feat: Introduce TimerKey enum and refactor timer key usage across services with new tests.

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({