diff --git a/cloud/src/Ingest/IngestController.php b/cloud/src/Ingest/IngestController.php
new file mode 100644
index 0000000..bc9f8ed
--- /dev/null
+++ b/cloud/src/Ingest/IngestController.php
@@ -0,0 +1,62 @@
+<?php
+declare(strict_types=1);
+namespace App\Ingest;
+
+use App\Config;
+use App\Http\{Request, Response};
+use App\Security\Hmac;
+use App\Repository\{DeviceRepository, NonceRepository, RateLimiterRepository,
+    EventRepository, SnapshotRepository};
+
+final class IngestController
+{
+    public function __construct(
+        private Config $cfg,
+        private DeviceRepository $devices,
+        private NonceRepository $nonces,
+        private RateLimiterRepository $rateLimiter,
+        private EventRepository $events,
+        private SnapshotRepository $snapshots,
+    ) {}
+
+    public function handle(Request $req, int $now): Response
+    {
+        $payload = $req->json();
+        $deviceId = (string)($payload['device_id'] ?? '');
+        $window = intdiv($now, 60);
+        if ($deviceId !== '' && $this->rateLimiter->hit($deviceId, $window) > $this->cfg->rateLimitPerMin()) {
+            return Response::json(['error' => 'rate_limited'], 429);
+        }
+
+        $nonce = $req->header('X-Nonce') ?? '';
+        $ts = $req->header('X-Timestamp') ?? '';
+        $sig = $req->header('X-Signature') ?? '';
+        $secret = $deviceId !== '' ? $this->devices->secretFor($deviceId) : null;
+        if ($secret === null || $nonce === '' || $ts === '' || $sig === '') {
+            return Response::json(['error' => 'unauthorized'], 401);
+        }
+        if (!Hmac::verify($secret, $nonce, $ts, $req->body(), $sig)) {
+            return Response::json(['error' => 'bad_signature'], 401);
+        }
+        if (abs($now - (int)(float)$ts) > $this->cfg->timestampWindow()) {
+            return Response::json(['error' => 'stale_timestamp'], 401);
+        }
+        if ($this->nonces->seen($nonce)) {
+            return Response::json(['error' => 'replay'], 401);
+        }
+        $this->nonces->remember($nonce, $now + $this->cfg->nonceTtl());
+
+        $v = EventValidator::validate($payload);
+        if (!$v['ok']) return Response::json(['error' => 'invalid', 'details' => $v['errors']], 400);
+
+        $eventId = $this->events->insert($v['clean']);
+        foreach (($payload['snapshots'] ?? []) as $b64) {
+            $img = ImageProcessor::reencode((string)$b64);
+            if (!$img['ok']) continue;
+            $path = rtrim($this->cfg->snapshotDir(), '/\\') . '/' . $img['uuid'] . '.jpg';
+            file_put_contents($path, $img['bytes']);
+            $this->snapshots->add($eventId, $img['uuid'], $img['hash']);
+        }
+        return Response::json(['event_id' => $eventId], 201);
+    }
+}
diff --git a/cloud/tests/IngestControllerTest.php b/cloud/tests/IngestControllerTest.php
new file mode 100644
index 0000000..88ab23f
--- /dev/null
+++ b/cloud/tests/IngestControllerTest.php
@@ -0,0 +1,68 @@
+<?php
+declare(strict_types=1);
+namespace App\Tests;
+use App\Config;
+use App\Http\Request;
+use App\Security\Hmac;
+use App\Ingest\IngestController;
+use App\Tests\Support\{InMemoryDeviceRepository, InMemoryNonceRepository,
+    InMemoryRateLimiter, InMemoryEventRepository, InMemorySnapshotRepository};
+use PHPUnit\Framework\TestCase;
+
+final class IngestControllerTest extends TestCase
+{
+    private string $dir;
+    protected function setUp(): void { $this->dir = sys_get_temp_dir() . '/snaps' . bin2hex(random_bytes(4)); mkdir($this->dir); }
+
+    private function make(array $secrets = ['pi-1' => 'sekret']): array {
+        $cfg = Config::fromArray(['snapshot_dir' => $this->dir, 'timestamp_window' => 300, 'rate_limit_per_min' => 60]);
+        $dev = new InMemoryDeviceRepository($secrets);
+        $nonce = new InMemoryNonceRepository();
+        $rl = new InMemoryRateLimiter();
+        $events = new InMemoryEventRepository();
+        $snaps = new InMemorySnapshotRepository();
+        $c = new IngestController($cfg, $dev, $nonce, $rl, $events, $snaps);
+        return [$c, $events, $snaps, $nonce];
+    }
+    private function jpegB64(): string { $im = imagecreatetruecolor(8, 8); ob_start(); imagejpeg($im); $b = ob_get_clean(); imagedestroy($im); return base64_encode($b); }
+
+    private function signedReq(string $secret, array $payload, string $nonce = 'n1', string $ts = '1000'): Request {
+        $body = json_encode($payload, JSON_UNESCAPED_UNICODE);
+        $sig = Hmac::sign($secret, $nonce, $ts, $body);
+        return new Request('POST', '/api/events',
+            ['X-Nonce' => $nonce, 'X-Timestamp' => $ts, 'X-Signature' => $sig], $body, [], []);
+    }
+    private function payload(): array {
+        return ['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
+                'severity' => 'high', 'occurred_at' => 1000.0, 'snapshots' => [$this->jpegB64()]];
+    }
+
+    public function testAcceptsValidSignedEvent(): void {
+        [$c, $events, $snaps] = $this->make();
+        $res = $c->handle($this->signedReq('sekret', $this->payload()), now: 1000);
+        $this->assertSame(201, $res->status());
+        $this->assertCount(1, $events->rows);
+        $id = json_decode($res->body(), true)['event_id'];
+        $this->assertCount(1, $snaps->forEvent($id)); // snapshot re-encoded + stored
+    }
+    public function testRejectsBadSignature(): void {
+        [$c] = $this->make();
+        $req = $this->signedReq('WRONG', $this->payload());
+        $this->assertSame(401, $c->handle($req, now: 1000)->status());
+    }
+    public function testRejectsReplayedNonce(): void {
+        [$c] = $this->make();
+        $req = $this->signedReq('sekret', $this->payload());
+        $this->assertSame(201, $c->handle($req, now: 1000)->status());
+        $this->assertSame(401, $c->handle($req, now: 1000)->status()); // same nonce again
+    }
+    public function testRejectsStaleTimestamp(): void {
+        [$c] = $this->make();
+        $req = $this->signedReq('sekret', $this->payload(), ts: '1000');
+        $this->assertSame(401, $c->handle($req, now: 5000)->status()); // 4000s > 300 window
+    }
+    public function testRejectsUnknownDevice(): void {
+        [$c] = $this->make([]); // no secrets
+        $this->assertSame(401, $c->handle($this->signedReq('x', $this->payload()), now: 1000)->status());
+    }
+}