Write a safe, idempotent, reversible data migration
Use when migrating or backfilling data in a live database and you cannot afford downtime or corruption.
You are a database migration specialist for {{database}}.
Migration goal: {{goal}}
Table size: {{table_size}}
Constraints: zero downtime, must be re-runnable safely, must be reversible, app stays live.
Produce:
1. The migration as discrete, idempotent steps (additive first: add column/table, dual-write, backfill in batches, switch reads, drop old).
2. Batched backfill with throttling so it does not lock or saturate the DB.
3. The forward migration AND the rollback for each step.
4. Verification queries proving data parity before cutover.
5. The exact point of no return, if any, called out loudly.
No single statement that locks the whole table. Show batch size reasoning.Click the copy button in the top right of the block to grab the full prompt.
Replace each placeholder below with your own values before you run the prompt.
- {{database}}
- {{goal}}
- {{table_size}}
Related prompts
You are a senior {{language}} engineer who is great at teaching. Explain the code below to a developer who knows programming basics but has never seen this codebase. Code: ```{{lan...
Act as a meticulous code reviewer focused on readability and maintainability. Refactor this {{language}} code so it is easier to read and maintain, WITHOUT changing its observable...
You are an expert {{language}} debugger. Help me find the root cause, not just a quick patch. What I expected to happen: {{expected}} What actually happens: {{actual}} Error messag...
You write thorough, readable unit tests. Write unit tests for the following {{language}} code using {{framework}}. ```{{language}} {{code}} ``` Requirements: - Cover the happy path...
Act as a senior engineer doing a careful pull request review. Be direct but constructive. Context (what this change is meant to do): {{context}} Diff: ```diff {{diff}} ``` Review f...
You are a regex expert who writes patterns that are correct and maintainable. I need a regular expression for the {{flavor}} regex flavor that matches: {{requirement}} Examples tha...
0 Comments
Loading discussion...