model upgrade

orm/topic.py

@@ -0,0 +1,18 @@
+from typing import List
+from datetime import datetime
+from sqlalchemy import Column, Integer, String, ForeignKey, DateTime
+from sqlalchemy.orm import relationship, backref
+from orm import Permission
+from orm.base import Base
+
+class Topic(Base):
+	__tablename__ = 'topic'
+
+	slug: str = Column(String, unique = True, nullable = False, primary_key=True)
+	org_id: str = Column(ForeignKey("organization.id"), nullable=False)
+	createdAt: str = Column(DateTime, nullable=False, default = datetime.now, comment="Created at")
+	createdBy: str = Column(ForeignKey("user.id"), nullable=False, comment="Author")
+	value: str = Column(String, nullable=False, comment="Value")
+	alters = relationship(lambda: Topic, backref=backref("topic", remote_side=[slug]))
+	alter_id: str = Column(ForeignKey("topic.slug"))
+	# TODO: add all the fields