diff --git a/src/main/java/com/wok/supportbot/controller/AiController.java b/src/main/java/com/wok/supportbot/controller/AiController.java
index 20ba420..0923a29 100644
--- a/src/main/java/com/wok/supportbot/controller/AiController.java
+++ b/src/main/java/com/wok/supportbot/controller/AiController.java
@@ -72,7 +72,7 @@ public class AiController {
      */
     @GetMapping("/assistant_app/chat/sync")
     public String doChatWithAssistantAppSync(String message, String chatId, Long roleId, String accountId, String systemPrompt) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         bindConversation(chatId, context);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         return assistantApp.doChat(message, chatId, resolveSystemPrompt(scope, systemPrompt));
@@ -88,7 +88,7 @@ public class AiController {
      */
     @GetMapping(value = "/assistant_app/chat/sse", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
     public Flux<String> doChatWithLoveAppSSE(String message, String chatId, Long roleId, String accountId, String systemPrompt) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         bindConversation(chatId, context);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         return assistantApp.doChatByStream(message, chatId, resolveSystemPrompt(scope, systemPrompt));
@@ -104,7 +104,7 @@ public class AiController {
      */
     @GetMapping(value = "/assistant_app/chat/server_sent_event")
     public Flux<ServerSentEvent<String>> doChatWithAssistantAppServerSentEvent(String message, String chatId, Long roleId, String accountId, String systemPrompt) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         bindConversation(chatId, context);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         return assistantApp.doChatByStream(message, chatId, resolveSystemPrompt(scope, systemPrompt))
@@ -123,7 +123,7 @@ public class AiController {
      */
     @GetMapping(value = "/assistant_app/chat/sse_emitter")
     public SseEmitter doChatWithAssistantAppServerSseEmitter(String message, String chatId, Long roleId, String accountId, String systemPrompt) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         bindConversation(chatId, context);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         // 创建一个超时时间较长的 SseEmitter
@@ -155,7 +155,7 @@ public class AiController {
      */
     @GetMapping("/assistant_app/chat/rag/sync")
     public String doChatWithRagSync(String message, String chatId, String rewriteStrategy, Long roleId, String accountId, Long categoryId, String categoryIds, String systemPrompt) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         bindConversation(chatId, context);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         String sys = resolveSystemPrompt(scope, systemPrompt);
@@ -182,7 +182,7 @@ public class AiController {
      */
     @GetMapping(value = "/assistant_app/chat/rag/sse", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
     public Flux<String> doChatWithRagSSE(String message, String chatId, String rewriteStrategy, Long roleId, String accountId, Long categoryId, String categoryIds, String systemPrompt) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         bindConversation(chatId, context);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         String sys = resolveSystemPrompt(scope, systemPrompt);
@@ -202,7 +202,7 @@ public class AiController {
     @GetMapping("/assistant_app/rag/sources")
     public Map<String, Object> getRagSources(String message, String chatId, String rewriteStrategy,
                                              Long roleId, String accountId, Long categoryId, String categoryIds) {
-        AccountRoleContext context = resolveAccountRole(toLong(accountId), roleId);
+        AccountRoleContext context = resolveAccountRole(accountId, roleId);
         RoleScope scope = customerServiceRoleService.getRoleScope(context.roleId());
         if (message == null || message.isBlank() || isKbDenied(scope) || shouldBypassKnowledgeRetrieval(message)) {
             return Map.of("success", true, "data", List.of());
@@ -264,8 +264,8 @@ public class AiController {
     }
 
     /** 命中角色时用角色人设，否则用客户端兜底人设。 */
-    private AccountRoleContext resolveAccountRole(Long accountId, Long fallbackRoleId) {
-        AccountScope accountScope = customerAccountService.getAccountScope(accountId);
+    private AccountRoleContext resolveAccountRole(String accountId, Long fallbackRoleId) {
+        AccountScope accountScope = customerAccountService.getOrCreateAccountScope(accountId, fallbackRoleId);
         Long effectiveRoleId = accountScope.hasAccount() && accountScope.roleId() != null
                 ? accountScope.roleId()
                 : fallbackRoleId;
@@ -316,15 +316,4 @@ public class AiController {
     private record AccountRoleContext(Long accountId, Long roleId) {
     }
 
-    /** 将字符串 accountId 安全转为 Long，非数字字符串返回 null */
-    private static Long toLong(String value) {
-        if (value == null || value.isBlank()) {
-            return null;
-        }
-        try {
-            return Long.valueOf(value.trim());
-        } catch (NumberFormatException e) {
-            return null;
-        }
-    }
 }
diff --git a/src/main/java/com/wok/supportbot/service/CustomerAccountService.java b/src/main/java/com/wok/supportbot/service/CustomerAccountService.java
index ca35b28..ef1a391 100644
--- a/src/main/java/com/wok/supportbot/service/CustomerAccountService.java
+++ b/src/main/java/com/wok/supportbot/service/CustomerAccountService.java
@@ -1,6 +1,7 @@
 package com.wok.supportbot.service;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.dao.DuplicateKeyException;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -102,10 +103,73 @@ public class CustomerAccountService {
         return new AccountScope(true, ((Number) row.get("id")).longValue(), Objects.toString(row.get("name"), ""), roleId);
     }
 
+    @Transactional(rollbackFor = Exception.class)
+    public AccountScope getOrCreateAccountScope(String accountId, Long fallbackRoleId) {
+        if (accountId == null || accountId.trim().isEmpty()) {
+            return AccountScope.empty();
+        }
+
+        String accountKey = accountId.trim();
+        Long numericAccountId = toLong(accountKey);
+        AccountScope scope = getAccountScope(numericAccountId);
+        if (scope.hasAccount()) {
+            return scope;
+        }
+
+        scope = getAccountScopeByKey(accountKey);
+        if (scope.hasAccount()) {
+            return scope;
+        }
+
+        Long roleId = normalizeRoleId(fallbackRoleId);
+        try {
+            jdbcTemplate.update("""
+                    INSERT INTO customer_account (account_key, name, description, role_id, enabled, is_delete)
+                    VALUES (?, ?, ?, ?, true, false)
+                    ON CONFLICT (account_key)
+                    DO UPDATE SET enabled = true,
+                                  is_delete = false,
+                                  role_id = COALESCE(customer_account.role_id, EXCLUDED.role_id),
+                                  update_time = CURRENT_TIMESTAMP
+                    """,
+                    accountKey, accountKey, "Auto-created from external chat accountId", roleId);
+        } catch (DuplicateKeyException ignored) {
+            // Another request may have created the same account; read it below.
+        }
+        return getAccountScopeByKey(accountKey);
+    }
+
+    private AccountScope getAccountScopeByKey(String accountKey) {
+        if (accountKey == null || accountKey.trim().isEmpty()) {
+            return AccountScope.empty();
+        }
+        List<Map<String, Object>> rows = jdbcTemplate.queryForList("""
+                SELECT id, name, role_id
+                FROM customer_account
+                WHERE account_key = ? AND is_delete = false AND enabled = true
+                """, accountKey.trim());
+        if (rows.isEmpty()) {
+            return AccountScope.empty();
+        }
+        Map<String, Object> row = rows.get(0);
+        Long roleId = row.get("role_id") == null ? null : ((Number) row.get("role_id")).longValue();
+        return new AccountScope(true, ((Number) row.get("id")).longValue(), Objects.toString(row.get("name"), ""), roleId);
+    }
     private Long normalizeRoleId(Long roleId) {
         return roleId != null && roleId > 0 ? roleId : null;
     }
 
+
+    private static Long toLong(String value) {
+        if (value == null || value.isBlank()) {
+            return null;
+        }
+        try {
+            return Long.valueOf(value.trim());
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
     public record AccountScope(boolean present, Long accountId, String name, Long roleId) {
 
         public static AccountScope empty() {