feat: add versioned backend scoring workflow

backend/migrations/env.py

@@ -0,0 +1,24 @@
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+from wisegrade.config import get_settings
+from wisegrade.db import Base
+from wisegrade import models  # noqa: F401
+
+config = context.config
+config.set_main_option("sqlalchemy.url", get_settings().database_url.replace("%", "%%"))
+target_metadata = Base.metadata
+
+
+def run_migrations_online():
+    connectable = engine_from_config(config.get_section(config.config_ini_section), prefix="sqlalchemy.", poolclass=pool.NullPool)
+    with connectable.connect() as connection:
+        if connection.dialect.name == "postgresql":
+            connection.exec_driver_sql("CREATE EXTENSION IF NOT EXISTS vector")
+            connection.commit()
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+run_migrations_online()