chore: remove unnecessary comments from previous refactoring

Co-authored-by: aider (anthropic/claude-opus-4-5-20251101) <[email protected]>

Author: Slach

pkg/backup/create.go

@@ -301,9 +301,6 @@ func (b *Backuper) createBackupLocal(ctx context.Context, backupName, diffFromRe
 		}
 	}
 
-	// Check all tables for consistent column types BEFORE any freeze operations
-	// This avoids having unfrozen data parts if only one table contains inconsistent column data types
-	// https://github.com/Altinity/clickhouse-backup/issues/529
 	if b.cfg.ClickHouse.CheckPartsColumns && doBackupData {
 		tablesToCheck := make([]clickhouse.Table, 0, len(tables))
 		for _, table := range tables {
@@ -908,9 +905,6 @@ func (b *Backuper) AddTableToLocalBackup(ctx context.Context, backupName string,
 		}
 		return nil, nil, nil, nil, nil
 	}
-	// Note: CheckPartsColumns is now done for all tables at once in createBackupLocal
-	// before any AddTableToLocalBackup calls to avoid unfrozen data parts on failure
-	// backup data
 	if err := b.ch.FreezeTable(ctx, table, shadowBackupUUID); err != nil {
 		return nil, nil, nil, nil, err
 	}

pkg/clickhouse/clickhouse.go

@@ -1391,22 +1391,18 @@ func (ch *ClickHouse) CheckReplicationInProgress(table metadata.TableMetadata) (
 	return true, nil
 }
 
-// ColumnDataTypesWithTable extends ColumnDataTypes with database and table information for batch queries
 type ColumnDataTypesWithTable struct {
 	Database string   `ch:"database"`
 	Table    string   `ch:"table"`
 	Column   string   `ch:"column"`
 	Types    []string `ch:"uniq_types"`
 }
 
-// CheckSystemPartsColumns check data parts types consistency https://github.com/Altinity/clickhouse-backup/issues/529#issuecomment-1554460504
 func (ch *ClickHouse) CheckSystemPartsColumns(ctx context.Context, table *Table) error {
 	tables := []Table{*table}
 	return ch.CheckSystemPartsColumnsForTables(ctx, tables)
 }
 
-// CheckSystemPartsColumnsForTables checks data parts types consistency for multiple tables using a single SQL query
-// This avoids having unfrozen data parts if only one table contains inconsistent column data types
 func (ch *ClickHouse) CheckSystemPartsColumnsForTables(ctx context.Context, tables []Table) error {
 	if len(tables) == 0 {
 		return nil