🚚 Add a size column to dobject (#32)

* 🚚 Add a size column to dobject

* 📝 Fix type anno another time

* 🚚 Add migration and migrate testdb

lnschema_core/_core.py

@@ -79,6 +79,8 @@ class dobject(SQLModel, table=True):  # type: ignore
     name: Optional[str] = Field(index=True)
     suffix: Optional[str] = Field(default=None, index=True)
     dtransform_id: str = Field(foreign_key="dtransform.id", index=True)
+    size: Optional[float] = Field(default=None, index=True)
+    """Size in bytes."""
     storage_id: str = Field(foreign_key="storage.id", index=True)
     created_at: datetime = CreatedAt
     updated_at: Optional[datetime] = UpdatedAt

lnschema_core/migrations/versions/2022-09-25-7e8f7b30792e-v0_8_0.py

@@ -0,0 +1,27 @@
+"""v0.8.0.
+
+Revision ID: 7e8f7b30792e
+Revises: 1f29517759b7
+Create Date: 2022-09-25 20:39:03.626212
+"""
+import sqlalchemy as sa  # noqa
+import sqlmodel  # noqa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "7e8f7b30792e"
+down_revision = "1f29517759b7"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("dobject", schema=None) as batch_op:
+        batch_op.add_column(sa.Column("size", sa.Float(), nullable=True))
+        batch_op.create_index(batch_op.f("ix_dobject_size"), ["size"], unique=False)
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("dobject", schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f("ix_dobject_size"))
+        batch_op.drop_column("size")