Write event logs to database before transforming

- enables decoupling event extraction/persistence from transformation
- modifies event transformer, converter, and log chunker to accept
  payload that includes internal log database ID with log data
- remove alias for transformer pkg as shared_t
- remove unused mock watcher repository

libraries/shared/test_data/generic.go

@@ -17,6 +17,7 @@
 package test_data
 
 import (
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"math/rand"
 	"time"
 
@@ -30,28 +31,42 @@ type GenericModel struct{}
 type GenericEntity struct{}
 
 var startingBlockNumber = rand.Int63()
-var topic = "0x" + randomString(64)
-var address = "0x" + randomString(38)
+var topic0 = "0x" + randomString(64)
 
-var GenericTestLogs = []types.Log{{
-	Address:     common.HexToAddress(address),
-	Topics:      []common.Hash{common.HexToHash(topic)},
-	BlockNumber: uint64(startingBlockNumber),
-}}
+var GenericTestLog = func() types.Log {
+	return types.Log{
+		Address:     fakeAddress(),
+		Topics:      []common.Hash{common.HexToHash(topic0), fakeHash()},
+		Data:        hexutil.MustDecode(fakeHash().Hex()),
+		BlockNumber: uint64(startingBlockNumber),
+		TxHash:      fakeHash(),
+		TxIndex:     uint(rand.Int31()),
+		BlockHash:   fakeHash(),
+		Index:       uint(rand.Int31()),
+	}
+}
 
 var GenericTestConfig = transformer.EventTransformerConfig{
 	TransformerName:     "generic-test-transformer",
-	ContractAddresses:   []string{address},
+	ContractAddresses:   []string{fakeAddress().Hex()},
 	ContractAbi:         randomString(100),
-	Topic:               topic,
+	Topic:               topic0,
 	StartingBlockNumber: startingBlockNumber,
 	EndingBlockNumber:   startingBlockNumber + 1,
 }
 
+func fakeAddress() common.Address {
+	return common.HexToAddress("0x" + randomString(40))
+}
+
+func fakeHash() common.Hash {
+	return common.HexToHash("0x" + randomString(64))
+}
+
 func randomString(length int) string {
 	var seededRand = rand.New(
 		rand.NewSource(time.Now().UnixNano()))
-	charset := "abcdefghijklmnopqrstuvwxyz1234567890"
+	charset := "abcdef1234567890"
 	b := make([]byte, length)
 	for i := range b {
 		b[i] = charset[seededRand.Intn(len(charset))]