PostgreSQL 데이터 계층 추가

db/migrations/001_initial_schema.sql

@@ -0,0 +1,47 @@
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE IF NOT EXISTS posts (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  title TEXT NOT NULL,
+  slug TEXT NOT NULL UNIQUE,
+  content TEXT NOT NULL DEFAULT '',
+  excerpt TEXT NOT NULL DEFAULT '',
+  featured_image TEXT,
+  status TEXT NOT NULL DEFAULT 'draft',
+  published_at TIMESTAMPTZ,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CONSTRAINT posts_status_check CHECK (status IN ('published', 'draft', 'private'))
+);
+
+CREATE INDEX IF NOT EXISTS posts_status_published_at_idx
+  ON posts (status, published_at DESC);
+
+CREATE TABLE IF NOT EXISTS pages (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  title TEXT NOT NULL,
+  slug TEXT NOT NULL UNIQUE,
+  content TEXT NOT NULL DEFAULT '',
+  featured_image TEXT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS tags (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  name TEXT NOT NULL,
+  slug TEXT NOT NULL UNIQUE,
+  description TEXT NOT NULL DEFAULT '',
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS post_tags (
+  post_id UUID NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
+  tag_id UUID NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  PRIMARY KEY (post_id, tag_id)
+);
+
+CREATE INDEX IF NOT EXISTS post_tags_tag_id_idx
+  ON post_tags (tag_id);