diff --git a/api/main.go b/api/main.go
index 4cdf032ba..f4a31ff44 100644
--- a/api/main.go
+++ b/api/main.go
@@ -167,7 +167,14 @@ func main() {
 
 	app.Use(requestid.New())
 	app.Use(logger.New(logger.Config{
-		Format: "level=info timestamp=${time} method=${method} path=${path} status${status} request_id=${locals:requestid}\n",
+		Format: "level=info timestamp=${time} method=${method} path=${path} latency=${latency} status${status} request_id=${locals:requestid}\n",
+		Next: func(c *fiber.Ctx) bool {
+			path := c.Path()
+			if path == "/api/v1/health" || path == "/api/v1/ready" {
+				return true
+			}
+			return false
+		},
 	}))
 	if cfg.PprofEnabled {
 		app.Use(pprof.New())
diff --git a/deploy/api/env/production-mainnet.env b/deploy/api/env/production-mainnet.env
index 4d91e0b5d..c28e1288d 100644
--- a/deploy/api/env/production-mainnet.env
+++ b/deploy/api/env/production-mainnet.env
@@ -2,7 +2,7 @@ ENVIRONMENT=production-mainnet
 NAMESPACE=wormscan
 NAME=wormscan-api
 PORT=8000
-REPLICAS=2
+REPLICAS=4
 IMAGE_NAME=
 RESOURCES_LIMITS_MEMORY=256Mi
 RESOURCES_LIMITS_CPU=500m
diff --git a/parser/cmd/service/run.go b/parser/cmd/service/run.go
index 1a8b3b0dd..ab4fbb30d 100644
--- a/parser/cmd/service/run.go
+++ b/parser/cmd/service/run.go
@@ -21,6 +21,7 @@ import (
 	parserAlert "github.com/wormhole-foundation/wormhole-explorer/parser/internal/alert"
 	"github.com/wormhole-foundation/wormhole-explorer/parser/internal/metrics"
 	"github.com/wormhole-foundation/wormhole-explorer/parser/internal/sqs"
+	"github.com/wormhole-foundation/wormhole-explorer/parser/migration"
 	"github.com/wormhole-foundation/wormhole-explorer/parser/parser"
 	"github.com/wormhole-foundation/wormhole-explorer/parser/processor"
 	"github.com/wormhole-foundation/wormhole-explorer/parser/queue"
@@ -58,6 +59,12 @@ func Run() {
 		logger.Fatal("failed to connect MongoDB", zap.Error(err))
 	}
 
+	// run the database migration.
+	err = migration.Run(db.Database)
+	if err != nil {
+		logger.Fatal("error running migration", zap.Error(err))
+	}
+
 	// get alert client.
 	alertClient, err := newAlertClient(config)
 	if err != nil {
diff --git a/parser/migration/migration.go b/parser/migration/migration.go
new file mode 100644
index 000000000..8aa53e6e9
--- /dev/null
+++ b/parser/migration/migration.go
@@ -0,0 +1,37 @@
+package migration
+
+import (
+	"context"
+	"errors"
+
+	"github.com/wormhole-foundation/wormhole-explorer/parser/parser"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+// TODO: move this to migration tool that support mongodb.
+func Run(db *mongo.Database) error {
+	// Created parsedVaa collection.
+	err := db.CreateCollection(context.TODO(), parser.ParsedVAACollection)
+	if err != nil && isNotAlreadyExistsError(err) {
+		return err
+	}
+
+	// create index in observations collection by indexedAt.
+	indexToAddress := mongo.IndexModel{Keys: bson.D{{Key: "standardizedProperties.toAddress", Value: 1}}}
+	_, err = db.Collection(parser.ParsedVAACollection).Indexes().CreateOne(context.TODO(), indexToAddress)
+	if err != nil && isNotAlreadyExistsError(err) {
+		return err
+	}
+
+	return nil
+}
+
+func isNotAlreadyExistsError(err error) bool {
+	target := &mongo.CommandError{}
+	isCommandError := errors.As(err, target)
+	if !isCommandError || err.(mongo.CommandError).Code != 48 {
+		return true
+	}
+	return false
+}
diff --git a/parser/parser/repository.go b/parser/parser/repository.go
index 434d65545..2dbfd8495 100644
--- a/parser/parser/repository.go
+++ b/parser/parser/repository.go
@@ -14,6 +14,8 @@ import (
 // repository errors
 var ErrDocNotFound = errors.New("NOT FOUND")
 
+const ParsedVAACollection = "parsedVaa"
+
 // Repository definitions.
 type Repository struct {
 	db          *mongo.Database
@@ -28,7 +30,7 @@ func NewRepository(db *mongo.Database, log *zap.Logger) *Repository {
 	return &Repository{db, log, struct {
 		parsedVaa *mongo.Collection
 	}{
-		parsedVaa: db.Collection("parsedVaa"),
+		parsedVaa: db.Collection(ParsedVAACollection),
 	}}
 }