updated db migration

database/migrations/20270101000073-create-media-playback-positions.js

@@ -0,0 +1,32 @@
+'use strict';
+
+// Raw SQL for the same CockroachDB DO-block/CREATE TYPE reason as
+// 20270101000067-create-completion-requirements.js.
+//
+// Decoupled from completion_requirements entirely — tracks last-known
+// playback position for ANY video/audio block, regardless of whether the
+// lesson has a watch-type completion requirement configured.
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.sequelize.query(`
+      CREATE TABLE media_playback_positions (
+        position_id  UUID         PRIMARY KEY,
+        user_id      BIGINT       NOT NULL REFERENCES users (user_id) ON DELETE CASCADE,
+        lesson_id    BIGINT       NOT NULL REFERENCES lessons (lesson_id) ON DELETE CASCADE,
+        block_id     STRING       NOT NULL,
+        percent      INTEGER      NOT NULL,
+        "createdAt"   TIMESTAMPTZ  NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        "updatedAt"   TIMESTAMPTZ  NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        CONSTRAINT uq_mpp_user_lesson_block UNIQUE (user_id, lesson_id, block_id)
+      );
+    `);
+
+    await queryInterface.sequelize.query(
+      `CREATE INDEX idx_mpp_user_lesson ON media_playback_positions (user_id, lesson_id);`
+    );
+  },
+
+  async down(queryInterface) {
+    await queryInterface.sequelize.query(`DROP TABLE IF EXISTS media_playback_positions;`);
+  },
+};