Initial commit: NextGen PPR System

- FastAPI backend with JWT authentication
- MySQL database with full schema
- Docker Compose orchestration
- CSV data import for 43,208 airports and 519,999 aircraft
- Complete PPR management API
- Modernized replacement for PHP-based system

backend/app/main.py

@@ -0,0 +1,78 @@
+from fastapi import FastAPI, Depends, HTTPException, WebSocket, WebSocketDisconnect
+from fastapi.middleware.cors import CORSMiddleware
+from typing import List
+import json
+from app.core.config import settings
+from app.api.api import api_router
+
+app = FastAPI(
+    title=settings.project_name,
+    openapi_url=f"{settings.api_v1_str}/openapi.json",
+    description="Prior Permission Required (PPR) system API for aircraft operations management",
+    version="2.0.0"
+)
+
+# Set up CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # Configure this properly for production
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# WebSocket connection manager for real-time updates
+class ConnectionManager:
+    def __init__(self):
+        self.active_connections: List[WebSocket] = []
+
+    async def connect(self, websocket: WebSocket):
+        await websocket.accept()
+        self.active_connections.append(websocket)
+
+    def disconnect(self, websocket: WebSocket):
+        self.active_connections.remove(websocket)
+
+    async def send_personal_message(self, message: str, websocket: WebSocket):
+        await websocket.send_text(message)
+
+    async def broadcast(self, message: dict):
+        message_str = json.dumps(message)
+        for connection in self.active_connections:
+            try:
+                await connection.send_text(message_str)
+            except:
+                # Connection is dead, remove it
+                self.active_connections.remove(connection)
+
+manager = ConnectionManager()
+
+@app.websocket("/ws/tower-updates")
+async def websocket_endpoint(websocket: WebSocket):
+    await manager.connect(websocket)
+    try:
+        while True:
+            # Keep connection alive
+            data = await websocket.receive_text()
+            # Echo back for heartbeat
+            await websocket.send_text(f"Heartbeat: {data}")
+    except WebSocketDisconnect:
+        manager.disconnect(websocket)
+
+@app.get("/")
+async def root():
+    return {
+        "message": "Airfield PPR API", 
+        "version": "2.0.0",
+        "docs": "/docs"
+    }
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy", "timestamp": "2024-01-01T00:00:00Z"}
+
+# Include API router
+app.include_router(api_router, prefix=settings.api_v1_str)
+
+# Make connection manager available to the app
+app.state.connection_manager = manager