chore: fix postgres stmts

store/db/postgres/common.go

@@ -1,9 +1,26 @@
 package postgres
 
-import "google.golang.org/protobuf/encoding/protojson"
+import (
+	"fmt"
+	"strings"
+
+	"google.golang.org/protobuf/encoding/protojson"
+)
 
 var (
 	protojsonUnmarshaler = protojson.UnmarshalOptions{
 		DiscardUnknown: true,
 	}
 )
+
+func placeholder(n int) string {
+	return "$" + fmt.Sprint(n)
+}
+
+func placeholders(n int) string {
+	list := []string{}
+	for i := 0; i < n; i++ {
+		list = append(list, placeholder(i+1))
+	}
+	return strings.Join(list, ", ")
+}