Deletion Protected

LifeCycle.DELETION_PROTECTED allows MooseStack to automatically add new database structures but prevents it from removing existing ones. This mode is perfect for production environments where you want to evolve your schema safely without risking data loss.

Behavior

What Moose will do:

Add new columns, tables
Modify column types (if compatible)
Update non-destructive configurations

What Moose won't do:

Drop columns or tables
Perform destructive schema changes

Examples

DeletionProtectedExample.py

from moose_lib import OlapTable, OlapConfig, LifeCycle, ClickHouseEnginesfrom pydantic import BaseModelfrom datetime import datetime class ProductEvent(BaseModel):    id: str    product_id: str    timestamp: datetime    action: str product_analytics = OlapTable[ProductEvent]("product_analytics", OlapConfig(    order_by_fields=["timestamp", "product_id"],    engine=ClickHouseEngines.ReplacingMergeTree,    life_cycle=LifeCycle.DELETION_PROTECTED))

DeletionProtectedExample.ts

import { OlapTable, LifeCycle, ClickHouseEngines } from "@514labs/moose-lib"; interface ProductEvent {  id: string;  productId: string;  timestamp: Date;  action: string;} const productAnalytics = new OlapTable<ProductEvent>("product_analytics", {  orderByFields: ["timestamp", "productId"],  engine: ClickHouseEngines.ReplacingMergeTree,  lifeCycle: LifeCycle.DELETION_PROTECTED});