move to custom model type which indexed created_at

db/price.go

@@ -4,13 +4,11 @@ import (
 	"errors"
 	"math"
 	"time"
-
-	"gorm.io/gorm"
 )
 
 // Price is a given price entry for an asset
 type Price struct {
-	gorm.Model
+	Model
 	Type     Asset `gorm:"varchar(255)"`
 	USDPrice float64
 }

db/total_supply.go

@@ -1,10 +1,8 @@
 package db
 
-import "gorm.io/gorm"
-
 // TotalSupply is used to track the total supply of a given asset
 type TotalSupply struct {
-	gorm.Model
+	Model
 	Type   string
 	Supply float64
 }

db/tvl.go

@@ -1,10 +1,8 @@
 package db
 
-import "gorm.io/gorm"
-
 // TotalValueLocked records the USD value of funds locked within index pool
 type TotalValueLocked struct {
-	gorm.Model
+	Model
 	PoolName    string
 	ValueLocked float64
 }

db/utils.go

@@ -0,0 +1,15 @@
+package db
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// Model is a copy of the gorm model type but using slightly different configurations
+type Model struct {
+	ID        uint      `gorm:"primarykey"`
+	CreatedAt time.Time `gorm:"index"` // this is changed to include the index
+	UpdatedAt time.Time
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+}