(VDB-68) Verify log block hash matches header block hash

- Delete header on conflict to prompt data refresh (cascade deletes all
  data associated with that block)
- Derive header hash from rpc payload rather than computing it from data
  (prevents hash mismatch between blockchain and cache)

pkg/transformers/cat_file/chop_lump/repository.go

@@ -39,7 +39,13 @@ func (repository CatFileChopLumpRepository) Create(headerID int64, models []inte
 			return fmt.Errorf("model of type %T, not %T", model, CatFileChopLumpModel{})
 		}
 
-		_, err := tx.Exec(
+		err = shared.ValidateHeaderConsistency(headerID, chopLump.Raw, repository.db)
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+
+		_, err = tx.Exec(
 			`INSERT into maker.cat_file_chop_lump (header_id, ilk, what, data, tx_idx, log_idx, raw_log)
 			VALUES($1, $2, $3, $4::NUMERIC, $5, $6, $7)`,
 			headerID, chopLump.Ilk, chopLump.What, chopLump.Data, chopLump.TransactionIndex, chopLump.LogIndex, chopLump.Raw,