diff --git a/api/system/spec.json b/api/system/spec.json
index 9a50e7635..da5b2fb04 100644
--- a/api/system/spec.json
+++ b/api/system/spec.json
@@ -403,6 +403,13 @@
             "Client ID",
             "Session ID"
         ],
+        "struct": [
+            {
+                "imports": [
+                    "github.com/crusttech/crust/system/types"
+                ]
+            }
+        ],
         "apis": [
             {
                 "name": "list",
@@ -459,7 +466,7 @@
                         },
                         {
                             "name": "kind",
-                            "type": "string",
+                            "type": "types.UserKind",
                             "required": false,
                             "title": "Kind (normal, bot)"
                         }
@@ -501,7 +508,7 @@
                         },
                         {
                             "name": "kind",
-                            "type": "string",
+                            "type": "types.UserKind",
                             "required": false,
                             "title": "Kind (normal, bot)"
                         }
diff --git a/api/system/spec/user.json b/api/system/spec/user.json
index 18d13ab65..82e1d5cc6 100644
--- a/api/system/spec/user.json
+++ b/api/system/spec/user.json
@@ -1,7 +1,13 @@
 {
   "Title": "Users",
   "Interface": "User",
-  "Struct": null,
+  "Struct": [
+    {
+      "imports": [
+        "github.com/crusttech/crust/system/types"
+      ]
+    }
+  ],
   "Parameters": null,
   "Protocol": "",
   "Authentication": [
@@ -67,7 +73,7 @@
             "name": "kind",
             "required": false,
             "title": "Kind (normal, bot)",
-            "type": "string"
+            "type": "types.UserKind"
           }
         ]
       }
@@ -109,7 +115,7 @@
             "name": "kind",
             "required": false,
             "title": "Kind (normal, bot)",
-            "type": "string"
+            "type": "types.UserKind"
           }
         ]
       }
diff --git a/docs/system/README.md b/docs/system/README.md
index c8cdc347e..d276cf6a2 100644
--- a/docs/system/README.md
+++ b/docs/system/README.md
@@ -558,7 +558,7 @@ An organisation may have many roles. Roles may have many channels available. Acc
 | email | string | POST | Email | N/A | YES |
 | name | string | POST | Name | N/A | NO |
 | handle | string | POST | Handle | N/A | NO |
-| kind | string | POST | Kind (normal, bot) | N/A | NO |
+| kind | types.UserKind | POST | Kind (normal, bot) | N/A | NO |
 
 ## Update user details
 
@@ -576,7 +576,7 @@ An organisation may have many roles. Roles may have many channels available. Acc
 | email | string | POST | Email | N/A | YES |
 | name | string | POST | Name | N/A | YES |
 | handle | string | POST | Handle | N/A | NO |
-| kind | string | POST | Kind (normal, bot) | N/A | NO |
+| kind | types.UserKind | POST | Kind (normal, bot) | N/A | NO |
 
 ## Read user details and memberships
 
diff --git a/system/rest/request/user.go b/system/rest/request/user.go
index 2d1e09d17..7b2597ea6 100644
--- a/system/rest/request/user.go
+++ b/system/rest/request/user.go
@@ -25,6 +25,8 @@ import (
 
 	"github.com/go-chi/chi"
 	"github.com/pkg/errors"
+
+	"github.com/crusttech/crust/system/types"
 )
 
 var _ = chi.URLParam
@@ -91,7 +93,7 @@ type UserCreate struct {
 	Email  string
 	Name   string
 	Handle string
-	Kind   string
+	Kind   types.UserKind
 }
 
 func NewUserCreate() *UserCreate {
@@ -139,7 +141,7 @@ func (usReq *UserCreate) Fill(r *http.Request) (err error) {
 	}
 	if val, ok := post["kind"]; ok {
 
-		usReq.Kind = val
+		usReq.Kind = types.UserKind(val)
 	}
 
 	return err
@@ -153,7 +155,7 @@ type UserUpdate struct {
 	Email  string
 	Name   string
 	Handle string
-	Kind   string
+	Kind   types.UserKind
 }
 
 func NewUserUpdate() *UserUpdate {
@@ -202,7 +204,7 @@ func (usReq *UserUpdate) Fill(r *http.Request) (err error) {
 	}
 	if val, ok := post["kind"]; ok {
 
-		usReq.Kind = val
+		usReq.Kind = types.UserKind(val)
 	}
 
 	return err
diff --git a/system/types/user.go b/system/types/user.go
index 6f1d84321..eeed22856 100644
--- a/system/types/user.go
+++ b/system/types/user.go
@@ -1,9 +1,11 @@
 package types
 
 import (
+	"database/sql/driver"
+	"encoding/json"
 	"time"
 
-	"github.com/jmoiron/sqlx/types"
+	"github.com/pkg/errors"
 	"golang.org/x/crypto/bcrypt"
 
 	"github.com/crusttech/crust/internal/rules"
@@ -11,14 +13,15 @@ import (
 
 type (
 	User struct {
-		ID       uint64         `json:"userID,string" db:"id"`
-		Username string         `json:"username" db:"username"`
-		Email    string         `json:"email" db:"email"`
-		Name     string         `json:"name" db:"name"`
-		Handle   string         `json:"handle" db:"handle"`
-		Kind     string         `json:"kind" db:"kind"`
-		SatosaID string         `json:"-" db:"satosa_id"`
-		Meta     types.JSONText `json:"-" db:"meta"`
+		ID       uint64   `json:"userID,string" db:"id"`
+		Username string   `json:"username" db:"username"`
+		Email    string   `json:"email" db:"email"`
+		Name     string   `json:"name" db:"name"`
+		Handle   string   `json:"handle" db:"handle"`
+		Kind     UserKind `json:"kind" db:"kind"`
+		SatosaID string   `json:"-" db:"satosa_id"`
+
+		Meta *UserMeta `json:"meta" db:"meta"`
 
 		OrganisationID uint64 `json:"organisationID,string" db:"rel_organisation"`
 		RelatedUserID  uint64 `json:"relatedUserID,string" db:"rel_user_id"`
@@ -34,12 +37,23 @@ type (
 		Roles []*Role `json:"roles,omitempty" db:"-"`
 	}
 
+	UserMeta struct {
+		Avatar string `json:"avatar,omitempty"`
+	}
+
 	UserFilter struct {
 		Query    string
 		Email    string
 		Username string
 		OrderBy  string
 	}
+
+	UserKind string
+)
+
+const (
+	NormalUser UserKind = ""
+	BotUser             = "bot"
 )
 
 func (u *User) Valid() bool {
@@ -68,3 +82,21 @@ func (u *User) GeneratePassword(password string) error {
 func (u *User) PermissionResource() rules.Resource {
 	return UserPermissionResource.AppendID(u.ID)
 }
+
+func (meta *UserMeta) Scan(value interface{}) error {
+	switch value.(type) {
+	case nil:
+		*meta = UserMeta{}
+		return nil
+	case []uint8:
+		if err := json.Unmarshal(value.([]byte), meta); err != nil {
+			return errors.Wrapf(err, "Can not scan '%v' into User.Meta", value)
+		}
+		return nil
+	}
+	return errors.Errorf("User.Meta: unknown type %T, expected []uint8", value)
+}
+
+func (meta *UserMeta) Value() (driver.Value, error) {
+	return json.Marshal(meta)
+}