feat: Implement background scheduler initialization to prevent race conditions in multi-worker deployments

gunicorn.conf.py

@@ -0,0 +1,42 @@
+"""
+Gunicorn configuration for Inventarsystem.
+
+This configuration ensures that:
+1. The BackgroundScheduler runs reliably in only one worker process
+2. Appointment status updates and reminders work correctly
+3. Multi-worker deployments don't cause race conditions
+"""
+
+import os
+import sys
+from pathlib import Path
+
+# Get project root
+PROJECT_ROOT = Path(__file__).parent
+
+# Basic configuration
+bind = "unix:/tmp/inventarsystem.sock"
+workers = 1  # CRITICAL: Only 1 worker to prevent BackgroundScheduler race conditions
+worker_class = "sync"
+timeout = 60
+graceful_timeout = 20
+max_requests = 1000
+max_requests_jitter = 100
+
+# Logging
+accesslog = str(PROJECT_ROOT / "logs" / "access.log")
+errorlog = str(PROJECT_ROOT / "logs" / "error.log")
+log_level = "info"
+capture_output = True
+
+# Worker initialization hook to ensure scheduler starts only once
+def on_starting(server):
+    """Called just before the master process is initialized."""
+    print("[GUNICORN] Starting Inventarsystem with scheduler support (1 worker only)")
+
+def when_ready(server):
+    """Called just after the server is started."""
+    print("[GUNICORN] Server is ready. Scheduler should be active in the single worker process.")
+
+# Ensure the logs directory exists
+os.makedirs(PROJECT_ROOT / "logs", exist_ok=True)