Better integration of sqlite3 database

backend/app/main.py

@@ -1,21 +1,37 @@
+# app/main.py
+
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+
 from app.routers import address, contact, proposal, dewar, shipment
+from app.database import Base, engine, SessionLocal, load_sample_data
 
 app = FastAPI()
 
 # Apply CORS middleware
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],  # Enable CORS for all origins for now
+    allow_origins=["*"],  # Enable CORS for all origins
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
 )
 
-# Include your routers
+@app.on_event("startup")
+def on_startup():
+    # Drop and recreate database schema
+    Base.metadata.drop_all(bind=engine)
+    Base.metadata.create_all(bind=engine)
+
+    db = SessionLocal()
+    try:
+        load_sample_data(db)
+    finally:
+        db.close()
+
+# Include routers with correct configuration
 app.include_router(contact.router, prefix="/contacts", tags=["contacts"])
-app.include_router(address.router, prefix="/return_addresses", tags=["return_addresses"])
+app.include_router(address.router, prefix="/addresses", tags=["addresses"])
 app.include_router(proposal.router, prefix="/proposals", tags=["proposals"])
 app.include_router(dewar.router, prefix="/dewars", tags=["dewars"])
 app.include_router(shipment.router, prefix="/shipments", tags=["shipments"])