utxocache: Set new backend info with version one.

When starting a utxo database that does not have db info yet, the
version must be the initial one so set as such rather than the current
version. This ensures crucial updates are not skipped.

internal/blockchain/compress.go

@@ -13,6 +13,10 @@ import (
 	"github.com/decred/dcrd/txscript/v4"
 )
 
+// initialCompressionVersion is the initial script compression version of the
+// database.
+const initialCompressionVersion = 1
+
 // currentCompressionVersion is the current script compression version of the
 // database.
 const currentCompressionVersion = 1

internal/blockchain/utxobackend.go

@@ -713,11 +713,23 @@ func (l *levelDbUtxoBackend) createUtxoBackendInfo(blockDBVersion uint32) error
 		utxoVer = 1
 	}
 
+	// Utxo Backend info was added at blockDbVersion 9. Opening a db before
+	// that will make it here and the utxo database must go through
+	// updates. Both the utxo database version and compression version were
+	// 1 at that time. A blockDbVersion after 9 means this is a new empty
+	// database so the newest version is set.
+	utxoDatabaseVersion := 1
+	compressionVersion := 1
+	if blockDBVersion > 9 {
+		utxoDatabaseVersion = currentUtxoDatabaseVersion
+		compressionVersion = currentCompressionVersion
+	}
+
 	// Write the creation and version information to the database.
 	return l.Update(func(tx UtxoBackendTx) error {
 		return l.dbPutUtxoBackendInfo(tx, &UtxoBackendInfo{
-			version: currentUtxoDatabaseVersion,
-			compVer: currentCompressionVersion,
+			version: uint32(utxoDatabaseVersion),
+			compVer: uint32(compressionVersion),
 			utxoVer: utxoVer,
 			created: time.Now(),
 		})