New migration script for Metric value not nullable

migration/alembic/versions/943ea08a8a82_making_value_from_metric_nullable.py

@@ -0,0 +1,31 @@
+"""Making value from Metric nullable
+
+Revision ID: 943ea08a8a82
+Revises: d1dc98f61aee
+Create Date: 2024-11-19 14:53:47.781164
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from alembic_utils.pg_grant_table import PGGrantTable
+from sqlalchemy import text as sql_text
+
+# revision identifiers, used by Alembic.
+revision: str = '943ea08a8a82'
+down_revision: Union[str, None] = 'd1dc98f61aee'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.alter_column('metric', 'value',
+               existing_type=sa.VARCHAR(),
+               nullable=True)
+
+
+def downgrade() -> None:
+    op.alter_column('metric', 'value',
+               existing_type=sa.VARCHAR(),
+               nullable=False)