feat: Add i18n support, new content block types, course export, and lesson interaction tracking.

services/lms-service/migrations/20260117000200_add_lesson_interactions.sql

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+-- Create lesson_interactions table for engagement tracking
+CREATE TABLE IF NOT EXISTS lesson_interactions (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL,
+    user_id UUID NOT NULL,
+    lesson_id UUID NOT NULL,
+    video_timestamp FLOAT, -- Timestamp in seconds for video content
+    event_type VARCHAR(50) NOT NULL, -- 'heartbeat', 'pause', 'seek', 'complete', 'start'
+    metadata JSONB, -- Additional data (segment duration, playback speed, etc.)
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Index for efficient querying of heatmaps
+CREATE INDEX IF NOT EXISTS idx_lesson_interactions_lesson_id ON lesson_interactions(lesson_id);
+CREATE INDEX IF NOT EXISTS idx_lesson_interactions_user_id ON lesson_interactions(user_id);
+CREATE INDEX IF NOT EXISTS idx_lesson_interactions_org_id ON lesson_interactions(organization_id);

services/lms-service/migrations/20260117000300_add_notifications.sql

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+-- Create notifications table for in-app alerts
+CREATE TABLE IF NOT EXISTS notifications (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL,
+    user_id UUID NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    message TEXT NOT NULL,
+    notification_type VARCHAR(50) DEFAULT 'info', -- 'info', 'warning', 'success', 'deadline'
+    is_read BOOLEAN DEFAULT FALSE,
+    link_url VARCHAR(255), -- Optional link to redirect the user
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_notifications_user_id ON notifications(user_id);
+CREATE INDEX IF NOT EXISTS idx_notifications_org_id ON notifications(organization_id);
+CREATE INDEX IF NOT EXISTS idx_notifications_unread ON notifications(user_id) WHERE is_read = FALSE;