Add more detailed new revision job handling

Create a new events table for the new guix revision jobs, and update this when
processing a job starts, as well as finished with success or failure.

Additionally, remove the dependnency on open-inferior/container, as this
functionality isn't merged in to Guix master yet.

sqitch/deploy/load_new_guix_revision_job_events.sql

@@ -0,0 +1,18 @@
+-- Deploy guix-data-service:load_new_guix_revision_job_events to pg
+
+BEGIN;
+
+CREATE TYPE job_event AS ENUM ('start', 'failure', 'success');
+
+ALTER TABLE ONLY load_new_guix_revision_jobs
+    ADD CONSTRAINT load_new_guix_revision_jobs_id UNIQUE (id);
+
+CREATE TABLE load_new_guix_revision_job_events (
+    id integer GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    job_id integer NOT NULL,
+    event job_event NOT NULL,
+    occurred_at timestamp without time zone NOT NULL DEFAULT clock_timestamp(),
+    CONSTRAINT job_id FOREIGN KEY (job_id) REFERENCES load_new_guix_revision_jobs (id)
+);
+
+COMMIT;

sqitch/revert/load_new_guix_revision_job_events.sql

@@ -0,0 +1,12 @@
+-- Revert guix-data-service:load_new_guix_revision_job_events from pg
+
+BEGIN;
+
+DROP TABLE load_new_guix_revision_job_events;
+
+ALTER TABLE load_new_guix_revision_jobs
+  DROP CONSTRAINT load_new_guix_revision_jobs_id;
+
+DROP TYPE IF EXISTS job_event;
+
+COMMIT;

sqitch/sqitch.plan

@@ -12,3 +12,4 @@ add_location_information 2019-05-12T20:27:48Z Christopher Baines <mail@cbaines.n
 add_git_repositories_cgit_url_base 2019-05-13T18:45:14Z Christopher Baines <mail@cbaines.net> # Add cgit_url_base to git_repositories
 license_support 2019-05-13T20:37:40Z Christopher Baines <mail@cbaines.net> # Add support for storing license information
 dates_to_load_new_guix_revision_jobs 2019-06-02T07:39:49Z Christopher Baines <mail@cbaines.net> # Add dates to the load_new_guix_revision_jobs table
+load_new_guix_revision_job_events 2019-06-02T15:44:41Z Christopher Baines <mail@cbaines.net> # Add new table for guix_revision_job_events

sqitch/verify/load_new_guix_revision_job_events.sql

@@ -0,0 +1,8 @@
+-- Verify guix-data-service:load_new_guix_revision_job_events on pg
+
+BEGIN;
+
+SELECT id, job_id, event, occurred_at
+  FROM load_new_guix_revision_job_events WHERE FALSE;
+
+ROLLBACK;