feat: add versioned backend scoring workflow

backend/migrations/versions/0001_initial.py

@@ -0,0 +1,22 @@
+"""Initial schema.
+
+Revision ID: 0001
+Revises:
+"""
+from alembic import op
+
+from wisegrade.db import Base
+from wisegrade import models  # noqa: F401
+
+revision = "0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    Base.metadata.create_all(op.get_bind())
+
+
+def downgrade():
+    Base.metadata.drop_all(op.get_bind())