safe-migrate 0.6.0

Sync PostgreSQL metadata, then lint migrations offline
Documentation 
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use crate::ast::identifiers::ObjectId;
use serde::{Deserialize, Serialize};

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

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum TypeKind {
    Enum {
        variants: Vec<String>,
    },
    Domain {
        base_type: String,
        /// Derived from `base_type` when a cache enters analysis. Keeping it
        /// out of the cache preserves the stable binary representation.
        #[serde(skip)]
        base_type_id: Option<ObjectId>,
    },
    Base,
    Composite,
    Range,
}

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