working with login and building inventory
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227
trade-hub/backend/app/inventory.py
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227
trade-hub/backend/app/inventory.py
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"""Per-user inventory routes.
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Rows reference immutable catalog items by `class_name`; responses are enriched
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live from the in-memory catalog. A missing catalog item is reported as
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`available: false` instead of deleting the user's data.
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"""
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import math
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from fastapi import APIRouter, Depends, HTTPException, Query, Response
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from sqlalchemy import select
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from sqlalchemy.exc import IntegrityError
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from sqlalchemy.orm import Session as DbSession
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from app import catalog
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from app.db import get_db
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from app.deps import get_current_user, require_same_origin
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from app.models import InventoryEntry, User
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from app.schemas import (
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InventoryAddRequest,
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InventoryAddResponse,
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InventoryEntryOut,
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InventoryPage,
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InventoryPatchRequest,
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InventorySummary,
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)
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router = APIRouter(
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prefix="/api/v1/me/inventory",
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tags=["inventory"],
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dependencies=[Depends(require_same_origin)],
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)
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MAX_PAGE_SIZE = 100
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def _enrich(entry: InventoryEntry) -> dict:
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item = catalog.store.by_class_name.get(entry.class_name)
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if item is None:
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return {
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"class_name": entry.class_name,
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"name": entry.class_name.replace("_", " "),
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"category": None,
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"type": None,
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"size": None,
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"grade": None,
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"manufacturer": None,
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"quantity": entry.quantity,
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"notes": entry.notes,
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"available": False,
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"created_at": entry.created_at,
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"updated_at": entry.updated_at,
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}
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return {
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"class_name": entry.class_name,
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"name": item["name"],
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"category": item["category"],
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"type": item["type"],
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"size": item["size"],
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"grade": item["grade"],
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"manufacturer": item["manufacturer"],
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"quantity": entry.quantity,
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"notes": entry.notes,
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"available": True,
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"created_at": entry.created_at,
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"updated_at": entry.updated_at,
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}
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def _find(db: DbSession, user: User, class_name: str) -> InventoryEntry | None:
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return db.execute(
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select(InventoryEntry).where(
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InventoryEntry.user_id == user.id,
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InventoryEntry.class_name == class_name,
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)
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).scalar_one_or_none()
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@router.get("", response_model=InventoryPage)
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def list_inventory(
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category: str | None = None,
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search: str | None = None,
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page: int = Query(default=1, ge=1),
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page_size: int = Query(default=25, ge=1),
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user: User = Depends(get_current_user),
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db: DbSession = Depends(get_db),
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):
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page_size = min(page_size, MAX_PAGE_SIZE)
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rows = db.execute(
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select(InventoryEntry).where(InventoryEntry.user_id == user.id)
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).scalars().all()
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items = [_enrich(row) for row in rows]
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if category is not None and category.strip():
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wanted = category.strip()
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items = [i for i in items if i["category"] == wanted]
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if search is not None and search.strip():
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needle = search.strip().lower()
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items = [
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i
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for i in items
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if needle in i["name"].lower() or needle in i["class_name"].lower()
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]
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items.sort(key=lambda i: (i["name"].lower(), i["class_name"]))
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total = len(items)
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total_pages = max(1, math.ceil(total / page_size))
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start = (page - 1) * page_size
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return {
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"total": total,
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"page": page,
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"page_size": page_size,
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"total_pages": total_pages,
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"items": items[start : start + page_size],
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}
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@router.get("/summary", response_model=InventorySummary)
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def inventory_summary(
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user: User = Depends(get_current_user), db: DbSession = Depends(get_db)
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):
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rows = db.execute(
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select(InventoryEntry).where(InventoryEntry.user_id == user.id)
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).scalars().all()
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categories: dict[str, int] = {}
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unavailable = 0
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total_quantity = 0
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for row in rows:
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item = catalog.store.by_class_name.get(row.class_name)
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if item is None:
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unavailable += 1
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else:
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key = item["category"]
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categories[key] = categories.get(key, 0) + row.quantity
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total_quantity += row.quantity
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return {
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"items": len(rows),
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"quantity": total_quantity,
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"categories": categories,
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"unavailable": unavailable,
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}
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@router.post("", response_model=InventoryAddResponse)
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def add_to_inventory(
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payload: InventoryAddRequest,
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response: Response,
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user: User = Depends(get_current_user),
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db: DbSession = Depends(get_db),
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):
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class_name = payload.class_name.strip()
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if class_name not in catalog.store.by_class_name:
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raise HTTPException(
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status_code=404, detail=f"Catalog item '{class_name}' not found"
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)
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entry = _find(db, user, class_name)
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created = entry is None
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if created:
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entry = InventoryEntry(
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user_id=user.id,
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class_name=class_name,
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quantity=payload.quantity,
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notes=payload.notes,
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)
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db.add(entry)
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else:
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entry.quantity += payload.quantity
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if payload.notes:
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entry.notes = payload.notes
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try:
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db.commit()
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except IntegrityError:
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# Lost a race against a concurrent add: re-read and increment instead.
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db.rollback()
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entry = _find(db, user, class_name)
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if entry is None:
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raise HTTPException(status_code=409, detail="Could not add item; retry")
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entry.quantity += payload.quantity
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if payload.notes:
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entry.notes = payload.notes
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db.commit()
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created = False
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db.refresh(entry)
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response.status_code = 201 if created else 200
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return {"entry": InventoryEntryOut.model_validate(_enrich(entry)), "created": created}
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@router.patch("/{class_name}", response_model=InventoryEntryOut)
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def update_inventory_entry(
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class_name: str,
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payload: InventoryPatchRequest,
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user: User = Depends(get_current_user),
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db: DbSession = Depends(get_db),
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):
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entry = _find(db, user, class_name)
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if entry is None:
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raise HTTPException(status_code=404, detail="Item is not in your inventory")
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if payload.quantity is not None:
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entry.quantity = payload.quantity
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if payload.notes is not None:
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entry.notes = payload.notes
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db.commit()
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db.refresh(entry)
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return InventoryEntryOut.model_validate(_enrich(entry))
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@router.delete("/{class_name}", status_code=204)
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def remove_inventory_entry(
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class_name: str,
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user: User = Depends(get_current_user),
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db: DbSession = Depends(get_db),
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):
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entry = _find(db, user, class_name)
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if entry is None:
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raise HTTPException(status_code=404, detail="Item is not in your inventory")
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db.delete(entry)
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db.commit()
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return Response(status_code=204)
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