite` = 1
+        WHERE `user_id` = :user_id
+          AND `{$idColumn}` = :entity_id
+    ");
+    $stmtPromote->execute([
+        ':user_id' => $userId,
+        ':entity_id' => (int) $nextEntityId,
+    ]);
+}
+
 function validateLocationForm(array $input, array &$errors): array
 {
     $name = trim((string) ($input['name'] ?? ''));
@@ -879,6 +969,13 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $errors[] = 'Ungültiger Kleinplanet.';
         }
 
+        if (empty($errors)) {
+            $minorplanetCount = countUserRows($pdo, 'app_user_minorplanets', $userId);
+            if ($minorplanetCount <= 1) {
+                $errors[] = 'Der letzte Kleinplanet kann nicht gelöscht werden.';
+            }
+        }
+
         if (empty($errors)) {
             $stmtDelete = $pdo->prepare("
                 DELETE FROM `app_user_minorplanets`
@@ -901,6 +998,32 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $errors[] = 'Ungültiger Kleinplanet.';
         }
 
+        if (empty($errors)) {
+            $stmtCurrentMinorplanet = $pdo->prepare("
+                SELECT `is_favorite`
+                FROM `app_user_minorplanets`
+                WHERE `user_id` = :user_id
+                  AND `minorplanet_id` = :minorplanet_id
+                LIMIT 1
+            ");
+            $stmtCurrentMinorplanet->execute([
+                ':user_id' => $userId,
+                ':minorplanet_id' => $minorplanetId,
+            ]);
+            $currentMinorplanetFavorite = $stmtCurrentMinorplanet->fetchColumn();
+
+            if ($currentMinorplanetFavorite === false) {
+                $errors[] = 'Der Kleinplanet ist nicht in deiner Liste vorhanden.';
+            }
+        }
+
+        if (empty($errors)) {
+            $minorplanetCount = countUserRows($pdo, 'app_user_minorplanets', $userId);
+            if ($minorplanetCount <= 1 && (int) $currentMinorplanetFavorite === 1) {
+                $errors[] = 'Beim letzten Kleinplaneten kann der Favorit nicht entfernt werden.';
+            }
+        }
+
         if (empty($errors)) {
             if (!setExclusiveFavorite($pdo, 'app_user_minorplanets', 'minorplanet_id', $userId, $minorplanetId)) {
                 $errors[] = 'Der Kleinplanet ist nicht in deiner Liste vorhanden.';
@@ -965,6 +1088,13 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $errors[] = 'Ungueltiger Komet.';
         }
 
+        if (empty($errors)) {
+            $cometCount = countUserRows($pdo, 'app_user_comets', $userId);
+            if ($cometCount <= 1) {
+                $errors[] = 'Der letzte Komet kann nicht gelöscht werden.';
+            }
+        }
+
         if (empty($errors)) {
             $stmtDelete = $pdo->prepare("
                 DELETE FROM `app_user_comets`
@@ -987,6 +1117,32 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $errors[] = 'Ungueltiger Komet.';
         }
 
+        if (empty($errors)) {
+            $stmtCurrentComet = $pdo->prepare("
+                SELECT `is_favorite`
+                FROM `app_user_comets`
+                WHERE `user_id` = :user_id
+                  AND `comet_id` = :comet_id
+                LIMIT 1
+            ");
+            $stmtCurrentComet->execute([
+                ':user_id' => $userId,
+                ':comet_id' => $cometId,
+            ]);
+            $currentCometFavorite = $stmtCurrentComet->fetchColumn();
+
+            if ($currentCometFavorite === false) {
+                $errors[] = 'Der Komet ist nicht in deiner Liste vorhanden.';
+            }
+        }
+
+        if (empty($errors)) {
+            $cometCount = countUserRows($pdo, 'app_user_comets', $userId);
+            if ($cometCount <= 1 && (int) $currentCometFavorite === 1) {
+                $errors[] = 'Beim letzten Kometen kann der Favorit nicht entfernt werden.';
+            }
+        }
+
         if (empty($errors)) {
             if (!setExclusiveFavorite($pdo, 'app_user_comets', 'comet_id', $userId, $cometId)) {
                 $errors[] = 'Der Komet ist nicht in deiner Liste vorhanden.';
@@ -1329,6 +1485,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     }
 }
 
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    ensureFavoriteIfNeeded($pdo, 'app_user_minorplanets', 'minorplanet_id', $userId);
+    ensureFavoriteIfNeeded($pdo, 'app_user_comets', 'comet_id', $userId);
+}
+
 $stmtLocations = $pdo->prepare("
     SELECT
         `id`,
@@ -1987,18 +2148,26 @@ $loggedIn = true;
                             <td class="<?= (int) $minorplanet['is_favorite'] === 1 ? 'favorite-text' : '' ?>"><?= h($minorplanet['mp_number'] !== null ? (string) $minorplanet['mp_number'] : '-') ?></td>
                             <td class="<?= (int) $minorplanet['is_favorite'] === 1 ? 'favorite-text' : '' ?>"><?= (int) $minorplanet['is_favorite'] === 1 ? '*' : '-' ?></td>
                             <td class="action-cell">
-                                <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplaneten-Favorit wird aktualisiert..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML">
+                                <?php if (count($trackedMinorplanets) <= 1 && (int) $minorplanet['is_favorite'] === 1): ?>
-                                    <input type="hidden" name="action" value="toggle_minorplanet_favorite">
+                                    <span class="hint">Favorit bleibt gesetzt</span>
-                                    <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
+                                <?php else: ?>
-                                    <button type="submit" class="btn btn-sm btn-secondary<?= (int) $minorplanet['is_favorite'] === 1 ? ' favorite-active' : '' ?>">
+                                    <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplaneten-Favorit wird aktualisiert..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML">
-                                        <?= (int) $minorplanet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
+                                        <input type="hidden" name="action" value="toggle_minorplanet_favorite">
-                                    </button>
+                                        <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
-                                </form>
+                                        <button type="submit" class="btn btn-sm btn-secondary<?= (int) $minorplanet['is_favorite'] === 1 ? ' favorite-active' : '' ?>">
-                                <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplanet wird entfernt..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML" onsubmit="return confirm('Kleinplanet wirklich entfernen?');">
+                                            <?= (int) $minorplanet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
-                                    <input type="hidden" name="action" value="remove_minorplanet">
+                                        </button>
-                                    <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
+                                    </form>
-                                    <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
+                                <?php endif; ?>
-                                </form>
+                                <?php if (count($trackedMinorplanets) > 1): ?>
+                                    <form method="post" action="" class="favorites-loading-form favorites-loading-form-htmx" data-loading-message="Kleinplanet wird entfernt..." hx-post="my_favorites.php" hx-target="#favorites-messages" hx-swap="outerHTML" onsubmit="return confirm('Kleinplanet wirklich entfernen?');">
+                                        <input type="hidden" name="action" value="remove_minorplanet">
+                                        <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
+                                        <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
+                                    </form>
+                                <?php else: ?>
+                                    <span class="hint">Letzter Kleinplanet</span>
+                                <?php endif; ?>
                             </td>
                         </tr>
                     <?php endforeach; ?>

public/register.php

@@ -33,6 +33,8 @@ const DEFAULT_LOCATION_LONGITUDE = 11.189;
 const DEFAULT_LOCATION_ELEVATION = 640.0;
 const DEFAULT_LOCATION_TIMEZONE = 'Europe/Berlin';
 const DEFAULT_SATELLITE_ID = 61;
+const DEFAULT_MINORPLANET_NUMBER = 1;
+const DEFAULT_COMET_SEARCH = 'Halley';
 
 function sendRegistrationNotification(string $username, string $email, ?string $displayName): void
 {
@@ -77,6 +79,39 @@ function textLength(string $value): int
     return strlen($value);
 }
 
+function findDefaultMinorplanetId(PDO $pdo): ?int
+{
+    $stmt = $pdo->prepare("
+        SELECT `id`
+        FROM `minorplanets_mpc`
+        WHERE `mp_number` = :mp_number
+        LIMIT 1
+    ");
+    $stmt->execute([
+        ':mp_number' => DEFAULT_MINORPLANET_NUMBER,
+    ]);
+    $id = $stmt->fetchColumn();
+
+    return $id !== false ? (int) $id : null;
+}
+
+function findDefaultCometId(PDO $pdo): ?int
+{
+    $stmt = $pdo->prepare("
+        SELECT `id`
+        FROM `comets_mpc`
+        WHERE `designation_and_name` LIKE :search
+        ORDER BY `designation_and_name` ASC, `id` ASC
+        LIMIT 1
+    ");
+    $stmt->execute([
+        ':search' => '%' . DEFAULT_COMET_SEARCH . '%',
+    ]);
+    $id = $stmt->fetchColumn();
+
+    return $id !== false ? (int) $id : null;
+}
+
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     $username       = trim($_POST['username'] ?? '');
     $email          = trim($_POST['email'] ?? '');
@@ -131,6 +166,19 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
     if (empty($errors)) {
         $passwordHash = password_hash($password, PASSWORD_DEFAULT);
+        $defaultMinorplanetId = findDefaultMinorplanetId($pdo);
+        $defaultCometId = findDefaultCometId($pdo);
+
+        if ($defaultMinorplanetId === null) {
+            $errors[] = 'Der Standard-Kleinplanet Ceres wurde in der Datenbank nicht gefunden.';
+        }
+
+        if ($defaultCometId === null) {
+            $errors[] = 'Der Standard-Komet Halley wurde in der Datenbank nicht gefunden.';
+        }
+    }
+
+    if (empty($errors)) {
         $pdo->beginTransaction();
 
         try {
@@ -215,6 +263,42 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 ':satellite_id' => DEFAULT_SATELLITE_ID,
             ]);
 
+            $stmtInsertMinorplanet = $pdo->prepare("
+                INSERT INTO `app_user_minorplanets` (
+                    `user_id`,
+                    `minorplanet_id`,
+                    `is_favorite`,
+                    `created_at`
+                ) VALUES (
+                    :user_id,
+                    :minorplanet_id,
+                    1,
+                    NOW()
+                )
+            ");
+            $stmtInsertMinorplanet->execute([
+                ':user_id' => $userId,
+                ':minorplanet_id' => $defaultMinorplanetId,
+            ]);
+
+            $stmtInsertComet = $pdo->prepare("
+                INSERT INTO `app_user_comets` (
+                    `user_id`,
+                    `comet_id`,
+                    `is_favorite`,
+                    `created_at`
+                ) VALUES (
+                    :user_id,
+                    :comet_id,
+                    1,
+                    NOW()
+                )
+            ");
+            $stmtInsertComet->execute([
+                ':user_id' => $userId,
+                ':comet_id' => $defaultCometId,
+            ]);
+
             $pdo->commit();
         } catch (Throwable $e) {
             if ($pdo->inTransaction()) {