diff --git a/shared/db/schema/users.ts b/shared/db/schema/users.ts
index 0b68988..59eb368 100644
--- a/shared/db/schema/users.ts
+++ b/shared/db/schema/users.ts
@@ -50,7 +50,7 @@ export const userTimers = pgTable('user_timers', {
     userId: bigint('user_id', { mode: 'bigint' })
         .references(() => users.id, { onDelete: 'cascade' }).notNull(),
     type: varchar('type', { length: 50 }).notNull(), // 'COOLDOWN', 'EFFECT', 'ACCESS'
-    key: varchar('key', { length: 100 }).notNull(),  // 'daily', 'chn_12345', 'xp_boost'
+    key: varchar('key', { length: 100 }).notNull(),  // TimerKey, 'chn_12345', 'xp_boost'
     expiresAt: timestamp('expires_at', { withTimezone: true }).notNull(),
     metadata: jsonb('metadata').default({}),
 }, (table) => [
diff --git a/shared/lib/constants.test.ts b/shared/lib/constants.test.ts
new file mode 100644
index 0000000..5cf6af9
--- /dev/null
+++ b/shared/lib/constants.test.ts
@@ -0,0 +1,44 @@
+import { describe, it, expect } from "bun:test";
+import { TimerKey, TimerType, TransactionType } from "./constants";
+
+describe("TimerKey", () => {
+    it("should have CHAT_XP value", () => {
+        expect(TimerKey.CHAT_XP).toBe("chat_xp" as TimerKey);
+    });
+
+    it("should have DAILY value", () => {
+        expect(TimerKey.DAILY).toBe("daily" as TimerKey);
+    });
+
+    it("should have WEEKLY value", () => {
+        expect(TimerKey.WEEKLY).toBe("weekly" as TimerKey);
+    });
+});
+
+describe("TimerType", () => {
+    it("should have COOLDOWN value", () => {
+        expect(TimerType.COOLDOWN).toBe("COOLDOWN" as TimerType);
+    });
+
+    it("should have EFFECT value", () => {
+        expect(TimerType.EFFECT).toBe("EFFECT" as TimerType);
+    });
+
+    it("should have ACCESS value", () => {
+        expect(TimerType.ACCESS).toBe("ACCESS" as TimerType);
+    });
+});
+
+describe("TransactionType", () => {
+    it("should have DAILY_REWARD value", () => {
+        expect(TransactionType.DAILY_REWARD).toBe("DAILY_REWARD" as TransactionType);
+    });
+
+    it("should have TRANSFER_IN value", () => {
+        expect(TransactionType.TRANSFER_IN).toBe("TRANSFER_IN" as TransactionType);
+    });
+
+    it("should have TRANSFER_OUT value", () => {
+        expect(TransactionType.TRANSFER_OUT).toBe("TRANSFER_OUT" as TransactionType);
+    });
+});
diff --git a/shared/lib/constants.ts b/shared/lib/constants.ts
index 653d187..0962f51 100644
--- a/shared/lib/constants.ts
+++ b/shared/lib/constants.ts
@@ -10,6 +10,12 @@ export enum TimerType {
     TRIVIA_COOLDOWN = 'TRIVIA_COOLDOWN',
 }
 
+export enum TimerKey {
+    CHAT_XP = 'chat_xp',
+    DAILY = 'daily',
+    WEEKLY = 'weekly',
+}
+
 export enum EffectType {
     ADD_XP = 'ADD_XP',
     ADD_BALANCE = 'ADD_BALANCE',
diff --git a/shared/modules/economy/economy.service.ts b/shared/modules/economy/economy.service.ts
index f12eab0..c7a7a57 100644
--- a/shared/modules/economy/economy.service.ts
+++ b/shared/modules/economy/economy.service.ts
@@ -4,7 +4,7 @@ import { config } from "@shared/lib/config";
 import { withTransaction } from "@/lib/db";
 import type { Transaction } from "@shared/lib/types";
 import { UserError } from "@shared/lib/errors";
-import { TimerType, TransactionType } from "@shared/lib/constants";
+import { TimerKey, TimerType, TransactionType } from "@shared/lib/constants";
 
 export const economyService = {
     transfer: async (fromUserId: string, toUserId: string, amount: bigint, tx?: Transaction) => {
@@ -82,7 +82,7 @@ export const economyService = {
                 where: and(
                     eq(userTimers.userId, BigInt(userId)),
                     eq(userTimers.type, TimerType.COOLDOWN),
-                    eq(userTimers.key, 'daily')
+                    eq(userTimers.key, TimerKey.DAILY)
                 ),
             });
 
@@ -141,7 +141,7 @@ export const economyService = {
                 .values({
                     userId: BigInt(userId),
                     type: TimerType.COOLDOWN,
-                    key: 'daily',
+                    key: TimerKey.DAILY,
                     expiresAt: nextReadyAt,
                 })
                 .onConflictDoUpdate({
diff --git a/shared/modules/leveling/leveling.service.ts b/shared/modules/leveling/leveling.service.ts
index a009c51..7b6f7ed 100644
--- a/shared/modules/leveling/leveling.service.ts
+++ b/shared/modules/leveling/leveling.service.ts
@@ -3,7 +3,7 @@ import { eq, sql, and } from "drizzle-orm";
 import { withTransaction } from "@/lib/db";
 import { config } from "@shared/lib/config";
 import type { Transaction } from "@shared/lib/types";
-import { TimerType } from "@shared/lib/constants";
+import { TimerKey, TimerType } from "@shared/lib/constants";
 
 export const levelingService = {
     // Calculate total XP required to REACH a specific level (Cumulative)
@@ -84,7 +84,7 @@ export const levelingService = {
                 where: and(
                     eq(userTimers.userId, BigInt(id)),
                     eq(userTimers.type, TimerType.COOLDOWN),
-                    eq(userTimers.key, 'chat_xp')
+                    eq(userTimers.key, TimerKey.CHAT_XP)
                 ),
             });
 
@@ -120,7 +120,7 @@ export const levelingService = {
                 .values({
                     userId: BigInt(id),
                     type: TimerType.COOLDOWN,
-                    key: 'chat_xp',
+                    key: TimerKey.CHAT_XP,
                     expiresAt: nextReadyAt,
                 })
                 .onConflictDoUpdate({