restructure: move backend into backend/

backend/app/routers/customers.py

@@ -0,0 +1,47 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from .. import crud
+from ..database import get_db
+from ..models import Customer
+from ..pagination import Page, PageParams
+from ..schemas import CustomerCreate, CustomerOut, CustomerUpdate
+
+router = APIRouter(prefix="/customers", tags=["customers"])
+
+
+@router.get("", response_model=Page[CustomerOut])
+def list_customers(
+    page: PageParams = Depends(),
+    username: str | None = None,
+    mac_address: str | None = None,
+    status: str | None = None,
+    db: Session = Depends(get_db),
+):
+    filters = {"username": username, "mac_address": mac_address, "status": status}
+    total = crud.count_rows(db, Customer, filters)
+    rows = crud.list_rows(db, Customer, limit=page.limit, offset=page.offset, filters=filters,
+                          order_by=Customer.id.desc())
+    return Page(total=total, limit=page.limit, offset=page.offset, items=rows)
+
+
+@router.get("/{customer_id}", response_model=CustomerOut)
+def get_customer(customer_id: int, db: Session = Depends(get_db)):
+    return crud.get_row_or_404(db, Customer, customer_id)
+
+
+@router.post("", response_model=CustomerOut, status_code=201)
+def create_customer(payload: CustomerCreate, db: Session = Depends(get_db)):
+    return crud.create_row(db, Customer, payload.model_dump())
+
+
+@router.put("/{customer_id}", response_model=CustomerOut)
+def update_customer(customer_id: int, payload: CustomerUpdate, db: Session = Depends(get_db)):
+    obj = crud.get_row_or_404(db, Customer, customer_id)
+    return crud.update_row(db, obj, payload.model_dump(exclude_unset=True))
+
+
+@router.delete("/{customer_id}", status_code=204)
+def delete_customer(customer_id: int, db: Session = Depends(get_db)):
+    obj = crud.get_row_or_404(db, Customer, customer_id)
+    crud.delete_row(db, obj)