(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/bite/converter.go

@@ -73,8 +73,7 @@ func (converter BiteConverter) ToModels(entities []interface{}) ([]interface{},
 		flip := biteEntity.Flip
 		logIdx := biteEntity.LogIndex
 		txIdx := biteEntity.TransactionIndex
-		rawLogJson, err := json.Marshal(biteEntity.Raw)
-		rawLogString := string(rawLogJson)
+		rawLog, err := json.Marshal(biteEntity.Raw)
 		if err != nil {
 			return nil, err
 		}
@@ -89,7 +88,7 @@ func (converter BiteConverter) ToModels(entities []interface{}) ([]interface{},
 			NFlip:            shared.BigIntToString(flip),
 			LogIndex:         logIdx,
 			TransactionIndex: txIdx,
-			Raw:              rawLogString,
+			Raw:              rawLog,
 		}
 		models = append(models, model)
 	}

pkg/transformers/bite/converter_test.go

@@ -79,7 +79,7 @@ var _ = Describe("Bite Converter", func() {
 				Tab:              "",
 				NFlip:            "",
 				TransactionIndex: 0,
-				Raw:              string(emptyLog),
+				Raw:              emptyLog,
 			}
 			models, err := converter.ToModels([]interface{}{emptyEntity})
 

pkg/transformers/bite/model.go

@@ -24,5 +24,5 @@ type BiteModel struct {
 	NFlip            string
 	LogIndex         uint   `db:"log_idx"`
 	TransactionIndex uint   `db:"tx_idx"`
-	Raw              string `db:"raw_log"`
+	Raw              []byte `db:"raw_log"`
 }

pkg/transformers/bite/repository.go

@@ -41,7 +41,14 @@ func (repository BiteRepository) Create(headerID int64, models []interface{}) er
 			tx.Rollback()
 			return fmt.Errorf("model of type %T, not %T", model, BiteModel{})
 		}
-		_, err := tx.Exec(
+
+		err = shared.ValidateHeaderConsistency(headerID, biteModel.Raw, repository.db)
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+
+		_, err = tx.Exec(
 			`INSERT into maker.bite (header_id, ilk, urn, ink, art, iart, tab, nflip, log_idx, tx_idx, raw_log)
         VALUES($1, $2, $3, $4::NUMERIC, $5::NUMERIC, $6::NUMERIC, $7::NUMERIC, $8::NUMERIC, $9, $10, $11)`,
 			headerID, biteModel.Ilk, biteModel.Urn, biteModel.Ink, biteModel.Art, biteModel.IArt, biteModel.Tab, biteModel.NFlip, biteModel.LogIndex, biteModel.TransactionIndex, biteModel.Raw,
@@ -51,6 +58,7 @@ func (repository BiteRepository) Create(headerID int64, models []interface{}) er
 			return err
 		}
 	}
+
 	err = shared.MarkHeaderCheckedInTransaction(headerID, tx, constants.BiteChecked)
 	if err != nil {
 		tx.Rollback()