diff --git a/migrations/2026_09_15_000000_add_snooze_and_assignment_to_alerts_table.php b/migrations/2026_09_15_000000_add_snooze_and_assignment_to_alerts_table.php
new file mode 100644
index 00000000..635dfd2e
--- /dev/null
+++ b/migrations/2026_09_15_000000_add_snooze_and_assignment_to_alerts_table.php
@@ -0,0 +1,70 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    /**
+     * Give alerts the columns a triage queue needs: when a snooze ends, who
+     * set it, who owns the alert, and when the owner planned to handle it.
+     *
+     * `Alert::snooze()` used to keep `snoozed_until` inside the `meta` JSON,
+     * which meant a list of open-but-not-snoozed alerts had to load every row
+     * and ask `isSnoozed()` one at a time. A real column can be indexed and
+     * queried, and `assigned_to_uuid` gives an alert an owner distinct from
+     * whoever acknowledged or resolved it. `planned_at` is a time the owner
+     * chose to deal with it — a scheduling hint, not a due date.
+     *
+     * Every column is guarded so the migration is safe to run against a
+     * table that already has some of them.
+     */
+    public function up(): void
+    {
+        Schema::table('alerts', function (Blueprint $table) {
+            if (!Schema::hasColumn('alerts', 'snoozed_until')) {
+                $table->timestamp('snoozed_until')->nullable()->index()->after('acknowledged_at');
+            }
+
+            if (!Schema::hasColumn('alerts', 'snoozed_by_uuid')) {
+                $table->foreignUuid('snoozed_by_uuid')->nullable()->after('resolved_by_uuid')->constrained('users', 'uuid')->nullOnDelete();
+            }
+
+            if (!Schema::hasColumn('alerts', 'assigned_to_uuid')) {
+                $table->foreignUuid('assigned_to_uuid')->nullable()->after('snoozed_by_uuid')->constrained('users', 'uuid')->nullOnDelete();
+            }
+
+            if (!Schema::hasColumn('alerts', 'planned_at')) {
+                $table->timestamp('planned_at')->nullable()->index()->after('snoozed_until');
+            }
+        });
+
+        Schema::table('alerts', function (Blueprint $table) {
+            $table->index(['company_uuid', 'status', 'snoozed_until'], 'alerts_company_status_snoozed_index');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('alerts', function (Blueprint $table) {
+            $table->dropIndex('alerts_company_status_snoozed_index');
+        });
+
+        Schema::table('alerts', function (Blueprint $table) {
+            foreach (['snoozed_by_uuid', 'assigned_to_uuid'] as $column) {
+                if (Schema::hasColumn('alerts', $column)) {
+                    $table->dropConstrainedForeignId($column);
+                }
+            }
+
+            foreach (['planned_at', 'snoozed_until'] as $column) {
+                if (Schema::hasColumn('alerts', $column)) {
+                    $table->dropColumn($column);
+                }
+            }
+        });
+    }
+};
diff --git a/src/Models/Alert.php b/src/Models/Alert.php
index b84a5f3a..6c49044f 100644
--- a/src/Models/Alert.php
+++ b/src/Models/Alert.php
@@ -81,6 +81,10 @@ class Alert extends Model
         'resolved_at',
         'acknowledged_by_uuid',
         'resolved_by_uuid',
+        'snoozed_until',
+        'snoozed_by_uuid',
+        'assigned_to_uuid',
+        'planned_at',
         'meta',
     ];
 
@@ -93,8 +97,10 @@ class Alert extends Model
         'subject_name',
         'acknowledged_by_name',
         'resolved_by_name',
+        'assigned_to_name',
         'is_acknowledged',
         'is_resolved',
+        'is_snoozed',
         'duration_minutes',
         'age_minutes',
     ];
@@ -104,7 +110,7 @@ class Alert extends Model
      *
      * @var array
      */
-    protected $hidden = ['subject', 'acknowledgedBy', 'resolvedBy'];
+    protected $hidden = ['subject', 'acknowledgedBy', 'resolvedBy', 'snoozedBy', 'assignedTo'];
 
     /**
      * The attributes that should be cast to native types.
@@ -117,6 +123,8 @@ class Alert extends Model
         'triggered_at'    => 'datetime',
         'acknowledged_at' => 'datetime',
         'resolved_at'     => 'datetime',
+        'snoozed_until'   => 'datetime',
+        'planned_at'      => 'datetime',
         'meta'            => Json::class,
     ];
 
@@ -159,6 +167,16 @@ public function resolvedBy(): BelongsTo
         return $this->belongsTo(User::class, 'resolved_by_uuid', 'uuid');
     }
 
+    public function snoozedBy(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'snoozed_by_uuid', 'uuid');
+    }
+
+    public function assignedTo(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'assigned_to_uuid', 'uuid');
+    }
+
     public function subject(): MorphTo
     {
         return $this->morphTo();
@@ -192,6 +210,22 @@ public function getResolvedByNameAttribute(): ?string
         return $this->resolvedBy?->name;
     }
 
+    /**
+     * Get the name of the user the alert is assigned to.
+     */
+    public function getAssignedToNameAttribute(): ?string
+    {
+        return $this->assignedTo?->name;
+    }
+
+    /**
+     * Whether the alert is snoozed right now.
+     */
+    public function getIsSnoozedAttribute(): bool
+    {
+        return $this->isSnoozed();
+    }
+
     /**
      * Check if the alert has been acknowledged.
      */
@@ -302,6 +336,32 @@ public function scopeUnacknowledged($query)
         return $query->whereNull('acknowledged_at');
     }
 
+    /**
+     * Scope to alerts whose snooze has not ended yet.
+     *
+     * @param \Illuminate\Database\Eloquent\Builder $query
+     *
+     * @return \Illuminate\Database\Eloquent\Builder
+     */
+    public function scopeSnoozed($query)
+    {
+        return $query->whereNotNull('snoozed_until')->where('snoozed_until', '>', now());
+    }
+
+    /**
+     * Scope to alerts that still need someone: not resolved and not snoozed.
+     *
+     * @param \Illuminate\Database\Eloquent\Builder $query
+     *
+     * @return \Illuminate\Database\Eloquent\Builder
+     */
+    public function scopeActive($query)
+    {
+        return $query->where('status', '!=', 'resolved')->where(function ($query) {
+            $query->whereNull('snoozed_until')->orWhere('snoozed_until', '<=', now());
+        });
+    }
+
     /**
      * Scope to get critical alerts.
      *
@@ -337,10 +397,16 @@ public function acknowledge(?User $user = null): bool
 
         $user = $user ?? auth()->user();
 
-        $updated = $this->update([
+        $updateData = [
             'acknowledged_at'      => now(),
             'acknowledged_by_uuid' => $user?->uuid,
-        ]);
+        ];
+
+        if ($this->status === 'open') {
+            $updateData['status'] = 'acknowledged';
+        }
+
+        $updated = $this->update($updateData);
 
         if ($updated) {
             activity('alert_acknowledged')
@@ -438,16 +504,25 @@ public function escalate(string $newSeverity, ?string $reason = null): bool
 
     /**
      * Snooze the alert for a specified duration.
+     *
+     * The wake time lives in `snoozed_until` so a queue can exclude snoozed
+     * alerts in the query; the reason stays in `meta` as before.
      */
-    public function snooze(int $minutes, ?string $reason = null): bool
+    public function snooze(int $minutes, ?string $reason = null, ?User $user = null): bool
     {
         $snoozeUntil = now()->addMinutes($minutes);
+        $actor       = auth()->user();
+        $user        = $user ?? ($actor instanceof User ? $actor : null);
 
         $meta                  = $this->meta ?? [];
-        $meta['snoozed_until'] = $snoozeUntil;
         $meta['snooze_reason'] = $reason;
+        unset($meta['snoozed_until']);
 
-        $updated = $this->update(['meta' => $meta]);
+        $updated = $this->update([
+            'snoozed_until'   => $snoozeUntil,
+            'snoozed_by_uuid' => $user?->uuid,
+            'meta'            => $meta,
+        ]);
 
         if ($updated) {
             activity('alert_snoozed')
@@ -456,6 +531,7 @@ public function snooze(int $minutes, ?string $reason = null): bool
                     'snoozed_for_minutes' => $minutes,
                     'snoozed_until'       => $snoozeUntil,
                     'reason'              => $reason,
+                    'snoozed_by'          => $user?->name,
                 ])
                 ->log('Alert snoozed');
         }
@@ -463,13 +539,55 @@ public function snooze(int $minutes, ?string $reason = null): bool
         return $updated;
     }
 
+    /**
+     * End a snooze early so the alert is active again.
+     */
+    public function unsnooze(): bool
+    {
+        if (!$this->snoozed_until) {
+            return false;
+        }
+
+        $updated = $this->update([
+            'snoozed_until'   => null,
+            'snoozed_by_uuid' => null,
+        ]);
+
+        if ($updated) {
+            activity('alert_unsnoozed')
+                ->performedOn($this)
+                ->log('Alert snooze ended');
+        }
+
+        return $updated;
+    }
+
+    /**
+     * Give the alert an owner (or clear it with null).
+     */
+    public function assignTo(?User $user): bool
+    {
+        $updated = $this->update(['assigned_to_uuid' => $user?->uuid]);
+
+        if ($updated) {
+            activity('alert_assigned')
+                ->performedOn($this)
+                ->withProperties(['assigned_to' => $user?->name])
+                ->log($user ? 'Alert assigned' : 'Alert unassigned');
+        }
+
+        return $updated;
+    }
+
     /**
      * Check if the alert is currently snoozed.
+     *
+     * Reads the column, falling back to the `meta.snoozed_until` value older
+     * rows were written with before the column existed.
      */
     public function isSnoozed(): bool
     {
-        $meta        = $this->meta ?? [];
-        $snoozeUntil = $meta['snoozed_until'] ?? null;
+        $snoozeUntil = $this->snoozed_until ?? ($this->meta['snoozed_until'] ?? null);
 
         if (!$snoozeUntil) {
             return false;
diff --git a/tests/Unit/Models/OperationalModelsTest.php b/tests/Unit/Models/OperationalModelsTest.php
index 1c72b4fd..4978d81d 100644
--- a/tests/Unit/Models/OperationalModelsTest.php
+++ b/tests/Unit/Models/OperationalModelsTest.php
@@ -201,6 +201,10 @@ public function clear(): bool
         $table->timestamp('resolved_at')->nullable();
         $table->string('acknowledged_by_uuid')->nullable();
         $table->string('resolved_by_uuid')->nullable();
+        $table->string('snoozed_by_uuid')->nullable();
+        $table->string('assigned_to_uuid')->nullable();
+        $table->timestamp('snoozed_until')->nullable();
+        $table->timestamp('planned_at')->nullable();
         $table->text('meta')->nullable();
         $table->timestamps();
         $table->softDeletes();
@@ -292,8 +296,12 @@ public function clear(): bool
     expect($alert->getActivitylogOptions()->logAttributes)->toBe(['*'])
         ->and($alert->acknowledgedBy()->getForeignKeyName())->toBe('acknowledged_by_uuid')
         ->and($alert->resolvedBy()->getForeignKeyName())->toBe('resolved_by_uuid')
+        ->and($alert->snoozedBy()->getForeignKeyName())->toBe('snoozed_by_uuid')
+        ->and($alert->assignedTo()->getForeignKeyName())->toBe('assigned_to_uuid')
         ->and($alert->subject()->getMorphType())->toBe('subject_type')
         ->and($alert->subject_name)->toBeNull()
+        ->and($alert->assigned_to_name)->toBeNull()
+        ->and($alert->is_snoozed)->toBeFalse()
         ->and($alert->duration_minutes)->toBeNull()
         ->and($alert->age_minutes)->toBe(15)
         ->and($alert->isSnoozed())->toBeFalse()
@@ -326,6 +334,7 @@ public function clear(): bool
     expect($alert->acknowledge($user))->toBeTrue()
         ->and($alert->updates[0]['acknowledged_at']->toISOString())->toBe('2026-07-17T12:00:00.000000Z')
         ->and($alert->updates[0]['acknowledged_by_uuid'])->toBe('user-1')
+        ->and($alert->updates[0]['status'])->toBe('acknowledged')
         ->and($alert->acknowledge($user))->toBeFalse()
         ->and($alert->resolve($user, 'Sensor recalibrated'))->toBeTrue()
         ->and($alert->updates[1]['status'])->toBe('resolved')
@@ -350,9 +359,79 @@ public function clear(): bool
         ->and($escalatingAlert->updates[0]['meta']['escalation_history'][0]['from'])->toBe('low')
         ->and($escalatingAlert->updates[0]['meta']['escalation_history'][0]['to'])->toBe('medium')
         ->and($escalatingAlert->updates[0]['meta']['escalation_history'][0]['escalated_by'])->toBe('session-user')
-        ->and($escalatingAlert->snooze(30, 'Awaiting technician'))->toBeTrue()
+        ->and($escalatingAlert->snooze(30, 'Awaiting technician', $user))->toBeTrue()
         ->and($escalatingAlert->updates[1]['meta']['snooze_reason'])->toBe('Awaiting technician')
-        ->and($escalatingAlert->isSnoozed())->toBeTrue();
+        ->and($escalatingAlert->updates[1]['snoozed_until']->toISOString())->toBe('2026-07-17T12:30:00.000000Z')
+        ->and($escalatingAlert->updates[1]['snoozed_by_uuid'])->toBe('user-1')
+        ->and($escalatingAlert->isSnoozed())->toBeTrue()
+        ->and($escalatingAlert->is_snoozed)->toBeTrue()
+        ->and($escalatingAlert->unsnooze())->toBeTrue()
+        ->and($escalatingAlert->updates[2])->toBe(['snoozed_until' => null, 'snoozed_by_uuid' => null])
+        ->and($escalatingAlert->isSnoozed())->toBeFalse()
+        ->and($escalatingAlert->unsnooze())->toBeFalse()
+        ->and($escalatingAlert->assignTo($user))->toBeTrue()
+        ->and($escalatingAlert->updates[3])->toBe(['assigned_to_uuid' => 'user-1'])
+        ->and($escalatingAlert->assignTo(null))->toBeTrue()
+        ->and($escalatingAlert->updates[4])->toBe(['assigned_to_uuid' => null]);
+
+    // Rows written before the column existed kept the wake time in meta.
+    $legacyAlert = new Alert();
+    $legacyAlert->setRawAttributes([
+        'uuid'   => 'alert-legacy',
+        'status' => 'open',
+        'meta'   => ['snoozed_until' => '2026-07-17 13:00:00'],
+    ], true);
+
+    expect($legacyAlert->isSnoozed())->toBeTrue();
+
+    Carbon::setTestNow();
+});
+
+it('filters alerts through the snoozed and active scopes', function () {
+    $capsule = operational_models_database();
+    Carbon::setTestNow(Carbon::parse('2026-07-17 12:00:00', 'UTC'));
+
+    $capsule->getConnection('mysql')->table('alerts')->insert([
+        [
+            'uuid'          => 'alert-open',
+            'type'          => 'temperature',
+            'severity'      => 'high',
+            'status'        => 'open',
+            'snoozed_until' => null,
+            'created_at'    => '2026-07-17 10:00:00',
+            'updated_at'    => '2026-07-17 10:00:00',
+        ],
+        [
+            'uuid'          => 'alert-snoozed',
+            'type'          => 'temperature',
+            'severity'      => 'high',
+            'status'        => 'acknowledged',
+            'snoozed_until' => '2026-07-17 14:00:00',
+            'created_at'    => '2026-07-17 10:00:00',
+            'updated_at'    => '2026-07-17 10:00:00',
+        ],
+        [
+            'uuid'          => 'alert-woken',
+            'type'          => 'temperature',
+            'severity'      => 'high',
+            'status'        => 'open',
+            'snoozed_until' => '2026-07-17 11:00:00',
+            'created_at'    => '2026-07-17 10:00:00',
+            'updated_at'    => '2026-07-17 10:00:00',
+        ],
+        [
+            'uuid'          => 'alert-resolved',
+            'type'          => 'temperature',
+            'severity'      => 'high',
+            'status'        => 'resolved',
+            'snoozed_until' => null,
+            'created_at'    => '2026-07-17 10:00:00',
+            'updated_at'    => '2026-07-17 10:00:00',
+        ],
+    ]);
+
+    expect(Alert::query()->snoozed()->pluck('uuid')->all())->toBe(['alert-snoozed'])
+        ->and(Alert::query()->active()->pluck('uuid')->all())->toBe(['alert-open', 'alert-woken']);
 
     Carbon::setTestNow();
 });