better migrations

migrations/versions/make_events_user_id_nullable.py

@@ -0,0 +1,27 @@
+"""make events user_id nullable
+
+Revision ID: make_events_user_id_nullable
+Revises: f18735338888
+Create Date: 2024-03-19 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = 'make_events_user_id_nullable'
+down_revision = 'f18735338888'  # This should be the latest migration
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    # Make user_id nullable in events table
+    op.alter_column('events', 'user_id',
+               existing_type=sa.Integer(),
+               nullable=True)
+
+def downgrade():
+    # Make user_id non-nullable again
+    op.alter_column('events', 'user_id',
+               existing_type=sa.Integer(),
+               nullable=False)