refactor: remove retired data format support

database/schema.sql

@@ -123,7 +123,7 @@ CREATE INDEX IF NOT EXISTS oversight_notification_queue_due_idx ON oversight_not
 CREATE INDEX IF NOT EXISTS oversight_notification_queue_user_category_idx ON oversight_notification_queue(user_id, oversight_category, delivered_at);
 CREATE INDEX IF NOT EXISTS avatar_reviews_status_submitted_idx ON avatar_reviews(status, submitted_at DESC);
 CREATE INDEX IF NOT EXISTS avatar_reviews_user_submitted_idx ON avatar_reviews(user_id, submitted_at DESC);
-  CREATE TABLE IF NOT EXISTS builds (id TEXT PRIMARY KEY, owner_id TEXT NOT NULL REFERENCES users(id), title TEXT NOT NULL, slug TEXT NOT NULL UNIQUE, visibility TEXT NOT NULL DEFAULT 'private', summary TEXT, guide_body TEXT, source_build_id TEXT REFERENCES builds(id), loadout_json TEXT, created_at TEXT NOT NULL, updated_at TEXT NOT NULL);
+  CREATE TABLE IF NOT EXISTS builds (id TEXT PRIMARY KEY, owner_id TEXT NOT NULL REFERENCES users(id), title TEXT NOT NULL, slug TEXT NOT NULL UNIQUE, visibility TEXT NOT NULL DEFAULT 'private', summary TEXT, guide_body TEXT, source_build_id TEXT REFERENCES builds(id), loadout_json TEXT NOT NULL, created_at TEXT NOT NULL, updated_at TEXT NOT NULL);
   CREATE INDEX IF NOT EXISTS builds_visibility_updated_idx ON builds(visibility, updated_at DESC);
 CREATE TABLE IF NOT EXISTS build_items (id TEXT PRIMARY KEY, build_id TEXT NOT NULL REFERENCES builds(id) ON DELETE CASCADE, slot_id TEXT NOT NULL, item_definition_id TEXT NOT NULL, configuration_json TEXT NOT NULL);
 CREATE TABLE IF NOT EXISTS ratings (user_id TEXT NOT NULL REFERENCES users(id), build_id TEXT NOT NULL REFERENCES builds(id) ON DELETE CASCADE, value INTEGER NOT NULL CHECK(value BETWEEN 1 AND 5), PRIMARY KEY(user_id, build_id));
@@ -621,7 +621,7 @@ CREATE TABLE IF NOT EXISTS os_protocol_talent_effects (
 CREATE TABLE IF NOT EXISTS skill_chip_sets (
 	id TEXT PRIMARY KEY,
 	name TEXT NOT NULL,
-	specialization_ability_id TEXT REFERENCES specialization_abilities(id),
+	specialization_ability_id TEXT NOT NULL REFERENCES specialization_abilities(id),
 	active INTEGER NOT NULL DEFAULT 1 CHECK(active IN (0, 1)),
 	created_at TEXT NOT NULL,
 	updated_at TEXT NOT NULL