Lots of changes to support Alembic and external DB

backend/app/main.py

@@ -69,7 +69,29 @@ async def root():
 
 @app.get("/health")
 async def health_check():
-    return {"status": "healthy", "timestamp": "2024-01-01T00:00:00Z"}
+    """Health check endpoint with database connectivity verification"""
+    from datetime import datetime
+    from sqlalchemy import text
+    from app.db.session import SessionLocal
+    
+    health_status = {
+        "status": "healthy",
+        "timestamp": datetime.utcnow().isoformat() + "Z",
+        "version": "2.0.0"
+    }
+    
+    # Check database connectivity
+    try:
+        db = SessionLocal()
+        db.execute(text("SELECT 1"))
+        db.close()
+        health_status["database"] = "connected"
+    except Exception as e:
+        health_status["status"] = "unhealthy"
+        health_status["database"] = "disconnected"
+        health_status["error"] = str(e)
+    
+    return health_status
 
 # Include API router
 app.include_router(api_router, prefix=settings.api_v1_str)