feat(content): pattern comparisons

backend/alembic/versions/007_pattern_comparison.py

@@ -0,0 +1,25 @@
+"""add pattern_comparison to explanations
+
+Revision ID: 007
+Revises: 006
+Create Date: 2025-07-05
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "007"
+down_revision: str | None = "006"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column("explanations", sa.Column("pattern_comparison", sa.Text(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("explanations", "pattern_comparison")