diff --git a/app/src/main/java/com/hyperling/expensetracker/Expense.kt b/app/src/main/java/com/hyperling/expensetracker/Expense.kt
index 23e2aa7..2445868 100644
--- a/app/src/main/java/com/hyperling/expensetracker/Expense.kt
+++ b/app/src/main/java/com/hyperling/expensetracker/Expense.kt
@@ -1,23 +1,13 @@
 package com.hyperling.expensetracker
 
-/*class Expense {
-    var name: String = ""
-    var cost: Double = 0.0
-    var freq: Char = '*'
-    var note: String = ""
+import androidx.room.Entity
+import androidx.room.PrimaryKey
 
-    /*public Expense (val name: String, val cost: Double, val freq: Char, val note: String) {
-        this.name = name
-        this.name = name
-        this.name = name
-        this.name = name
-    }*/
-}*/
-
-class Expense (
-    var name: String = "",
-    var cost: Double = 0.0,
-    var freq: Char = '*',
-    var note: String = "",
-) {
-}
\ No newline at end of file
+@Entity
+data class Expense (
+    val name: String,
+    val cost: Double,
+    val rate: Enum<Rate>,
+    @PrimaryKey(autoGenerate = true)
+    val ID: Int = 0,
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/hyperling/expensetracker/Rate.kt b/app/src/main/java/com/hyperling/expensetracker/Rate.kt
new file mode 100644
index 0000000..cf4c858
--- /dev/null
+++ b/app/src/main/java/com/hyperling/expensetracker/Rate.kt
@@ -0,0 +1,8 @@
+package com.hyperling.expensetracker
+
+enum class Rate {
+    DAILY,
+    WEEKLY,
+    MONTHLY,
+    YEARLY,
+}
\ No newline at end of file