Add new derivation_output_details_set_id column to the builds table

As this will hopefully provide a faster way of associating derivations with
builds.

sqitch/deploy/builds_add_derivation_output_details_set_id.sql

@@ -0,0 +1,22 @@
+-- Deploy guix-data-service:builds_add_derivation_output_details_set_id to pg
+
+BEGIN;
+
+ALTER TABLE builds
+  ADD COLUMN derivation_output_details_set_id integer
+  NULL
+  DEFAULT NULL
+  REFERENCES derivation_output_details_sets (id);
+
+UPDATE builds SET derivation_output_details_set_id = (
+  SELECT derivations_by_output_details_set.derivation_output_details_set_id
+  FROM derivations_by_output_details_set
+  INNER JOIN derivations
+    ON derivations.file_name = builds.derivation_file_name
+  WHERE derivations_by_output_details_set.derivation_id = derivations.id
+);
+
+CREATE INDEX builds_derivation_output_details_set_id ON
+  builds (derivation_output_details_set_id);
+
+COMMIT;

sqitch/revert/builds_add_derivation_output_details_set_id.sql

@@ -0,0 +1,7 @@
+-- Revert guix-data-service:builds_add_derivation_output_details_set_id from pg
+
+BEGIN;
+
+-- XXX Add DDLs here.
+
+COMMIT;

sqitch/sqitch.plan

@@ -37,3 +37,4 @@ change_nar_urls_size_to_bigint 2019-12-04T21:49:07Z   <chris@phact> # Change nar
 sort_out_duplicate_builds 2019-12-05T12:43:53Z   <chris@phact> # Sort out duplicate builds
 add_some_database_indexes 2019-12-05T15:53:04Z Christopher Baines <mail@cbaines.net> # Add some indexes
 derivation_output_sets 2019-12-05T23:19:05Z Christopher Baines <mail@cbaines.net> # Describe the sets of derivation outputs
+builds_add_derivation_output_details_set_id 2019-12-07T18:25:38Z Christopher Baines <mail@cbaines.net> # Add a derivation_output_details_set_id column to builds

sqitch/verify/builds_add_derivation_output_details_set_id.sql

@@ -0,0 +1,7 @@
+-- Verify guix-data-service:builds_add_derivation_output_details_set_id on pg
+
+BEGIN;
+
+-- XXX Add verifications here.
+
+ROLLBACK;