Add Inter-Hub migration bundle importer

migrations/versions/20260627_0002_add_migration_runs.py

@@ -0,0 +1,39 @@
+"""add migration run ledger
+
+Revision ID: 20260627_0002
+Revises: 20260627_0001
+Create Date: 2026-06-27
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "20260627_0002"
+down_revision: str | None = "20260627_0001"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "migration_runs",
+        sa.Column("id", sa.String(length=36), primary_key=True),
+        sa.Column("source", sa.String(length=120), nullable=False),
+        sa.Column("schema_version", sa.String(length=80), nullable=False),
+        sa.Column("bundle_sha256", sa.String(length=64), nullable=False),
+        sa.Column("dry_run", sa.Boolean(), nullable=False),
+        sa.Column("status", sa.String(length=40), nullable=False),
+        sa.Column("counts_json", sa.Text(), nullable=False),
+        sa.Column("diagnostics_json", sa.Text(), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+    )
+    op.create_index("ix_migration_runs_source", "migration_runs", ["source"])
+    op.create_index("ix_migration_runs_bundle_sha256", "migration_runs", ["bundle_sha256"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_migration_runs_bundle_sha256", table_name="migration_runs")
+    op.drop_index("ix_migration_runs_source", table_name="migration_runs")
+    op.drop_table("migration_runs")