feat: mensajes

services/lms-service/migrations/20260127000001_course_announcements.sql

@@ -0,0 +1,33 @@
+-- Course Announcements System
+-- Allows instructors to post announcements to students with automatic notifications
+
+CREATE TABLE IF NOT EXISTS course_announcements (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
+    course_id UUID NOT NULL REFERENCES courses(id) ON DELETE CASCADE,
+    author_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    title TEXT NOT NULL,
+    content TEXT NOT NULL,
+    is_pinned BOOLEAN DEFAULT false,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Indexes for performance
+CREATE INDEX idx_announcements_course ON course_announcements(course_id);
+CREATE INDEX idx_announcements_org ON course_announcements(organization_id);
+CREATE INDEX idx_announcements_pinned ON course_announcements(is_pinned, created_at DESC);
+
+-- Trigger to update updated_at timestamp
+CREATE OR REPLACE FUNCTION update_announcement_timestamp()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER announcement_updated_at
+    BEFORE UPDATE ON course_announcements
+    FOR EACH ROW
+    EXECUTE FUNCTION update_announcement_timestamp();