diff --git a/backend/src/services/SupabaseService.ts b/backend/src/services/SupabaseService.ts
index 32e555b..d3dd40f 100644
--- a/backend/src/services/SupabaseService.ts
+++ b/backend/src/services/SupabaseService.ts
@@ -38,22 +38,9 @@ export type {
     StaleOrderScope,
     VirtualOpenPosition
 } from './tradingPersistenceTypes.js';
+import type { UserConfig } from './tradingUserTypes.js';
 
-export interface UserConfig {
-    user_id: string;
-    first_name: string;
-    last_name: string;
-    email: string;
-    ALPACA_API_KEY: string;
-    ALPACA_SECRET_KEY: string;
-    REAL_ALPACA_API_KEY: string;
-    REAL_ALPACA_SECRET_KEY: string;
-    role: string;
-    trade_enable: boolean;
-    drop_threshold_for_buy: number;
-    gain_threshold_for_sell: number;
-    market_poll_interval_in_seconds: number;
-}
+export type { UserConfig } from './tradingUserTypes.js';
 
 class SupabaseService {
     private client: SupabaseClient | null = null;
diff --git a/backend/src/services/tradingUserTypes.ts b/backend/src/services/tradingUserTypes.ts
new file mode 100644
index 0000000..336b3f3
--- /dev/null
+++ b/backend/src/services/tradingUserTypes.ts
@@ -0,0 +1,19 @@
+/**
+ * Trading user row shape shared by Cosmos `trading_users` documents and legacy Postgres `users` table.
+ */
+
+export interface UserConfig {
+    user_id: string;
+    first_name: string;
+    last_name: string;
+    email: string;
+    ALPACA_API_KEY: string;
+    ALPACA_SECRET_KEY: string;
+    REAL_ALPACA_API_KEY: string;
+    REAL_ALPACA_SECRET_KEY: string;
+    role: string;
+    trade_enable: boolean;
+    drop_threshold_for_buy: number;
+    gain_threshold_for_sell: number;
+    market_poll_interval_in_seconds: number;
+}
diff --git a/backend/src/services/userRepository.ts b/backend/src/services/userRepository.ts
index 09b4841..d61c386 100644
--- a/backend/src/services/userRepository.ts
+++ b/backend/src/services/userRepository.ts
@@ -1,8 +1,8 @@
 import { getContainer } from '@bytelyst/cosmos';
 import { config } from '../config/index.js';
 import logger from '../utils/logger.js';
-import type { UserConfig } from './SupabaseService.js';
 import { supabaseService } from './SupabaseService.js';
+import type { UserConfig } from './tradingUserTypes.js';
 
 const USER_PROFILE_CONTAINER = 'trading_users';