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

internal/infrastructure/persistence/database/sqlite.go

@@ -19,6 +19,8 @@ const (
 	sqliteResultBusy    = 5
 	sqliteResultLocked  = 6
 	sqlitePrimaryMask   = 0xff
+	sqliteUniqueKey     = 2067
+	sqlitePrimaryKey    = 1555
 )
 
 type sqliteDriver struct{}
@@ -39,10 +41,20 @@ func (sqliteDriver) NewBackup(db *gorm.DB, directory string, now func() time.Tim
 }
 
 func (sqliteDriver) IsLockContention(err error) bool {
+	code, ok := sqliteCode(err)
+	primary := code & sqlitePrimaryMask
+	return ok && (primary == sqliteResultBusy || primary == sqliteResultLocked)
+}
+
+func (sqliteDriver) IsUniqueViolation(err error) bool {
+	code, ok := sqliteCode(err)
+	return ok && (code == sqliteUniqueKey || code == sqlitePrimaryKey)
+}
+
+func sqliteCode(err error) (int, bool) {
 	var coded interface{ Code() int }
 	if !errors.As(err, &coded) {
-		return false
+		return 0, false
 	}
-	primary := coded.Code() & sqlitePrimaryMask
-	return primary == sqliteResultBusy || primary == sqliteResultLocked
+	return coded.Code(), true
 }