* artifact update

manifest

@@ -44,3 +44,4 @@ admin_users.sql
 full_text_search.sql
 saved_tracks.sql
 saved_tracks_upload_id.sql
+artifact_update.sql

up/artifact_update.sql

@@ -0,0 +1,14 @@
+-- artifact 'pointer' table
+
+CREATE TABLE artifact_updates (
+    id character varying(64) NOT NULL DEFAULT uuid_generate_v4(),
+    product varchar(255) NOT NULL,
+    version varchar(255) NOT NULL,
+    uri varchar(2000) NOT NULL,
+    sha1 varchar(255) NOT NULL,
+    environment varchar(255) NOT NULL DEFAULT 'public'
+);
+
+ALTER TABLE artifact_updates ADD CONSTRAINT artifact_updates_uniqkey UNIQUE (product, version);
+
+ALTER TABLE users ADD COLUMN environment varchar(255) NOT NULL DEFAULT 'public';