diff --git a/client/src/App.tsx b/client/src/App.tsx
index 2006546..8606376 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -2,6 +2,7 @@ import { useState } from 'react';
 import './App.css';
 import { useInventory } from './hooks/useInventory';
 import { TransactionForm } from './components/TransactionForm';
+import { LOW_STOCK_THRESHOLD } from './constants';
 
 function App() {
   const [selectedSku, setSelectedSku] = useState<string>('MED-AMOX-500');
@@ -29,12 +30,12 @@ function App() {
           </select>
 
           <div style={{
-            backgroundColor: currentStock < 100 ? '#fff0f0' : '#f0fff4',
+            backgroundColor: currentStock < LOW_STOCK_THRESHOLD ? '#fff0f0' : '#f0fff4',
             padding: '2rem',
             borderRadius: '12px',
             textAlign: 'center',
             border: '1px solid',
-            borderColor: currentStock < 100 ? '#ffcccc' : '#bbf7d0'
+            borderColor: currentStock < LOW_STOCK_THRESHOLD ? '#ffcccc' : '#bbf7d0'
           }}>
             <h2 style={{ margin: 0, fontSize: '4rem', fontWeight: '900' }}>{currentStock}</h2>
             <p style={{ margin: 0, color: '#666', textTransform: 'uppercase', letterSpacing: '1px', fontSize: '0.8rem' }}>Current Stock</p>
diff --git a/client/src/constants.ts b/client/src/constants.ts
new file mode 100644
index 0000000..145f4f4
--- /dev/null
+++ b/client/src/constants.ts
@@ -0,0 +1 @@
+export const LOW_STOCK_THRESHOLD = 100;
diff --git a/client/src/db/schema.ts b/client/src/db/schema.ts
index bc4bb84..528d454 100644
--- a/client/src/db/schema.ts
+++ b/client/src/db/schema.ts
@@ -48,7 +48,7 @@ export const TRANSACTION_SCHEMA_LITERAL = {
     required: ['id', 'type', 'sku', 'qty', 'timestamp', 'sync_status']
 } as const;
 
-const schemaTypedTransaction = toTypedRxJsonSchema(TRANSACTION_SCHEMA_LITERAL);
+export const schemaTypedTransaction = toTypedRxJsonSchema(TRANSACTION_SCHEMA_LITERAL);
 export type TransactionDocType = ExtractDocumentTypeFromTypedRxJsonSchema<typeof schemaTypedTransaction>;
 
 export const TransactionSchema: RxJsonSchema<TransactionDocType> = TRANSACTION_SCHEMA_LITERAL;
@@ -79,7 +79,7 @@ export const INVENTORY_SCHEMA_LITERAL = {
     required: ['sku', 'batch_id', 'current_stock']
 } as const;
 
-const schemaTypedInventory = toTypedRxJsonSchema(INVENTORY_SCHEMA_LITERAL);
+export const schemaTypedInventory = toTypedRxJsonSchema(INVENTORY_SCHEMA_LITERAL);
 export type InventoryDocType = ExtractDocumentTypeFromTypedRxJsonSchema<typeof schemaTypedInventory>;
 
 export const InventorySchema: RxJsonSchema<InventoryDocType> = INVENTORY_SCHEMA_LITERAL;
@@ -110,7 +110,7 @@ export const PATIENT_SCHEMA_LITERAL = {
     required: ['id', 'name', 'municipality']
 } as const;
 
-const schemaTypedPatient = toTypedRxJsonSchema(PATIENT_SCHEMA_LITERAL);
+export const schemaTypedPatient = toTypedRxJsonSchema(PATIENT_SCHEMA_LITERAL);
 export type PatientDocType = ExtractDocumentTypeFromTypedRxJsonSchema<typeof schemaTypedPatient>;
 
 export const PatientSchema: RxJsonSchema<PatientDocType> = PATIENT_SCHEMA_LITERAL;