[ORM] Add a prefix character for query variables

[valipan]

Can orm query have a special character for variables like '@' which is used in web templates?

Let's say we have the situation

Table [User] {
	id int
	name text
	teamid int
}

if I want to select all users with/without team filter I can do this

teamid := WEB_POST_FORM_VALUE // 0 - not set ; positive value for a specific team

users := sql db {
 select from User where (@teamid == 0 || teamid == @teamid)
}

Right now, without prefix character it is confusing what is columns, what is variable.

The code will be more clear and with less bugs.