pub struct ColumnSchema {
    pub name: &'static str,
    pub rust_type: &'static str,
    pub nullable: bool,
    pub primary_key: bool,
    pub unique: bool,
    pub autoincrement: bool,
    pub default_expr: Option<&'static str>,
}

The SQL column name.

The Rust type name as a canonical string (spaces stripped).

Whether this column is nullable.

Whether this column is the primary key.

Whether this column has a UNIQUE constraint.

Whether this column auto-increments.

Raw SQL default expression, if any.