-- Extension of the sql schema for content-addressed derivations.
-- Won't be loaded unless the experimental feature `ca-derivations`
-- is enabled

create table if not exists Realisations (
    id integer primary key autoincrement not null,
    drvPath text not null,
    outputName text not null, -- symbolic output id, usually "out"
    outputPath integer not null,
    signatures text, -- space-separated list
    foreign key (outputPath) references ValidPaths(id) on delete cascade
);

create index if not exists IndexRealisations on Realisations(drvPath, outputName);

create table if not exists RealisationsRefs (
    referrer integer not null,
    realisationReference integer,
    foreign key (referrer) references Realisations(id) on delete cascade,
    foreign key (realisationReference) references Realisations(id) on delete restrict
);

-- used by QueryRealisationReferences
create index if not exists IndexRealisationsRefs on RealisationsRefs(referrer);
-- used by cascade deletion when ValidPaths is deleted
create index if not exists IndexRealisationsRefsOnOutputPath on Realisations(outputPath);