v1 first layer

main.py

@@ -0,0 +1,93 @@
+"""
+APEX Layer 1 — Application Entry Point
+
+Launches the PyQt5 application.
+
+Usage:
+    python main.py
+
+Requirements:
+    - Python 3.10+
+    - PyQt5 5.15+
+    - requests 2.31+
+    - pandas 2.0+ (optional, for data)
+    - python-dotenv 1.0+
+
+Installation:
+    pip install PyQt5 requests python-dotenv
+
+First run:
+    1. Ensure .env file exists with FRED_API_KEY set
+    2. Run: python main.py
+    3. App initializes database with schema
+    4. Auto-fetches rates from FRED if AUTO_FETCH_RATES_ON_STARTUP=true
+    5. Ready for manual CPI/PMI entry
+"""
+
+import sys
+import traceback
+from PyQt5.QtWidgets import QApplication, QMessageBox
+from PyQt5.QtCore import Qt
+import config
+from main_window import MainWindow
+
+
+def main():
+    """Application entry point."""
+    try:
+        # Check critical configuration
+        if not config.FRED_API_KEY:
+            print("[ERROR] FRED_API_KEY not configured in .env file")
+            print("Please:")
+            print("  1. Go to https://fred.stlouisfed.org")
+            print("  2. Register and get a free API key")
+            print("  3. Add to .env: FRED_API_KEY=your_key_here")
+            return 1
+        
+        if config.DEBUG:
+            print(f"[Main] {config.APP_TITLE}")
+            print(f"[Main] Debug: ON")
+            print(f"[Main] Database: {config.DB_PATH}")
+        
+        # Create QApplication
+        app = QApplication(sys.argv)
+        
+        # Set application-wide stylesheet (optional)
+        app.setStyle('Fusion')
+        
+        # Create and show main window
+        window = MainWindow()
+        window.show()
+        
+        # Run application
+        exit_code = app.exec_()
+        
+        if config.DEBUG:
+            print("[Main] Application closed normally")
+        
+        return exit_code
+        
+    except Exception as e:
+        # Show error dialog
+        print(f"[CRITICAL ERROR] {str(e)}")
+        traceback.print_exc()
+        
+        # Try to show Qt error dialog
+        try:
+            app = QApplication.instance()
+            if app is None:
+                app = QApplication(sys.argv)
+            
+            QMessageBox.critical(
+                None,
+                "Critical Error",
+                f"Application failed to start:\n\n{str(e)}\n\nCheck the console for details."
+            )
+        except:
+            pass
+        
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())