feat: Implement LTI deep linking, live sessions, predictive analytics, and portfolios with associated UI and database migrations.

services/lms-service/migrations/20260218000002_lesson_dependencies_mirror.sql

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+CREATE TABLE lesson_dependencies (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
+    lesson_id UUID NOT NULL REFERENCES lessons(id) ON DELETE CASCADE,
+    prerequisite_lesson_id UUID NOT NULL REFERENCES lessons(id) ON DELETE CASCADE,
+    min_score_percentage DOUBLE PRECISION,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(lesson_id, prerequisite_lesson_id),
+    CHECK (lesson_id != prerequisite_lesson_id)
+);
+
+CREATE INDEX idx_lesson_dependencies_lesson_id ON lesson_dependencies(lesson_id);
+CREATE INDEX idx_lesson_dependencies_prerequisite_id ON lesson_dependencies(prerequisite_lesson_id);
+CREATE INDEX idx_lesson_dependencies_org_id ON lesson_dependencies(organization_id);

services/lms-service/migrations/20260226000000_lti_dl_requests.sql

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+-- Migration: Add LTI Deep Linking support tables
+
+CREATE TABLE IF NOT EXISTS lti_deep_linking_requests (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    registration_id UUID NOT NULL REFERENCES lti_registrations(id),
+    deployment_id TEXT NOT NULL,
+    return_url TEXT NOT NULL,
+    data TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Index for cleanup
+CREATE INDEX idx_lti_dl_requests_created_at ON lti_deep_linking_requests(created_at);

services/lms-service/migrations/20260226010000_dropout_risks.sql

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+CREATE OR REPLACE FUNCTION update_updated_at_column()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+CREATE TYPE dropout_risk_level AS ENUM ('low', 'medium', 'high', 'critical');
+
+CREATE TABLE IF NOT EXISTS dropout_risks (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id),
+    course_id UUID NOT NULL REFERENCES courses(id),
+    user_id UUID NOT NULL REFERENCES users(id),
+    risk_level dropout_risk_level NOT NULL DEFAULT 'low',
+    score REAL NOT NULL DEFAULT 0.0,
+    reasons JSONB,
+    last_calculated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(course_id, user_id)
+);
+
+-- Trigger for updated_at
+CREATE TRIGGER update_dropout_risks_updated_at
+BEFORE UPDATE ON dropout_risks
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();

services/lms-service/migrations/20260226020000_live_learning.sql

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+CREATE TABLE meetings (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id),
+    course_id UUID NOT NULL REFERENCES courses(id),
+    title TEXT NOT NULL,
+    description TEXT,
+    provider TEXT NOT NULL DEFAULT 'jitsi',
+    meeting_id TEXT NOT NULL,
+    start_at TIMESTAMPTZ NOT NULL,
+    duration_minutes INTEGER NOT NULL,
+    join_url TEXT,
+    is_active BOOLEAN NOT NULL DEFAULT true,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Index for quick lookup of course meetings
+CREATE INDEX idx_meetings_course ON meetings(course_id);
+
+-- Trigger for updated_at
+CREATE TRIGGER update_meetings_updated_at
+BEFORE UPDATE ON meetings
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_at_column();

services/lms-service/migrations/20260226030000_portfolios.sql

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+-- Migration: Portfolios & Badges (Adjustments)
+-- This migration adjusts existing gamification tables to support the new features
+
+-- 1. Adjust badges table
+ALTER TABLE badges ADD COLUMN IF NOT EXISTS criteria JSONB NOT NULL DEFAULT '{}';
+-- Ensure organization_id has a foreign key if it's missing (optional but good)
+DO $$ 
+BEGIN 
+    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'badges_organization_id_fkey') THEN
+        ALTER TABLE badges ADD CONSTRAINT badges_organization_id_fkey FOREIGN KEY (organization_id) REFERENCES organizations(id);
+    END IF;
+END $$;
+
+-- 2. Adjust user_badges table
+ALTER TABLE user_badges ADD COLUMN IF NOT EXISTS evidence_url TEXT;
+-- Rename earned_at to awarded_at if needed, or just use earned_at in code.
+-- The model currently expects awarded_at. Let's rename if exists.
+DO $$ 
+BEGIN 
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name='user_badges' AND column_name='earned_at') THEN
+        ALTER TABLE user_badges RENAME COLUMN earned_at TO awarded_at;
+    END IF;
+END $$;
+
+-- 3. Add profile visibility to users
+ALTER TABLE users ADD COLUMN IF NOT EXISTS is_public_profile BOOLEAN DEFAULT true;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS linkedin_url TEXT;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS github_url TEXT;
+
+-- 4. Seed some extra default badges if not present
+INSERT INTO badges (organization_id, name, description, icon_url, requirement_type, requirement_value)
+SELECT id, 'Open Source Contributor', 'Linked a GitHub account to your profile', '/badges/github.svg', 'points', 0
+FROM organizations 
+WHERE NOT EXISTS (SELECT 1 FROM badges WHERE name = 'Open Source Contributor')
+LIMIT 1;
+
+INSERT INTO badges (organization_id, name, description, icon_url, requirement_type, requirement_value)
+SELECT id, 'Networking Pro', 'Linked a LinkedIn account to your profile', '/badges/linkedin.svg', 'points', 0
+FROM organizations 
+WHERE NOT EXISTS (SELECT 1 FROM badges WHERE name = 'Networking Pro')
+LIMIT 1;