add left pack algo

db/db.go

@@ -19,6 +19,7 @@ type DB interface {
 	RemoveFile(fileMetadata types.FileMetadata) error
 	StoreFilePartition(fileMetadata types.FileMetadata) error
 	GetTotalSize() (int64, error)
+	RemovePartitionAssignment() error
 	GetFileCount() (int64, error)
 	GetFiles() ([]types.FileMetadata, error)
 }
@@ -120,6 +121,15 @@ func (d *store) StoreFilePartition(fileMetadata types.FileMetadata) error {
 	return nil
 }
 
+func (d *store) RemovePartitionAssignment() error {
+	query := `UPDATE files SET partitionId = ''`
+	_, err := d.db.Exec(query)
+	if err != nil {
+		return fmt.Errorf("error removing partition assignment | %w", err)
+	}
+	return nil
+}
+
 func (d *store) GetTotalSize() (int64, error) {
 	var size int64
 	query := `SELECT SUM(size) FROM files`