feat(billing): cap each owner's stored file volume

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/conversations/conversations.controller.ts

@@ -4,6 +4,7 @@ import { CurrentUser } from '../auth/current-user.decorator';
 import { RequireOrgModule } from '../billing/org-module.decorator';
 import { OrgModuleGuard } from '../billing/org-module.guard';
 import {
+  ConversationFileBytesDto,
   CreateConversationDmDto,
   CreateConversationGroupDto,
   CreateConversationChannelDto,
@@ -19,12 +20,34 @@ import {
   ToggleMessageReactionDto,
 } from './dto';
 import { ConversationsService } from './conversations.service';
+import { StorageQuotaService } from '../billing/storage-quota.service';
 
 @Controller('conversations')
 @UseGuards(JwtAuthGuard, OrgModuleGuard)
 @RequireOrgModule('conversations')
 export class ConversationsController {
-  constructor(private readonly conversations: ConversationsService) {}
+  constructor(
+    private readonly conversations: ConversationsService,
+    private readonly storage: StorageQuotaService,
+  ) {}
+
+  @Post('files/reserve')
+  reserveFile(
+    @CurrentUser() user: { organizationId: string },
+    @Body() dto: ConversationFileBytesDto,
+  ) {
+    return this.storage.assertCanAdd(user.organizationId, dto.bytes).then(() =>
+      this.storage.usageForOrganization(user.organizationId),
+    );
+  }
+
+  @Post('files/commit')
+  commitFile(
+    @CurrentUser() user: { organizationId: string },
+    @Body() dto: ConversationFileBytesDto,
+  ) {
+    return this.storage.addChat(user.organizationId, dto.bytes);
+  }
 
   @Get('access')
   access(@CurrentUser() user: { userId: string; organizationId: string; role: string }) {