Add db & pydantic models + set up alembic

backend/app/crud/client.py

@@ -0,0 +1,15 @@
+"""
+The Client table
+"""
+from fastapi import APIRouter, HTTPException
+from sqlmodel import func, select
+from app.models import Client, Supplier, Product, Payment, Credit
+from typing import Any
+
+router = APIRouter(prefix="/client", tags=["items"])
+
+
+@router.get("/", response_model=Client)
+def read_clients(
+    session: SessionDep,
+)