use raw sql to create alias.ts_vector column

migrations/versions/2021_080409_9014cca7097c_.py

@@ -19,7 +19,14 @@ depends_on = None
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    op.add_column('alias', sa.Column('ts_vector', "ts_vector", sa.Computed("to_tsvector('english', note)", persisted=True), nullable=True))
+    bind = op.get_bind()
+    session = Session(bind=bind)
+
+    session.execute("""
+    ALTER TABLE alias ADD COLUMN ts_vector tsvector GENERATED ALWAYS 
+    AS (to_tsvector('english', note)) STORED;
+    """)
+
     op.create_index('ix_video___ts_vector__', 'alias', ['ts_vector'], unique=False, postgresql_using='gin')
     # ### end Alembic commands ###