diff --git a/app/Http/Controllers/Api/V1/StatController.php b/app/Http/Controllers/Api/V1/StatController.php
new file mode 100644
index 0000000..78ff96d
--- /dev/null
+++ b/app/Http/Controllers/Api/V1/StatController.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Helpers\ApiResponse;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\V1\Stat\StatAlertRequest;
+use App\Http\Requests\V1\Stat\StatDailyRequest;
+use App\Http\Requests\V1\Stat\StatMonthlyRequest;
+use App\Services\Stats\StatQueryService;
+use Illuminate\Http\JsonResponse;
+
+class StatController extends Controller
+{
+    public function __construct(
+        private readonly StatQueryService $statQueryService
+    ) {}
+
+    /**
+     * 대시보드 요약 통계 (sam_stat 기반)
+     */
+    public function summary(): JsonResponse
+    {
+        $data = $this->statQueryService->getDashboardSummary();
+
+        return ApiResponse::handle(['data' => $data], __('message.fetched'));
+    }
+
+    /**
+     * 일간 통계 조회
+     */
+    public function daily(StatDailyRequest $request): JsonResponse
+    {
+        $data = $this->statQueryService->getDailyStat(
+            $request->validated('domain'),
+            $request->validated()
+        );
+
+        return ApiResponse::handle(['data' => $data], __('message.fetched'));
+    }
+
+    /**
+     * 월간 통계 조회
+     */
+    public function monthly(StatMonthlyRequest $request): JsonResponse
+    {
+        $data = $this->statQueryService->getMonthlyStat(
+            $request->validated('domain'),
+            $request->validated()
+        );
+
+        return ApiResponse::handle(['data' => $data], __('message.fetched'));
+    }
+
+    /**
+     * 알림 목록 조회
+     */
+    public function alerts(StatAlertRequest $request): JsonResponse
+    {
+        $data = $this->statQueryService->getAlerts($request->validated());
+
+        return ApiResponse::handle(['data' => $data], __('message.fetched'));
+    }
+}
diff --git a/app/Http/Requests/V1/Stat/StatAlertRequest.php b/app/Http/Requests/V1/Stat/StatAlertRequest.php
new file mode 100644
index 0000000..fdc51c3
--- /dev/null
+++ b/app/Http/Requests/V1/Stat/StatAlertRequest.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Requests\V1\Stat;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StatAlertRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'limit' => 'nullable|integer|min:1|max:100',
+            'unread_only' => 'nullable|boolean',
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/Stat/StatDailyRequest.php b/app/Http/Requests/V1/Stat/StatDailyRequest.php
new file mode 100644
index 0000000..42b24b0
--- /dev/null
+++ b/app/Http/Requests/V1/Stat/StatDailyRequest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Requests\V1\Stat;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StatDailyRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'domain' => 'required|string|in:sales,finance,production,inventory,quote,hr,system',
+            'start_date' => 'required|date|date_format:Y-m-d',
+            'end_date' => 'required|date|date_format:Y-m-d|after_or_equal:start_date',
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/Stat/StatMonthlyRequest.php b/app/Http/Requests/V1/Stat/StatMonthlyRequest.php
new file mode 100644
index 0000000..04b2eb7
--- /dev/null
+++ b/app/Http/Requests/V1/Stat/StatMonthlyRequest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Requests\V1\Stat;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StatMonthlyRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'domain' => 'required|string|in:sales,finance,production,project',
+            'year' => 'required|integer|min:2020|max:2099',
+            'month' => 'nullable|integer|min:1|max:12',
+        ];
+    }
+}
diff --git a/app/Models/Stats/Daily/StatSystemDaily.php b/app/Models/Stats/Daily/StatSystemDaily.php
new file mode 100644
index 0000000..2b60a27
--- /dev/null
+++ b/app/Models/Stats/Daily/StatSystemDaily.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Models\Stats\Daily;
+
+use App\Models\Stats\BaseStatModel;
+
+class StatSystemDaily extends BaseStatModel
+{
+    protected $table = 'stat_system_daily';
+
+    protected $casts = [
+        'stat_date' => 'date',
+        'file_upload_size_mb' => 'decimal:2',
+        'approval_avg_hours' => 'decimal:2',
+    ];
+}
diff --git a/app/Models/Stats/Monthly/StatProjectMonthly.php b/app/Models/Stats/Monthly/StatProjectMonthly.php
new file mode 100644
index 0000000..b4e5c1e
--- /dev/null
+++ b/app/Models/Stats/Monthly/StatProjectMonthly.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models\Stats\Monthly;
+
+use App\Models\Stats\BaseStatModel;
+
+class StatProjectMonthly extends BaseStatModel
+{
+    protected $table = 'stat_project_monthly';
+
+    protected $casts = [
+        'contract_total_amount' => 'decimal:2',
+        'expected_expense_total' => 'decimal:2',
+        'actual_expense_total' => 'decimal:2',
+        'labor_cost_total' => 'decimal:2',
+        'material_cost_total' => 'decimal:2',
+        'gross_profit' => 'decimal:2',
+        'gross_profit_rate' => 'decimal:2',
+    ];
+}
diff --git a/app/Models/Stats/StatEvent.php b/app/Models/Stats/StatEvent.php
new file mode 100644
index 0000000..a260284
--- /dev/null
+++ b/app/Models/Stats/StatEvent.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models\Stats;
+
+class StatEvent extends BaseStatModel
+{
+    protected $table = 'stat_events';
+
+    public $timestamps = false;
+
+    protected $casts = [
+        'payload' => 'array',
+        'occurred_at' => 'datetime',
+    ];
+}
diff --git a/app/Models/Stats/StatSnapshot.php b/app/Models/Stats/StatSnapshot.php
new file mode 100644
index 0000000..dd3cf96
--- /dev/null
+++ b/app/Models/Stats/StatSnapshot.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Models\Stats;
+
+class StatSnapshot extends BaseStatModel
+{
+    protected $table = 'stat_snapshots';
+
+    public $timestamps = false;
+
+    protected $casts = [
+        'snapshot_date' => 'date',
+        'data' => 'array',
+        'created_at' => 'datetime',
+    ];
+}
diff --git a/app/Observers/StatEventObserver.php b/app/Observers/StatEventObserver.php
new file mode 100644
index 0000000..5da33eb
--- /dev/null
+++ b/app/Observers/StatEventObserver.php
@@ -0,0 +1,96 @@
+<?php
+
+namespace App\Observers;
+
+use App\Services\Stats\StatEventService;
+use Illuminate\Database\Eloquent\Model;
+
+class StatEventObserver
+{
+    private static array $domainMap = [
+        'App\Models\Tenants\Order' => 'sales',
+        'App\Models\Tenants\Sale' => 'sales',
+        'App\Models\Tenants\Deposit' => 'finance',
+        'App\Models\Tenants\Withdrawal' => 'finance',
+        'App\Models\Tenants\Purchase' => 'finance',
+        'App\Models\Production\WorkOrder' => 'production',
+        'App\Models\Tenants\Approval' => 'system',
+    ];
+
+    public function created(Model $model): void
+    {
+        $this->recordEvent($model, 'created');
+    }
+
+    public function updated(Model $model): void
+    {
+        $this->recordEvent($model, 'updated');
+    }
+
+    public function deleted(Model $model): void
+    {
+        $this->recordEvent($model, 'deleted');
+    }
+
+    private function recordEvent(Model $model, string $action): void
+    {
+        $tenantId = $model->getAttribute('tenant_id');
+        if (! $tenantId) {
+            return;
+        }
+
+        $className = get_class($model);
+        $domain = self::$domainMap[$className] ?? 'other';
+        $entityType = class_basename($model);
+        $eventType = strtolower($entityType).'_'.$action;
+
+        $payload = match ($action) {
+            'created' => $this->getCreatedPayload($model),
+            'updated' => $this->getUpdatedPayload($model),
+            'deleted' => ['id' => $model->getKey()],
+            default => null,
+        };
+
+        app(StatEventService::class)->recordEvent(
+            $tenantId,
+            $domain,
+            $eventType,
+            $entityType,
+            $model->getKey(),
+            $payload
+        );
+    }
+
+    private function getCreatedPayload(Model $model): array
+    {
+        $payload = ['id' => $model->getKey()];
+
+        if ($model->getAttribute('total_amount') !== null) {
+            $payload['amount'] = $model->getAttribute('total_amount');
+        }
+        if ($model->getAttribute('amount') !== null) {
+            $payload['amount'] = $model->getAttribute('amount');
+        }
+        if ($model->getAttribute('status') !== null) {
+            $payload['status'] = $model->getAttribute('status');
+        }
+
+        return $payload;
+    }
+
+    private function getUpdatedPayload(Model $model): array
+    {
+        $changed = $model->getChanges();
+        $payload = ['id' => $model->getKey()];
+
+        if (isset($changed['status'])) {
+            $payload['old_status'] = $model->getOriginal('status');
+            $payload['new_status'] = $changed['status'];
+        }
+        if (isset($changed['total_amount']) || isset($changed['amount'])) {
+            $payload['amount'] = $changed['total_amount'] ?? $changed['amount'];
+        }
+
+        return $payload;
+    }
+}
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index d083f5e..ac3963a 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -14,6 +14,7 @@
 use App\Models\Tenants\Deposit;
 use App\Models\Tenants\ExpectedExpense;
 use App\Models\Tenants\Purchase;
+use App\Models\Tenants\Sale;
 use App\Models\Tenants\Stock;
 use App\Models\Tenants\Tenant;
 use App\Models\Tenants\Withdrawal;
@@ -21,6 +22,7 @@
 use App\Observers\ExpenseSync\PurchaseExpenseSyncObserver;
 use App\Observers\ExpenseSync\WithdrawalExpenseSyncObserver;
 use App\Observers\MenuObserver;
+use App\Observers\StatEventObserver;
 use App\Observers\TenantObserver;
 use App\Observers\TodayIssue\ApprovalIssueObserver;
 use App\Observers\TodayIssue\ApprovalStepIssueObserver;
@@ -96,5 +98,13 @@ public function boot(): void
         Purchase::observe(PurchaseExpenseSyncObserver::class);
         Withdrawal::observe(WithdrawalExpenseSyncObserver::class);
         Bill::observe(BillExpenseSyncObserver::class);
+
+        // 통계 이벤트 기록 (stat_events 테이블)
+        Order::observe(StatEventObserver::class);
+        Sale::observe(StatEventObserver::class);
+        Deposit::observe(StatEventObserver::class);
+        Withdrawal::observe(StatEventObserver::class);
+        Purchase::observe(StatEventObserver::class);
+        Approval::observe(StatEventObserver::class);
     }
 }
diff --git a/app/Services/DashboardService.php b/app/Services/DashboardService.php
index 5423370..22ed143 100644
--- a/app/Services/DashboardService.php
+++ b/app/Services/DashboardService.php
@@ -2,6 +2,8 @@
 
 namespace App\Services;
 
+use App\Models\Stats\Monthly\StatFinanceMonthly;
+use App\Models\Stats\Monthly\StatSalesMonthly;
 use App\Models\Tenants\Approval;
 use App\Models\Tenants\ApprovalStep;
 use App\Models\Tenants\Attendance;
@@ -114,23 +116,36 @@ private function getTodaySummary(int $tenantId, Carbon $today): array
     }
 
     /**
-     * 재무 요약 데이터
+     * 재무 요약 데이터 (sam_stat 우선, 폴백: 원본 DB)
      */
     private function getFinanceSummary(int $tenantId, Carbon $startOfMonth, Carbon $endOfMonth): array
     {
-        // 월간 입금 합계
+        // sam_stat 월간 데이터 시도
+        $monthly = StatFinanceMonthly::where('tenant_id', $tenantId)
+            ->where('stat_year', $startOfMonth->year)
+            ->where('stat_month', $startOfMonth->month)
+            ->first();
+
+        if ($monthly) {
+            return [
+                'monthly_deposit' => (float) $monthly->deposit_amount,
+                'monthly_withdrawal' => (float) $monthly->withdrawal_amount,
+                'balance' => (float) ($monthly->deposit_amount - $monthly->withdrawal_amount),
+                'source' => 'sam_stat',
+            ];
+        }
+
+        // 폴백: 원본 DB 실시간 집계
         $monthlyDeposit = Deposit::query()
             ->where('tenant_id', $tenantId)
             ->whereBetween('deposit_date', [$startOfMonth, $endOfMonth])
             ->sum('amount');
 
-        // 월간 출금 합계
         $monthlyWithdrawal = Withdrawal::query()
             ->where('tenant_id', $tenantId)
             ->whereBetween('withdrawal_date', [$startOfMonth, $endOfMonth])
             ->sum('amount');
 
-        // 현재 잔액 (전체 입금 - 전체 출금)
         $totalDeposits = Deposit::query()
             ->where('tenant_id', $tenantId)
             ->sum('amount');
@@ -145,21 +160,35 @@ private function getFinanceSummary(int $tenantId, Carbon $startOfMonth, Carbon $
             'monthly_deposit' => (float) $monthlyDeposit,
             'monthly_withdrawal' => (float) $monthlyWithdrawal,
             'balance' => (float) $balance,
+            'source' => 'samdb',
         ];
     }
 
     /**
-     * 매출/매입 요약 데이터
+     * 매출/매입 요약 데이터 (sam_stat 우선, 폴백: 원본 DB)
      */
     private function getSalesSummary(int $tenantId, Carbon $startOfMonth, Carbon $endOfMonth): array
     {
-        // 월간 매출 합계
+        // sam_stat 월간 데이터 시도
+        $monthly = StatSalesMonthly::where('tenant_id', $tenantId)
+            ->where('stat_year', $startOfMonth->year)
+            ->where('stat_month', $startOfMonth->month)
+            ->first();
+
+        if ($monthly) {
+            return [
+                'monthly_sales' => (float) $monthly->sales_amount,
+                'monthly_purchases' => 0,
+                'source' => 'sam_stat',
+            ];
+        }
+
+        // 폴백: 원본 DB 실시간 집계
         $monthlySales = Sale::query()
             ->where('tenant_id', $tenantId)
             ->whereBetween('sale_date', [$startOfMonth, $endOfMonth])
             ->sum('total_amount');
 
-        // 월간 매입 합계
         $monthlyPurchases = Purchase::query()
             ->where('tenant_id', $tenantId)
             ->whereBetween('purchase_date', [$startOfMonth, $endOfMonth])
@@ -168,6 +197,7 @@ private function getSalesSummary(int $tenantId, Carbon $startOfMonth, Carbon $en
         return [
             'monthly_sales' => (float) $monthlySales,
             'monthly_purchases' => (float) $monthlyPurchases,
+            'source' => 'samdb',
         ];
     }
 
diff --git a/app/Services/Stats/ProjectStatService.php b/app/Services/Stats/ProjectStatService.php
new file mode 100644
index 0000000..6929c7b
--- /dev/null
+++ b/app/Services/Stats/ProjectStatService.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace App\Services\Stats;
+
+use App\Models\Stats\Monthly\StatProjectMonthly;
+use Carbon\Carbon;
+use Illuminate\Support\Facades\DB;
+
+class ProjectStatService implements StatDomainServiceInterface
+{
+    public function aggregateDaily(int $tenantId, Carbon $date): int
+    {
+        // 건설/프로젝트는 월간 전용 (일간 집계 없음)
+        return 0;
+    }
+
+    public function aggregateMonthly(int $tenantId, int $year, int $month): int
+    {
+        $startDate = Carbon::create($year, $month, 1)->startOfDay();
+        $endDate = $startDate->copy()->endOfMonth();
+
+        // 현장 현황
+        $activeSites = DB::connection('mysql')
+            ->table('sites')
+            ->where('tenant_id', $tenantId)
+            ->where('status', 'active')
+            ->whereNull('deleted_at')
+            ->count();
+
+        $completedSites = DB::connection('mysql')
+            ->table('sites')
+            ->where('tenant_id', $tenantId)
+            ->where('status', 'completed')
+            ->whereNull('deleted_at')
+            ->count();
+
+        // 계약 현황 (해당 월 신규 계약)
+        $contractStats = DB::connection('mysql')
+            ->table('contracts')
+            ->where('tenant_id', $tenantId)
+            ->whereBetween('created_at', [$startDate, $endDate])
+            ->whereNull('deleted_at')
+            ->selectRaw('
+                COUNT(*) as new_count,
+                COALESCE(SUM(contract_amount), 0) as total_amount
+            ')
+            ->first();
+
+        // 지출예상 (해당 월)
+        $expenseStats = DB::connection('mysql')
+            ->table('expected_expenses')
+            ->where('tenant_id', $tenantId)
+            ->whereYear('expected_payment_date', $year)
+            ->whereMonth('expected_payment_date', $month)
+            ->whereNull('deleted_at')
+            ->selectRaw('
+                COALESCE(SUM(amount), 0) as expected_total,
+                COALESCE(SUM(CASE WHEN payment_status = \'paid\' THEN amount ELSE 0 END), 0) as actual_total
+            ')
+            ->first();
+
+        // 수익률 계산
+        $contractTotal = (float) ($contractStats->total_amount ?? 0);
+        $actualExpense = (float) ($expenseStats->actual_total ?? 0);
+        $grossProfit = $contractTotal - $actualExpense;
+        $grossProfitRate = $contractTotal > 0 ? ($grossProfit / $contractTotal) * 100 : 0;
+
+        StatProjectMonthly::updateOrCreate(
+            [
+                'tenant_id' => $tenantId,
+                'stat_year' => $year,
+                'stat_month' => $month,
+            ],
+            [
+                'active_site_count' => $activeSites,
+                'completed_site_count' => $completedSites,
+                'new_contract_count' => $contractStats->new_count ?? 0,
+                'contract_total_amount' => $contractTotal,
+                'expected_expense_total' => $expenseStats->expected_total ?? 0,
+                'actual_expense_total' => $actualExpense,
+                'labor_cost_total' => 0,
+                'material_cost_total' => 0,
+                'gross_profit' => $grossProfit,
+                'gross_profit_rate' => $grossProfitRate,
+                'handover_report_count' => 0,
+                'structure_review_count' => 0,
+            ]
+        );
+
+        return 1;
+    }
+}
diff --git a/app/Services/Stats/StatAggregatorService.php b/app/Services/Stats/StatAggregatorService.php
index 6dcc191..7ca5515 100644
--- a/app/Services/Stats/StatAggregatorService.php
+++ b/app/Services/Stats/StatAggregatorService.php
@@ -21,6 +21,7 @@ private function getDailyDomainServices(): array
             'inventory' => InventoryStatService::class,
             'quote' => QuoteStatService::class,
             'hr' => HrStatService::class,
+            'system' => SystemStatService::class,
         ];
     }
 
@@ -36,6 +37,7 @@ private function getMonthlyDomainServices(): array
             'inventory' => InventoryStatService::class,
             'quote' => QuoteStatService::class,
             'hr' => HrStatService::class,
+            'project' => ProjectStatService::class,
         ];
     }
 
diff --git a/app/Services/Stats/StatEventService.php b/app/Services/Stats/StatEventService.php
new file mode 100644
index 0000000..83bda74
--- /dev/null
+++ b/app/Services/Stats/StatEventService.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Services\Stats;
+
+use App\Models\Stats\StatEvent;
+use App\Models\Stats\StatSnapshot;
+use Illuminate\Support\Facades\Log;
+
+class StatEventService
+{
+    /**
+     * 통계 이벤트 기록
+     */
+    public function recordEvent(
+        int $tenantId,
+        string $domain,
+        string $eventType,
+        string $entityType,
+        int $entityId,
+        ?array $payload = null
+    ): void {
+        try {
+            StatEvent::create([
+                'tenant_id' => $tenantId,
+                'domain' => $domain,
+                'event_type' => $eventType,
+                'entity_type' => $entityType,
+                'entity_id' => $entityId,
+                'payload' => $payload,
+                'occurred_at' => now(),
+            ]);
+        } catch (\Throwable $e) {
+            Log::warning('stat_event 기록 실패', [
+                'tenant_id' => $tenantId,
+                'domain' => $domain,
+                'event_type' => $eventType,
+                'error' => $e->getMessage(),
+            ]);
+        }
+    }
+
+    /**
+     * 스냅샷 저장
+     */
+    public function saveSnapshot(
+        int $tenantId,
+        string $domain,
+        string $snapshotDate,
+        array $data,
+        string $snapshotType = 'daily'
+    ): void {
+        try {
+            StatSnapshot::updateOrCreate(
+                [
+                    'tenant_id' => $tenantId,
+                    'snapshot_date' => $snapshotDate,
+                    'domain' => $domain,
+                    'snapshot_type' => $snapshotType,
+                ],
+                [
+                    'data' => $data,
+                    'created_at' => now(),
+                ]
+            );
+        } catch (\Throwable $e) {
+            Log::warning('stat_snapshot 저장 실패', [
+                'tenant_id' => $tenantId,
+                'domain' => $domain,
+                'snapshot_date' => $snapshotDate,
+                'error' => $e->getMessage(),
+            ]);
+        }
+    }
+}
diff --git a/app/Services/Stats/StatQueryService.php b/app/Services/Stats/StatQueryService.php
new file mode 100644
index 0000000..8b8a538
--- /dev/null
+++ b/app/Services/Stats/StatQueryService.php
@@ -0,0 +1,179 @@
+<?php
+
+namespace App\Services\Stats;
+
+use App\Models\Stats\Daily\StatFinanceDaily;
+use App\Models\Stats\Daily\StatHrAttendanceDaily;
+use App\Models\Stats\Daily\StatInventoryDaily;
+use App\Models\Stats\Daily\StatProductionDaily;
+use App\Models\Stats\Daily\StatQuotePipelineDaily;
+use App\Models\Stats\Daily\StatSalesDaily;
+use App\Models\Stats\Daily\StatSystemDaily;
+use App\Models\Stats\Monthly\StatFinanceMonthly;
+use App\Models\Stats\Monthly\StatProductionMonthly;
+use App\Models\Stats\Monthly\StatProjectMonthly;
+use App\Models\Stats\Monthly\StatSalesMonthly;
+use App\Models\Stats\StatAlert;
+use App\Services\Service;
+use Carbon\Carbon;
+
+class StatQueryService extends Service
+{
+    /**
+     * 도메인별 일간 통계 조회
+     */
+    public function getDailyStat(string $domain, array $params): array
+    {
+        $tenantId = $this->tenantId();
+        $startDate = $params['start_date'];
+        $endDate = $params['end_date'];
+
+        $model = $this->getDailyModel($domain);
+        if (! $model) {
+            return [];
+        }
+
+        return $model::where('tenant_id', $tenantId)
+            ->whereBetween('stat_date', [$startDate, $endDate])
+            ->orderBy('stat_date')
+            ->get()
+            ->toArray();
+    }
+
+    /**
+     * 도메인별 월간 통계 조회
+     */
+    public function getMonthlyStat(string $domain, array $params): array
+    {
+        $tenantId = $this->tenantId();
+        $year = (int) $params['year'];
+        $month = isset($params['month']) ? (int) $params['month'] : null;
+
+        $model = $this->getMonthlyModel($domain);
+        if (! $model) {
+            return [];
+        }
+
+        $query = $model::where('tenant_id', $tenantId)
+            ->where('stat_year', $year);
+
+        if ($month) {
+            $query->where('stat_month', $month);
+        }
+
+        return $query->orderBy('stat_month')
+            ->get()
+            ->toArray();
+    }
+
+    /**
+     * 대시보드 요약 통계 (sam_stat 기반)
+     */
+    public function getDashboardSummary(): array
+    {
+        $tenantId = $this->tenantId();
+        $today = Carbon::today()->format('Y-m-d');
+        $year = Carbon::now()->year;
+        $month = Carbon::now()->month;
+
+        return [
+            'sales_today' => $this->getTodaySales($tenantId, $today),
+            'finance_today' => $this->getTodayFinance($tenantId, $today),
+            'production_today' => $this->getTodayProduction($tenantId, $today),
+            'sales_monthly' => $this->getMonthlySalesOverview($tenantId, $year, $month),
+            'alerts' => $this->getActiveAlerts($tenantId),
+        ];
+    }
+
+    /**
+     * 알림 목록 조회
+     */
+    public function getAlerts(array $params): array
+    {
+        $tenantId = $this->tenantId();
+        $limit = $params['limit'] ?? 20;
+        $unreadOnly = $params['unread_only'] ?? false;
+
+        $query = StatAlert::where('tenant_id', $tenantId)
+            ->orderByDesc('created_at');
+
+        if ($unreadOnly) {
+            $query->where('is_read', false);
+        }
+
+        return $query->limit($limit)->get()->toArray();
+    }
+
+    private function getTodaySales(int $tenantId, string $today): ?array
+    {
+        $stat = StatSalesDaily::where('tenant_id', $tenantId)
+            ->where('stat_date', $today)
+            ->first();
+
+        return $stat?->toArray();
+    }
+
+    private function getTodayFinance(int $tenantId, string $today): ?array
+    {
+        $stat = StatFinanceDaily::where('tenant_id', $tenantId)
+            ->where('stat_date', $today)
+            ->first();
+
+        return $stat?->toArray();
+    }
+
+    private function getTodayProduction(int $tenantId, string $today): ?array
+    {
+        $stat = StatProductionDaily::where('tenant_id', $tenantId)
+            ->where('stat_date', $today)
+            ->first();
+
+        return $stat?->toArray();
+    }
+
+    private function getMonthlySalesOverview(int $tenantId, int $year, int $month): ?array
+    {
+        $stat = StatSalesMonthly::where('tenant_id', $tenantId)
+            ->where('stat_year', $year)
+            ->where('stat_month', $month)
+            ->first();
+
+        return $stat?->toArray();
+    }
+
+    private function getActiveAlerts(int $tenantId): array
+    {
+        return StatAlert::where('tenant_id', $tenantId)
+            ->where('is_read', false)
+            ->where('is_resolved', false)
+            ->orderByDesc('created_at')
+            ->limit(10)
+            ->get()
+            ->toArray();
+    }
+
+    private function getDailyModel(string $domain): ?string
+    {
+        return match ($domain) {
+            'sales' => StatSalesDaily::class,
+            'finance' => StatFinanceDaily::class,
+            'production' => StatProductionDaily::class,
+            'inventory' => StatInventoryDaily::class,
+            'quote' => StatQuotePipelineDaily::class,
+            'hr' => StatHrAttendanceDaily::class,
+            'system' => StatSystemDaily::class,
+            default => null,
+        };
+    }
+
+    private function getMonthlyModel(string $domain): ?string
+    {
+        return match ($domain) {
+            'sales' => StatSalesMonthly::class,
+            'finance' => StatFinanceMonthly::class,
+            'production' => StatProductionMonthly::class,
+            'project' => StatProjectMonthly::class,
+            default => null,
+        };
+    }
+}
diff --git a/app/Services/Stats/SystemStatService.php b/app/Services/Stats/SystemStatService.php
new file mode 100644
index 0000000..c4310ad
--- /dev/null
+++ b/app/Services/Stats/SystemStatService.php
@@ -0,0 +1,135 @@
+<?php
+
+namespace App\Services\Stats;
+
+use App\Models\Stats\Daily\StatSystemDaily;
+use Carbon\Carbon;
+use Illuminate\Support\Facades\DB;
+
+class SystemStatService implements StatDomainServiceInterface
+{
+    public function aggregateDaily(int $tenantId, Carbon $date): int
+    {
+        $dateStr = $date->format('Y-m-d');
+
+        // API 사용량
+        $apiStats = DB::connection('mysql')
+            ->table('api_request_logs')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('created_at', $dateStr)
+            ->selectRaw('
+                COUNT(*) as request_count,
+                SUM(CASE WHEN response_status >= 400 THEN 1 ELSE 0 END) as error_count,
+                COALESCE(AVG(duration_ms), 0) as avg_response_ms
+            ')
+            ->first();
+
+        // 사용자 활동 (고유 사용자 수, 로그인 수)
+        $activeUsers = DB::connection('mysql')
+            ->table('api_request_logs')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('created_at', $dateStr)
+            ->whereNotNull('user_id')
+            ->distinct('user_id')
+            ->count('user_id');
+
+        // personal_access_tokens에 tenant_id 없으므로 user_tenants 조인으로 로그인 수 집계
+        $loginCount = DB::connection('mysql')
+            ->table('personal_access_tokens as pat')
+            ->join('user_tenants as ut', function ($join) use ($tenantId) {
+                $join->on('pat.tokenable_id', '=', 'ut.user_id')
+                    ->where('pat.tokenable_type', '=', 'App\\Models\\Members\\User')
+                    ->where('ut.tenant_id', '=', $tenantId);
+            })
+            ->whereDate('pat.created_at', $dateStr)
+            ->count();
+
+        // 감사 로그
+        $auditStats = DB::connection('mysql')
+            ->table('audit_logs')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('created_at', $dateStr)
+            ->selectRaw("
+                SUM(CASE WHEN action = 'created' THEN 1 ELSE 0 END) as create_count,
+                SUM(CASE WHEN action = 'updated' THEN 1 ELSE 0 END) as update_count,
+                SUM(CASE WHEN action = 'deleted' THEN 1 ELSE 0 END) as delete_count
+            ")
+            ->first();
+
+        // FCM 알림
+        $fcmStats = DB::connection('mysql')
+            ->table('fcm_send_logs')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('created_at', $dateStr)
+            ->selectRaw('
+                COALESCE(SUM(success_count), 0) as sent_count,
+                COALESCE(SUM(failure_count), 0) as failed_count
+            ')
+            ->first();
+
+        // 파일 업로드
+        $fileStats = DB::connection('mysql')
+            ->table('files')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('created_at', $dateStr)
+            ->selectRaw('
+                COUNT(*) as upload_count,
+                COALESCE(SUM(file_size), 0) / 1048576 as upload_size_mb
+            ')
+            ->first();
+
+        // 결재
+        $approvalSubmitted = DB::connection('mysql')
+            ->table('approvals')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('drafted_at', $dateStr)
+            ->whereNull('deleted_at')
+            ->count();
+
+        $approvalCompleted = DB::connection('mysql')
+            ->table('approvals')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('completed_at', $dateStr)
+            ->whereNull('deleted_at')
+            ->count();
+
+        $approvalAvgHours = DB::connection('mysql')
+            ->table('approvals')
+            ->where('tenant_id', $tenantId)
+            ->whereDate('completed_at', $dateStr)
+            ->whereNotNull('drafted_at')
+            ->whereNotNull('completed_at')
+            ->whereNull('deleted_at')
+            ->selectRaw('AVG(TIMESTAMPDIFF(HOUR, drafted_at, completed_at)) as avg_hours')
+            ->value('avg_hours');
+
+        StatSystemDaily::updateOrCreate(
+            ['tenant_id' => $tenantId, 'stat_date' => $dateStr],
+            [
+                'api_request_count' => $apiStats->request_count ?? 0,
+                'api_error_count' => $apiStats->error_count ?? 0,
+                'api_avg_response_ms' => (int) ($apiStats->avg_response_ms ?? 0),
+                'active_user_count' => $activeUsers,
+                'login_count' => $loginCount,
+                'audit_create_count' => $auditStats->create_count ?? 0,
+                'audit_update_count' => $auditStats->update_count ?? 0,
+                'audit_delete_count' => $auditStats->delete_count ?? 0,
+                'fcm_sent_count' => $fcmStats->sent_count ?? 0,
+                'fcm_failed_count' => $fcmStats->failed_count ?? 0,
+                'file_upload_count' => $fileStats->upload_count ?? 0,
+                'file_upload_size_mb' => $fileStats->upload_size_mb ?? 0,
+                'approval_submitted_count' => $approvalSubmitted,
+                'approval_completed_count' => $approvalCompleted,
+                'approval_avg_hours' => (float) ($approvalAvgHours ?? 0),
+            ]
+        );
+
+        return 1;
+    }
+
+    public function aggregateMonthly(int $tenantId, int $year, int $month): int
+    {
+        // 시스템 도메인은 일간 테이블만 운영
+        return 0;
+    }
+}
diff --git a/database/migrations/stats/2026_01_29_200001_create_stat_project_monthly_table.php b/database/migrations/stats/2026_01_29_200001_create_stat_project_monthly_table.php
new file mode 100644
index 0000000..076a771
--- /dev/null
+++ b/database/migrations/stats/2026_01_29_200001_create_stat_project_monthly_table.php
@@ -0,0 +1,50 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    protected $connection = 'sam_stat';
+
+    public function up(): void
+    {
+        Schema::connection('sam_stat')->create('stat_project_monthly', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id');
+            $table->smallInteger('stat_year');
+            $table->tinyInteger('stat_month');
+
+            // 프로젝트 현황
+            $table->unsignedInteger('active_site_count')->default(0);
+            $table->unsignedInteger('completed_site_count')->default(0);
+            $table->unsignedInteger('new_contract_count')->default(0);
+            $table->decimal('contract_total_amount', 18, 2)->default(0);
+
+            // 원가
+            $table->decimal('expected_expense_total', 18, 2)->default(0);
+            $table->decimal('actual_expense_total', 18, 2)->default(0);
+            $table->decimal('labor_cost_total', 18, 2)->default(0);
+            $table->decimal('material_cost_total', 18, 2)->default(0);
+
+            // 수익률
+            $table->decimal('gross_profit', 18, 2)->default(0);
+            $table->decimal('gross_profit_rate', 5, 2)->default(0);
+
+            // 이슈
+            $table->unsignedInteger('handover_report_count')->default(0);
+            $table->unsignedInteger('structure_review_count')->default(0);
+
+            $table->timestamps();
+
+            $table->unique(['tenant_id', 'stat_year', 'stat_month'], 'uk_tenant_year_month');
+            $table->index(['stat_year', 'stat_month'], 'idx_year_month');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::connection('sam_stat')->dropIfExists('stat_project_monthly');
+    }
+};
diff --git a/database/migrations/stats/2026_01_29_200002_create_stat_system_daily_table.php b/database/migrations/stats/2026_01_29_200002_create_stat_system_daily_table.php
new file mode 100644
index 0000000..f39b143
--- /dev/null
+++ b/database/migrations/stats/2026_01_29_200002_create_stat_system_daily_table.php
@@ -0,0 +1,56 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    protected $connection = 'sam_stat';
+
+    public function up(): void
+    {
+        Schema::connection('sam_stat')->create('stat_system_daily', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id');
+            $table->date('stat_date');
+
+            // API 사용량
+            $table->unsignedInteger('api_request_count')->default(0);
+            $table->unsignedInteger('api_error_count')->default(0);
+            $table->unsignedInteger('api_avg_response_ms')->default(0);
+
+            // 사용자 활동
+            $table->unsignedInteger('active_user_count')->default(0);
+            $table->unsignedInteger('login_count')->default(0);
+
+            // 감사
+            $table->unsignedInteger('audit_create_count')->default(0);
+            $table->unsignedInteger('audit_update_count')->default(0);
+            $table->unsignedInteger('audit_delete_count')->default(0);
+
+            // 알림
+            $table->unsignedInteger('fcm_sent_count')->default(0);
+            $table->unsignedInteger('fcm_failed_count')->default(0);
+
+            // 파일
+            $table->unsignedInteger('file_upload_count')->default(0);
+            $table->decimal('file_upload_size_mb', 10, 2)->default(0);
+
+            // 결재
+            $table->unsignedInteger('approval_submitted_count')->default(0);
+            $table->unsignedInteger('approval_completed_count')->default(0);
+            $table->decimal('approval_avg_hours', 8, 2)->default(0);
+
+            $table->timestamps();
+
+            $table->unique(['tenant_id', 'stat_date'], 'uk_tenant_date');
+            $table->index('stat_date', 'idx_date');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::connection('sam_stat')->dropIfExists('stat_system_daily');
+    }
+};
diff --git a/database/migrations/stats/2026_01_29_200003_create_stat_events_table.php b/database/migrations/stats/2026_01_29_200003_create_stat_events_table.php
new file mode 100644
index 0000000..b52bb90
--- /dev/null
+++ b/database/migrations/stats/2026_01_29_200003_create_stat_events_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    protected $connection = 'sam_stat';
+
+    public function up(): void
+    {
+        Schema::connection('sam_stat')->create('stat_events', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id');
+            $table->string('domain', 50);
+            $table->string('event_type', 100);
+            $table->string('entity_type', 100);
+            $table->unsignedBigInteger('entity_id');
+            $table->json('payload')->nullable();
+            $table->timestamp('occurred_at');
+
+            $table->index(['tenant_id', 'domain'], 'idx_tenant_domain');
+            $table->index('occurred_at', 'idx_occurred');
+            $table->index(['entity_type', 'entity_id'], 'idx_entity');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::connection('sam_stat')->dropIfExists('stat_events');
+    }
+};
diff --git a/database/migrations/stats/2026_01_29_200004_create_stat_snapshots_table.php b/database/migrations/stats/2026_01_29_200004_create_stat_snapshots_table.php
new file mode 100644
index 0000000..2fa7f11
--- /dev/null
+++ b/database/migrations/stats/2026_01_29_200004_create_stat_snapshots_table.php
@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    protected $connection = 'sam_stat';
+
+    public function up(): void
+    {
+        Schema::connection('sam_stat')->create('stat_snapshots', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id');
+            $table->date('snapshot_date');
+            $table->string('domain', 50);
+            $table->string('snapshot_type', 50)->default('daily');
+            $table->json('data');
+            $table->timestamp('created_at')->nullable();
+
+            $table->unique(['tenant_id', 'snapshot_date', 'domain', 'snapshot_type'], 'uk_tenant_date_domain');
+            $table->index('snapshot_date', 'idx_date');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::connection('sam_stat')->dropIfExists('stat_snapshots');
+    }
+};
diff --git a/routes/api.php b/routes/api.php
index 44cd1b1..daf53ea 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -37,6 +37,7 @@
     require __DIR__.'/api/v1/boards.php';
     require __DIR__.'/api/v1/documents.php';
     require __DIR__.'/api/v1/common.php';
+    require __DIR__.'/api/v1/stats.php';
 
     // 공유 링크 다운로드 (인증 불필요 - auth.apikey 그룹 밖)
     Route::get('/files/share/{token}', [FileStorageController::class, 'downloadShared'])->name('v1.files.share.download');
diff --git a/routes/api/v1/stats.php b/routes/api/v1/stats.php
new file mode 100644
index 0000000..eef2469
--- /dev/null
+++ b/routes/api/v1/stats.php
@@ -0,0 +1,19 @@
+<?php
+
+/**
+ * 통계 API 라우트 (v1)
+ *
+ * - 대시보드 요약 (sam_stat 기반)
+ * - 도메인별 일간/월간 통계
+ * - 알림 목록
+ */
+
+use App\Http\Controllers\Api\V1\StatController;
+use Illuminate\Support\Facades\Route;
+
+Route::prefix('stats')->group(function () {
+    Route::get('/summary', [StatController::class, 'summary'])->name('v1.stats.summary');
+    Route::get('/daily', [StatController::class, 'daily'])->name('v1.stats.daily');
+    Route::get('/monthly', [StatController::class, 'monthly'])->name('v1.stats.monthly');
+    Route::get('/alerts', [StatController::class, 'alerts'])->name('v1.stats.alerts');
+});