codegen: implement auto-timestamps for created_at and updated_at

pkg/schema/table.go

@@ -46,6 +46,18 @@ type Table struct {
 	GoTypeName string
 }
 
+func (t Table) HasAutoTimestamps() (hasCreatedAt bool, hasUpdatedAt bool) {
+	for _, c := range t.Columns {
+		if c.Name == "created_at" && c.Type == "integer" {
+			hasCreatedAt = true
+		}
+		if c.Name == "updated_at" && c.Type == "integer" {
+			hasUpdatedAt = true
+		}
+	}
+	return
+}
+
 type Index struct {
 	Name      string `db:"index_name"`
 	TableName string `db:"table_name"`