[nightshift] backward-compat: schema versioning, policy version, rate-limit key versioning#8
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…, rate-limit key versioning - Add schema_migrations table to track applied migrations in order, replacing the unversioned DDL approach. Idempotent and safe for rolling upgrades. - Add optional 'version' field to Policy YAML. Defaults to '1' for existing files. Rejects unknown versions with a clear error message. - Add rateLimitKeyVersion prefix to all Redis rate-limit keys so future format changes don't collide with existing counters. - Document ForRole nil-return behavior for unrecognized role names. All existing tests pass. No new dependencies.
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Automated by Nightshift v3 (GLM 5.1).
Task: backward-compat
Category: pr
Changes:
schema_migrationstracking. Creates tracking table first, applies only pending migrations. Idempotent on every startup.versionfield to policy YAML. Defaults to"1"for existing files without the field. Rejects unknown versions with a clear error message for future-proofing.rateLimitKeyVersionprefix (v1) to all Redis rate-limit keys. Future format changes won't collide with or misinterpret existing counters.ForRolenil-return behavior for unrecognized role names.All existing tests pass. No new dependencies. Backward-compatible — existing deployments, policy files, and Redis state work unchanged.