chore: add migration for milestone strategy segments (#8593)

src/migrations/20241030093439-release-plans-template-ref-and-missing-strategy-fields.js

@@ -0,0 +1,27 @@
+exports.up = function(db, cb) {
+    db.runSql(`
+        ALTER TABLE release_plan_definitions ADD COLUMN release_plan_template_id TEXT REFERENCES release_plan_definitions(id) ON DELETE CASCADE;
+        CREATE INDEX idx_release_plan_template_definition_id ON release_plan_definitions (release_plan_template_id) WHERE release_plan_template_id IS NOT NULL;
+
+        ALTER TABLE feature_strategies ADD COLUMN milestone_id TEXT REFERENCES milestones(id) ON DELETE CASCADE;
+        CREATE INDEX idx_feature_strategies_milestone_id ON feature_strategies (milestone_id) WHERE milestone_id IS NOT NULL;
+
+        CREATE TABLE milestone_strategy_segments (
+            segment_id INT NOT NULL references segments(id) ON DELETE CASCADE,
+            milestone_strategy_id TEXT NOT NULL references milestone_strategies(id) ON DELETE CASCADE,
+            created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT (now() at time zone 'utc'),
+            PRIMARY KEY (segment_id, milestone_strategy_id)
+        );
+
+        ALTER TABLE milestone_strategies ADD COLUMN variants JSONB NOT NULL DEFAULT '[]'::JSONB;
+    `, cb)
+};
+
+exports.down = function(db, cb) {
+    db.runSql(`
+        ALTER TABLE release_plan_definitions DROP COLUMN release_plan_template_id;
+        ALTER TABLE feature_strategies DROP COLUMN milestone_id;
+        DROP TABLE milestone_strategy_segments;
+        ALTER TABLE milestone_strategies DROP COLUMN variants;
+    `, cb);
+};