refac: migration crash, real-database tests, site deleted during create, ruels out of the repo, lists

internal/infrastructure/persistence/database/driver.go

@@ -24,6 +24,7 @@ type Driver interface {
 	Open(source string) (*gorm.DB, error)
 	NewBackup(db *gorm.DB, directory string, now func() time.Time) domainUpdate.DatabaseBackup
 	IsLockContention(err error) bool
+	IsUniqueViolation(err error) bool
 }
 
 var drivers = map[string]Driver{
@@ -41,6 +42,15 @@ func IsLockContention(db *gorm.DB, err error) bool {
 	return IsLockContentionFor(db.Name(), err)
 }
 
+func IsUniqueViolationFor(driverName string, err error) bool {
+	driver, ok := drivers[driverName]
+	return ok && err != nil && driver.IsUniqueViolation(err)
+}
+
+func IsUniqueViolation(db *gorm.DB, err error) bool {
+	return IsUniqueViolationFor(db.Name(), err)
+}
+
 type Connection struct {
 	DB     *gorm.DB
 	driver Driver