DB Migration Safety Checker
The migration ran instantly in staging and locked a 40-million-row table in production for nine minutes — because staging had 400 rows
- Audit migrations for potential table locks and downtime.
- Generate zero-downtime expand-contract migration scripts.
- Calculate estimated execution time based on table volume.
$9.99
· or 50 creditsSecure checkout via Stripe
Included in download
- Audit migrations for potential table locks and downtime.
- Generate zero-downtime expand-contract migration scripts.
Sample input
Review this Postgres 12 migration: ALTER TABLE orders ADD COLUMN internal_note text DEFAULT 'none' NOT NULL; Production table has 50M rows.
Sample output
Risk: High. In Postgres 12, adding a column with a volatile default requires a full table rewrite, locking orders for minutes. Plan:
- Add column without default.
- Set default for new rows.
- Batch update existing rows (50k chunks).
- Add NOT NULL constraint.
The migration ran instantly in staging and locked a 40-million-row table in production for nine minutes — because staging had 400 rows
$9.99
· or 50 creditsSecure checkout via Stripe
Included in download
- Audit migrations for potential table locks and downtime.
- Generate zero-downtime expand-contract migration scripts.
- Instant install
Sample input
Review this Postgres 12 migration: ALTER TABLE orders ADD COLUMN internal_note text DEFAULT 'none' NOT NULL; Production table has 50M rows.
Sample output
Risk: High. In Postgres 12, adding a column with a volatile default requires a full table rewrite, locking orders for minutes. Plan:
- Add column without default.
- Set default for new rows.
- Batch update existing rows (50k chunks).
- Add NOT NULL constraint.
About This Skill
The migration ran instantly in staging and locked a 40-million-row table in production for nine minutes — because staging had 400 rows. This skill audits your migration before it touches production: lock acquisition analysis, estimated execution time at your actual data volume, index build strategy (concurrent vs. blocking), column default pitfalls, constraint validation timing, and the exact zero-downtime sequence if your migration needs one. It also writes the rollback script, because migrations that can't be undone shouldn't be run without one. Use it on every migration that touches a table with more than 10,000 rows, adds a NOT NULL column, drops anything, or runs during business hours. Give it your migration file and your production table sizes; it returns the risk assessment and the safe execution plan.
Use Cases
- Audit migrations for potential table locks and downtime.
- Generate zero-downtime expand-contract migration scripts.
- Calculate estimated execution time based on table volume.
- Produce safe rollback scripts for every schema change.
Known Limitations
- Cannot verify actual production load or existing lock contention in real-time.
- Accuracy depends on providing the correct DB engine and version.
How to Install
mkdir -p ~/.claude/skills && curl -sL https://www.agensi.io/api/install/db-migration-safety-checker -o /tmp/db-migration-safety-checker.zip && unzip -o /tmp/db-migration-safety-checker.zip -d ~/.claude/skills && rm /tmp/db-migration-safety-checker.zipFree skills install directly. Paid skills require purchase - use the download button above after buying.
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Compatible with SKILL.md-compatible agents like Claude Code and Cursor.
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