diff --git a/services/database.ts b/services/database.ts
index ec5f656..370108d 100644
--- a/services/database.ts
+++ b/services/database.ts
@@ -7,6 +7,11 @@ import { SimpleDate } from "../util/SimpleDate";
 
 let db: SQLite.SQLiteDatabase;
 
+export enum CategoryType {
+    SAVING = "saving",
+    EXPENSE = "expense",
+}
+
 export const initDatabase = async () => {
     db = SQLite.openDatabase("interactive_systeme.db");
     try {
@@ -24,11 +29,11 @@ export const initDatabase = async () => {
     }
 };
 
-export const updateCategory = async (guid: string, name: string, color: string, type: string, allocated_amount: number) => {
+export const updateCategory = async (guid: string, name: string, color: string, CategoryType: CategoryType, allocated_amount: number) => {
 
     try {
         await db.transactionAsync(async (tx) => {
-            await tx.executeSqlAsync("UPDATE category SET name = ?, color = ?, type = ?, allocated_amount = ? WHERE guid = ?", [name, color, type, allocated_amount, guid]);
+            await tx.executeSqlAsync("UPDATE category SET name = ?, color = ?, type = ?, allocated_amount = ? WHERE guid = ?", [name, color, CategoryType, allocated_amount, guid]);
         });
     } catch (error) {
         console.log("Error updating category: ", error);
@@ -36,7 +41,7 @@ export const updateCategory = async (guid: string, name: string, color: string,
     }
 };
 
-export const addCategory = async (name: string, color: string, type: string, allocated_amount: number) => {
+export const addCategory = async (name: string, color: string, CategoryType: CategoryType, allocated_amount: number) => {
 
     //needs user input validation for type and color (should be validated by this function)
 
@@ -45,7 +50,7 @@ export const addCategory = async (name: string, color: string, type: string, all
     try {
         await db.transactionAsync(async (tx) => {
             await tx.executeSqlAsync("INSERT INTO category (guid, name, color, type, allocated_amount) VALUES (?, ?, ?, ?, ?);",
-                [UUID.toString(), name, color, type, allocated_amount]
+                [UUID.toString(), name, color, CategoryType, allocated_amount]
             );
         });
     } catch (error) {
@@ -171,8 +176,9 @@ export const DEV_populateDatabase = async () => {
 
         for(let i=0; i < 5; i++){
             let random = Math.floor(Math.random() * colors.length);
-            await addCategory(`Category ${i}`, colors[random], "budget", 50)
-            await addCategory(`Category ${i+6}`, colors[random], "budget", 50)
+            await addCategory(`Category ${i}`, colors[random], CategoryType.EXPENSE, 50)
+            random = Math.floor(Math.random() * colors.length);
+            await addCategory(`Category ${i+6}`, colors[random], CategoryType.SAVING, 50)
         }
         const result = await executeQuery({sql:"SELECT * from category", args:[]})
         let categories: {[column: string]: any}[];