Task: Address review feedback left on GitHub.
Repository: freestyle-sh/Adorable#24
File: src/app/api/organizations/[orgId]/grn/route.ts#L83
Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below.

Feedback:
Critical bug: Using bitwise AND operator (&) instead of Drizzle's `and()` function. This will cause a runtime error or incorrect query behavior.

Should be:
```typescript
import { eq, and } from "drizzle-orm";
// ...
.where(
  and(
    eq(stockBalanceTable.warehouseId, warehouseId),
    eq(stockBalanceTable.productId, item.productId)
  )
)

</details>

Task: Address review feedback left on GitHub.
Repository: freestyle-sh/Adorable#24
File: src/lib/erp-utils.ts#L65
Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below.

Feedback:
Critical financial calculation error: The weighted average cost formula is mathematically incorrect. This calculates (previousCost + newCost) / totalQuantity, which treats costs as totals rather than per-unit costs.

Correct formula should be:
```typescript
return ((previousQuantity * previousCost) + (newQuantity * newCost)) / totalQuantity;

</details>

Task: Address review feedback left on GitHub.
Repository: freestyle-sh/Adorable#24
File: src/app/api/organizations/[orgId]/grn/route.ts#L66
Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below.

Feedback:
Missing database transaction: The entire GRN creation and stock update process (lines 66-118) should be wrapped in a database transaction to ensure atomicity. If any stock update fails, partial data will be left in an inconsistent state.

Recommended fix:
```typescript
await db.transaction(async (tx) => {
  // Move all insert/update operations here
  for (const item of items) {
    // ...
  }
});

</details>

Task: Address review feedback left on GitHub.
Repository: freestyle-sh/Adorable#24
File: src/app/api/organizations/[orgId]/journal-vouchers/route.ts#L65
Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below.

Feedback:
Missing database transaction: All journal entries, ledger entries, and account balance updates must be atomic. If any step fails after line 65, you'll have partial entries that corrupt the general ledger.

Wrap the entire operation in a transaction:
```typescript
await db.transaction(async (tx) => {
  // Move all operations here
});

</details>

Task: Address review feedback left on GitHub.
Repository: freestyle-sh/Adorable#24
File: src/app/api/organizations/[orgId]/journal-vouchers/route.ts#L84
Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below.

Feedback:
Account balance calculation error: This logic doesn't consider the account's normal balance type. In double-entry accounting:
- Debits increase: Assets, Expenses
- Credits increase: Liabilities, Equity, Revenue

The current formula (balance + debit - credit) only works for asset accounts. Should retrieve account type and apply appropriate logic, otherwise financial statements will be incorrect.

Task: Address review feedback left on GitHub.
Repository: freestyle-sh/Adorable#24
File: src/app/api/organizations/[orgId]/journal-vouchers/route.ts#L44
Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below.

Feedback:
Missing double-entry validation: Before creating the journal voucher, verify that totalDebit equals totalCredit. Unbalanced entries violate fundamental accounting principles and will corrupt financial statements.

Add validation:
```typescript
if (parseFloat(totalDebit) !== parseFloat(totalCredit)) {
  return NextResponse.json(
    { error: "Journal entries must be balanced: debits must equal credits" },
    { status: 400 }
  );
}

</details>