feat(cc-050): add AiRequests controller (list + costs)

src/ai-requests/ai-requests.controller.ts

@@ -0,0 +1,75 @@
+import { Controller, Get, Query } from '@nestjs/common';
+import { desc, eq, sum, count } from 'drizzle-orm';
+import { CurrentSession } from '../auth/session.decorator';
+import type { AuthenticatedSession } from '../auth/tenant.guard';
+import { db } from '../db/client';
+import { aiRequests } from '../db/schema';
+
+@Controller('ai-requests')
+export class AiRequestsController {
+  @Get()
+  async list(
+    @CurrentSession() session: AuthenticatedSession,
+    @Query('limit') limitStr?: string,
+  ) {
+    const limit = Math.min(Math.max(1, parseInt(limitStr ?? '200', 10) || 200), 500);
+    return db.query.aiRequests.findMany({
+      where: eq(aiRequests.tenantId, session.tenantId),
+      orderBy: desc(aiRequests.createdAt),
+      limit,
+      columns: {
+        contextManifest: false,
+      },
+    });
+  }
+
+  @Get('costs')
+  async costs(@CurrentSession() session: AuthenticatedSession) {
+    const [totals] = await db
+      .select({
+        totalCostUsd: sum(aiRequests.costUsd),
+        totalRequests: count(),
+      })
+      .from(aiRequests)
+      .where(eq(aiRequests.tenantId, session.tenantId));
+
+    const byModel = await db
+      .select({
+        model: aiRequests.model,
+        requests: count(),
+        costUsd: sum(aiRequests.costUsd),
+      })
+      .from(aiRequests)
+      .where(eq(aiRequests.tenantId, session.tenantId))
+      .groupBy(aiRequests.model);
+
+    const byPurpose = await db
+      .select({
+        purpose: aiRequests.purpose,
+        requests: count(),
+        costUsd: sum(aiRequests.costUsd),
+      })
+      .from(aiRequests)
+      .where(eq(aiRequests.tenantId, session.tenantId))
+      .groupBy(aiRequests.purpose);
+
+    const byStatus = await db
+      .select({
+        resultStatus: aiRequests.resultStatus,
+        requests: count(),
+      })
+      .from(aiRequests)
+      .where(eq(aiRequests.tenantId, session.tenantId))
+      .groupBy(aiRequests.resultStatus);
+
+    return {
+      totals: {
+        totalCostUsd: totals?.totalCostUsd ?? '0',
+        totalRequests: totals?.totalRequests ?? 0,
+      },
+      byModel,
+      byPurpose,
+      byStatus,
+    };
+  }
+}