Add the free Fast migration

backend/migrations/233_group_free_openai_fast.sql

@@ -0,0 +1,5 @@
+ALTER TABLE groups
+    ADD COLUMN IF NOT EXISTS free_openai_fast BOOLEAN NOT NULL DEFAULT FALSE;
+
+COMMENT ON COLUMN groups.free_openai_fast IS
+    'Whether Fast/priority requests in this OpenAI/Composite group are billed to users at Standard price';

backend/migrations/group_free_openai_fast_migration_test.go

@@ -0,0 +1,18 @@
+package migrations
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGroupFreeOpenAIFastMigration(t *testing.T) {
+	content, err := FS.ReadFile("233_group_free_openai_fast.sql")
+	require.NoError(t, err)
+
+	sql := strings.Join(strings.Fields(string(content)), " ")
+	require.Contains(t, sql,
+		"ADD COLUMN IF NOT EXISTS free_openai_fast BOOLEAN NOT NULL DEFAULT FALSE")
+	require.Contains(t, sql, "COMMENT ON COLUMN groups.free_openai_fast")
+}