# Fihtony Constellation Constellation Database Delivery > Database Delivery - Skill: `tomevault-io/fihtony-constellation-constellation-database-delivery` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/fihtony-constellation-constellation-database-delivery` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/fihtony-constellation-constellation-database-delivery/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/fihtony-constellation-constellation-database-delivery --- # Database Delivery ## When To Apply - Schema evolution, migrations, query changes, repository/data-access edits, or performance-sensitive persistence work. - Any feature that changes stored data shape, constraints, lifecycle, or reporting behavior. - Review of SQL, ORM usage, indexing, or data consistency assumptions. ## Build Rules - Model the data change explicitly: current state, target state, migration path, and rollback path. - Prefer additive, reversible migrations unless destructive changes are explicitly justified. - Keep queries correct before optimizing them; then remove obvious scans, N+1 patterns, and unnecessary round trips. - Enforce integrity in the data model or persistence boundary, not only in UI code. ## Safety Checklist - Consider nullability, defaults, uniqueness, foreign-key relationships, and backfill behavior. - Verify the effect on existing reads and writes, not just the new happy path. - For performance-sensitive changes, document expected indexes, query filters, and sort paths. - Include tests that prove the persistence behavior or query contract required by the feature. ## Review Standards - Reject schema changes with no migration story. - Reject query changes that are hard to reason about, unbounded by default, or likely to regress under production-sized data. - Reject persistence logic that leaks storage details across unrelated layers. --- > Source: [fihtony/constellation](https://github.com/fihtony/constellation) — distributed by [TomeVault](https://tomevault.io).