Set up auto metric collection

Add Django Celery tasks and utilities to periodically collect system metrics (error rates, response times, queue sizes) and record them into metric_time_series. Include monitoring app scaffolding, metrics collector, Celery beat schedule, middleware for live metrics, and a Supabase edge function for cross-source metrics.

django/config/celery_beat_schedule.py

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+"""
+Celery Beat schedule configuration for periodic tasks.
+Import this in your Django settings.
+"""
+from celery.schedules import crontab
+
+CELERY_BEAT_SCHEDULE = {
+    # Collect all system metrics every minute
+    'collect-system-metrics': {
+        'task': 'monitoring.collect_system_metrics',
+        'schedule': 60.0,  # Every 60 seconds
+        'options': {'queue': 'monitoring'}
+    },
+    
+    # Collect error metrics every minute
+    'collect-error-metrics': {
+        'task': 'monitoring.collect_error_metrics',
+        'schedule': 60.0,
+        'options': {'queue': 'monitoring'}
+    },
+    
+    # Collect performance metrics every minute
+    'collect-performance-metrics': {
+        'task': 'monitoring.collect_performance_metrics',
+        'schedule': 60.0,
+        'options': {'queue': 'monitoring'}
+    },
+    
+    # Collect queue metrics every 30 seconds
+    'collect-queue-metrics': {
+        'task': 'monitoring.collect_queue_metrics',
+        'schedule': 30.0,
+        'options': {'queue': 'monitoring'}
+    },
+    
+    # Existing user tasks
+    'cleanup-expired-tokens': {
+        'task': 'users.cleanup_expired_tokens',
+        'schedule': crontab(hour='*/6', minute=0),  # Every 6 hours
+        'options': {'queue': 'maintenance'}
+    },
+    
+    'cleanup-inactive-users': {
+        'task': 'users.cleanup_inactive_users',
+        'schedule': crontab(hour=2, minute=0, day_of_week=1),  # Weekly on Monday at 2 AM
+        'options': {'queue': 'maintenance'}
+    },
+    
+    'update-user-statistics': {
+        'task': 'users.update_user_statistics',
+        'schedule': crontab(hour='*', minute=0),  # Every hour
+        'options': {'queue': 'analytics'}
+    },
+}