Module database 

Module database utilities

Each module has its own database at {data_dir}/db/. Use this helper to open it. Modules use the same format as the node by default (via MODULE_CONFIG_DATABASE_BACKEND).

Structs

MigrationContext

Context passed to migration functions. Provides put/get/delete against the module’s schema tree and access to the database for opening other trees.

Functions

open_module_db

Open the module’s database at {data_dir}/db/.

run_migrations

Run pending up migrations. Opens the “schema” tree, reads current version, runs each migration with version > current in order, then updates schema_version.

run_migrations_down

Rollback migrations down to target_version (exclusive). Runs down migrations in reverse order for each applied version > target_version. Requires down functions to be provided.

run_migrations_with_down

Run pending up migrations. Supports optional down migrations for rollback.

Type Aliases

Migration

Migration pair: (version, up, optional down for rollback).

MigrationDown

A single down migration step (for rollback).

MigrationUp

A single up migration step.