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create table if not exists ValidPaths (
id integer primary key autoincrement not null,
path text unique not null,
hash text not null,
registrationTime integer not null,
deriver text
);
create table if not exists Refs (
referrer integer not null,
reference integer not null,
primary key (referrer, reference),
foreign key (referrer) references ValidPaths(id) on delete cascade,
foreign key (reference) references ValidPaths(id) on delete restrict
);
create index if not exists IndexReferrer on Refs(referrer);
create index if not exists IndexReference on Refs(reference);
-- Paths can refer to themselves, causing a tuple (N, N) in the Refs
-- table. This causes a deletion of the corresponding row in
-- ValidPaths to cause a foreign key constraint violation (due to `on
-- delete restrict' on the `reference' column). Therefore, explicitly
-- get rid of self-references.
create trigger DeleteSelfRefs before delete on ValidPaths
begin
delete from Refs where referrer = old.id and reference = old.id;
end;
create table if not exists DerivationOutputs (
drv integer not null,
id text not null, -- symbolic output id, usually "out"
path text not null,
primary key (drv, id),
foreign key (drv) references ValidPaths(id) on delete cascade
);
create index if not exists IndexDerivationOutputs on DerivationOutputs(path);
create table if not exists FailedPaths (
path text primary key not null,
time integer not null
);
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