diff --git a/create_crt.sh b/create_crt.sh
old mode 100644
new mode 100755
index d36eec87..9a5264bb
--- a/create_crt.sh
+++ b/create_crt.sh
@@ -7,4 +7,4 @@ openssl req -newkey rsa:4096 \
             -nodes \
             -out discours.crt \
             -keyout discours.key \
-            -subj "/C=RU/ST=Moscow/L=Moscow/O=Discours/OU=Site/CN=test-api.discours.io"
+            -subj "/C=RU/ST=Moscow/L=Moscow/O=Discours/OU=Site/CN=build.discours.io"
diff --git a/migration/tables/content_item_categories.py b/migration/tables/content_item_categories.py
index c2965f5e..08fcef85 100644
--- a/migration/tables/content_item_categories.py
+++ b/migration/tables/content_item_categories.py
@@ -15,8 +15,8 @@ def migrate(entry):
     '''
     topic_dict = {
         'slug': entry['slug'],
-        'createdBy': entry['createdBy'],
-        'createdAt': date_parse(entry['createdAt']),
+        # 'createdBy': entry['createdBy'],
+        # 'createdAt': date_parse(entry['createdAt']),
         'title': entry['title'].lower(),
         'parents': [],
         'children': [],
diff --git a/migration/tables/tags.py b/migration/tables/tags.py
index 9a35301d..afe0c09b 100644
--- a/migration/tables/tags.py
+++ b/migration/tables/tags.py
@@ -21,8 +21,8 @@ def migrate(entry):
         ts = datetime.fromtimestamp(entry['createdAt']/1000)
     topic_dict = {
         'slug': entry['slug'],
-        'createdBy': entry['createdBy'],
-        'createdAt': ts,
+        # 'createdBy': entry['createdBy'],
+        # 'createdAt': ts,
         'title': entry['title'].lower(),
         'parents': [],
         'children': []
diff --git a/orm/__init__.py b/orm/__init__.py
index 815d7c9a..8bdfdfc5 100644
--- a/orm/__init__.py
+++ b/orm/__init__.py
@@ -2,14 +2,14 @@ from orm.rbac import Operation, Resource, Permission, Role
 from orm.community import Community
 from orm.user import User, UserRating
 from orm.message import Message
-from orm.topic import Topic
+from orm.topic import Topic, TopicSubscription
 from orm.notification import Notification
 from orm.shout import Shout, ShoutAuthor, ShoutTopic, ShoutRating, ShoutViewByDay,\
 	ShoutRatingStorage, ShoutViewStorage
 from orm.base import Base, engine, local_session
 from orm.comment import Comment, CommentRating
 
-__all__ = ["User", "Role", "Operation", "Permission", "Message", "Shout", "Topic", "Notification", "ShoutRating", "Comment", "CommentRating", "UserRating"]
+__all__ = ["User", "Role", "Operation", "Permission", "Message", "Shout", "Topic", "TopicSubscription", "Notification", "ShoutRating", "Comment", "CommentRating", "UserRating"]
 
 Base.metadata.create_all(engine)
 Operation.init_table()
diff --git a/orm/topic.py b/orm/topic.py
index a437e305..f10a1195 100644
--- a/orm/topic.py
+++ b/orm/topic.py
@@ -11,13 +11,18 @@ Connection = Table('topic_connections',
     UniqueConstraint('parent', 'child', name='unique_usage')
 )
 
+class TopicSubscription(Base):
+	__tablename__ = "topic_subscrptions"
+	
+	id = None
+	topic = Column(ForeignKey('topic.slug'), primary_key = True)
+	user = Column(ForeignKey('user.id'), primary_key = True)
+	createdAt: str = Column(DateTime, nullable=False, default = datetime.now, comment="Created at")
 
 class Topic(Base):
 	__tablename__ = 'topic'
 
 	slug: str = Column(String, unique = True, nullable = False)
-	createdAt: str = Column(DateTime, nullable=False, default = datetime.now, comment="Created at")
-	createdBy: str = Column(ForeignKey("user.id"), nullable=False, comment="Author")
 	title: str = Column(String, nullable=False, comment="Title")
 	body: str = Column(String, nullable=True, comment="Body")
 	pic: str = Column(String, nullable=True, comment="Picture")
@@ -26,4 +31,5 @@ class Topic(Base):
 	parents = relationship(lambda: Topic, secondary=Connection, primaryjoin=slug==Connection.c.parent, secondaryjoin=slug==Connection.c.child, viewonly=True)
 	# list of Topics where the current node is the "parent" 
 	children = relationship(lambda: Topic, secondary=Connection, primaryjoin=slug==Connection.c.child, secondaryjoin=slug==Connection.c.parent)
+	community = Column(ForeignKey("community.slug"), nullable=True, comment="Community")
 
diff --git a/resolvers/__init__.py b/resolvers/__init__.py
index c6508c86..e0cc0b8b 100644
--- a/resolvers/__init__.py
+++ b/resolvers/__init__.py
@@ -2,6 +2,7 @@ from resolvers.auth import login, sign_out, is_email_free, register, confirm
 from resolvers.inbox import create_message, delete_message, update_message, get_messages
 from resolvers.zine import create_shout, get_shout_by_slug
 from resolvers.profile import get_user_by_slug, get_current_user
+from resolvers.topics import topic_subscribe, topic_unsubscribe, topics_by_author, topics_by_community, topics_by_slugs
 
 __all__ = [
     "login",
@@ -17,5 +18,10 @@ __all__ = [
     "create_shout",
     "get_current_user",
     "get_user_by_slug",
-    "get_shout_by_slug"
+    "get_shout_by_slug",
+    "topics_by_slugs",
+    "topics_by_community",
+    "topics_by_author",
+    "topic_subscribe",
+    "topic_unsubscribe"
     ]
diff --git a/resolvers/topics.py b/resolvers/topics.py
new file mode 100644
index 00000000..05fda722
--- /dev/null
+++ b/resolvers/topics.py
@@ -0,0 +1,45 @@
+from orm import Topic, TopicSubscription
+from orm.base import local_session
+from resolvers.base import mutation, query, subscription
+from auth.authenticate import login_required
+import asyncio
+
+@query.field("topicsBySlugs")
+async def topics_by_slugs(_, info, slugs):
+	topics = []
+	with local_session() as session:
+		topics = session.query(Topic).filter(Topic.slug in slugs)
+	return topics
+
+@query.field("topicsByCommunity")
+async def topics_by_community(_, info, community):
+	topics = []
+	with local_session() as session:
+		topics = session.query(Topic).filter(Topic.community == community)
+	return topics
+
+@query.field("topicsByAuthor")
+async def topics_by_author(_, info, author):
+	topics = []
+	with local_session() as session:
+		topics = session.query(Topic).filter(Topic.community == community)
+		return topics
+
+@mutation.field("topicSubscribe")
+@login_required
+async def topic_subscribe(_, info, slug):
+	auth = info.context["request"].auth
+	user_id = auth.user_id
+	sub = TopicSubscription.create({ user: user_id, topic: slug })
+	return {} # type Result
+
+@mutation.field("topicUnsubscribe")
+@login_required
+async def topic_unsubscribe(_, info, slug):
+	auth = info.context["request"].auth
+	user_id = auth.user_id
+	sub = session.query(TopicSubscription).filter(TopicSubscription.user == user_id and TopicSubscription.topic == slug).first()
+	with local_session() as session:
+		session.delete(sub)
+		return {} # type Result
+	return { "error": "session error" }
diff --git a/schema.graphql b/schema.graphql
index 65f4c73d..abb521cd 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -75,6 +75,10 @@ type Mutation {
   # rateUser(value: Int!): Result!
   # updateOnlineStatus: Result!
   updateProfile(profile: ProfileInput!): Result!
+
+  # topics
+  topicSubscribe(slug: String!): Result!
+  topicUnsubscribe(slug: String!): Result!
 }
 
 ################################### Query
@@ -107,6 +111,11 @@ type Query {
   favoritesShouts(limit: Int): [Shout]!
   topAuthors(limit: Int): [User]!
 
+  # topics
+  topicsBySlugs(slugs: [String]!): [Topic]!
+  topicsByCommunity(community: String!): [Topic]!
+  topicsByAuthor(author: String!): [Topic]!
+
   # getOnlineUsers: [User!]!
 }
 
@@ -120,6 +129,7 @@ type Subscription {
   onlineUpdated: [User!]!
   shoutUpdated: Shout!
   userUpdated: User!
+  topicUpdated: Shout!
 }
 
 ############################################ Entities
@@ -253,8 +263,6 @@ type Topic {
   title: String
   body: String
   pic: String
-  createdBy: Int! # User
-  createdAt: DateTime!
   parents: [String] # NOTE: topic can have parent topics
   children: [String] # and children
   cat_id: String
diff --git a/server.py b/server.py
index 8ff87e58..3c96e7ff 100644
--- a/server.py
+++ b/server.py
@@ -5,7 +5,8 @@ import sys
 
 if __name__ == '__main__':
 	dev_mode = len(sys.argv) > 1 and sys.argv[1] == "dev"
-	if dev_mode :
+	if dev_mode:
+		print("DEV MODE")
 		uvicorn.run("main:app", host="0.0.0.0", port=8080, ssl_keyfile="discours.key", ssl_certfile="discours.crt", reload=True)
 	else :
 		uvicorn.run("main:app", host="0.0.0.0", port=PORT)