diff --git a/src/Command/PrewarmCommand.php b/src/Command/PrewarmCommand.php
index bc54a37..9dc6074 100644
--- a/src/Command/PrewarmCommand.php
+++ b/src/Command/PrewarmCommand.php
@@ -9,6 +9,7 @@ use App\Repository\ArticleRepository;
 use App\Service\ArticleCommentThreadLoader;
 use App\Service\CacheService;
 use App\Service\MagazineRefresher;
+use App\Service\Nip09DeletionApplier;
 use App\Service\NostrClient;
 use Psr\Log\LoggerInterface;
 use swentel\nostr\Key\Key;
@@ -26,12 +27,13 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
  */
 #[AsCommand(
     name: 'app:prewarm',
-    description: 'Refresh magazine indices, profile metadata cache, and comment thread caches (use --no-comments to skip comments)',
+    description: 'Refresh magazine indices, NIP-09 deletions, profile metadata, and comment caches',
 )]
 final class PrewarmCommand extends Command
 {
     public function __construct(
         private readonly MagazineRefresher $magazineRefresher,
+        private readonly Nip09DeletionApplier $nip09DeletionApplier,
         private readonly CacheService $cacheService,
         private readonly NostrClient $nostrClient,
         private readonly ArticleRepository $articleRepository,
@@ -46,6 +48,8 @@ final class PrewarmCommand extends Command
     {
         $this
             ->addOption('no-magazine', null, InputOption::VALUE_NONE, 'Skip magazine 30040 index fetch')
+            ->addOption('no-deletions', null, InputOption::VALUE_NONE, 'Skip NIP-09 kind 5 deletion sync (30023/30024 DB + 30040 magazine cache)')
+            ->addOption('deletion-since', null, InputOption::VALUE_REQUIRED, 'strtotime() window start for kind 5 fetch', '-2 month')
             ->addOption('no-metadata', null, InputOption::VALUE_NONE, 'Skip Nostr profile metadata cache')
             ->addOption('no-comments', null, InputOption::VALUE_NONE, 'Skip comment thread cache')
             ->addOption('magazine-budget', null, InputOption::VALUE_REQUIRED, 'Seconds wall time for magazine relay refresh', '30')
@@ -79,6 +83,59 @@ final class PrewarmCommand extends Command
         // MagazineRefresher sets max_execution_time (e.g. 60 for budget 30); restore before metadata.
         $this->disableCliExecutionTimeLimit();
 
+        if (!$input->getOption('no-deletions')) {
+            $io->section('NIP-09 deletions (kind 5 → 30023/30024 / 30040)');
+            $sinceStr = (string) $input->getOption('deletion-since');
+            $since = strtotime($sinceStr);
+            if ($since === false) {
+                $since = strtotime('-2 month');
+            }
+            $until = time();
+            $deletionPubkeys = [];
+            foreach ($this->articleRepository->findDistinctAuthorPubkeys() as $pk) {
+                if (\is_string($pk) && 64 === \strlen($pk)) {
+                    $deletionPubkeys[] = $pk;
+                }
+            }
+            $npubParam = (string) $this->params->get('npub');
+            if (str_starts_with($npubParam, 'npub')) {
+                try {
+                    $sitePk = $keys->convertToHex($npubParam);
+                    if ($sitePk !== '' && 64 === \strlen($sitePk) && !\in_array($sitePk, $deletionPubkeys, true)) {
+                        $deletionPubkeys[] = $sitePk;
+                    }
+                } catch (\Throwable) {
+                }
+            }
+            if ($deletionPubkeys === []) {
+                $io->note('No author pubkeys; skipping kind 5 deletion fetch.');
+            } else {
+                try {
+                    $kind5 = $this->nostrClient->fetchKind5DeletionEventsForAuthors(
+                        $deletionPubkeys,
+                        $since,
+                        $until,
+                        40
+                    );
+                    $st = $this->nip09DeletionApplier->apply($kind5);
+                    $io->writeln(sprintf(
+                        'Kind 5 events: <info>%d</info> (deduped). Articles removed: <info>%d</info>; magazine root/category cache entries removed: <info>%d</info> / <info>%d</info>.',
+                        \count($kind5),
+                        $st['articles_removed'],
+                        $st['magazine_roots'],
+                        $st['magazine_categories']
+                    ));
+                } catch (\Throwable $e) {
+                    $this->logger->error('app:prewarm NIP-09 failed', ['exception' => $e]);
+                    $io->warning('NIP-09 step failed: '.$e->getMessage());
+                }
+            }
+        } else {
+            $io->note('Skipping NIP-09 deletions (--no-deletions).');
+        }
+
+        $this->disableCliExecutionTimeLimit();
+
         if (!$input->getOption('no-metadata')) {
             $io->section('Author metadata (cache)');
             $pubkeys = $this->articleRepository->findDistinctAuthorPubkeys();
diff --git a/src/Enum/KindsEnum.php b/src/Enum/KindsEnum.php
index 714f1fd..95f7295 100644
--- a/src/Enum/KindsEnum.php
+++ b/src/Enum/KindsEnum.php
@@ -5,6 +5,7 @@ namespace App\Enum;
 enum KindsEnum: int
 {
     case METADATA = 0; // metadata, NIP-01
+    case DELETION_REQUEST = 5; // NIP-09
     case TEXT_NOTE = 1; // text note, NIP-01, will not implement
     case FOLLOWS = 3;
     case REPOST = 6; // Only wraps kind 1, NIP-18, will not implement
diff --git a/src/Repository/ArticleRepository.php b/src/Repository/ArticleRepository.php
index 901ae83..bad8686 100644
--- a/src/Repository/ArticleRepository.php
+++ b/src/Repository/ArticleRepository.php
@@ -125,6 +125,11 @@ class ArticleRepository extends ServiceEntityRepository
             ->getSingleColumnResult();
     }
 
+    public function findOneByEventId(string $eventId): ?Article
+    {
+        return $this->findOneBy(['eventId' => $eventId]);
+    }
+
     /**
      * Find articles by author's public key
      */
diff --git a/src/Service/MagazineIndexStore.php b/src/Service/MagazineIndexStore.php
index 8c6d1ed..755df7c 100644
--- a/src/Service/MagazineIndexStore.php
+++ b/src/Service/MagazineIndexStore.php
@@ -73,6 +73,29 @@ final class MagazineIndexStore
         $this->pool->save($item);
     }
 
+    /**
+     * Remove a cached category index (NIP-09 / local invalidation).
+     *
+     * @throws InvalidArgumentException
+     */
+    public function deleteCategory(string $slug): void
+    {
+        if ($slug === '') {
+            return;
+        }
+        $this->pool->deleteItem(self::CAT_PREFIX.$slug);
+    }
+
+    /**
+     * Remove the cached root magazine index for this npub + d_tag.
+     *
+     * @throws InvalidArgumentException
+     */
+    public function deleteRoot(string $npub, string $dTag): void
+    {
+        $this->pool->deleteItem($this->rootKey($npub, $dTag));
+    }
+
     private function rootKey(string $npub, string $dTag): string
     {
         return self::ROOT_PREFIX.hash('sha256', $npub."\0".$dTag);
diff --git a/src/Service/Nip09DeletionApplier.php b/src/Service/Nip09DeletionApplier.php
new file mode 100644
index 0000000..49c5378
--- /dev/null
+++ b/src/Service/Nip09DeletionApplier.php
@@ -0,0 +1,359 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\Entity\Event as MagazineNostrEvent;
+use App\Enum\KindsEnum;
+use App\Repository\ArticleRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Psr\Log\LoggerInterface;
+use swentel\nostr\Key\Key;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
+
+/**
+ * Applies NIP-09 (kind 5) deletion requests to local MySQL articles and magazine 30040 cache.
+ *
+ * Relays are not authoritative; we only remove data we can validate (same pubkey as deletion request).
+ * For cached 30040 category indices (keyed by `d` only), we require the stored event’s author
+ * to match the deletion — not just an `a` tag whose own pubkey matches, so colliding `d` values
+ * across authors cannot wipe another author’s cache entry.
+ */
+final class Nip09DeletionApplier
+{
+    public function __construct(
+        private readonly EntityManagerInterface $entityManager,
+        private readonly ArticleRepository $articleRepository,
+        private readonly MagazineIndexStore $magazineIndexStore,
+        private readonly ParameterBagInterface $params,
+        private readonly LoggerInterface $logger,
+    ) {
+    }
+
+    /**
+     * @param list<object> $deletionEvents Kind-5 events from relays (e.g. {@see NostrClient::fetchKind5DeletionEventsForAuthors})
+     *
+     * @return array{articles_removed: int, magazine_roots: int, magazine_categories: int}
+     */
+    public function apply(array $deletionEvents): array
+    {
+        $articlesRemoved = 0;
+        $articlesPendingFlush = 0;
+        $roots = 0;
+        $cats = 0;
+        $seenArticleIds = [];
+
+        foreach ($deletionEvents as $ev) {
+            if (!\is_object($ev)) {
+                continue;
+            }
+            if ((int) ($ev->kind ?? 0) !== KindsEnum::DELETION_REQUEST->value) {
+                continue;
+            }
+            $deletionPubkey = (string) ($ev->pubkey ?? '');
+            if (64 !== \strlen($deletionPubkey)) {
+                continue;
+            }
+
+            [$eIds, $eKinds] = $this->parseETags($ev);
+            $aAddrs = $this->parseATags($ev);
+
+            foreach ($eIds as $i => $eId) {
+                if (64 !== \strlen($eId)) {
+                    continue;
+                }
+                $declared = $eKinds[$i] ?? null;
+                if ($declared !== null
+                    && !\in_array($declared, [30023, 30024, 30040, 1], true)) {
+                    // Other kinds: we do not mirror in this app; skip.
+                    continue;
+                }
+                if ($declared === 1) {
+                    continue;
+                }
+                if ($this->removeArticleByEventIdIfValid($eId, $deletionPubkey, $declared, $seenArticleIds)) {
+                    ++$articlesRemoved;
+                    ++$articlesPendingFlush;
+                    continue;
+                }
+                // No article row: 30040 index (or mis-tagged kind); only skip unrelated kinds.
+                if ($declared === null || \in_array($declared, [30023, 30024, 30040], true)) {
+                    $mag = $this->tryRemoveMagazine30040ByEventId($eId, $deletionPubkey);
+                    if ($mag === 1) {
+                        ++$roots;
+                    } elseif ($mag === 2) {
+                        ++$cats;
+                    }
+                }
+            }
+
+            foreach ($aAddrs as $addr) {
+                $r = $this->removeByNip33Address($addr, $deletionPubkey, $seenArticleIds);
+                $articlesRemoved += $r['articles'];
+                $articlesPendingFlush += $r['articles'];
+                $roots += $r['roots'];
+                $cats += $r['cats'];
+            }
+        }
+
+        if ($articlesPendingFlush > 0) {
+            try {
+                $this->entityManager->flush();
+            } catch (\Throwable $e) {
+                $this->logger->error('Nip09DeletionApplier: flush failed', ['exception' => $e]);
+            }
+        }
+
+        return [
+            'articles_removed' => $articlesRemoved,
+            'magazine_roots' => $roots,
+            'magazine_categories' => $cats,
+        ];
+    }
+
+    /** 0 = none, 1 = root cache, 2 = category cache */
+    private function tryRemoveMagazine30040ByEventId(string $eventId, string $deletionPubkey): int
+    {
+        $npub = (string) $this->params->get('npub');
+        $dTag = (string) $this->params->get('d_tag');
+        if ($npub === '' || $dTag === '') {
+            return 0;
+        }
+        $root = $this->magazineIndexStore->getRoot($npub, $dTag);
+        if ($root === null) {
+            return 0;
+        }
+        if ($this->eventIdMatches($root, $eventId) && $this->pubkeyEquals($root->getPubkey(), $deletionPubkey)) {
+            $this->magazineIndexStore->deleteRoot($npub, $dTag);
+            $this->logger->notice('NIP-09: removed cached magazine root index', [
+                'event_id' => $eventId,
+            ]);
+
+            return 1;
+        }
+        foreach ($this->categorySlugsFromRoot($root) as $slug) {
+            $cat = $this->magazineIndexStore->getCategory($slug);
+            if ($cat === null) {
+                continue;
+            }
+            if ($this->eventIdMatches($cat, $eventId) && $this->pubkeyEquals($cat->getPubkey(), $deletionPubkey)) {
+                $this->magazineIndexStore->deleteCategory($slug);
+                $this->logger->notice('NIP-09: removed cached magazine category index', [
+                    'event_id' => $eventId,
+                    'slug' => $slug,
+                ]);
+
+                return 2;
+            }
+        }
+
+        return 0;
+    }
+
+    private function eventIdMatches(MagazineNostrEvent $e, string $eventId): bool
+    {
+        $a = strtolower($e->getId());
+        $b = strtolower($eventId);
+
+        return $a === $b;
+    }
+
+    private function pubkeyEquals(string $a, string $b): bool
+    {
+        if (64 !== \strlen($a) || 64 !== \strlen($b)) {
+            return $a === $b;
+        }
+
+        return strtolower($a) === strtolower($b);
+    }
+
+    /**
+     * @return list<string>
+     */
+    private function categorySlugsFromRoot(MagazineNostrEvent $root): array
+    {
+        $slugs = [];
+        foreach ($root->getTags() as $tag) {
+            if (($tag[0] ?? null) !== 'a' || !isset($tag[1])) {
+                continue;
+            }
+            $parts = explode(':', (string) $tag[1], 3);
+            if (\count($parts) < 3) {
+                continue;
+            }
+            $s = trim((string) end($parts));
+            if ($s !== '' && !\in_array($s, $slugs, true)) {
+                $slugs[] = $s;
+            }
+        }
+
+        return $slugs;
+    }
+
+    /**
+     * @param array<string, true> $seenArticleIds
+     */
+    private function removeArticleByEventIdIfValid(
+        string $eId,
+        string $deletionPubkey,
+        ?int $declaredKind,
+        array &$seenArticleIds,
+    ): bool {
+        if (isset($seenArticleIds[$eId])) {
+            return false;
+        }
+        $article = $this->articleRepository->findOneByEventId($eId);
+        if ($article === null) {
+            return false;
+        }
+        if (!$this->pubkeyEquals($article->getPubkey() ?? '', $deletionPubkey)) {
+            $this->logger->debug('NIP-09: ignore e tag (pubkey mismatch)', [
+                'event_id' => $eId,
+            ]);
+
+            return false;
+        }
+        $k = $article->getKind()?->value;
+        if ($declaredKind !== null && $k !== null && $declaredKind !== $k) {
+            return false;
+        }
+        if ($k !== null && !\in_array($k, [KindsEnum::LONGFORM->value, KindsEnum::LONGFORM_DRAFT->value], true)) {
+            return false;
+        }
+        $this->entityManager->remove($article);
+        $seenArticleIds[$eId] = true;
+        $this->logger->notice('NIP-09: removed article from database', [
+            'event_id' => $eId,
+            'kind' => $k,
+        ]);
+
+        return true;
+    }
+
+    /**
+     * NIP-33: `kind:pubkeyhex:d-identifier`
+     *
+     * @param array<string, true> $seenArticleIds
+     *
+     * @return array{articles: int, roots: int, cats: int}
+     */
+    private function removeByNip33Address(string $addr, string $deletionPubkey, array &$seenArticleIds): array
+    {
+        $out = ['articles' => 0, 'roots' => 0, 'cats' => 0];
+        $parts = explode(':', $addr, 3);
+        if (\count($parts) < 3) {
+            return $out;
+        }
+        $kind = (int) $parts[0];
+        $pk = (string) $parts[1];
+        $d = trim((string) $parts[2]);
+        if ($d === '' || !$this->pubkeyEquals($pk, $deletionPubkey)) {
+            return $out;
+        }
+
+        if ($kind === KindsEnum::LONGFORM->value || $kind === KindsEnum::LONGFORM_DRAFT->value) {
+            $article = $this->articleRepository->findOneBy(['pubkey' => $pk, 'slug' => $d]);
+            if ($article !== null) {
+                $eid = (string) ($article->getEventId() ?? '');
+                $dedupeKey = $eid !== '' ? $eid : 'ps:'.$pk."\0".$d;
+                if (!isset($seenArticleIds[$dedupeKey])) {
+                    $this->entityManager->remove($article);
+                    $seenArticleIds[$dedupeKey] = true;
+                    ++$out['articles'];
+                    $this->logger->notice('NIP-09: removed article (a tag)', [
+                        'address' => $addr,
+                    ]);
+                }
+            }
+
+            return $out;
+        }
+
+        if ($kind === KindsEnum::PUBLICATION_INDEX->value) {
+            $npub = (string) $this->params->get('npub');
+            $siteD = (string) $this->params->get('d_tag');
+            $siteHex = '';
+            if (str_starts_with($npub, 'npub1')) {
+                try {
+                    $h = (new Key())->convertToHex($npub);
+                    if (64 === \strlen($h)) {
+                        $siteHex = $h;
+                    }
+                } catch (\Throwable) {
+                }
+            }
+            if ($npub !== '' && $siteD !== '' && $d === $siteD && $siteHex !== '' && $this->pubkeyEquals($pk, $siteHex)) {
+                $this->magazineIndexStore->deleteRoot($npub, $siteD);
+                ++$out['roots'];
+                $this->logger->notice('NIP-09: removed magazine root (a tag)', ['address' => $addr]);
+            } else {
+                // Category cache is keyed by `d` only; the same d string can appear for different
+                // authors' 30040 events. Only remove if the cached event was authored by this deletion.
+                $cachedCat = $this->magazineIndexStore->getCategory($d);
+                if ($cachedCat === null) {
+                    $this->logger->debug('NIP-09: skip category delete (nothing cached for d)', [
+                        'address' => $addr,
+                        'd' => $d,
+                    ]);
+                } elseif (!$this->pubkeyEquals($cachedCat->getPubkey(), $deletionPubkey)) {
+                    $this->logger->debug('NIP-09: skip category delete (cached index author != deletion author)', [
+                        'address' => $addr,
+                        'd' => $d,
+                    ]);
+                } else {
+                    $this->magazineIndexStore->deleteCategory($d);
+                    ++$out['cats'];
+                    $this->logger->notice('NIP-09: removed magazine category (a tag)', [
+                        'address' => $addr,
+                        'd' => $d,
+                    ]);
+                }
+            }
+        }
+
+        return $out;
+    }
+
+    /**
+     * @return array{0: list<string>, 1: list<?int>} e-ids and parallel k kinds (NIP-09 example order)
+     */
+    private function parseETags(object $ev): array
+    {
+        $eIds = [];
+        $kinds = [];
+        foreach ($ev->tags ?? [] as $tag) {
+            if (!\is_array($tag) || !isset($tag[0], $tag[1])) {
+                continue;
+            }
+            if ($tag[0] === 'e') {
+                $eIds[] = (string) $tag[1];
+            }
+            if ($tag[0] === 'k') {
+                $kinds[] = (int) $tag[1];
+            }
+        }
+        $pairs = [];
+        for ($i = 0; $i < \count($eIds); ++$i) {
+            $pairs[] = $kinds[$i] ?? null;
+        }
+
+        return [$eIds, $pairs];
+    }
+
+    /**
+     * @return list<string> NIP-33 addresses
+     */
+    private function parseATags(object $ev): array
+    {
+        $a = [];
+        foreach ($ev->tags ?? [] as $tag) {
+            if (!\is_array($tag) || ($tag[0] ?? null) !== 'a' || !isset($tag[1])) {
+                continue;
+            }
+            $a[] = (string) $tag[1];
+        }
+
+        return $a;
+    }
+}
diff --git a/src/Service/NostrClient.php b/src/Service/NostrClient.php
index a752f83..96bfb06 100644
--- a/src/Service/NostrClient.php
+++ b/src/Service/NostrClient.php
@@ -316,6 +316,65 @@ class NostrClient
         return $byPub;
     }
 
+    /**
+     * NIP-09 kind 5 deletion requests in $since..$until (unix), batched by author pubkey (hex).
+     *
+     * @param list<string>        $authorPubkeyHex
+     * @return list<stdClass>     Deduplicated by event `id` (highest {@see created_at} kept)
+     */
+    public function fetchKind5DeletionEventsForAuthors(
+        array $authorPubkeyHex,
+        int $since,
+        int $until,
+        int $authorsPerRequest = 40,
+    ): array {
+        $authorPubkeyHex = \array_values(\array_unique(\array_filter(
+            $authorPubkeyHex,
+            static fn (mixed $h): bool => \is_string($h) && 64 === \strlen($h),
+        )));
+        if ($authorPubkeyHex === [] || $since >= $until) {
+            return [];
+        }
+        $authorsPerRequest = max(1, min(100, $authorsPerRequest));
+        $byId = [];
+        foreach (array_chunk($authorPubkeyHex, $authorsPerRequest) as $chunk) {
+            $request = $this->createNostrRequest(
+                kinds: [KindsEnum::DELETION_REQUEST],
+                filters: [
+                    'authors' => $chunk,
+                    'since' => $since,
+                    'until' => $until,
+                ],
+            );
+            $t0 = microtime(true);
+            $events = $this->processResponse(
+                $request->send(),
+                static fn (object $event) => $event,
+            );
+            $this->logger->info('nostr.nip09.kind5_chunk', [
+                'authors' => \count($chunk),
+                'raw_events' => \count($events),
+                'ms' => (int) round((microtime(true) - $t0) * 1000),
+            ]);
+            foreach ($events as $ev) {
+                if (!\is_object($ev) || (int) ($ev->kind ?? 0) !== KindsEnum::DELETION_REQUEST->value) {
+                    continue;
+                }
+                $id = (string) ($ev->id ?? '');
+                if (64 !== \strlen($id)) {
+                    continue;
+                }
+                $t = (int) ($ev->created_at ?? 0);
+                if (isset($byId[$id]) && $t <= (int) ($byId[$id]->created_at ?? 0)) {
+                    continue;
+                }
+                $byId[$id] = $ev;
+            }
+        }
+
+        return array_values($byId);
+    }
+
     /**
      * @throws \Exception
      */