feat(database): add database indexes to schema_version entity and mig…

[ajulaybeeb]

Summary

• Added @Index decorators to src/entities/schema_version.entity.ts covering schemaName, checksum, createdAt, and composite ("schemaName", "createdAt").
• Added migration src/migrations/1804000000000-add-schema-version-indexes.ts to create these indexes on existing databases with idempotent IF NOT EXISTS clauses and reversible down() method.

Why

The schema_version table lacked indexes on its primary lookup, filtering, and sorting columns (schemaName, checksum, createdAt). As the table grows, lookups by schema name and chronological history ordering force sequential scans. Adding targeted B-tree indexes ensures high-performance lookups and prevents schema drift between the TypeORM entity and the database.

Implementation

• src/entities/schema_version.entity.ts:
  • Imported Index from typeorm.
  • Added @Index('IDX_schema_version_schemaName', ['schemaName']).
  • Added @Index('IDX_schema_version_checksum', ['checksum']).
  • Added @Index('IDX_schema_version_createdAt', ['createdAt']).
  • Added composite @Index('IDX_schema_version_schemaName_createdAt', ['schemaName', 'createdAt']).
• src/migrations/1804000000000-add-schema-version-indexes.ts:
  • Implemented AddSchemaVersionIndexes1804000000000 with up() creating all 4 indexes and down() dropping them.

Testing

• Verified syntax, entity decorator definitions, and TypeORM migration interface compliance.
• Verified timestamp ordering and uniqueness adherence with src/migrations/migration-timestamps.spec.ts.

Scope / Risk

• Scope is strictly confined to schema_version entity and the new migration file.
• Non-breaking change; uses IF NOT EXISTS to safely run across all environments.

Issue

Closes #1239

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