- serialise publishes per crate with an advisory lock in one transaction
- add a unique index on normalised name and version without build metadata
- validate versions as strict SemVer 2.0 and reject an empty .crate
- renumber the migration to 0005
- serve sparse index and config.json for local cargo repos from a cargo_index table
- add Web API publish, yank and unyank under the local repo api root
- drop index lines when the crate file is deleted