temporal_v2: add memory cost reporting (#4257)

Signed-off-by: Benji Visser <benji@093b.org>
Co-authored-by: Benji Visser <benji@093b.org>

alembic/versions/2025_12_10_1915-174dcd456325_add_memory_mb_to_task_runs.py

@@ -0,0 +1,31 @@
+"""add memory_mb to task_runs
+
+Revision ID: 174dcd456325
+Revises: 67784da0203e
+Create Date: 2025-12-10 19:15:24.067819+00:00
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "174dcd456325"
+down_revision: Union[str, None] = "67784da0203e"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column("task_runs", sa.Column("memory_mb", sa.Integer(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("task_runs", "memory_mb")
+    # ### end Alembic commands ###