04/06 adding some additional functions

app/__init__.py

@@ -144,14 +144,59 @@ def create_app(config_name=None):
         _seed_admin(app)
         _seed_settings()
 
+    # ── SLA background scheduler ──────────────────────────────────────────────
+    # APScheduler runs inside the gunicorn worker process (single-worker
+    # eventlet setup), so no cross-process coordination is needed.
+    # The scheduler is only started in the main process — not during Flask's
+    # reloader child process — to prevent duplicate job execution.
+    _start_sla_scheduler(app)
+
     return app
 
 
+def _start_sla_scheduler(app):
+    """Start the APScheduler background job that checks for SLA breaches.
+
+    Safe to call on every app startup: the scheduler is idempotent and
+    jobstore deduplication prevents double-registration on hot-reloads.
+    Under gunicorn with preload_app=False each worker calls create_app()
+    once, so there is exactly one scheduler per worker.
+    """
+    # Skip inside Flask's reloader subprocess (identified by the env var it sets).
+    import os as _os
+    if _os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
+        # Reloader is active — the child process will start its own scheduler.
+        return
+
+    try:
+        from apscheduler.schedulers.background import BackgroundScheduler
+        from apscheduler.triggers.interval import IntervalTrigger
+        from app.services.sla_service import check_sla_breaches
+
+        scheduler = BackgroundScheduler(daemon=True)
+        scheduler.add_job(
+            func     = check_sla_breaches,
+            trigger  = IntervalTrigger(minutes=30),
+            id       = 'sla_check',
+            name     = 'SLA Breach Check',
+            replace_existing = True,
+            args     = [app],
+        )
+        scheduler.start()
+        app.logger.info('[SLA] APScheduler started — SLA breach check every 30 minutes')
+    except Exception as exc:
+        app.logger.error(f'[SLA] Failed to start APScheduler: {exc}')
+
+
 def _seed_settings():
     """Ensure all required system settings exist with safe defaults."""
     from app.models import SystemSetting
     defaults = [
         ('registration_enabled', 'true',    'Allow new users to self-register via /auth/register'),
+        ('sla_critical_hours',   '4',       'Hours before a CRITICAL ticket is considered overdue'),
+        ('sla_high_hours',       '8',       'Hours before a HIGH ticket is considered overdue'),
+        ('sla_medium_hours',     '48',      'Hours before a MEDIUM ticket is considered overdue'),
+        ('sla_low_hours',        '120',     'Hours before a LOW ticket is considered overdue'),
         ('app_name',             'TechDesk', 'Application name shown in the sidebar and page titles'),
         ('app_subtitle',         'IT Helpdesk System', 'Subtitle shown below the app name in the sidebar'),
         ('company_name',         '',         'Company name shown on the login and register pages'),