feat(canvas): 创作助手 - 合并创作对话、能力发现与画布接续

backend/internal/database/creation_migration_test.go

@@ -0,0 +1,33 @@
+package database
+
+import (
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"infinite-canvas/backend/internal/model"
+	"testing"
+)
+
+func TestCreationMigrationKeepsLegacyTasksNullableAndEnforcesSubmissionUnique(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = migrateSchemaV10(db); err != nil {
+		t.Fatal(err)
+	}
+	for _, id := range []string{"manual-one", "manual-two"} {
+		if err = db.Create(&model.Task{ID: id}).Error; err != nil {
+			t.Fatal(err)
+		}
+	}
+	sid := "submission"
+	if err = db.Create(&model.Task{ID: "creation-one", CreationSubmissionID: &sid}).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err = db.Create(&model.Task{ID: "creation-two", CreationSubmissionID: &sid}).Error; err == nil {
+		t.Fatal("duplicate execution admitted")
+	}
+	if !db.Migrator().HasTable(&model.CreationRun{}) || !db.Migrator().HasTable(&model.CreationSubmission{}) {
+		t.Fatal("creation tables missing")
+	}
+}