diff --git a/api/sam/spec.json b/api/sam/spec.json
index a0376dcde..778f7a343 100644
--- a/api/sam/spec.json
+++ b/api/sam/spec.json
@@ -126,6 +126,46 @@
           ]
         }
       },
+      {
+        "name": "setFlag",
+        "method": "PUT",
+        "path": "/{channelID}/flag",
+        "title": "Update channel membership flag",
+        "parameters": {
+          "path": [
+            {
+              "type": "uint64",
+              "name": "channelID",
+              "required": true,
+              "title": "Channel ID"
+            }
+          ],
+          "post": [
+            {
+              "type": "string",
+              "name": "flag",
+              "required": true,
+              "title": "Valid values: pinned, hidden, ignored"
+            }
+          ]
+        }
+      },
+      {
+        "name": "removeFlag",
+        "method": "DELETE",
+        "path": "/{channelID}/flag",
+        "title": "Remove channel membership flag",
+        "parameters": {
+          "path": [
+            {
+              "type": "uint64",
+              "name": "channelID",
+              "required": true,
+              "title": "Channel ID"
+            }
+          ]
+        }
+      },
       {
         "name": "read",
         "method": "GET",
diff --git a/api/sam/spec/channel.json b/api/sam/spec/channel.json
index b8383dc94..7bbea5aa2 100644
--- a/api/sam/spec/channel.json
+++ b/api/sam/spec/channel.json
@@ -128,6 +128,46 @@
         ]
       }
     },
+    {
+      "Name": "setFlag",
+      "Method": "PUT",
+      "Title": "Update channel membership flag",
+      "Path": "/{channelID}/flag",
+      "Parameters": {
+        "path": [
+          {
+            "name": "channelID",
+            "required": true,
+            "title": "Channel ID",
+            "type": "uint64"
+          }
+        ],
+        "post": [
+          {
+            "name": "flag",
+            "required": true,
+            "title": "Valid values: pinned, hidden, ignored",
+            "type": "string"
+          }
+        ]
+      }
+    },
+    {
+      "Name": "removeFlag",
+      "Method": "DELETE",
+      "Title": "Remove channel membership flag",
+      "Path": "/{channelID}/flag",
+      "Parameters": {
+        "path": [
+          {
+            "name": "channelID",
+            "required": true,
+            "title": "Channel ID",
+            "type": "uint64"
+          }
+        ]
+      }
+    },
     {
       "Name": "read",
       "Method": "GET",
diff --git a/docs/sam/README.md b/docs/sam/README.md
index f13a3d044..51020a62c 100644
--- a/docs/sam/README.md
+++ b/docs/sam/README.md
@@ -102,6 +102,35 @@ A channel is a representation of a sequence of messages. It has meta data like c
 | channelID | uint64 | PATH | Channel ID | N/A | YES |
 | state | string | POST | Valid values: delete, undelete, archive, unarchive | N/A | YES |
 
+## Update channel membership flag
+
+#### Method
+
+| URI | Protocol | Method | Authentication |
+| --- | -------- | ------ | -------------- |
+| `/channels/{channelID}/flag` | HTTP/S | PUT | Client ID, Session ID |
+
+#### Request parameters
+
+| Parameter | Type | Method | Description | Default | Required? |
+| --------- | ---- | ------ | ----------- | ------- | --------- |
+| channelID | uint64 | PATH | Channel ID | N/A | YES |
+| flag | string | POST | Valid values: pinned, hidden, ignored | N/A | YES |
+
+## Remove channel membership flag
+
+#### Method
+
+| URI | Protocol | Method | Authentication |
+| --- | -------- | ------ | -------------- |
+| `/channels/{channelID}/flag` | HTTP/S | DELETE | Client ID, Session ID |
+
+#### Request parameters
+
+| Parameter | Type | Method | Description | Default | Required? |
+| --------- | ---- | ------ | ----------- | ------- | --------- |
+| channelID | uint64 | PATH | Channel ID | N/A | YES |
+
 ## Read channel details
 
 #### Method
diff --git a/internal/payload/outgoing.go b/internal/payload/outgoing.go
index a758b9d8a..a84312cd5 100644
--- a/internal/payload/outgoing.go
+++ b/internal/payload/outgoing.go
@@ -121,14 +121,21 @@ func MessagePinRemoved(f *samTypes.MessageFlag) *outgoing.MessagePinRemoved {
 }
 
 func Channel(ch *samTypes.Channel) *outgoing.Channel {
+	var flag = samTypes.ChannelMembershipFlagNone
+
+	if ch.Member != nil {
+		flag = ch.Member.Flag
+	}
+
 	return &outgoing.Channel{
-		ID:            Uint64toa(ch.ID),
-		Name:          ch.Name,
-		LastMessageID: Uint64toa(ch.LastMessageID),
-		Topic:         ch.Topic,
-		Type:          string(ch.Type),
-		Members:       Uint64stoa(ch.Members),
-		Unread:        Unread(ch.Unread),
+		ID:             Uint64toa(ch.ID),
+		Name:           ch.Name,
+		LastMessageID:  Uint64toa(ch.LastMessageID),
+		Topic:          ch.Topic,
+		Type:           string(ch.Type),
+		MembershipFlag: string(flag),
+		Members:        Uint64stoa(ch.Members),
+		Unread:         Unread(ch.Unread),
 
 		CanJoin:           ch.CanJoin,
 		CanPart:           ch.CanPart,
diff --git a/internal/payload/outgoing/channel.go b/internal/payload/outgoing/channel.go
index 08a948597..f221bb2a1 100644
--- a/internal/payload/outgoing/channel.go
+++ b/internal/payload/outgoing/channel.go
@@ -31,13 +31,14 @@ type (
 
 	Channel struct {
 		// Channel to part (nil) for ALL channels
-		ID            string   `json:"ID"`
-		Name          string   `json:"name"`
-		Topic         string   `json:"topic"`
-		Type          string   `json:"type"`
-		LastMessageID string   `json:"lastMessageID"`
-		Members       []string `json:"members,omitempty"`
-		Unread        *Unread  `json:"unread,omitempty"`
+		ID             string   `json:"ID"`
+		Name           string   `json:"name"`
+		Topic          string   `json:"topic"`
+		Type           string   `json:"type"`
+		LastMessageID  string   `json:"lastMessageID"`
+		Unread         *Unread  `json:"unread,omitempty"`
+		Members        []string `json:"members,omitempty"`
+		MembershipFlag string   `json:"membershipFlag"`
 
 		CanJoin           bool `json:"canJoin"`
 		CanPart           bool `json:"canPart"`
diff --git a/sam/db/mysql/statik.go b/sam/db/mysql/statik.go
index ba7f68b0a..1b384a3d8 100644
--- a/sam/db/mysql/statik.go
+++ b/sam/db/mysql/statik.go
@@ -8,7 +8,7 @@ import (
 )
 
 func Data() string {
-	return "PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1a\x00	\x0020180704080000.base.up.sqlUT\x05\x00\x01\x80Cm8-- Keeps all known channels\nCREATE TABLE channels (\n  id               BIGINT UNSIGNED NOT NULL,\n  name             TEXT            NOT NULL, -- display name of the channel\n  topic            TEXT            NOT NULL,\n  meta             JSON            NOT NULL,\n\n  type             ENUM ('private', 'public', 'group') NOT NULL DEFAULT 'public',\n\n  rel_organisation BIGINT UNSIGNED NOT NULL REFERENCES organisation(id),\n  rel_creator      BIGINT UNSIGNED NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n  archived_at      DATETIME            NULL,\n  deleted_at       DATETIME            NULL, -- channel soft delete\n\n  rel_last_message BIGINT UNSIGNED NOT NULL DEFAULT 0,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\n-- handles channel membership\nCREATE TABLE channel_members (\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  type             ENUM ('owner', 'member', 'invitee') NOT NULL DEFAULT 'member',\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n\n  PRIMARY KEY (rel_channel, rel_user)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE channel_views (\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  -- timestamp of last view, should be enough to find out which messaghr\n  viewed_at        DATETIME        NOT NULL DEFAULT NOW(),\n\n  -- new messages count since last view\n  new_since        INT    UNSIGNED NOT NULL DEFAULT 0,\n\n  PRIMARY KEY (rel_user, rel_channel)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE channel_pins (\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  rel_message      BIGINT UNSIGNED NOT NULL REFERENCES messages(id),\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (rel_channel, rel_message)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE messages (\n  id               BIGINT UNSIGNED NOT NULL,\n  type             TEXT,\n  message          TEXT            NOT NULL,\n  meta             JSON,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  reply_to         BIGINT UNSIGNED     NULL REFERENCES messages(id),\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n  deleted_at       DATETIME            NULL,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE reactions (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  rel_message      BIGINT UNSIGNED NOT NULL REFERENCES messages(id),\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  reaction         TEXT            NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE attachments (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  url              VARCHAR(512),\n  preview_url      VARCHAR(512),\n\n  size             INT    UNSIGNED,\n  mimetype         VARCHAR(255),\n  name             TEXT,\n\n  meta             JSON,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n  deleted_at       DATETIME            NULL,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE message_attachment (\n  rel_message      BIGINT UNSIGNED NOT NULL REFERENCES messages(id),\n  rel_attachment   BIGINT UNSIGNED NOT NULL REFERENCES attachment(id),\n\n  PRIMARY KEY (rel_message)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE event_queue (\n  id               BIGINT UNSIGNED NOT NULL,\n  origin           BIGINT UNSIGNED NOT NULL,\n  subscriber       TEXT,\n  payload          JSON,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE event_queue_synced (\n  origin           BIGINT UNSIGNED NOT NULL,\n  rel_last         BIGINT UNSIGNED NOT NULL,\n\n  PRIMARY KEY (origin)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\nPK\x07\x08\xd5\x9c\xef\x89V\x10\x00\x00V\x10\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00$\x00	\x0020181009080000.altering_types.up.sqlUT\x05\x00\x01\x80Cm8update channels set type = 'group' where type = 'direct';\nalter table channels CHANGE type type  enum('private', 'public', 'group');\nalter table channel_members CHANGE type type  enum('owner', 'member', 'invitee');\nPK\x07\x08E1\xf5\xa4\xd7\x00\x00\x00\xd7\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00#\x00	\x0020181013080000.channel_views.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE channel_views DROP viewed_at;\nALTER TABLE channel_views ADD rel_last_message_id BIGINT UNSIGNED;\nALTER TABLE channel_views CHANGE new_since new_messages_count INT UNSIGNED;\n\n-- Table structure after these changes:\n-- +---------------------+---------------------+------+-----+---------+-------+\n-- | Field               | Type                | Null | Key | Default | Extra |\n-- +---------------------+---------------------+------+-----+---------+-------+\n-- | rel_channel         | bigint(20) unsigned | NO   | PRI | NULL    |       |\n-- | rel_user            | bigint(20) unsigned | NO   | PRI | NULL    |       |\n-- | rel_last_message_id | bigint(20) unsigned | YES  |     | NULL    |       |\n-- | new_messages_count  | int(10) unsigned    | NO   |     | 0       |       |\n-- +---------------------+---------------------+------+-----+---------+-------+\n\n-- Prefill with data\nINSERT INTO channel_views (rel_channel, rel_user, rel_last_message_id)\n  SELECT cm.rel_channel, cm.rel_user, max(m.ID)\n    FROM channel_members AS cm INNER JOIN messages AS m ON (m.rel_channel = cm.rel_channel)\n  GROUP BY cm.rel_channel, cm.rel_user;\n\nPK\x07\x08`\xcbP\xf9t\x04\x00\x00t\x04\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1d\x00	\x0020181013080000.replies.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE messages CHANGE reply_to reply_to BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE messages ADD replies INT UNSIGNED NOT NULL DEFAULT 0;\nPK\x07\x08m\xedWA\x94\x00\x00\x00\x94\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00(\x00	\x0020181101080000.pins_and_reactions.up.sqlUT\x05\x00\x01\x80Cm8DROP TABLE channel_pins;\nDROP TABLE reactions;\n\nCREATE TABLE message_flags (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_channel      BIGINT UNSIGNED NOT NULL,\n  rel_message      BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  flag             TEXT,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\nPK\x07\x08eA\x1eo\x90\x01\x00\x00\x90\x01\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1e\x00	\x0020181107080000.mentions.up.sqlUT\x05\x00\x01\x80Cm8CREATE TABLE mentions (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_channel      BIGINT UNSIGNED NOT NULL,\n  rel_message      BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  rel_mentioned_by BIGINT UNSIGNED NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE INDEX lookup_mentions ON mentions (rel_mentioned_by)\nPK\x07\x08\xfb\xe8\x9b\x98\xac\x01\x00\x00\xac\x01\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1d\x00	\x0020181115080000.unreads.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE channel_views RENAME TO unreads;\n\nALTER TABLE unreads ADD     rel_reply_to                        BIGINT UNSIGNED NOT NULL AFTER rel_channel;\nALTER TABLE unreads CHANGE rel_channel         rel_channel      BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE unreads CHANGE rel_user            rel_user         BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE unreads CHANGE rel_last_message_id rel_last_message BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE unreads CHANGE new_messages_count  count            INT    UNSIGNED NOT NULL DEFAULT 0;\n\nPK\x07\x08jf1Q+\x02\x00\x00+\x02\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00*\x00	\x0020181124173028.remove_events_tables.up.sqlUT\x05\x00\x01\x80Cm8DROP TABLE event_queue;\nDROP TABLE event_queue_synced;PK\x07\x08\xdd.y06\x00\x00\x006\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00)\x00	\x0020181205153145.messages-to-utf8mb4.up.sqlUT\x05\x00\x01\x80Cm8alter table messages convert to character set utf8mb4 collate utf8mb4_unicode_ci;PK\x07\x08Ig\xbfOQ\x00\x00\x00Q\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0e\x00	\x00migrations.sqlUT\x05\x00\x01\x80Cm8CREATE TABLE IF NOT EXISTS `migrations` (\n `project` varchar(16) NOT NULL COMMENT 'sam, crm, ...',\n `filename` varchar(255) NOT NULL COMMENT 'yyyymmddHHMMSS.sql',\n `statement_index` int(11) NOT NULL COMMENT 'Statement number from SQL file',\n `status` TEXT NOT NULL COMMENT 'ok or full error message',\n PRIMARY KEY (`project`,`filename`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nPK\x07\x08\x0d\xa5T2x\x01\x00\x00x\x01\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x00	\x00new.shUT\x05\x00\x01\x80Cm8#!/bin/bash\ntouch $(date +%Y%m%d%H%M%S).up.sqlPK\x07\x08s\xd4N*.\x00\x00\x00.\x00\x00\x00PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\xd5\x9c\xef\x89V\x10\x00\x00V\x10\x00\x00\x1a\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x00\x00\x00\x0020180704080000.base.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(E1\xf5\xa4\xd7\x00\x00\x00\xd7\x00\x00\x00$\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xa7\x10\x00\x0020181009080000.altering_types.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(`\xcbP\xf9t\x04\x00\x00t\x04\x00\x00#\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xd9\x11\x00\x0020181013080000.channel_views.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(m\xedWA\x94\x00\x00\x00\x94\x00\x00\x00\x1d\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xa7\x16\x00\x0020181013080000.replies.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(eA\x1eo\x90\x01\x00\x00\x90\x01\x00\x00(\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x8f\x17\x00\x0020181101080000.pins_and_reactions.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\xfb\xe8\x9b\x98\xac\x01\x00\x00\xac\x01\x00\x00\x1e\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81~\x19\x00\x0020181107080000.mentions.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(jf1Q+\x02\x00\x00+\x02\x00\x00\x1d\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x7f\x1b\x00\x0020181115080000.unreads.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\xdd.y06\x00\x00\x006\x00\x00\x00*\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xfe\x1d\x00\x0020181124173028.remove_events_tables.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(Ig\xbfOQ\x00\x00\x00Q\x00\x00\x00)\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x95\x1e\x00\x0020181205153145.messages-to-utf8mb4.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\x0d\xa5T2x\x01\x00\x00x\x01\x00\x00\x0e\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81F\x1f\x00\x00migrations.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(s\xd4N*.\x00\x00\x00.\x00\x00\x00\x06\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xed\x81\x03!\x00\x00new.shUT\x05\x00\x01\x80Cm8PK\x05\x06\x00\x00\x00\x00\x0b\x00\x0b\x00\xa5\x03\x00\x00n!\x00\x00\x00\x00"
+	return "PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1a\x00	\x0020180704080000.base.up.sqlUT\x05\x00\x01\x80Cm8-- Keeps all known channels\nCREATE TABLE channels (\n  id               BIGINT UNSIGNED NOT NULL,\n  name             TEXT            NOT NULL, -- display name of the channel\n  topic            TEXT            NOT NULL,\n  meta             JSON            NOT NULL,\n\n  type             ENUM ('private', 'public', 'group') NOT NULL DEFAULT 'public',\n\n  rel_organisation BIGINT UNSIGNED NOT NULL REFERENCES organisation(id),\n  rel_creator      BIGINT UNSIGNED NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n  archived_at      DATETIME            NULL,\n  deleted_at       DATETIME            NULL, -- channel soft delete\n\n  rel_last_message BIGINT UNSIGNED NOT NULL DEFAULT 0,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\n-- handles channel membership\nCREATE TABLE channel_members (\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  type             ENUM ('owner', 'member', 'invitee') NOT NULL DEFAULT 'member',\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n\n  PRIMARY KEY (rel_channel, rel_user)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE channel_views (\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  -- timestamp of last view, should be enough to find out which messaghr\n  viewed_at        DATETIME        NOT NULL DEFAULT NOW(),\n\n  -- new messages count since last view\n  new_since        INT    UNSIGNED NOT NULL DEFAULT 0,\n\n  PRIMARY KEY (rel_user, rel_channel)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE channel_pins (\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  rel_message      BIGINT UNSIGNED NOT NULL REFERENCES messages(id),\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (rel_channel, rel_message)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE messages (\n  id               BIGINT UNSIGNED NOT NULL,\n  type             TEXT,\n  message          TEXT            NOT NULL,\n  meta             JSON,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  reply_to         BIGINT UNSIGNED     NULL REFERENCES messages(id),\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n  deleted_at       DATETIME            NULL,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE reactions (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  rel_message      BIGINT UNSIGNED NOT NULL REFERENCES messages(id),\n  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),\n  reaction         TEXT            NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE attachments (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n\n  url              VARCHAR(512),\n  preview_url      VARCHAR(512),\n\n  size             INT    UNSIGNED,\n  mimetype         VARCHAR(255),\n  name             TEXT,\n\n  meta             JSON,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n  updated_at       DATETIME            NULL,\n  deleted_at       DATETIME            NULL,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE message_attachment (\n  rel_message      BIGINT UNSIGNED NOT NULL REFERENCES messages(id),\n  rel_attachment   BIGINT UNSIGNED NOT NULL REFERENCES attachment(id),\n\n  PRIMARY KEY (rel_message)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE event_queue (\n  id               BIGINT UNSIGNED NOT NULL,\n  origin           BIGINT UNSIGNED NOT NULL,\n  subscriber       TEXT,\n  payload          JSON,\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE TABLE event_queue_synced (\n  origin           BIGINT UNSIGNED NOT NULL,\n  rel_last         BIGINT UNSIGNED NOT NULL,\n\n  PRIMARY KEY (origin)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\nPK\x07\x08\xd5\x9c\xef\x89V\x10\x00\x00V\x10\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00$\x00	\x0020181009080000.altering_types.up.sqlUT\x05\x00\x01\x80Cm8update channels set type = 'group' where type = 'direct';\nalter table channels CHANGE type type  enum('private', 'public', 'group');\nalter table channel_members CHANGE type type  enum('owner', 'member', 'invitee');\nPK\x07\x08E1\xf5\xa4\xd7\x00\x00\x00\xd7\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00#\x00	\x0020181013080000.channel_views.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE channel_views DROP viewed_at;\nALTER TABLE channel_views ADD rel_last_message_id BIGINT UNSIGNED;\nALTER TABLE channel_views CHANGE new_since new_messages_count INT UNSIGNED;\n\n-- Table structure after these changes:\n-- +---------------------+---------------------+------+-----+---------+-------+\n-- | Field               | Type                | Null | Key | Default | Extra |\n-- +---------------------+---------------------+------+-----+---------+-------+\n-- | rel_channel         | bigint(20) unsigned | NO   | PRI | NULL    |       |\n-- | rel_user            | bigint(20) unsigned | NO   | PRI | NULL    |       |\n-- | rel_last_message_id | bigint(20) unsigned | YES  |     | NULL    |       |\n-- | new_messages_count  | int(10) unsigned    | NO   |     | 0       |       |\n-- +---------------------+---------------------+------+-----+---------+-------+\n\n-- Prefill with data\nINSERT INTO channel_views (rel_channel, rel_user, rel_last_message_id)\n  SELECT cm.rel_channel, cm.rel_user, max(m.ID)\n    FROM channel_members AS cm INNER JOIN messages AS m ON (m.rel_channel = cm.rel_channel)\n  GROUP BY cm.rel_channel, cm.rel_user;\n\nPK\x07\x08`\xcbP\xf9t\x04\x00\x00t\x04\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1d\x00	\x0020181013080000.replies.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE messages CHANGE reply_to reply_to BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE messages ADD replies INT UNSIGNED NOT NULL DEFAULT 0;\nPK\x07\x08m\xedWA\x94\x00\x00\x00\x94\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00(\x00	\x0020181101080000.pins_and_reactions.up.sqlUT\x05\x00\x01\x80Cm8DROP TABLE channel_pins;\nDROP TABLE reactions;\n\nCREATE TABLE message_flags (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_channel      BIGINT UNSIGNED NOT NULL,\n  rel_message      BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  flag             TEXT,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\nPK\x07\x08eA\x1eo\x90\x01\x00\x00\x90\x01\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1e\x00	\x0020181107080000.mentions.up.sqlUT\x05\x00\x01\x80Cm8CREATE TABLE mentions (\n  id               BIGINT UNSIGNED NOT NULL,\n  rel_channel      BIGINT UNSIGNED NOT NULL,\n  rel_message      BIGINT UNSIGNED NOT NULL,\n  rel_user         BIGINT UNSIGNED NOT NULL,\n  rel_mentioned_by BIGINT UNSIGNED NOT NULL,\n\n  created_at       DATETIME        NOT NULL DEFAULT NOW(),\n\n  PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nCREATE INDEX lookup_mentions ON mentions (rel_mentioned_by)\nPK\x07\x08\xfb\xe8\x9b\x98\xac\x01\x00\x00\xac\x01\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1d\x00	\x0020181115080000.unreads.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE channel_views RENAME TO unreads;\n\nALTER TABLE unreads ADD     rel_reply_to                        BIGINT UNSIGNED NOT NULL AFTER rel_channel;\nALTER TABLE unreads CHANGE rel_channel         rel_channel      BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE unreads CHANGE rel_user            rel_user         BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE unreads CHANGE rel_last_message_id rel_last_message BIGINT UNSIGNED NOT NULL DEFAULT 0;\nALTER TABLE unreads CHANGE new_messages_count  count            INT    UNSIGNED NOT NULL DEFAULT 0;\n\nPK\x07\x08jf1Q+\x02\x00\x00+\x02\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00*\x00	\x0020181124173028.remove_events_tables.up.sqlUT\x05\x00\x01\x80Cm8DROP TABLE event_queue;\nDROP TABLE event_queue_synced;PK\x07\x08\xdd.y06\x00\x00\x006\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00)\x00	\x0020181205153145.messages-to-utf8mb4.up.sqlUT\x05\x00\x01\x80Cm8alter table messages convert to character set utf8mb4 collate utf8mb4_unicode_ci;PK\x07\x08Ig\xbfOQ\x00\x00\x00Q\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00&\x00	\x0020190122191150.membership-flags.up.sqlUT\x05\x00\x01\x80Cm8ALTER TABLE channel_members ADD flag ENUM ('pinned', 'hidden', 'ignored', '') NOT NULL DEFAULT '' AFTER `type`;\nPK\x07\x084\xfb\xe3\xf4p\x00\x00\x00p\x00\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0e\x00	\x00migrations.sqlUT\x05\x00\x01\x80Cm8CREATE TABLE IF NOT EXISTS `migrations` (\n `project` varchar(16) NOT NULL COMMENT 'sam, crm, ...',\n `filename` varchar(255) NOT NULL COMMENT 'yyyymmddHHMMSS.sql',\n `statement_index` int(11) NOT NULL COMMENT 'Statement number from SQL file',\n `status` TEXT NOT NULL COMMENT 'ok or full error message',\n PRIMARY KEY (`project`,`filename`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nPK\x07\x08\x0d\xa5T2x\x01\x00\x00x\x01\x00\x00PK\x03\x04\x14\x00\x08\x00\x00\x00\x00\x00!(\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x00	\x00new.shUT\x05\x00\x01\x80Cm8#!/bin/bash\ntouch $(date +%Y%m%d%H%M%S).up.sqlPK\x07\x08s\xd4N*.\x00\x00\x00.\x00\x00\x00PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\xd5\x9c\xef\x89V\x10\x00\x00V\x10\x00\x00\x1a\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x00\x00\x00\x0020180704080000.base.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(E1\xf5\xa4\xd7\x00\x00\x00\xd7\x00\x00\x00$\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xa7\x10\x00\x0020181009080000.altering_types.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(`\xcbP\xf9t\x04\x00\x00t\x04\x00\x00#\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xd9\x11\x00\x0020181013080000.channel_views.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(m\xedWA\x94\x00\x00\x00\x94\x00\x00\x00\x1d\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xa7\x16\x00\x0020181013080000.replies.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(eA\x1eo\x90\x01\x00\x00\x90\x01\x00\x00(\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x8f\x17\x00\x0020181101080000.pins_and_reactions.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\xfb\xe8\x9b\x98\xac\x01\x00\x00\xac\x01\x00\x00\x1e\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81~\x19\x00\x0020181107080000.mentions.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(jf1Q+\x02\x00\x00+\x02\x00\x00\x1d\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x7f\x1b\x00\x0020181115080000.unreads.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\xdd.y06\x00\x00\x006\x00\x00\x00*\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\xfe\x1d\x00\x0020181124173028.remove_events_tables.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(Ig\xbfOQ\x00\x00\x00Q\x00\x00\x00)\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x95\x1e\x00\x0020181205153145.messages-to-utf8mb4.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(4\xfb\xe3\xf4p\x00\x00\x00p\x00\x00\x00&\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81F\x1f\x00\x0020190122191150.membership-flags.up.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(\x0d\xa5T2x\x01\x00\x00x\x01\x00\x00\x0e\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa4\x81\x13 \x00\x00migrations.sqlUT\x05\x00\x01\x80Cm8PK\x01\x02\x14\x03\x14\x00\x08\x00\x00\x00\x00\x00!(s\xd4N*.\x00\x00\x00.\x00\x00\x00\x06\x00	\x00\x00\x00\x00\x00\x00\x00\x00\x00\xed\x81\xd0!\x00\x00new.shUT\x05\x00\x01\x80Cm8PK\x05\x06\x00\x00\x00\x00\x0c\x00\x0c\x00\x02\x04\x00\x00;\"\x00\x00\x00\x00"
 }
 
 func init() {
diff --git a/sam/db/schema/mysql/20190122191150.membership-flags.up.sql b/sam/db/schema/mysql/20190122191150.membership-flags.up.sql
new file mode 100644
index 000000000..fdbdb36b7
--- /dev/null
+++ b/sam/db/schema/mysql/20190122191150.membership-flags.up.sql
@@ -0,0 +1 @@
+ALTER TABLE channel_members ADD flag ENUM ('pinned', 'hidden', 'ignored', '') NOT NULL DEFAULT '' AFTER `type`;
diff --git a/sam/repository/channel_member.go b/sam/repository/channel_member.go
index 92a209e54..757bf8f44 100644
--- a/sam/repository/channel_member.go
+++ b/sam/repository/channel_member.go
@@ -93,7 +93,7 @@ func (r *channelMember) Create(mod *types.ChannelMember) (*types.ChannelMember,
 func (r *channelMember) Update(mod *types.ChannelMember) (*types.ChannelMember, error) {
 	mod.UpdatedAt = timeNowPtr()
 
-	whitelist := []string{"type", "updated_at", "rel_channel", "rel_user"}
+	whitelist := []string{"type", "flag", "updated_at", "rel_channel", "rel_user"}
 
 	return mod, r.db().UpdatePartial("channel_members", mod, whitelist, "rel_channel", "rel_user")
 }
diff --git a/sam/rest/channel.go b/sam/rest/channel.go
index 556bbdd6c..3f0ea5bc3 100644
--- a/sam/rest/channel.go
+++ b/sam/rest/channel.go
@@ -67,6 +67,19 @@ func (ctrl *Channel) State(ctx context.Context, r *request.ChannelState) (interf
 	return nil, nil
 }
 
+func (ctrl *Channel) SetFlag(ctx context.Context, r *request.ChannelSetFlag) (interface{}, error) {
+	switch r.Flag {
+	case "pinned", "hidden", "ignored":
+		return ctrl.wrap(ctrl.svc.ch.With(ctx).SetFlag(r.ChannelID, types.ChannelMembershipFlag(r.Flag)))
+	}
+
+	return nil, nil
+}
+
+func (ctrl *Channel) RemoveFlag(ctx context.Context, r *request.ChannelRemoveFlag) (interface{}, error) {
+	return ctrl.wrap(ctrl.svc.ch.With(ctx).SetFlag(r.ChannelID, types.ChannelMembershipFlagNone))
+}
+
 func (ctrl *Channel) Read(ctx context.Context, r *request.ChannelRead) (interface{}, error) {
 	return ctrl.wrap(ctrl.svc.ch.With(ctx).FindByID(r.ChannelID))
 }
diff --git a/sam/rest/handlers/channel.go b/sam/rest/handlers/channel.go
index 85a20e02e..3364cf30d 100644
--- a/sam/rest/handlers/channel.go
+++ b/sam/rest/handlers/channel.go
@@ -31,6 +31,8 @@ type ChannelAPI interface {
 	Create(context.Context, *request.ChannelCreate) (interface{}, error)
 	Update(context.Context, *request.ChannelUpdate) (interface{}, error)
 	State(context.Context, *request.ChannelState) (interface{}, error)
+	SetFlag(context.Context, *request.ChannelSetFlag) (interface{}, error)
+	RemoveFlag(context.Context, *request.ChannelRemoveFlag) (interface{}, error)
 	Read(context.Context, *request.ChannelRead) (interface{}, error)
 	Members(context.Context, *request.ChannelMembers) (interface{}, error)
 	Join(context.Context, *request.ChannelJoin) (interface{}, error)
@@ -41,16 +43,18 @@ type ChannelAPI interface {
 
 // HTTP API interface
 type Channel struct {
-	List    func(http.ResponseWriter, *http.Request)
-	Create  func(http.ResponseWriter, *http.Request)
-	Update  func(http.ResponseWriter, *http.Request)
-	State   func(http.ResponseWriter, *http.Request)
-	Read    func(http.ResponseWriter, *http.Request)
-	Members func(http.ResponseWriter, *http.Request)
-	Join    func(http.ResponseWriter, *http.Request)
-	Part    func(http.ResponseWriter, *http.Request)
-	Invite  func(http.ResponseWriter, *http.Request)
-	Attach  func(http.ResponseWriter, *http.Request)
+	List       func(http.ResponseWriter, *http.Request)
+	Create     func(http.ResponseWriter, *http.Request)
+	Update     func(http.ResponseWriter, *http.Request)
+	State      func(http.ResponseWriter, *http.Request)
+	SetFlag    func(http.ResponseWriter, *http.Request)
+	RemoveFlag func(http.ResponseWriter, *http.Request)
+	Read       func(http.ResponseWriter, *http.Request)
+	Members    func(http.ResponseWriter, *http.Request)
+	Join       func(http.ResponseWriter, *http.Request)
+	Part       func(http.ResponseWriter, *http.Request)
+	Invite     func(http.ResponseWriter, *http.Request)
+	Attach     func(http.ResponseWriter, *http.Request)
 }
 
 func NewChannel(ch ChannelAPI) *Channel {
@@ -83,6 +87,20 @@ func NewChannel(ch ChannelAPI) *Channel {
 				return ch.State(r.Context(), params)
 			})
 		},
+		SetFlag: func(w http.ResponseWriter, r *http.Request) {
+			defer r.Body.Close()
+			params := request.NewChannelSetFlag()
+			resputil.JSON(w, params.Fill(r), func() (interface{}, error) {
+				return ch.SetFlag(r.Context(), params)
+			})
+		},
+		RemoveFlag: func(w http.ResponseWriter, r *http.Request) {
+			defer r.Body.Close()
+			params := request.NewChannelRemoveFlag()
+			resputil.JSON(w, params.Fill(r), func() (interface{}, error) {
+				return ch.RemoveFlag(r.Context(), params)
+			})
+		},
 		Read: func(w http.ResponseWriter, r *http.Request) {
 			defer r.Body.Close()
 			params := request.NewChannelRead()
@@ -136,6 +154,8 @@ func (ch *Channel) MountRoutes(r chi.Router, middlewares ...func(http.Handler) h
 			r.Post("/", ch.Create)
 			r.Put("/{channelID}", ch.Update)
 			r.Put("/{channelID}/state", ch.State)
+			r.Put("/{channelID}/flag", ch.SetFlag)
+			r.Delete("/{channelID}/flag", ch.RemoveFlag)
 			r.Get("/{channelID}", ch.Read)
 			r.Get("/{channelID}/members", ch.Members)
 			r.Put("/{channelID}/members/{userID}", ch.Join)
diff --git a/sam/rest/request/channel.go b/sam/rest/request/channel.go
index 121fa78a6..1993388ad 100644
--- a/sam/rest/request/channel.go
+++ b/sam/rest/request/channel.go
@@ -243,6 +243,97 @@ func (c *ChannelState) Fill(r *http.Request) (err error) {
 
 var _ RequestFiller = NewChannelState()
 
+// Channel setFlag request parameters
+type ChannelSetFlag struct {
+	ChannelID uint64 `json:",string"`
+	Flag      string
+}
+
+func NewChannelSetFlag() *ChannelSetFlag {
+	return &ChannelSetFlag{}
+}
+
+func (c *ChannelSetFlag) Fill(r *http.Request) (err error) {
+	if strings.ToLower(r.Header.Get("content-type")) == "application/json" {
+		err = json.NewDecoder(r.Body).Decode(c)
+
+		switch {
+		case err == io.EOF:
+			err = nil
+		case err != nil:
+			return errors.Wrap(err, "error parsing http request body")
+		}
+	}
+
+	if err = r.ParseForm(); err != nil {
+		return err
+	}
+
+	get := map[string]string{}
+	post := map[string]string{}
+	urlQuery := r.URL.Query()
+	for name, param := range urlQuery {
+		get[name] = string(param[0])
+	}
+	postVars := r.Form
+	for name, param := range postVars {
+		post[name] = string(param[0])
+	}
+
+	c.ChannelID = parseUInt64(chi.URLParam(r, "channelID"))
+	if val, ok := post["flag"]; ok {
+
+		c.Flag = val
+	}
+
+	return err
+}
+
+var _ RequestFiller = NewChannelSetFlag()
+
+// Channel removeFlag request parameters
+type ChannelRemoveFlag struct {
+	ChannelID uint64 `json:",string"`
+}
+
+func NewChannelRemoveFlag() *ChannelRemoveFlag {
+	return &ChannelRemoveFlag{}
+}
+
+func (c *ChannelRemoveFlag) Fill(r *http.Request) (err error) {
+	if strings.ToLower(r.Header.Get("content-type")) == "application/json" {
+		err = json.NewDecoder(r.Body).Decode(c)
+
+		switch {
+		case err == io.EOF:
+			err = nil
+		case err != nil:
+			return errors.Wrap(err, "error parsing http request body")
+		}
+	}
+
+	if err = r.ParseForm(); err != nil {
+		return err
+	}
+
+	get := map[string]string{}
+	post := map[string]string{}
+	urlQuery := r.URL.Query()
+	for name, param := range urlQuery {
+		get[name] = string(param[0])
+	}
+	postVars := r.Form
+	for name, param := range postVars {
+		post[name] = string(param[0])
+	}
+
+	c.ChannelID = parseUInt64(chi.URLParam(r, "channelID"))
+
+	return err
+}
+
+var _ RequestFiller = NewChannelRemoveFlag()
+
 // Channel read request parameters
 type ChannelRead struct {
 	ChannelID uint64 `json:",string"`
diff --git a/sam/service/channel.go b/sam/service/channel.go
index 3b7db67f8..71ad7a927 100644
--- a/sam/service/channel.go
+++ b/sam/service/channel.go
@@ -44,6 +44,8 @@ type (
 		AddMember(channelID uint64, memberIDs ...uint64) (out types.ChannelMemberSet, err error)
 		DeleteMember(channelID uint64, memberIDs ...uint64) (err error)
 
+		SetFlag(ID uint64, flag types.ChannelMembershipFlag) (*types.Channel, error)
+
 		Archive(ID uint64) (*types.Channel, error)
 		Unarchive(ID uint64) (*types.Channel, error)
 		Delete(ID uint64) (*types.Channel, error)
@@ -480,6 +482,35 @@ func (svc *channel) Undelete(ID uint64) (ch *types.Channel, err error) {
 	})
 }
 
+func (svc *channel) SetFlag(ID uint64, flag types.ChannelMembershipFlag) (ch *types.Channel, err error) {
+	return ch, svc.db.Transaction(func() (err error) {
+		var membership *types.ChannelMember
+		var userID = repository.Identity(svc.ctx)
+
+		if ch, err = svc.FindByID(ID); err != nil {
+			return
+		}
+
+		if members, err := svc.cmember.Find(&types.ChannelMemberFilter{ChannelID: ch.ID, MemberID: userID}); err != nil {
+			return err
+		} else if len(members) == 1 {
+			membership = members[0]
+			membership.Flag = flag
+		}
+
+		if membership == nil {
+			return errors.New("not a member")
+		}
+
+		if ch.Member, err = svc.cmember.Update(membership); err != nil {
+			return
+		}
+
+		svc.flushSystemMessages()
+		return svc.sendChannelEvent(ch)
+	})
+}
+
 func (svc *channel) Archive(ID uint64) (ch *types.Channel, err error) {
 	return ch, svc.db.Transaction(func() (err error) {
 		var userID = repository.Identity(svc.ctx)
@@ -809,7 +840,7 @@ func (svc *channel) setPermissionFlags(ch *types.Channel) (err error) {
 	)
 
 	ch.CanJoin = (ch.IsValid() && isPublic) || isOwner
-	ch.CanPart = isMember
+	ch.CanPart = isMember && ch.Type != types.ChannelTypeGroup
 	ch.CanObserve = (ch.IsValid() && isPublic) || isMember
 	ch.CanSendMessages = ch.CanObserve && isMember
 	ch.CanDeleteMessages = isOwner
diff --git a/sam/types/channel_member.go b/sam/types/channel_member.go
index a91d51eed..148ac3e09 100644
--- a/sam/types/channel_member.go
+++ b/sam/types/channel_member.go
@@ -14,6 +14,7 @@ type (
 		User   *systemTypes.User `db:"-"`
 
 		Type ChannelMembershipType `db:"type"`
+		Flag ChannelMembershipFlag `db:"flag"`
 
 		CreatedAt time.Time  `json:"createdAt,omitempty" db:"created_at"`
 		UpdatedAt *time.Time `json:"updatedAt,omitempty" db:"updated_at"`
@@ -26,10 +27,16 @@ type (
 	}
 
 	ChannelMembershipType string
+	ChannelMembershipFlag string
 )
 
 const (
 	ChannelMembershipTypeOwner   ChannelMembershipType = "owner"
-	ChannelMembershipTypeMember                        = "member"
-	ChannelMembershipTypeInvitee                       = "invitee"
+	ChannelMembershipTypeMember  ChannelMembershipType = "member"
+	ChannelMembershipTypeInvitee ChannelMembershipType = "invitee"
+
+	ChannelMembershipFlagPinned  ChannelMembershipFlag = "pinned"
+	ChannelMembershipFlagHidden  ChannelMembershipFlag = "hidden"
+	ChannelMembershipFlagIgnored ChannelMembershipFlag = "ignored"
+	ChannelMembershipFlagNone    ChannelMembershipFlag = ""
 )