fix(backend): harden final MVP invariants

backend/internal/models/migrations_test.go

@@ -0,0 +1,84 @@
+package models
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/glebarez/sqlite"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+)
+
+func TestAutoMigrateUpgradesLegacyProjectsAndTagsWithoutLosingAssociations(t *testing.T) {
+	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{TranslateError: true})
+	require.NoError(t, err)
+
+	legacySchema := []string{
+		`CREATE TABLE senlin_agent_projects (id integer primary key, owner_id integer not null, name text not null, identifier text)`,
+		`CREATE TABLE senlin_agent_tags (id integer primary key, identity text, project_id integer not null, name text not null)`,
+		`CREATE TABLE senlin_agent_tasks (id integer primary key, project_id integer not null, created_by integer not null, tag_id integer, tag_identity text, title text not null, status text not null)`,
+		`INSERT INTO senlin_agent_projects (id, owner_id, name, identifier) VALUES
+			(1, 7, 'Blank one', ''),
+			(2, 7, 'Blank two', NULL),
+			(3, 7, 'Keeper', 'DUP'),
+			(4, 7, 'Duplicate', 'DUP'),
+			(5, 7, 'Reserved suffix', 'DUP-4'),
+			(6, 8, 'Other owner', 'DUP')`,
+		`INSERT INTO senlin_agent_tags (id, identity, project_id, name) VALUES
+			(10, 'tag-keeper', 1, 'UI'),
+			(11, 'tag-duplicate', 1, 'UI'),
+			(12, 'tag-other-project', 2, 'UI')`,
+		`INSERT INTO senlin_agent_tasks (id, project_id, created_by, tag_id, tag_identity, title, status)
+			VALUES (20, 1, 7, 11, 'tag-duplicate', 'Keep association', 'open')`,
+	}
+	for _, statement := range legacySchema {
+		require.NoError(t, database.Exec(statement).Error)
+	}
+
+	require.NoError(t, AutoMigrate(database))
+
+	var projects []SenlinAgentProject
+	require.NoError(t, database.Order("id asc").Find(&projects).Error)
+	require.Len(t, projects, 6, "项目迁移不得删除 legacy 行")
+	require.Equal(t, []string{"project-1", "project-2", "DUP", "DUP-4-2", "DUP-4", "DUP"}, projectIdentifiers(projects))
+
+	var tags []SenlinAgentTag
+	require.NoError(t, database.Order("id asc").Find(&tags).Error)
+	require.Equal(t, []uint{10, 12}, tagIDs(tags), "同项目同名标签应保留最早记录，不影响其他项目")
+	var task SenlinAgentTask
+	require.NoError(t, database.First(&task, 20).Error)
+	require.NotNil(t, task.TagID)
+	require.Equal(t, uint(10), *task.TagID)
+	require.NotNil(t, task.TagIdentity)
+	require.Equal(t, "tag-keeper", *task.TagIdentity)
+
+	var migrationCount int64
+	require.NoError(t, database.Table("senlin_agent_schema_migrations").Count(&migrationCount).Error)
+	require.Equal(t, int64(2), migrationCount)
+	var auditDetails []string
+	require.NoError(t, database.Table("senlin_agent_schema_migrations").Order("version asc").Pluck("details", &auditDetails).Error)
+	require.Contains(t, auditDetails[0], `"updated":3`)
+	require.Contains(t, auditDetails[1], `"deduplicated":1`)
+	require.NoError(t, AutoMigrate(database), "versioned migrations must be safe to run again")
+	require.NoError(t, database.Table("senlin_agent_schema_migrations").Count(&migrationCount).Error)
+	require.Equal(t, int64(2), migrationCount)
+
+	require.Error(t, database.Exec(`INSERT INTO senlin_agent_projects (owner_id, name, identifier) VALUES (7, 'still duplicate', 'DUP')`).Error)
+	require.Error(t, database.Exec(`INSERT INTO senlin_agent_tags (project_id, name) VALUES (1, 'UI')`).Error)
+}
+
+func projectIdentifiers(projects []SenlinAgentProject) []string {
+	result := make([]string, 0, len(projects))
+	for _, project := range projects {
+		result = append(result, project.Identifier)
+	}
+	return result
+}
+
+func tagIDs(tags []SenlinAgentTag) []uint {
+	result := make([]uint, 0, len(tags))
+	for _, tag := range tags {
+		result = append(result, tag.ID)
+	}
+	return result
+}