database-migrations
Creates safe database migrations with proper indexes and rollback strategies. Use when creating tables, adding columns, creating indexes, handling zero-downtime migrations, or when user mentions migrations, schema changes, or database structure.
89
88%
Does it follow best practices?
Impact
85%
1.34xAverage score across 3 eval scenarios
Passed
No known issues
Evaluation results
100%
16%Slow Query Performance on Orders Table
Safe concurrent index creation
disable_ddl_transaction!
100%
100%
algorithm: :concurrently
100%
100%
if_not_exists: true
0%
100%
Composite index column order
100%
100%
Partial index where clause
100%
100%
Foreign key indexed
100%
100%
Migration version [8.0]
100%
100%
Reversible migrations
100%
100%
No direct add_index without concurrently
100%
100%
Index name specified
0%
100%
100%
20%Migrate Product Price Column to Decimal Precision
Safe column type change with batched backfill
No change_column
100%
100%
New column added first
100%
100%
Batched backfill
100%
100%
sleep in batch loop
0%
100%
disable_ddl_transaction! on data migration
100%
100%
safety_assured on remove_column
0%
100%
Old column removed
100%
100%
Migration version [8.0]
100%
100%
Reversible migrations
100%
100%
Separate migration files
100%
100%
57%
31%Add Shipment Tracking to the Orders System
NOT NULL constraint and enum column migration
Two-step NOT NULL
0%
0%
Initial column nullable
0%
50%
Enum uses :integer type
0%
100%
Enum default: 0
0%
100%
Enum column indexed
100%
100%
on_delete specified
0%
0%
Migration version [8.0]
100%
100%
Reversible migrations
100%
100%
change_column_null usage
0%
0%
Enum model declaration
0%
100%
- Repository
- ThibautBaissac/rails_ai_agents
- Commit
15fdeaf
- Evaluated
- Agent
- Claude Code
- Model
- Claude Sonnet 4.6
Table of Contents
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