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Support fine-grained database schema migrations #11668

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Support fine-grained database schema migrations #11668

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Commits on Oct 25, 2024

  1. Support fine-grained database schema migrations 

    Backward-compatible schema changes (e.g. those that add tables or
nullable columns) now no longer need a change to the global schema
file (/nix/var/nix/db/schema). Thus, old Nix versions can continue to
access the database.

This is especially useful for schema changes required by experimental
features. In particular, it replaces the ad-hoc handling of the schema
changes for CA derivations (i.e. the file /nix/var/nix/db/ca-schema).

Schema versions 8 and 10 could have been handled by this mechanism in
a backward-compatible way as well.
    @edolstra
    edolstra committed Oct 25, 2024
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