fc5: migration 0015 + MigrationRun model (kind/status as String(32), API-validated)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

alembic/versions/0015_fc5_migration_run.py

@@ -0,0 +1,51 @@
+"""fc5: migration_run table
+
+Revision ID: 0015
+Revises: 0014
+Create Date: 2026-05-22
+
+Additive only. New table tracks each invocation of the FC-5 migration
+tooling (backup, gs, ir, ml_queue, verify, rollback). kind/status are
+plain String(32) — values validated at the API layer per the spec, not
+a Postgres ENUM (so adding kinds later doesn't need a schema migration).
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision: str = "0015"
+down_revision: Union[str, None] = "0014"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "migration_run",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("kind", sa.String(32), nullable=False, index=True),
+        sa.Column("status", sa.String(32), nullable=False, index=True),
+        sa.Column(
+            "dry_run", sa.Boolean(), nullable=False, server_default=sa.false(),
+        ),
+        sa.Column(
+            "started_at", sa.DateTime(timezone=True),
+            nullable=False, server_default=sa.func.now(),
+        ),
+        sa.Column("finished_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column(
+            "counts", postgresql.JSONB,
+            nullable=False, server_default=sa.text("'{}'::jsonb"),
+        ),
+        sa.Column("error", sa.Text(), nullable=True),
+        sa.Column(
+            "metadata", postgresql.JSONB,
+            nullable=False, server_default=sa.text("'{}'::jsonb"),
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("migration_run")