safe-migrate 0.4.0

Lint PostgreSQL migrations against live database statistics to prevent blocking locks
Documentation 
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use crate::ast::identifiers::ObjectId;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct TriggerState {
    pub id: ObjectId,
    pub table_id: ObjectId,
    pub generation: u64,
}

#[derive(Debug, Clone, PartialEq)]
pub enum TriggerOverlay {
    Present(TriggerState),
    Dropped,
}