Add container weight tracking for weigh-based concentrate audits

Record the total weight of a jar (product + container) at acquisition so
audits can be done by simply re-weighing the sealed jar. The tare is
derived (containerWeight − productWeight), and the audit flow offers a
"Weigh container" toggle that auto-calculates remaining product from the
scale reading.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/db.ts

@@ -14,6 +14,7 @@ db.pragma("foreign_keys = ON");
 archiveLegacyIfPresent();
 archiveV1IfPresent();
 migrateAddCheckoutDate();
+migrateAddContainerWeight();
 
 const schema = readFileSync(join(__dirname, "schema.sql"), "utf8");
 db.exec(schema);
@@ -26,6 +27,14 @@ function migrateAddCheckoutDate(): void {
   db.exec(`ALTER TABLE inventory_items ADD COLUMN checkout_date TEXT`);
 }
 
+function migrateAddContainerWeight(): void {
+  const cols = db
+    .prepare(`PRAGMA table_info(inventory_items)`)
+    .all() as { name: string }[];
+  if (cols.length === 0 || cols.some((c) => c.name === "container_weight")) return;
+  db.exec(`ALTER TABLE inventory_items ADD COLUMN container_weight REAL`);
+}
+
 // One-shot migration: the original schema put per-instance fields (weight,
 // bin_id, etc.) directly on `products`. The split schema separates products
 // (catalog) from inventory_items (instance). When we detect the old shape,

server/src/routes/bootstrap.ts

@@ -24,6 +24,7 @@ type InventoryRow = {
   cbd: number;
   total_cannabinoids: number;
   weight: number;
+  container_weight: number | null;
   last_audit_weight: number | null;
   count_original: number;
   count_last_audit: number | null;
@@ -101,6 +102,7 @@ bootstrapRouter.get("/bootstrap", (_req, res) => {
     cbd: i.cbd,
     totalCannabinoids: i.total_cannabinoids,
     weight: i.weight,
+    containerWeight: i.container_weight,
     lastAuditWeight: i.last_audit_weight,
     countOriginal: i.count_original,
     countLastAudit: i.count_last_audit,

server/src/routes/inventory.ts

@@ -15,6 +15,7 @@ type CreateBody = {
   weight?: number;
   countOriginal?: number;
   unitWeight?: number;
+  containerWeight?: number | null;
   purchaseDate: string;
 };
 
@@ -53,14 +54,14 @@ inventoryRouter.post("/inventory", (req, res) => {
        id, asset_id, product_id,
        shop_id, bin_id,
        price, thc, cbd, total_cannabinoids,
-       weight, last_audit_weight,
+       weight, container_weight, last_audit_weight,
        count_original, count_last_audit, unit_weight,
        purchase_date, status
      ) VALUES (
        @id, @assetId, @productId,
        @shopId, @binId,
        @price, @thc, @cbd, @totalCannabinoids,
-       @weight, @lastAuditWeight,
+       @weight, @containerWeight, @lastAuditWeight,
        @countOriginal, @countLastAudit, @unitWeight,
        @purchaseDate, 'active'
      )`,
@@ -75,6 +76,7 @@ inventoryRouter.post("/inventory", (req, res) => {
     cbd: body.cbd ?? 0,
     totalCannabinoids: body.totalCannabinoids ?? 0,
     weight: isDiscrete ? 0 : body.weight ?? 0,
+    containerWeight: isDiscrete ? null : body.containerWeight ?? null,
     lastAuditWeight: isDiscrete ? null : body.weight ?? 0,
     countOriginal: isDiscrete ? body.countOriginal ?? 0 : 0,
     countLastAudit: isDiscrete ? body.countOriginal ?? 0 : null,
@@ -95,6 +97,7 @@ type UpdateBody = Partial<{
   cbd: number;
   totalCannabinoids: number;
   weight: number;
+  containerWeight: number | null;
   countOriginal: number;
   unitWeight: number;
   purchaseDate: string;
@@ -110,6 +113,7 @@ type ItemRow = {
   cbd: number;
   total_cannabinoids: number;
   weight: number;
+  container_weight: number | null;
   last_audit_weight: number | null;
   count_original: number;
   count_last_audit: number | null;
@@ -121,8 +125,8 @@ function doUpdate(id: string, body: UpdateBody): void {
   const existing = db
     .prepare<[string], ItemRow>(
       `SELECT id, shop_id, bin_id, product_id, price, thc, cbd,
-              total_cannabinoids, weight, last_audit_weight, count_original,
-              count_last_audit, unit_weight, purchase_date
+              total_cannabinoids, weight, container_weight, last_audit_weight,
+              count_original, count_last_audit, unit_weight, purchase_date
          FROM inventory_items WHERE id = ?`,
     )
     .get(id);
@@ -161,6 +165,12 @@ function doUpdate(id: string, body: UpdateBody): void {
     !isDiscrete && Number.isFinite(body.weight) && (body.weight as number) >= 0
       ? (body.weight as number)
       : existing.weight;
+  const nextContainerWeight =
+    body.containerWeight === undefined
+      ? existing.container_weight
+      : body.containerWeight != null && Number.isFinite(body.containerWeight)
+        ? body.containerWeight
+        : null;
   const nextCountOriginal =
     isDiscrete && Number.isFinite(body.countOriginal) && (body.countOriginal as number) >= 0
       ? Math.floor(body.countOriginal as number)
@@ -184,6 +194,7 @@ function doUpdate(id: string, body: UpdateBody): void {
        cbd = @cbd,
        total_cannabinoids = @totalCannabinoids,
        weight = @weight,
+       container_weight = @containerWeight,
        last_audit_weight = @lastAuditWeight,
        count_original = @countOriginal,
        count_last_audit = @countLastAudit,
@@ -199,6 +210,7 @@ function doUpdate(id: string, body: UpdateBody): void {
     cbd: nextCbd,
     totalCannabinoids: nextTotalCanna,
     weight: nextWeight,
+    containerWeight: nextContainerWeight,
     lastAuditWeight: nextLastAuditWeight,
     countOriginal: nextCountOriginal,
     countLastAudit: nextCountLastAudit,

server/src/schema.sql

@@ -64,6 +64,7 @@ CREATE TABLE IF NOT EXISTS inventory_items (
   cbd                 REAL DEFAULT 0,
   total_cannabinoids  REAL DEFAULT 0,
   weight              REAL DEFAULT 0,
+  container_weight    REAL,
   last_audit_weight   REAL,
   count_original      INTEGER DEFAULT 0,
   count_last_audit    INTEGER,