HH-442: isolate runtime processes and harden shutdown (#90)

* HH-442: isolate runtime processes and harden shutdown

* HH-442: harden worker shutdown races

* HH-442: gate dependency shutdown on active handlers

---------

Co-authored-by: Rogee <rogee@ipao.vip>

backend/internal/database/migrate_test.go

@@ -1,10 +1,14 @@
 package database
 
 import (
+	"context"
 	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
 )
 
 func TestMigrationCommandsRejectBlankPath(t *testing.T) {
@@ -56,3 +60,23 @@ func TestSanitizePostgresEnvironment(t *testing.T) {
 		require.False(t, exists, "%s should be removed at application startup", key)
 	}
 }
+
+func TestLatestVersionAndCheckVersion(t *testing.T) {
+	dir := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "000001_first.up.sql"), []byte("SELECT 1;"), 0o600))
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "000012_latest.up.sql"), []byte("SELECT 1;"), 0o600))
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "README"), nil, 0o600))
+
+	latest, err := LatestVersion(dir)
+	require.NoError(t, err)
+	require.Equal(t, uint(12), latest)
+
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	require.NoError(t, err)
+	require.NoError(t, db.Exec("CREATE TABLE schema_migrations (version INTEGER NOT NULL, dirty BOOLEAN NOT NULL)").Error)
+	require.NoError(t, db.Exec("INSERT INTO schema_migrations(version, dirty) VALUES (12, false)").Error)
+	require.NoError(t, CheckVersion(context.Background(), db, latest))
+	require.Error(t, CheckVersion(context.Background(), db, 13))
+	require.NoError(t, db.Exec("UPDATE schema_migrations SET dirty = true").Error)
+	require.ErrorContains(t, CheckVersion(context.Background(), db, latest), "dirty")
+}