Refactor investor-related schemas and models; update database configuration and enhance investor processing logic

app/main.py

@@ -1,14 +1,15 @@
 import io
-from api import investors
+
 import pandas as pd
-from db.db import db_dependency
+from api import investors
+from db.db import db_dependency, init_database
 from fastapi import FastAPI, File, UploadFile
 from services.openrouter import InvestorProcessor
 from services.querying import QueryProcessor
 
 app = FastAPI()
 app.include_router(investors.router)
-# init_database()
+init_database()
 
 
 @app.get("/")