feat: Add LTI launch, lesson preview, course progress, bookmarks, and asset management features.

services/lms-service/migrations/20260223000000_add_preview_and_teams.sql

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+-- Migration to support course previews and multi-instructor sync
+ALTER TABLE lessons ADD COLUMN is_previewable BOOLEAN NOT NULL DEFAULT FALSE;
+
+CREATE TABLE course_instructors (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    course_id UUID NOT NULL REFERENCES courses(id) ON DELETE CASCADE,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    role TEXT NOT NULL DEFAULT 'instructor',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(course_id, user_id)
+);

services/lms-service/migrations/20260224000000_add_bookmarks.sql

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+-- Create user_bookmarks table for students to save lessons
+CREATE TABLE IF NOT EXISTS user_bookmarks (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL,
+    user_id UUID NOT NULL,
+    course_id UUID NOT NULL,
+    lesson_id UUID NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    UNIQUE(user_id, lesson_id)
+);
+
+-- Index for efficient querying
+CREATE INDEX IF NOT EXISTS idx_user_bookmarks_user_id ON user_bookmarks(user_id);
+CREATE INDEX IF NOT EXISTS idx_user_bookmarks_course_id ON user_bookmarks(course_id);
+CREATE INDEX IF NOT EXISTS idx_user_bookmarks_org_id ON user_bookmarks(organization_id);

services/lms-service/migrations/20260225000000_lti_tables.sql

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+-- Migration: Add LTI 1.3 tables
+
+CREATE TABLE IF NOT EXISTS lti_registrations (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id),
+    issuer TEXT NOT NULL,
+    client_id TEXT NOT NULL,
+    deployment_id TEXT NOT NULL,
+    auth_token_url TEXT NOT NULL,
+    auth_login_url TEXT NOT NULL,
+    jwks_url TEXT NOT NULL,
+    platform_name TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(issuer, client_id, deployment_id)
+);
+
+CREATE TABLE IF NOT EXISTS lti_nonces (
+    nonce TEXT PRIMARY KEY,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Delete nonces older than 1 hour (can be run via cron or during launch)
+-- DELETE FROM lti_nonces WHERE created_at < NOW() - INTERVAL '1 hour';
+
+CREATE TABLE IF NOT EXISTS lti_resource_links (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id),
+    resource_link_id TEXT NOT NULL,
+    course_id UUID NOT NULL REFERENCES courses(id),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(organization_id, resource_link_id)
+);
+
+CREATE INDEX idx_lti_registrations_issuer_client ON lti_registrations(issuer, client_id);