diff --git a/backend/alembic/versions/031_modify_chat_record.py b/backend/alembic/versions/031_modify_chat_record.py
new file mode 100644
index 00000000..aa391e26
--- /dev/null
+++ b/backend/alembic/versions/031_modify_chat_record.py
@@ -0,0 +1,33 @@
+"""031_modify_chat_record
+
+Revision ID: bd2ed188b5bd
+Revises: c1d7ac00b3a8
+Create Date: 2025-07-21 17:27:55.985821
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'bd2ed188b5bd'
+down_revision = 'c1d7ac00b3a8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat_record', 'engine_type',
+               existing_type=sa.VARCHAR(length=64),
+               nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat_record', 'engine_type',
+               existing_type=sa.VARCHAR(length=64),
+               nullable=False)
+    # ### end Alembic commands ###
diff --git a/backend/apps/chat/models/chat_model.py b/backend/apps/chat/models/chat_model.py
index 199fae5a..a83c6b07 100644
--- a/backend/apps/chat/models/chat_model.py
+++ b/backend/apps/chat/models/chat_model.py
@@ -36,7 +36,7 @@ class ChatRecord(SQLModel, table=True):
     finish_time: datetime = Field(sa_column=Column(DateTime(timezone=False), nullable=True))
     create_by: int = Field(sa_column=Column(BigInteger, nullable=True))
     datasource: int = Field(sa_column=Column(BigInteger, nullable=True))
-    engine_type: str = Field(max_length=64)
+    engine_type: str = Field(max_length=64, nullable=True)
     question: str = Field(sa_column=Column(Text, nullable=True))
     sql_answer: str = Field(sa_column=Column(Text, nullable=True))
     sql: str = Field(sa_column=Column(Text, nullable=True))
diff --git a/backend/apps/chat/task/llm.py b/backend/apps/chat/task/llm.py
index 2392058c..d8e23569 100644
--- a/backend/apps/chat/task/llm.py
+++ b/backend/apps/chat/task/llm.py
@@ -403,22 +403,24 @@ class LLMService:
 
             if data['id'] and data['id'] != 0:
                 _datasource = data['id']
-                if self.current_assistant.type == 1:
+                _chat = self.session.get(Chat, self.record.chat_id)
+                _chat.datasource = _datasource
+                if self.current_assistant and self.current_assistant.type == 1:
                     _ds = self.out_ds_instance.get_ds(data['id'])
                     self.ds = _ds
+                    self.chat_question.engine = _ds.type
+                    _engine_type = self.chat_question.engine
+                    _chat.engine_type =  _ds.type
                 else:
                     _ds = self.session.get(CoreDatasource, _datasource)
                     if not _ds:
                         _datasource = None
                         raise Exception(f"Datasource configuration with id {_datasource} not found")
                     self.ds = CoreDatasource(**_ds.model_dump())
-                self.chat_question.engine = _ds.type_name if _ds.type != 'excel' else 'PostgreSQL'
-                _engine_type = self.chat_question.engine
+                    self.chat_question.engine = _ds.type_name if _ds.type != 'excel' else 'PostgreSQL'
+                    _engine_type = self.chat_question.engine
+                    _chat.engine_type = _ds.type_name
                 # save chat
-                _chat = self.session.get(Chat, self.record.chat_id)
-                _chat.datasource = _datasource
-                _chat.engine_type = _ds.type_name
-
                 self.session.add(_chat)
                 self.session.flush()
                 self.session.refresh(_chat)
@@ -734,7 +736,7 @@ def run_task(llm_service: LLMService, in_chat: bool = True):
                          'type': 'datasource-result'}).decode() + '\n\n'
             if in_chat:
                 yield orjson.dumps({'id': llm_service.ds.id, 'datasource_name': llm_service.ds.name,
-                                    'engine_type': llm_service.ds.type_name, 'type': 'datasource'}).decode() + '\n\n'
+                                    'engine_type': llm_service.ds.type_name or llm_service.ds.type, 'type': 'datasource'}).decode() + '\n\n'
 
             llm_service.chat_question.db_schema = llm_service.out_ds_instance.get_db_schema() if llm_service.out_ds_instance else get_table_schema(session=llm_service.session, current_user=llm_service.current_user, ds=llm_service.ds)
 
diff --git a/backend/apps/datasource/crud/datasource.py b/backend/apps/datasource/crud/datasource.py
index d60a173e..0168c420 100644
--- a/backend/apps/datasource/crud/datasource.py
+++ b/backend/apps/datasource/crud/datasource.py
@@ -230,19 +230,26 @@ def updateField(session: SessionDep, field: CoreField):
 
 
 def preview(session: SessionDep, id: int, data: TableObj):
+    if data.fields is None or len(data.fields) == 0:
+        return {"fields": [], "data": [], "sql": ''}
+
+    fields = [f.field_name for f in data.fields if f.checked]
+    if fields is None or len(fields) == 0:
+        return {"fields": [], "data": [], "sql": ''}
+
     ds = session.query(CoreDatasource).filter(CoreDatasource.id == id).first()
     conf = DatasourceConf(**json.loads(aes_decrypt(ds.configuration))) if ds.type != "excel" else get_engine_config()
     sql: str = ""
     if ds.type == "mysql":
-        sql = f"""SELECT `{"`, `".join([f.field_name for f in data.fields if f.checked])}` FROM `{data.table.table_name}` LIMIT 100"""
+        sql = f"""SELECT `{"`, `".join(fields)}` FROM `{data.table.table_name}` LIMIT 100"""
     elif ds.type == "sqlServer":
-        sql = f"""SELECT [{"], [".join([f.field_name for f in data.fields if f.checked])}] FROM [{conf.dbSchema}].[{data.table.table_name}]
+        sql = f"""SELECT [{"], [".join(fields)}] FROM [{conf.dbSchema}].[{data.table.table_name}]
             ORDER BY [{data.fields[0].field_name}]
             OFFSET 0 ROWS FETCH NEXT 100 ROWS ONLY"""
     elif ds.type == "pg" or ds.type == "excel":
-        sql = f"""SELECT "{'", "'.join([f.field_name for f in data.fields if f.checked])}" FROM "{conf.dbSchema}"."{data.table.table_name}" LIMIT 100"""
+        sql = f"""SELECT "{'", "'.join(fields)}" FROM "{conf.dbSchema}"."{data.table.table_name}" LIMIT 100"""
     elif ds.type == "oracle":
-        sql = f"""SELECT "{'", "'.join([f.field_name for f in data.fields if f.checked])}" FROM "{conf.dbSchema}"."{data.table.table_name}"
+        sql = f"""SELECT "{'", "'.join(fields)}" FROM "{conf.dbSchema}"."{data.table.table_name}"
             ORDER BY "{data.fields[0].field_name}"
             OFFSET 0 ROWS FETCH NEXT 100 ROWS ONLY"""
     return exec_sql(ds, sql)
diff --git a/backend/apps/system/crud/assistant.py b/backend/apps/system/crud/assistant.py
index b830e104..5aadc8f0 100644
--- a/backend/apps/system/crud/assistant.py
+++ b/backend/apps/system/crud/assistant.py
@@ -8,7 +8,7 @@ from sqlmodel import Session, select
 from apps.datasource.models.datasource import CoreDatasource
 from apps.system.models.system_model import AssistantModel
 from apps.system.schemas.auth import CacheName, CacheNamespace
-from apps.system.schemas.system_schema import UserInfoDTO
+from apps.system.schemas.system_schema import AssistantOutDsSchema, UserInfoDTO
 from common.core.sqlbot_cache import cache
 from common.core.db import engine
 from starlette.middleware.cors import CORSMiddleware
@@ -73,7 +73,7 @@ def init_dynamic_cors(app: FastAPI):
 
 class AssistantOutDs:
     assistant: AssistantModel
-    ds_list: Optional[list[dict]] = None
+    ds_list: Optional[list[AssistantOutDsSchema]] = None
     certificate: Optional[str] = None
     def __init__(self, assistant: AssistantModel, certificate: Optional[str] = None):
         self.assistant = assistant
@@ -99,9 +99,11 @@ class AssistantOutDs:
             result_json: dict[any] = json.loads(res.json())
             if result_json.get('code') == 0:
                 temp_list = result_json.get('data', [])
-                for idx, item in enumerate(temp_list, start=1):
-                    item["id"] = idx
-                self.ds_list = temp_list
+                self.ds_list = [
+                    AssistantOutDsSchema(**{**item, "id": idx})
+                    for idx, item in enumerate(temp_list, start=1)
+                ]
+                
                 return self.ds_list
             else:
                 raise Exception(f"Failed to get datasource list from {endpoint}, error: {result_json.get('message')}")
@@ -110,12 +112,25 @@ class AssistantOutDs:
     
     def get_simple_ds_list(self):
         if self.ds_list:
-            return [{'id': ds['id'], 'name': ds['name'], 'description': ds['comment']} for ds in self.ds_list]
+            return [{'id': ds.id, 'name': ds.name, 'description': ds.comment} for ds in self.ds_list]
         else:
             raise Exception("Datasource list is not found.")
        
-    def get_db_schema(self, ds_id: int):
-        return None
+    def get_db_schema(self, ds_id: int) -> str:
+        ds = self.get_ds(ds_id)
+        schema_str = ""
+        db_name = ds.schema
+        schema_str += f"【DB_ID】 {db_name}\n【Schema】\n"
+        for table in ds.tables:
+            schema_str += f"# Table: {db_name}.{table.name}"
+            schema_str += f", {table.comment}\n[\n"
+            field_list = []
+            for field in table.fields:
+                field_list.append(f"({field.name}:{field.type}, {field.comment})")
+            schema_str += ",\n".join(field_list)
+            schema_str += '\n]\n'
+        return schema_str
+    
     def get_ds(self, ds_id: int):
         if self.ds_list:
             for ds in self.ds_list:
diff --git a/backend/apps/system/schemas/system_schema.py b/backend/apps/system/schemas/system_schema.py
index 30592c31..d94bffd8 100644
--- a/backend/apps/system/schemas/system_schema.py
+++ b/backend/apps/system/schemas/system_schema.py
@@ -101,4 +101,53 @@ class UserWs(BaseCreatorDTO):
     name: str
     
 class UserWsOption(UserWs):
-    account: str
\ No newline at end of file
+    account: str
+    
+    
+class AssistantFieldSchema(BaseModel):
+    id: Optional[int] = None
+    name: Optional[str] = None
+    type: Optional[str] = None
+    comment: Optional[str] = None
+class AssistantTableSchema(BaseModel):
+    id: Optional[int] = None
+    name: Optional[str] = None
+    comment: Optional[str] = None
+    rule: Optional[str] = None
+    sql: Optional[str] = None
+    fields: Optional[list[AssistantFieldSchema]] = None
+
+class AssistantOutDsBase(BaseModel):
+    id: Optional[int] = None
+    name: str
+    type: Optional[str] = None
+    type_name: Optional[str] = None
+    comment: Optional[str] = None
+    description: Optional[str] = None
+    
+    def __init__(self, id: Optional[int] = None, name: str = '', type: Optional[str] = None,
+                 type_name: Optional[str] = None, comment: Optional[str] = None):
+        super().__init__(id=id, name=name, type=type, type_name=type_name, comment=comment)
+        
+class AssistantOutDsSchema(AssistantOutDsBase):
+    host: Optional[str] = None
+    port: Optional[int] = None
+    user: Optional[str] = None
+    password: Optional[str] = None
+    schema: Optional[str] = None
+    tables: Optional[list[AssistantTableSchema]] = None
+
+    def __init__(self, id: int, name: str, comment: Optional[str] = None, type: Optional[str] = None,
+                 type_name: Optional[str] = None, host: Optional[str] = None, port: Optional[int] = None,
+                 username: Optional[str] = None, password: Optional[str] = None, schema: Optional[str] = None):
+        self.id = id
+        self.name = name
+        self.comment = comment
+        self.type = type
+        self.type_name = type_name
+        self.host = host
+        self.port = port
+        self.username = username
+        self.password = password
+        self.schema = schema
+        self.description = comment
\ No newline at end of file
diff --git a/frontend/src/views/chat/RecommendQuestion.vue b/frontend/src/views/chat/RecommendQuestion.vue
index b539e82b..6cf0a025 100644
--- a/frontend/src/views/chat/RecommendQuestion.vue
+++ b/frontend/src/views/chat/RecommendQuestion.vue
@@ -1,18 +1,37 @@
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, nextTick, ref } from 'vue'
 import { endsWith, startsWith } from 'lodash-es'
 import { useI18n } from 'vue-i18n'
+import { chatApi, ChatInfo } from '@/api/chat.ts'
 
 const props = withDefaults(
   defineProps<{
+    recordId?: number
+    currentChat?: ChatInfo
     questions?: string
     firstChat?: boolean
   }>(),
   {
+    recordId: undefined,
+    currentChat: () => new ChatInfo(),
     questions: '[]',
     firstChat: false,
   }
 )
+
+const emits = defineEmits(['clickQuestion', 'update:currentChat'])
+
+const loading = ref(false)
+
+const _currentChat = computed({
+  get() {
+    return props.currentChat
+  },
+  set(v) {
+    emits('update:currentChat', v)
+  },
+})
+
 const computedQuestions = computed<string>(() => {
   if (
     props.questions &&
@@ -25,20 +44,98 @@ const computedQuestions = computed<string>(() => {
   return []
 })
 
-const emits = defineEmits(['clickQuestion'])
-
 const { t } = useI18n()
 
 function clickQuestion(question: string): void {
   emits('clickQuestion', question)
 }
+
+async function getRecommendQuestions() {
+  loading.value = true
+  try {
+    const response = await chatApi.recommendQuestions(props.recordId)
+    const reader = response.body.getReader()
+    const decoder = new TextDecoder()
+
+    while (true) {
+      const { done, value } = await reader.read()
+      if (done) {
+        break
+      }
+
+      const chunk = decoder.decode(value)
+
+      let _list = [chunk]
+
+      const lines = chunk.trim().split('}\n\n{')
+      if (lines.length > 1) {
+        _list = []
+        for (let line of lines) {
+          if (!line.trim().startsWith('{')) {
+            line = '{' + line.trim()
+          }
+          if (!line.trim().endsWith('}')) {
+            line = line.trim() + '}'
+          }
+          _list.push(line)
+        }
+      }
+
+      for (const str of _list) {
+        let data
+        try {
+          data = JSON.parse(str)
+        } catch (err) {
+          console.error('JSON string:', str)
+          throw err
+        }
+
+        if (data.code && data.code !== 200) {
+          ElMessage({
+            message: data.msg,
+            type: 'error',
+            showClose: true,
+          })
+          return
+        }
+
+        switch (data.type) {
+          case 'recommended_question':
+            if (
+              data.content &&
+              data.content.length > 0 &&
+              startsWith(data.content.trim(), '[') &&
+              endsWith(data.content.trim(), ']')
+            ) {
+              if (_currentChat.value?.records) {
+                for (let record of _currentChat.value.records) {
+                  if (record.id === props.recordId) {
+                    record.recommended_question = data.content
+
+                    await nextTick()
+                  }
+                }
+              }
+            }
+        }
+      }
+    }
+  } finally {
+    loading.value = false
+  }
+}
+
+defineExpose({ getRecommendQuestions, id: () => props.recordId })
 </script>
 
 <template>
-  <div v-if="computedQuestions.length > 0" class="recommend-questions">
+  <div v-if="computedQuestions.length > 0 || loading" class="recommend-questions">
     <div v-if="firstChat">{{ t('qa.guess_u_ask') }}</div>
     <div v-else class="continue-ask">{{ t('qa.continue_to_ask') }}</div>
-    <div class="question-grid">
+    <div v-if="loading">
+      <el-button style="min-width: unset" type="primary" link loading />
+    </div>
+    <div v-else class="question-grid">
       <div
         v-for="(question, index) in computedQuestions"
         :key="index"
diff --git a/frontend/src/views/chat/answer/AnalysisAnswer.vue b/frontend/src/views/chat/answer/AnalysisAnswer.vue
index 7118f320..90a6a1ac 100644
--- a/frontend/src/views/chat/answer/AnalysisAnswer.vue
+++ b/frontend/src/views/chat/answer/AnalysisAnswer.vue
@@ -5,9 +5,9 @@ import { computed, nextTick } from 'vue'
 import MdComponent from '@/views/chat/component/MdComponent.vue'
 const props = withDefaults(
   defineProps<{
-    chatList: Array<ChatInfo>
+    chatList?: Array<ChatInfo>
     currentChatId?: number
-    currentChat: ChatInfo
+    currentChat?: ChatInfo
     message?: ChatMessage
     loading?: boolean
   }>(),
diff --git a/frontend/src/views/chat/answer/ChartAnswer.vue b/frontend/src/views/chat/answer/ChartAnswer.vue
index 8b81fd96..3a5c0fec 100644
--- a/frontend/src/views/chat/answer/ChartAnswer.vue
+++ b/frontend/src/views/chat/answer/ChartAnswer.vue
@@ -4,9 +4,9 @@ import { Chat, chatApi, ChatInfo, type ChatMessage, ChatRecord, questionApi } fr
 import { computed, nextTick } from 'vue'
 const props = withDefaults(
   defineProps<{
-    chatList: Array<ChatInfo>
+    chatList?: Array<ChatInfo>
     currentChatId?: number
-    currentChat: ChatInfo
+    currentChat?: ChatInfo
     message?: ChatMessage
     loading?: boolean
     reasoningName: 'sql_answer' | 'chart_answer' | Array<'sql_answer' | 'chart_answer'>
diff --git a/frontend/src/views/chat/answer/PredictAnswer.vue b/frontend/src/views/chat/answer/PredictAnswer.vue
index 64e73f76..ba45b6fd 100644
--- a/frontend/src/views/chat/answer/PredictAnswer.vue
+++ b/frontend/src/views/chat/answer/PredictAnswer.vue
@@ -5,9 +5,9 @@ import { computed, nextTick } from 'vue'
 import MdComponent from '@/views/chat/component/MdComponent.vue'
 const props = withDefaults(
   defineProps<{
-    chatList: Array<ChatInfo>
+    chatList?: Array<ChatInfo>
     currentChatId?: number
-    currentChat: ChatInfo
+    currentChat?: ChatInfo
     message?: ChatMessage
     loading?: boolean
   }>(),
diff --git a/frontend/src/views/chat/chat-block/ChartBlock.vue b/frontend/src/views/chat/chat-block/ChartBlock.vue
index 18f777fc..6533022c 100644
--- a/frontend/src/views/chat/chat-block/ChartBlock.vue
+++ b/frontend/src/views/chat/chat-block/ChartBlock.vue
@@ -193,8 +193,9 @@ function addToDashboard() {
 <template>
   <div
     v-if="
-      (!isPredict && (message?.record?.sql || message?.record?.chart)) ||
-      (isPredict && message?.record?.chart && data.length > 0)
+      !message.isTyping &&
+      ((!isPredict && (message?.record?.sql || message?.record?.chart)) ||
+        (isPredict && message?.record?.chart && data.length > 0))
     "
     class="chart-component-container"
     :class="{ 'full-screen': enlarge }"
diff --git a/frontend/src/views/chat/index.vue b/frontend/src/views/chat/index.vue
index 1f299f20..aad261e3 100644
--- a/frontend/src/views/chat/index.vue
+++ b/frontend/src/views/chat/index.vue
@@ -93,6 +93,9 @@
               <ChatRow :current-chat="currentChat" :msg="message" :hide-avatar="message.first_chat">
                 <RecommendQuestion
                   v-if="message.role === 'assistant' && message.first_chat"
+                  ref="recommendQuestionRef"
+                  :current-chat="currentChat"
+                  :record-id="message.record?.id"
                   :questions="message.recommended_question"
                   :first-chat="message.first_chat"
                   @click-question="quickAsk"
@@ -181,6 +184,9 @@
                     </template>
                     <template #footer>
                       <RecommendQuestion
+                        ref="recommendQuestionRef"
+                        :current-chat="currentChat"
+                        :record-id="message.record?.id"
                         :questions="message.recommended_question"
                         :first-chat="message.first_chat"
                         @click-question="quickAsk"
@@ -303,7 +309,7 @@ import ChatListContainer from './ChatListContainer.vue'
 import ChatCreator from '@/views/chat/ChatCreator.vue'
 import ChatToolBar from './ChatToolBar.vue'
 import { useI18n } from 'vue-i18n'
-import { endsWith, find, startsWith } from 'lodash-es'
+import { find } from 'lodash-es'
 import icon_new_chat_outlined from '@/assets/svg/icon_new_chat_outlined.svg'
 import icon_sidebar_outlined from '@/assets/svg/icon_sidebar_outlined.svg'
 import icon_replace_outlined from '@/assets/svg/icon_replace_outlined.svg'
@@ -373,6 +379,7 @@ const computedMessages = computed<Array<ChatMessage>>(() => {
     })
   }
 
+  console.log(messages)
   return messages
 })
 
@@ -465,72 +472,24 @@ function onChatCreated(chat: ChatInfo) {
   }
 }
 
-async function getRecommendQuestions(record_id?: number) {
-  const response = await chatApi.recommendQuestions(record_id)
-  const reader = response.body.getReader()
-  const decoder = new TextDecoder()
+const recommendQuestionRef = ref()
 
-  while (true) {
-    const { done, value } = await reader.read()
-    if (done) {
-      break
-    }
-
-    const chunk = decoder.decode(value)
-
-    let _list = [chunk]
-
-    const lines = chunk.trim().split('}\n\n{')
-    if (lines.length > 1) {
-      _list = []
-      for (let line of lines) {
-        if (!line.trim().startsWith('{')) {
-          line = '{' + line.trim()
-        }
-        if (!line.trim().endsWith('}')) {
-          line = line.trim() + '}'
-        }
-        _list.push(line)
-      }
-    }
-
-    for (const str of _list) {
-      let data
-      try {
-        data = JSON.parse(str)
-      } catch (err) {
-        console.error('JSON string:', str)
-        throw err
-      }
-
-      if (data.code && data.code !== 200) {
-        ElMessage({
-          message: data.msg,
-          type: 'error',
-          showClose: true,
-        })
-        return
-      }
-
-      switch (data.type) {
-        case 'recommended_question':
-          if (
-            data.content &&
-            data.content.length > 0 &&
-            startsWith(data.content.trim(), '[') &&
-            endsWith(data.content.trim(), ']')
-          ) {
-            if (currentChat.value?.records) {
-              for (let record of currentChat.value.records) {
-                if (record.id === record_id) {
-                  record.recommended_question = data.content
-                }
-              }
-            }
+function getRecommendQuestions(id?: number) {
+  nextTick(() => {
+    if (recommendQuestionRef.value) {
+      if (recommendQuestionRef.value instanceof Array) {
+        for (let i = 0; i < recommendQuestionRef.value.length; i++) {
+          const _id = recommendQuestionRef.value[i].id()
+          if (_id === id) {
+            recommendQuestionRef.value[i].getRecommendQuestions()
+            break
           }
+        }
+      } else {
+        recommendQuestionRef.value.getRecommendQuestions()
       }
     }
-  }
+  })
 }
 
 onMounted(() => {
@@ -549,7 +508,7 @@ const chartAnswerRef = ref()
 async function onChartAnswerFinish(id: number) {
   loading.value = false
   isTyping.value = false
-  await getRecommendQuestions(id)
+  getRecommendQuestions(id)
 }
 
 function onChartAnswerError() {