✨ feat(admin): add user data dashboard for cross-project data visualization

Add comprehensive admin dashboard to view and manage user data across all projects:

Backend:
- Add admin endpoints to Chat, Todo, Contacts, Calendar, Picture, Zitare, Presi
- Each backend exposes GET/DELETE /api/v1/admin/user-data/:userId
- Service-to-service auth via X-Service-Key header

Aggregation (mana-core-auth):
- GET /api/v1/admin/users - Paginated user list with search
- GET /api/v1/admin/users/:userId/data - Aggregated data from all backends
- DELETE /api/v1/admin/users/:userId/data - GDPR deletion across all projects

Frontend (ManaCore web):
- New User Data tab in admin navigation
- User search page at /admin/user-data
- User detail page with ProjectDataCard components
- GDPR deletion dialog with email confirmation

Presi:
- Migrate user_id from UUID to TEXT for Better Auth compatibility
- Add SQL migration script

apps/calendar/apps/backend/src/admin/admin.controller.ts

@@ -0,0 +1,34 @@
+import {
+	Controller,
+	Get,
+	Delete,
+	Param,
+	UseGuards,
+	Logger,
+	HttpCode,
+	HttpStatus,
+} from '@nestjs/common';
+import { AdminService } from './admin.service';
+import { ServiceAuthGuard } from './guards/service-auth.guard';
+import { UserDataResponse, DeleteUserDataResponse } from './dto/user-data-response.dto';
+
+@Controller('api/v1/admin')
+@UseGuards(ServiceAuthGuard)
+export class AdminController {
+	private readonly logger = new Logger(AdminController.name);
+
+	constructor(private readonly adminService: AdminService) {}
+
+	@Get('user-data/:userId')
+	async getUserData(@Param('userId') userId: string): Promise<UserDataResponse> {
+		this.logger.log(`Admin request: getUserData for userId=${userId}`);
+		return this.adminService.getUserData(userId);
+	}
+
+	@Delete('user-data/:userId')
+	@HttpCode(HttpStatus.OK)
+	async deleteUserData(@Param('userId') userId: string): Promise<DeleteUserDataResponse> {
+		this.logger.log(`Admin request: deleteUserData for userId=${userId}`);
+		return this.adminService.deleteUserData(userId);
+	}
+}

apps/calendar/apps/backend/src/admin/admin.module.ts

@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { AdminController } from './admin.controller';
+import { AdminService } from './admin.service';
+import { DatabaseModule } from '../db/database.module';
+
+@Module({
+	imports: [ConfigModule, DatabaseModule],
+	controllers: [AdminController],
+	providers: [AdminService],
+})
+export class AdminModule {}

apps/calendar/apps/backend/src/admin/admin.service.ts

@@ -0,0 +1,152 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { Inject } from '@nestjs/common';
+import { NodePgDatabase } from 'drizzle-orm/node-postgres';
+import { eq, sql, desc, inArray } from 'drizzle-orm';
+import * as schema from '../db/schema';
+import {
+	UserDataResponse,
+	DeleteUserDataResponse,
+	EntityCount,
+} from './dto/user-data-response.dto';
+
+@Injectable()
+export class AdminService {
+	private readonly logger = new Logger(AdminService.name);
+
+	constructor(
+		@Inject('DATABASE_CONNECTION')
+		private readonly db: NodePgDatabase<typeof schema>
+	) {}
+
+	async getUserData(userId: string): Promise<UserDataResponse> {
+		this.logger.log(`Getting user data for userId: ${userId}`);
+
+		// Count calendars
+		const calendarsResult = await this.db
+			.select({ count: sql<number>`count(*)::int` })
+			.from(schema.calendars)
+			.where(eq(schema.calendars.userId, userId));
+		const calendarsCount = calendarsResult[0]?.count ?? 0;
+
+		// Count events
+		const eventsResult = await this.db
+			.select({ count: sql<number>`count(*)::int` })
+			.from(schema.events)
+			.where(eq(schema.events.userId, userId));
+		const eventsCount = eventsResult[0]?.count ?? 0;
+
+		// Count reminders
+		const remindersResult = await this.db
+			.select({ count: sql<number>`count(*)::int` })
+			.from(schema.reminders)
+			.where(eq(schema.reminders.userId, userId));
+		const remindersCount = remindersResult[0]?.count ?? 0;
+
+		// Count calendar shares (invited by user)
+		const sharesResult = await this.db
+			.select({ count: sql<number>`count(*)::int` })
+			.from(schema.calendarShares)
+			.where(eq(schema.calendarShares.invitedBy, userId));
+		const sharesCount = sharesResult[0]?.count ?? 0;
+
+		// Count external calendars
+		const externalCalendarsResult = await this.db
+			.select({ count: sql<number>`count(*)::int` })
+			.from(schema.externalCalendars)
+			.where(eq(schema.externalCalendars.userId, userId));
+		const externalCalendarsCount = externalCalendarsResult[0]?.count ?? 0;
+
+		// Get last activity
+		const lastEvent = await this.db
+			.select({ updatedAt: schema.events.updatedAt })
+			.from(schema.events)
+			.where(eq(schema.events.userId, userId))
+			.orderBy(desc(schema.events.updatedAt))
+			.limit(1);
+		const lastActivityAt = lastEvent[0]?.updatedAt?.toISOString();
+
+		const entities: EntityCount[] = [
+			{ entity: 'calendars', count: calendarsCount, label: 'Calendars' },
+			{ entity: 'events', count: eventsCount, label: 'Events' },
+			{ entity: 'reminders', count: remindersCount, label: 'Reminders' },
+			{ entity: 'calendar_shares', count: sharesCount, label: 'Calendar Shares' },
+			{ entity: 'external_calendars', count: externalCalendarsCount, label: 'External Calendars' },
+		];
+
+		const totalCount =
+			calendarsCount + eventsCount + remindersCount + sharesCount + externalCalendarsCount;
+
+		return { entities, totalCount, lastActivityAt };
+	}
+
+	async deleteUserData(userId: string): Promise<DeleteUserDataResponse> {
+		this.logger.log(`Deleting user data for userId: ${userId}`);
+
+		const deletedCounts: EntityCount[] = [];
+		let totalDeleted = 0;
+
+		// Delete reminders
+		const deletedReminders = await this.db
+			.delete(schema.reminders)
+			.where(eq(schema.reminders.userId, userId))
+			.returning();
+		deletedCounts.push({ entity: 'reminders', count: deletedReminders.length, label: 'Reminders' });
+		totalDeleted += deletedReminders.length;
+
+		// Delete calendar shares (where user invited)
+		const deletedShares = await this.db
+			.delete(schema.calendarShares)
+			.where(eq(schema.calendarShares.invitedBy, userId))
+			.returning();
+		deletedCounts.push({
+			entity: 'calendar_shares',
+			count: deletedShares.length,
+			label: 'Calendar Shares',
+		});
+		totalDeleted += deletedShares.length;
+
+		// Delete events (cascades from calendars but also direct)
+		const deletedEvents = await this.db
+			.delete(schema.events)
+			.where(eq(schema.events.userId, userId))
+			.returning();
+		deletedCounts.push({ entity: 'events', count: deletedEvents.length, label: 'Events' });
+		totalDeleted += deletedEvents.length;
+
+		// Delete external calendars
+		const deletedExternalCalendars = await this.db
+			.delete(schema.externalCalendars)
+			.where(eq(schema.externalCalendars.userId, userId))
+			.returning();
+		deletedCounts.push({
+			entity: 'external_calendars',
+			count: deletedExternalCalendars.length,
+			label: 'External Calendars',
+		});
+		totalDeleted += deletedExternalCalendars.length;
+
+		// Delete calendars
+		const deletedCalendars = await this.db
+			.delete(schema.calendars)
+			.where(eq(schema.calendars.userId, userId))
+			.returning();
+		deletedCounts.push({ entity: 'calendars', count: deletedCalendars.length, label: 'Calendars' });
+		totalDeleted += deletedCalendars.length;
+
+		// Delete device tokens
+		const deletedDeviceTokens = await this.db
+			.delete(schema.deviceTokens)
+			.where(eq(schema.deviceTokens.userId, userId))
+			.returning();
+		deletedCounts.push({
+			entity: 'device_tokens',
+			count: deletedDeviceTokens.length,
+			label: 'Device Tokens',
+		});
+		totalDeleted += deletedDeviceTokens.length;
+
+		this.logger.log(`Deleted ${totalDeleted} records for userId: ${userId}`);
+
+		return { success: true, deletedCounts, totalDeleted };
+	}
+}

apps/calendar/apps/backend/src/admin/dto/user-data-response.dto.ts

@@ -0,0 +1,17 @@
+export interface EntityCount {
+	entity: string;
+	count: number;
+	label: string;
+}
+
+export interface UserDataResponse {
+	entities: EntityCount[];
+	totalCount: number;
+	lastActivityAt?: string;
+}
+
+export interface DeleteUserDataResponse {
+	success: boolean;
+	deletedCounts: EntityCount[];
+	totalDeleted: number;
+}

apps/calendar/apps/backend/src/admin/guards/service-auth.guard.ts

@@ -0,0 +1,36 @@
+import {
+	Injectable,
+	CanActivate,
+	ExecutionContext,
+	UnauthorizedException,
+	Logger,
+} from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { Request } from 'express';
+
+@Injectable()
+export class ServiceAuthGuard implements CanActivate {
+	private readonly logger = new Logger(ServiceAuthGuard.name);
+	private readonly serviceKey: string;
+
+	constructor(private readonly configService: ConfigService) {
+		this.serviceKey = this.configService.get<string>('ADMIN_SERVICE_KEY', 'dev-admin-key');
+	}
+
+	canActivate(context: ExecutionContext): boolean {
+		const request = context.switchToHttp().getRequest<Request>();
+		const providedKey = request.headers['x-service-key'] as string;
+
+		if (!providedKey) {
+			this.logger.warn('Missing X-Service-Key header');
+			throw new UnauthorizedException('Missing service key');
+		}
+
+		if (providedKey !== this.serviceKey) {
+			this.logger.warn('Invalid service key provided');
+			throw new UnauthorizedException('Invalid service key');
+		}
+
+		return true;
+	}
+}

apps/calendar/apps/backend/src/app.module.ts

@@ -15,6 +15,7 @@ import { SyncModule } from './sync/sync.module';
 import { NetworkModule } from './network/network.module';
 import { EmailModule } from './email/email.module';
 import { NotificationModule } from './notification/notification.module';
+import { AdminModule } from './admin/admin.module';
 
 @Module({
 	imports: [
@@ -48,6 +49,7 @@ import { NotificationModule } from './notification/notification.module';
 		ShareModule,
 		SyncModule,
 		NetworkModule,
+		AdminModule,
 	],
 })
 export class AppModule {}