VDB-120 include tic in dent and tend (#118)

* Add constants for TTL and tic for fakeHeader

* Add tic to tend transformer

* Update tests for tend

* Fix string conversion bug in fakes

* Fix tend integration tests after staging rebase

* Add tic to dent transformer

* Update dent tests

* Change integration tests to use hardcoded block timestamp

pkg/transformers/shared/constants/data.go

@@ -1,3 +1,6 @@
 package constants
 
 var DataItemLength = 32
+
+// TODO Grab this from DB, since it can change through governance
+var TTL = int64(10800) // 60 * 60 * 3 == 10800 seconds == 3 hours

pkg/transformers/shared/utilities.go

@@ -15,6 +15,7 @@
 package shared
 
 import (
+	"database/sql"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
 	"math/big"
 )
@@ -78,3 +79,15 @@ func convert(conversion string, value string, precision int) string {
 	}
 	return result.Text('f', precision)
 }
+
+// Grabs the block timestamp for an headerID, and adds the TTL constant
+func GetTicInTx(headerID int64, tx *sql.Tx) (int64, error) {
+	var blockTimestamp int64
+	err := tx.QueryRow(`SELECT block_timestamp FROM public.headers WHERE id = $1;`, headerID).Scan(&blockTimestamp)
+	if err != nil {
+		return 0, err
+	}
+
+	tic := blockTimestamp + constants.TTL
+	return tic, nil
+}