diff --git a/brewman/.flake8 b/brewman/.flake8
index 01ee7607..cbe41b29 100644
--- a/brewman/.flake8
+++ b/brewman/.flake8
@@ -1,4 +1,4 @@
 [flake8]
-ignore = E203
+ignore = E203, W503
 max-line-length = 120
 exclude = .git,__pycache__,__init__.py,.mypy_cache,.pytest_cache
diff --git a/brewman/brewman/routers/account.py b/brewman/brewman/routers/account.py
index f65fa3ae..8422042a 100644
--- a/brewman/brewman/routers/account.py
+++ b/brewman/brewman/routers/account.py
@@ -171,7 +171,7 @@ def balance(id_: uuid.UUID, date, db: Session) -> Decimal:
         bal = bal.where(Voucher.date <= date)
 
     bal = bal.where(Voucher.voucher_type != VoucherType.ISSUE).where(Journal.account_id == id_)
-    result: Decimal = db.execute(bal).scalar()
+    result: Decimal = db.execute(bal).scalar_one_or_none()
     return Decimal(0) if result is None else result
 
 
diff --git a/brewman/brewman/routers/issue_grid.py b/brewman/brewman/routers/issue_grid.py
index 2b7e23c1..bc9e9ad0 100644
--- a/brewman/brewman/routers/issue_grid.py
+++ b/brewman/brewman/routers/issue_grid.py
@@ -1,4 +1,5 @@
-from datetime import datetime
+from datetime import date, datetime
+from typing import List
 
 from fastapi import APIRouter, Security
 from sqlalchemy import select
@@ -8,29 +9,30 @@ from ..core.security import get_current_active_user as get_user
 from ..db.session import SessionFuture
 from ..models.voucher import Voucher
 from ..models.voucher_type import VoucherType
+from ..schemas.issue_grid_item import IssueGridItem
 from ..schemas.user import UserToken
 
 
 router = APIRouter()
 
 
-@router.get("/{date}")
+@router.get("/{date_}", response_model=List[IssueGridItem])
 def grid_date(
-    date: str,
+    date_: str,
     user: UserToken = Security(get_user, scopes=["issue"]),
-):
-    date = datetime.strptime(date, "%d-%b-%Y")
+) -> List[IssueGridItem]:
+    date_obj = datetime.strptime(date_, "%d-%b-%Y")
     with SessionFuture() as db:
-        return get_grid(date, db)
+        return get_grid(date_obj, db)
 
 
-def get_grid(date, db: Session):
-    list_ = []
+def get_grid(date_: date, db: Session) -> List[IssueGridItem]:
+    list_: List[IssueGridItem] = []
     query = (
         db.execute(
             select(Voucher)
             .join(Voucher.journals)
-            .where(Voucher.date == date, Voucher.voucher_type == VoucherType.ISSUE)
+            .where(Voucher.date == date_, Voucher.voucher_type == VoucherType.ISSUE)
             .order_by(Voucher.creation_date)
         )
         .unique()
@@ -41,11 +43,11 @@ def get_grid(date, db: Session):
     for voucher in query:
         amount = voucher.journals[0].amount
         list_.append(
-            {
-                "id": str(voucher.id),
-                "amount": amount,
-                "source": [j.cost_centre.name for j in voucher.journals if j.debit == -1],
-                "destination": [j.cost_centre.name for j in voucher.journals if j.debit == 1],
-            }
+            IssueGridItem(
+                id=str(voucher.id),
+                amount=amount,
+                source=next(j.cost_centre.name for j in voucher.journals if j.debit == -1),
+                destination=next(j.cost_centre.name for j in voucher.journals if j.debit == 1),
+            )
         )
     return list_
diff --git a/brewman/brewman/schemas/issue_grid_item.py b/brewman/brewman/schemas/issue_grid_item.py
new file mode 100644
index 00000000..d52c67fd
--- /dev/null
+++ b/brewman/brewman/schemas/issue_grid_item.py
@@ -0,0 +1,15 @@
+import uuid
+
+from decimal import Decimal
+
+from pydantic import BaseModel
+
+
+class IssueGridItem(BaseModel):
+    id_: uuid.UUID
+    amount: Decimal
+    source: str
+    destination: str
+
+    class Config:
+        fields = {"id_": "id"}