Add POSTGRES_ACTIVE flag

main.py

@@ -17,6 +17,7 @@ POSTGRES_DB = os.getenv("POSTGRES_DB")
 POSTGRES_PASS = os.getenv("POSTGRES_PASS")
 POSTGRES_HOST = os.getenv("POSTGRES_HOST")
 POSTGRES_PORT = os.getenv("POSTGRES_PORT")
+POSTGRES_ACTIVE = os.getenv("POSTGRES_ACTIVE", "false").lower() == "true"
 
 NEO_ACTIVE = os.getenv("NEO_ACTIVE", "false").lower() == "true"
 NEO_USER = os.getenv("NEO_USER")
@@ -219,11 +220,11 @@ def load_users():
 
 
 class MainWindow(QMainWindow):
-    def __init__(self):
+    def __init__(self, postgres_active):
         super().__init__()
 
         self.setMinimumSize(QSize(640, 480))
-        self.setWindowTitle("postgres")
+        self.setWindowTitle("postgres" if postgres_active else "postgres (disabled)")
 
         central_widget = QWidget(self)
         self.setCentralWidget(central_widget)
@@ -319,10 +320,15 @@ class DataWindow(QWidget):
 
 
 if __name__ == "__main__":
-    users = load_users()
+    users = []
+    if POSTGRES_ACTIVE:
+        try:
+            users = load_users()
+        except Exception as error:
+            print(f"PostgreSQL load failed: {error}")
 
     app = QApplication(sys.argv)
-    main_window = MainWindow()
+    main_window = MainWindow(POSTGRES_ACTIVE)
     main_window.load_data(users)
     main_window.show()