-- 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);