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()

backend/migrations/script.py.mako

@@ -0,0 +1,21 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

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())