Define DB schema for bundles and subscriptions (#2670)

Relates to #2543

Define the subscriptions and bundles table. Add a foreign key reference
to subscriptions in both the profiles and rule type tables.

database/migrations/000029_bundle_subscription.down.sql

@@ -0,0 +1,19 @@
+-- Copyright 2024 Stacklok, Inc
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--      http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+ALTER TABLE projects DROP COLUMN subscription_id;
+ALTER TABLE rule_type DROP COLUMN subscription_id;
+
+DROP TABLE IF EXISTS subscriptions;
+DROP TABLE IF EXISTS bundles;

database/migrations/000029_bundle_subscription.up.sql

@@ -0,0 +1,43 @@
+-- Copyright 2024 Stacklok, Inc
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--      http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+CREATE TABLE bundles(
+    -- I have given this a separate PK to simplify some of the queries
+    -- the combination of the remaining columns are unique
+    id          UUID NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+    namespace   TEXT NOT NULL,
+    name        TEXT NOT NULL,
+    UNIQUE      (namespace, name)
+);
+
+CREATE TABLE subscriptions(
+    -- same comment as for PK of `bundles`
+    id                UUID NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+    project_id        UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
+    -- this FK is not ON DELETE CASCADE
+    -- this prevents deletion of bundles which are still in use
+    bundle_id         UUID NOT NULL REFERENCES bundles(id),
+    current_version    TEXT NOT NULL,
+    UNIQUE (bundle_id, project_id)
+);
+
+-- none of these FKs are ON DELETE CASCADE
+-- prevents deletion of an in-use subscription
+ALTER TABLE projects
+    ADD COLUMN subscription_id UUID DEFAULT NULL
+    REFERENCES subscriptions(id);
+
+ALTER TABLE rule_type
+    ADD COLUMN subscription_id UUID DEFAULT NULL
+    REFERENCES subscriptions(id);