fix: Backup schedules and pruning

backend/src/core/README.md

@@ -13,12 +13,12 @@ The `DistributedLockService` in `redis.ts` provides Redis-based distributed lock
 **All scheduled jobs MUST use distributed locking** to prevent duplicate execution when multiple backend containers are running.
 
 ```typescript
+import { randomUUID } from 'crypto';
 import { lockService } from '../core/config/redis';
-import { v4 as uuidv4 } from 'uuid';
 
 // Acquire lock (returns false if already held)
 const lockKey = 'job:my-scheduled-task';
-const lockValue = uuidv4();  // Unique identifier for this execution
+const lockValue = randomUUID();  // Unique identifier for this execution
 const ttlSeconds = 300;          // Auto-release after 5 minutes
 
 const acquired = await lockService.acquireLock(lockKey, ttlSeconds, lockValue);

backend/src/core/scheduler/README.md

@@ -22,13 +22,13 @@ The scheduler runs periodic background jobs. In blue-green deployments, **multip
 ### Pattern for New Jobs
 
 ```typescript
-import { v4 as uuidv4 } from 'uuid';
+import { randomUUID } from 'crypto';
 import { lockService } from '../../core/config/redis';
 import { logger } from '../../core/logging/logger';
 
 export async function processMyJob(): Promise<void> {
   const lockKey = 'job:my-job-name';
-  const lockValue = uuidv4();
+  const lockValue = randomUUID();
   const lockTtlSeconds = 300; // 5 minutes - adjust based on expected job duration
 
   // Try to acquire lock

backend/src/features/backup/jobs/backup-scheduled.job.ts

@@ -5,7 +5,7 @@
  */
 
 import { Pool } from 'pg';
-import { v4 as uuidv4 } from 'uuid';
+import { randomUUID } from 'crypto';
 import { logger } from '../../../core/logging/logger';
 import { lockService } from '../../../core/config/redis';
 import { BackupRepository } from '../data/backup.repository';
@@ -59,7 +59,7 @@ export async function processScheduledBackups(): Promise<ScheduledBackupJobResul
     for (const schedule of dueSchedules) {
       // Generate unique lock value for this execution
       const lockKey = `backup:schedule:${schedule.id}`;
-      const lockValue = uuidv4();
+      const lockValue = randomUUID();
 
       // Try to acquire lock for this schedule
       const lockAcquired = await lockService.acquireLock(lockKey, BACKUP_LOCK_TTL_SECONDS, lockValue);