diff --git a/doc/api.oa3 b/doc/api.oa3
index 881c017b..c8d76dc5 100644
--- a/doc/api.oa3
+++ b/doc/api.oa3
@@ -1944,38 +1944,7 @@ paths:
           description: account disabled
         '500':
           description: internal server error
-          
-  /content/channels/{channelId}/size:
-    get:
-      tags:
-        - content
-      description: Get size object of channel.
-      operationId: get-channel-size
-      security:
-        - bearerAuth: []
-      parameters:
-        - name: channelId
-          in: path
-          description: specified channel id 
-          required: true
-          schema:
-            type: string
-      responses:
-        '200':
-          description: success
-          content:
-            application/json:
-              schema:
-                $ref: '#/components/schemas/ChannelSize'
-        '401':
-          description: invalid password
-        '404':
-          description: channel not found
-        '410':
-          description: account disabled
-        '500':
-          description: internal server error
-          
+                   
   /content/channels/{channelId}/subject/{field}:
     get:
       tags:
@@ -3180,7 +3149,7 @@ components:
         id:
           type: string
         revision:
-          type: string
+          type: int64
         data:
           $ref: '#/components/schemas/ChannelData'
           
@@ -3188,18 +3157,12 @@ components:
       type: object
       required:
         - detailRevision
-        - topicRevision
       properties:
         detailRevision:
           type: integer
           format: int64
-        topicRevision:
-          type: integer
-          format: int64
         channelDetail:
           $ref: '#/components/schemas/ChannelDetail'
-        channelTopics:
-          $ref: '#/components/schemas/ChannelSize'
           
     ChannelDetail:
       type: object
@@ -3226,19 +3189,6 @@ components:
           items:
             type: string
           
-    ChannelSize:
-      type: object
-      required:
-        - topicCount
-        - topicUpdated
-      properties:
-        topicCount:
-          type: integer
-          format: int32
-        topicUpdated:
-          type: integer
-          format: int64
-          
     ChannelGroups:
       type: object
       required:
diff --git a/net/server/internal/api_addChannel.go b/net/server/internal/api_addChannel.go
new file mode 100644
index 00000000..9b935d13
--- /dev/null
+++ b/net/server/internal/api_addChannel.go
@@ -0,0 +1,56 @@
+package databag
+
+import (
+  "net/http"
+  "gorm.io/gorm"
+  "github.com/google/uuid"
+  "databag/internal/store"
+)
+
+func AddChannel(w http.ResponseWriter, r *http.Request) {
+
+  account, code, err := BearerAppToken(r, false)
+  if err != nil {
+    ErrResponse(w, code, err)
+    return
+  }
+
+  var subject Subject
+  if err := ParseRequest(r, w, &subject); err != nil {
+    ErrResponse(w, http.StatusBadRequest, err)
+    return
+  }
+
+  slot := &store.ChannelSlot{}
+  err = store.DB.Transaction(func(tx *gorm.DB) error {
+
+    channel := &store.Channel{}
+    channel.Data = subject.Data
+    channel.DataType = subject.DataType
+    if res := tx.Save(channel).Error; res != nil {
+      return res
+    }
+
+    slot.ChannelSlotId = uuid.New().String()
+    slot.AccountID = account.ID
+    slot.ChannelID = channel.ID
+    slot.Revision = account.ChannelRevision + 1
+    slot.Channel = channel
+    if res := tx.Save(slot).Error; res != nil {
+      return res
+    }
+    if res := tx.Model(&account).Update("channel_revision", account.ChannelRevision + 1).Error; res != nil {
+      return res
+    }
+    return nil
+  })
+  if err != nil {
+    ErrResponse(w, http.StatusInternalServerError, err)
+    return
+  }
+
+  SetStatus(account)
+  WriteResponse(w, getChannelModel(slot, true, true))
+}
+
+
diff --git a/net/server/internal/api_content.go b/net/server/internal/api_content.go
index 4babd62b..88a0eb33 100644
--- a/net/server/internal/api_content.go
+++ b/net/server/internal/api_content.go
@@ -13,11 +13,6 @@ import (
 	"net/http"
 )
 
-func AddChannel(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
-	w.WriteHeader(http.StatusOK)
-}
-
 func AddChannelAsset(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
 	w.WriteHeader(http.StatusOK)
diff --git a/net/server/internal/modelUtil.go b/net/server/internal/modelUtil.go
index 9b19b4ea..956adb97 100644
--- a/net/server/internal/modelUtil.go
+++ b/net/server/internal/modelUtil.go
@@ -145,4 +145,63 @@ func getArticleModel(slot *store.ArticleSlot, showData bool, showGroups bool) *A
   }
 }
 
+func getChannelRevisionModel(slot *store.ChannelSlot, showData bool, showGroups bool) *Channel {
+
+  if !showData || slot.Channel == nil {
+    return &Channel{
+      Id: slot.ChannelSlotId,
+      Revision: slot.Revision,
+    }
+  }
+
+  return &Channel{
+    Id: slot.ChannelSlotId,
+    Revision: slot.Revision,
+    Data: &ChannelData {
+      DetailRevision: slot.Channel.DetailRevision,
+    },
+  }
+}
+
+func getChannelModel(slot *store.ChannelSlot, showData bool, showGroups bool) *Channel {
+
+  if !showData || slot.Channel == nil {
+    return &Channel{
+      Id: slot.ChannelSlotId,
+      Revision: slot.Revision,
+    }
+  }
+
+  var channelGroups *ChannelGroups
+  if showGroups {
+    var groups []string;
+    for _, group := range slot.Channel.Groups {
+      groups = append(groups, group.GroupSlot.GroupSlotId)
+    }
+    channelGroups = &ChannelGroups{ Groups: groups }
+  }
+
+  var cards []string
+  for _, card := range slot.Channel.Cards {
+    cards = append(cards, card.CardSlot.CardSlotId)
+  }
+
+  return &Channel{
+    Id: slot.ChannelSlotId,
+    Revision: slot.Revision,
+    Data: &ChannelData {
+      DetailRevision: slot.Channel.DetailRevision,
+      ChannelDetail: &ChannelDetail{
+        DataType: slot.Channel.DataType,
+        Data: slot.Channel.Data,
+        Created: slot.Channel.Created,
+        Updated: slot.Channel.Updated,
+        Groups: channelGroups,
+        Cards: cards,
+      },
+    },
+  }
+}
+
+
 
diff --git a/net/server/internal/models.go b/net/server/internal/models.go
index 64f73314..8a28d119 100644
--- a/net/server/internal/models.go
+++ b/net/server/internal/models.go
@@ -149,7 +149,7 @@ type Channel struct {
 
 	Id string `json:"id"`
 
-	Revision string `json:"revision"`
+	Revision int64 `json:"revision"`
 
 	Data *ChannelData `json:"data"`
 }
@@ -158,11 +158,7 @@ type ChannelData struct {
 
 	DetailRevision int64 `json:"detailRevision"`
 
-	TopicRevision int64 `json:"topicRevision"`
-
 	ChannelDetail *ChannelDetail `json:"channelDetail,omitempty"`
-
-	ChannelTopics *ChannelSize `json:"channelTopics,omitempty"`
 }
 
 type ChannelDetail struct {
@@ -185,13 +181,6 @@ type ChannelGroups struct {
 	Groups []string `json:"groups"`
 }
 
-type ChannelSize struct {
-
-	TopicCount int32 `json:"topicCount"`
-
-	TopicUpdated int64 `json:"topicUpdated"`
-}
-
 type Claim struct {
 
 	Token string `json:"token"`
diff --git a/net/server/internal/routers.go b/net/server/internal/routers.go
index fba08b96..e87eec00 100644
--- a/net/server/internal/routers.go
+++ b/net/server/internal/routers.go
@@ -551,13 +551,6 @@ var routes = Routes{
 		GetChannelDetail,
 	},
 
-	Route{
-		"GetChannelSize",
-		strings.ToUpper("Get"),
-		"/content/channels/{channelId}/size",
-		GetChannelSize,
-	},
-
 	Route{
 		"GetChannelSubjectField",
 		strings.ToUpper("Get"),
diff --git a/net/server/internal/store/schema.go b/net/server/internal/store/schema.go
index f888b61d..afbfae83 100644
--- a/net/server/internal/store/schema.go
+++ b/net/server/internal/store/schema.go
@@ -196,11 +196,9 @@ type Channel struct {
   ID                uint            `gorm:"primaryKey;not null;unique;autoIncrement"`
   DetailRevision    int64           `gorm:"not null"`
   DataType          string          `gorm:"index"`
+  Data              string
   Created           int64           `gorm:"autoCreateTime"`
   Updated           int64           `gorm:"autoUpdateTime"`
-  SizeRevision      int64           `gorm:"not null"`
-  TopicUpdated      int64
-  TopicCount        int64
   Groups            []Group         `gorm:"many2many:channel_groups;"`
   Cards             []Card          `gorm:"many2many:channel_cards;"`
   ChannelSlot       ChannelSlot
diff --git a/net/server/internal/ucTopicShare_test.go b/net/server/internal/ucTopicShare_test.go
new file mode 100644
index 00000000..2d008e4c
--- /dev/null
+++ b/net/server/internal/ucTopicShare_test.go
@@ -0,0 +1,14 @@
+package databag
+
+import (
+  "testing"
+  "github.com/stretchr/testify/assert"
+)
+
+func TestTopicShare(t *testing.T) {
+
+  // setup testing group
+  set, err := AddTestGroup("topicshare")
+  assert.NoError(t, err)
+  PrintMsg(set)
+}