feat(faq): implement FAQ moderation workflow with import, review, and publish functionalities

services/lms-service/migrations/20260410000001_faq_review_queue.sql

@@ -0,0 +1,44 @@
+-- FAQ moderation workflow based on student AI chats
+
+CREATE TABLE IF NOT EXISTS faq_entries (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL,
+    question TEXT NOT NULL,
+    answer TEXT NOT NULL,
+    tags TEXT[] DEFAULT '{}',
+    source VARCHAR(50) NOT NULL DEFAULT 'human-reviewed',
+    created_by UUID,
+    is_published BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_faq_entries_org_published
+    ON faq_entries (organization_id, is_published, created_at DESC);
+
+CREATE TABLE IF NOT EXISTS faq_review_queue (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL,
+    source_ai_usage_log_id UUID UNIQUE,
+    user_id UUID NOT NULL,
+    lesson_id UUID,
+    session_id UUID,
+    question_text TEXT NOT NULL,
+    ai_response TEXT,
+    rag_context_found BOOLEAN NOT NULL DEFAULT FALSE,
+    status VARCHAR(20) NOT NULL DEFAULT 'pending',
+    reviewer_id UUID,
+    reviewer_note TEXT,
+    human_answer TEXT,
+    faq_entry_id UUID,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    reviewed_at TIMESTAMPTZ,
+    CONSTRAINT chk_faq_review_status CHECK (status IN ('pending', 'answered', 'published', 'dismissed')),
+    CONSTRAINT fk_faq_review_faq_entry FOREIGN KEY (faq_entry_id) REFERENCES faq_entries(id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_faq_review_org_status
+    ON faq_review_queue (organization_id, status, created_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_faq_review_source_log
+    ON faq_review_queue (source_ai_usage_log_id);