Drop container_relations from blog DB — now lives in cart

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blog/alembic/versions/0002_drop_container_relations.py

@@ -0,0 +1,40 @@
+"""Drop container_relations table — moved to cart service.
+
+Revision ID: blog_0002
+Revises: blog_0001
+Create Date: 2026-02-26
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "blog_0002"
+down_revision = "blog_0001"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.drop_index("ix_container_relations_child", table_name="container_relations")
+    op.drop_index("ix_container_relations_parent", table_name="container_relations")
+    op.drop_table("container_relations")
+
+
+def downgrade() -> None:
+    op.create_table(
+        "container_relations",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("parent_type", sa.String(32), nullable=False),
+        sa.Column("parent_id", sa.Integer(), nullable=False),
+        sa.Column("child_type", sa.String(32), nullable=False),
+        sa.Column("child_id", sa.Integer(), nullable=False),
+        sa.Column("sort_order", sa.Integer(), nullable=False),
+        sa.Column("label", sa.String(255), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
+        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("parent_type", "parent_id", "child_type", "child_id",
+                            name="uq_container_relations_parent_child"),
+    )
+    op.create_index("ix_container_relations_parent", "container_relations", ["parent_type", "parent_id"])
+    op.create_index("ix_container_relations_child", "container_relations", ["child_type", "child_id"])