feat(db): Bun.SQL connection and portable migrations

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/db/migrations/0001_init.sql

@@ -0,0 +1,68 @@
+-- Portable SQL: TEXT ids and ISO-8601 timestamps, INTEGER booleans, TEXT JSON.
+CREATE TABLE user_roles (
+  user_id TEXT NOT NULL, role TEXT NOT NULL,
+  PRIMARY KEY (user_id, role)
+);
+CREATE TABLE groups (id TEXT PRIMARY KEY, name TEXT NOT NULL UNIQUE);
+CREATE TABLE group_members (
+  group_id TEXT NOT NULL, user_id TEXT NOT NULL,
+  PRIMARY KEY (group_id, user_id)
+);
+CREATE TABLE course_authors (
+  course_id TEXT NOT NULL, user_id TEXT NOT NULL,
+  PRIMARY KEY (course_id, user_id)
+);
+CREATE TABLE course_acl (
+  course_id TEXT NOT NULL,
+  principal_type TEXT NOT NULL CHECK (principal_type IN ('user', 'group')),
+  principal_id TEXT NOT NULL,
+  PRIMARY KEY (course_id, principal_type, principal_id)
+);
+CREATE TABLE progress (
+  user_id TEXT NOT NULL, course_id TEXT NOT NULL, lesson_id TEXT NOT NULL,
+  state TEXT NOT NULL CHECK (state IN ('not-started', 'in-progress', 'done')),
+  position_seconds REAL,
+  updated_at TEXT NOT NULL,
+  PRIMARY KEY (user_id, course_id, lesson_id)
+);
+CREATE TABLE notes (
+  id TEXT PRIMARY KEY, user_id TEXT NOT NULL, course_id TEXT NOT NULL, lesson_id TEXT NOT NULL,
+  anchor_kind TEXT NOT NULL CHECK (anchor_kind IN ('none', 'video', 'slide')),
+  anchor_value TEXT, deck_id TEXT,
+  body TEXT NOT NULL, created_at TEXT NOT NULL, updated_at TEXT NOT NULL
+);
+CREATE INDEX notes_by_lesson ON notes (user_id, course_id, lesson_id);
+CREATE TABLE exercise_attempts (
+  user_id TEXT NOT NULL, course_id TEXT NOT NULL, lesson_id TEXT NOT NULL, track TEXT NOT NULL,
+  code TEXT NOT NULL, result_json TEXT, passed INTEGER NOT NULL, updated_at TEXT NOT NULL,
+  PRIMARY KEY (user_id, course_id, lesson_id, track)
+);
+CREATE TABLE user_api_keys (
+  user_id TEXT NOT NULL, provider TEXT NOT NULL, ciphertext TEXT NOT NULL, created_at TEXT NOT NULL,
+  PRIMARY KEY (user_id, provider)
+);
+CREATE TABLE ai_settings (
+  scope TEXT NOT NULL CHECK (scope IN ('server', 'user')),
+  owner_id TEXT NOT NULL, -- '' for server scope
+  mentor_off INTEGER NOT NULL, config_json TEXT NOT NULL, updated_at TEXT NOT NULL,
+  PRIMARY KEY (scope, owner_id)
+);
+CREATE TABLE ai_conversations (
+  id TEXT PRIMARY KEY, user_id TEXT NOT NULL, course_id TEXT NOT NULL, title TEXT, created_at TEXT NOT NULL
+);
+CREATE TABLE ai_messages (
+  id TEXT PRIMARY KEY, conversation_id TEXT NOT NULL, role TEXT NOT NULL, content TEXT NOT NULL, created_at TEXT NOT NULL
+);
+CREATE INDEX ai_messages_by_conversation ON ai_messages (conversation_id);
+CREATE TABLE library_settings (key TEXT PRIMARY KEY, value TEXT NOT NULL);
+CREATE TABLE collections (id TEXT PRIMARY KEY, title TEXT NOT NULL, sort INTEGER NOT NULL);
+CREATE TABLE collection_courses (
+  collection_id TEXT NOT NULL, course_id TEXT NOT NULL, sort INTEGER NOT NULL,
+  PRIMARY KEY (collection_id, course_id)
+);
+CREATE TABLE jobs (
+  id TEXT PRIMARY KEY, kind TEXT NOT NULL, status TEXT NOT NULL, progress REAL NOT NULL,
+  message TEXT, payload_json TEXT NOT NULL, result_json TEXT, error TEXT,
+  created_at TEXT NOT NULL, updated_at TEXT NOT NULL
+);
+CREATE INDEX jobs_by_status ON jobs (status);