diff --git a/backend/alembic/versions/2022_12_28_1824-ef0b52902560_added_lang_column_for_iso_639_1_codes.py b/backend/alembic/versions/2022_12_28_1824-ef0b52902560_added_lang_column_for_iso_639_1_codes.py
index 203eb2ea..cb6ae5da 100644
--- a/backend/alembic/versions/2022_12_28_1824-ef0b52902560_added_lang_column_for_iso_639_1_codes.py
+++ b/backend/alembic/versions/2022_12_28_1824-ef0b52902560_added_lang_column_for_iso_639_1_codes.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Added lang column for ISO-639-1 codes
 
 Revision ID: ef0b52902560
@@ -5,25 +6,26 @@ Revises: 3358eb6834e6
 Create Date: 2022-12-28 18:24:21.393973
 
 """
-from alembic import op
 import sqlalchemy as sa
 import sqlmodel
-
+from alembic import op
 
 # revision identifiers, used by Alembic.
-revision = 'ef0b52902560'
-down_revision = '3358eb6834e6'
+revision = "ef0b52902560"
+down_revision = "3358eb6834e6"
 branch_labels = None
 depends_on = None
 
 
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.add_column('post', sa.Column('lang', sqlmodel.sql.sqltypes.AutoString(length=200), nullable=False, default="en-US"))
+    op.add_column(
+        "post", sa.Column("lang", sqlmodel.sql.sqltypes.AutoString(length=200), nullable=False, default="en-US")
+    )
     # ### end Alembic commands ###
 
 
 def downgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_column('post', 'lang')
+    op.drop_column("post", "lang")
     # ### end Alembic commands ###
diff --git a/backend/oasst_backend/models/post.py b/backend/oasst_backend/models/post.py
index 03f01186..51fa067e 100644
--- a/backend/oasst_backend/models/post.py
+++ b/backend/oasst_backend/models/post.py
@@ -33,4 +33,4 @@ class Post(SQLModel, table=True):
     payload: PayloadContainer = Field(sa_column=sa.Column(payload_column_type(PayloadContainer), nullable=True))
     lang: str = Field(nullable=False, max_length=200, default="en-US")
     depth: int = Field(sa_column=sa.Column(sa.Integer, default=0, server_default=sa.text("0"), nullable=False))
-    children_count: int = Field(sa_column=sa.Column(sa.Integer, default=0, server_default=sa.text("0"), nullable=False))
\ No newline at end of file
+    children_count: int = Field(sa_column=sa.Column(sa.Integer, default=0, server_default=sa.text("0"), nullable=False))