## Bug: V ORM `default:` attribute strips string quotes, generating invalid SQL

[Jengro777]

Minimal Reproduction

Model (model.v):

module main
import time

@[table: 'demo_default']
pub struct DemoDefault {
    id        string    @[primary; sql_type: 'CHAR(36)']
    home_path string    @[default: '/dashboard'; sql_type: 'VARCHAR(255)']
    tags      string    @[default: '["all"]'; sql_type: 'VARCHAR(1000)']
    name      string    @[default: '"我的团队"'; sql_type: 'VARCHAR(100)']
    method    string    @[default: 'POST'; sql_type: 'VARCHAR(32)']
    created_at time.Time @[sql_type: 'TIMESTAMP']
}

Init (main.v):

module main
import db.pg

fn main() {
    mut db := pg.connect(host: 'localhost', user: 'test', password: 'test', dbname: 'test')!

    sql db {
        create table DemoDefault
    }!
    println('OK')
}

Generated DDL (from -d trace_orm):

CREATE TABLE IF NOT EXISTS "demo_default" (
    "id" CHAR(36) NOT NULL,
    "home_path" VARCHAR(255) DEFAULT /dashboard NOT NULL,   -- ← unquoted, syntax error
    "tags" VARCHAR(1000) DEFAULT ["all"] NOT NULL,           -- ← unquoted, syntax error
    "name" VARCHAR(100) DEFAULT "我的团队" NOT NULL,          -- ← unquoted, syntax error
    "method" VARCHAR(32) DEFAULT POST NOT NULL,              -- ← treated as column ref
    "created_at" TIMESTAMP NOT NULL,
    PRIMARY KEY("id")
);

Error (PostgreSQL):

ERROR:  syntax error at or near "/"
LINE 1: ... VARCHAR(255) DEFAULT /dashboard NOT NULL...

Root Cause

V ORM's default: attribute renders the V expression value directly into SQL without SQL string escaping:

• default: '/dashboard' → DEFAULT /dashboard (missing quotes around string)
• default: 'POST' → DEFAULT POST (treated as column reference in PG)
• default: 0 → DEFAULT 0 (works because numbers don't need quoting)

The default: value is a V expression (V string literal '/dashboard'), but it needs to be rendered as a SQL literal ('/dashboard' with quotes) in the DDL.

Expected Behavior

V string defaults should be properly quoted in generated SQL:

"home_path" VARCHAR(255) DEFAULT '/dashboard' NOT NULL
"tags" VARCHAR(1000) DEFAULT '["all"]' NOT NULL

Or alternatively, support default: sql('/dashboard') for raw SQL expressions.

Workaround

Move the default into sql_type:

home_path string @[sql_type: "VARCHAR(255) DEFAULT '/dashboard'"]

This works because sql_type is rendered as raw SQL — but it's fragile and mixes type definition with default value.

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