Module migration 

Available on crate feature memory only.

Lightweight, embedded migration runner for SQL-backed memory services.

This module provides shared types and free functions that track applied schema versions in a per-backend registry table and execute only unapplied forward-only migration steps.

The types (MigrationStep, AppliedMigration, MigrationError) are always compiled. The SQL runner functions (run_sql_migrations, sql_schema_version) require the sqlite-memory or database-memory feature.

Structs

AppliedMigration

Record of an applied migration stored in the registry table.

MigrationError

Error context for a failed migration step.

MigrationStep

A single forward-only migration step.