Per-unit pricing for discrete products

Pre-rolls, edibles, and vaporizers are sold and reasoned about per unit
("$10 each") rather than as a bag total. The Add and Edit forms now ask
for "Price per unit" when the kind is discrete, and the product drawer
displays the per-unit number with the total as a small subline. Bulk
products (flower, concentrate, tincture) still take and show a total.

The stored price column remains the total, so existing data, spend
totals, sort-by-price, and bin value calculations all keep working
unchanged. Conversion (pricePerUnit × countOriginal) happens at the
form boundary on save and the inverse on edit-modal load.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/components/modals/AddProductFlow.tsx

@@ -48,6 +48,8 @@ export function AddProductFlow({ data, onClose }: { data: Bootstrap; onClose: ()
 
   const cfg = TYPES.find((t) => t.id === form.type);
   const isDiscrete = cfg?.kind === "discrete";
+  // form.price is total for bulk, per-unit for discrete.
+  const totalPrice = isDiscrete ? form.price * form.countOriginal : form.price;
   const cpg = !isDiscrete && form.weight > 0 ? form.price / form.weight : 0;
 
   // Find an existing strain matching the current name + brand + type.
@@ -107,6 +109,7 @@ export function AddProductFlow({ data, onClose }: { data: Bootstrap; onClose: ()
         shopId,
         binId,
         kind: isDiscrete ? "discrete" : "bulk",
+        price: totalPrice,
       });
     },
     onSuccess: () => {
@@ -274,7 +277,7 @@ export function AddProductFlow({ data, onClose }: { data: Bootstrap; onClose: ()
                 />
               </Field>
             )}
-            <Field label="Price ($)">
+            <Field label={isDiscrete ? "Price per unit ($)" : "Price ($)"}>
               <Input
                 type="number"
                 step="0.01"
@@ -297,6 +300,15 @@ export function AddProductFlow({ data, onClose }: { data: Bootstrap; onClose: ()
               <span className="mono" style={{ color: "var(--ink-2)" }}>{fmt.money(cpg)}</span>
             </div>
           )}
+          {isDiscrete && form.price > 0 && form.countOriginal > 0 && (
+            <div style={{ marginTop: 12, fontSize: 12, color: "var(--ink-3)" }}>
+              Total:{" "}
+              <span className="mono" style={{ color: "var(--ink-2)" }}>{fmt.money(totalPrice)}</span>
+              <span style={{ marginLeft: 6 }}>
+                ({form.countOriginal} × {fmt.money(form.price)})
+              </span>
+            </div>
+          )}
 
           <div className="smallcaps" style={{ color: "var(--ink-3)", margin: "28px 0 16px" }}>Cannabinoid profile</div>
           <div style={{ display: "grid", gridTemplateColumns: "repeat(3, 1fr)", gap: 16 }}>

web/src/components/modals/EditProductFlow.tsx

@@ -22,6 +22,13 @@ export function EditProductFlow({
 }) {
   const qc = useQueryClient();
 
+  const isDiscrete = product.kind === "discrete";
+  // form.price is total for bulk, per-unit for discrete. Convert at I/O boundaries.
+  const initialPrice =
+    isDiscrete && product.countOriginal > 0
+      ? product.price / product.countOriginal
+      : product.price;
+
   const [form, setForm] = useState({
     name: product.name,
     brandId: product.brandId ?? NEW_BRAND,
@@ -30,7 +37,7 @@ export function EditProductFlow({
     weight: product.weight,
     countOriginal: product.countOriginal,
     unitWeight: product.unitWeight,
-    price: product.price,
+    price: initialPrice,
     thc: product.thc,
     cbd: product.cbd,
     totalCannabinoids: product.totalCannabinoids,
@@ -49,7 +56,7 @@ export function EditProductFlow({
     setForm((f) => ({ ...f, [k]: v }));
 
   const cfg = TYPES.find((t) => t.id === product.type);
-  const isDiscrete = product.kind === "discrete";
+  const totalPrice = isDiscrete ? form.price * form.countOriginal : form.price;
   const cpg = !isDiscrete && form.weight > 0 ? form.price / form.weight : 0;
 
   const save = useMutation({
@@ -86,7 +93,7 @@ export function EditProductFlow({
         weight: isDiscrete ? undefined : form.weight,
         countOriginal: isDiscrete ? form.countOriginal : undefined,
         unitWeight: isDiscrete ? form.unitWeight : undefined,
-        price: form.price,
+        price: totalPrice,
         thc: form.thc,
         cbd: form.cbd,
         totalCannabinoids: form.totalCannabinoids,
@@ -262,7 +269,7 @@ export function EditProductFlow({
                 />
               </Field>
             )}
-            <Field label="Price ($)">
+            <Field label={isDiscrete ? "Price per unit ($)" : "Price ($)"}>
               <Input
                 type="number"
                 step="0.01"
@@ -285,6 +292,15 @@ export function EditProductFlow({
               <span className="mono" style={{ color: "var(--ink-2)" }}>{fmt.money(cpg)}</span>
             </div>
           )}
+          {isDiscrete && form.price > 0 && form.countOriginal > 0 && (
+            <div style={{ marginTop: 12, fontSize: 12, color: "var(--ink-3)" }}>
+              Total:{" "}
+              <span className="mono" style={{ color: "var(--ink-2)" }}>{fmt.money(totalPrice)}</span>
+              <span style={{ marginLeft: 6 }}>
+                ({form.countOriginal} × {fmt.money(form.price)})
+              </span>
+            </div>
+          )}
 
           <div className="smallcaps" style={{ color: "var(--ink-3)", margin: "28px 0 16px" }}>Cannabinoid profile</div>
           <div style={{ display: "grid", gridTemplateColumns: "repeat(3, 1fr)", gap: 16 }}>