* Convert the Nix database to SQLite.

src/libstore/schema.sql

@@ -0,0 +1,27 @@
+pragma foreign_keys = on;
+
+create table if not exists ValidPaths (
+    path             text primary key not null,
+    hash             text not null,
+    registrationTime integer not null
+);
+
+create table if not exists Refs (
+    referrer  text not null,
+    reference text not null,
+    primary key (referrer, reference),
+    foreign key (referrer) references ValidPaths(path)
+      on delete cascade
+      deferrable initially deferred,
+    foreign key (reference) references ValidPaths(path)
+      on delete restrict
+      deferrable initially deferred
+);
+
+create table if not exists FailedDerivations (
+    path text primary key not null,
+    time integer not null
+);
+
+create index IndexReferrer on Refs(referrer);
+create index IndexReference on Refs(reference);