feat: series API — тематические подборки статей

- БД: таблица series (slug, title, intro, icon, color, article_ids JSONB, is_featured, sort_order)
- routes/series.js: CRUD серий, GET /:slug возвращает серию вместе со статьями (через JOIN по array_position для сохранения порядка)
- Индекс idx_series_slug

src/config/db.js

@@ -157,6 +157,23 @@ const migrate = async () => {
     );
   `);
 
+  // series — тематические серии статей
+  await query(`
+    CREATE TABLE IF NOT EXISTS series (
+      id          SERIAL PRIMARY KEY,
+      slug        VARCHAR(120) UNIQUE NOT NULL,
+      title       VARCHAR(255) NOT NULL,
+      intro       TEXT,
+      icon        VARCHAR(40),
+      color       VARCHAR(20) DEFAULT 'emerald',
+      article_ids JSONB DEFAULT '[]'::jsonb,
+      is_featured BOOLEAN DEFAULT false,
+      sort_order  INTEGER DEFAULT 0,
+      created_at  TIMESTAMPTZ DEFAULT NOW(),
+      updated_at  TIMESTAMPTZ DEFAULT NOW()
+    );
+  `);
+
   // индексы
   await query(`
     CREATE INDEX IF NOT EXISTS idx_channels_user ON channels(user_id);
@@ -167,6 +184,7 @@ const migrate = async () => {
     CREATE INDEX IF NOT EXISTS idx_articles_slug ON articles(slug);
     CREATE INDEX IF NOT EXISTS idx_articles_status_pub ON articles(status, published_at DESC);
     CREATE INDEX IF NOT EXISTS idx_notes_pub ON editor_notes(is_published, created_at DESC);
+    CREATE INDEX IF NOT EXISTS idx_series_slug ON series(slug);
   `);
 
   console.log('[DB] Migrations applied');

src/routes/series.js

@@ -0,0 +1,98 @@
+const express = require('express');
+const router = express.Router();
+const { query } = require('../config/db');
+
+// GET /api/series — список серий
+router.get('/', async (req, res) => {
+  try {
+    const { rows } = await query(
+      `SELECT s.*,
+        (SELECT COUNT(*) FROM articles a
+         WHERE a.id::text = ANY(SELECT jsonb_array_elements_text(s.article_ids))
+           AND a.status='published') as articles_count
+       FROM series s ORDER BY sort_order ASC, created_at ASC`
+    );
+    res.json(rows);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// GET /api/series/:slug — серия со статьями
+router.get('/:slug', async (req, res) => {
+  try {
+    const { rows: sRows } = await query(`SELECT * FROM series WHERE slug=$1`, [req.params.slug]);
+    if (!sRows.length) return res.status(404).json({ error: 'Not found' });
+    const series = sRows[0];
+
+    const ids = (series.article_ids || []).map(Number).filter(Boolean);
+    let articles = [];
+    if (ids.length) {
+      const { rows: aRows } = await query(
+        `SELECT id, slug, title, excerpt, cover_url, tags, reading_time, published_at
+         FROM articles WHERE id = ANY($1::int[]) AND status='published'
+         ORDER BY array_position($1::int[], id) ASC`,
+        [ids]
+      );
+      articles = aRows;
+    }
+    res.json({ ...series, articles });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// POST /api/series — создать
+router.post('/', async (req, res) => {
+  try {
+    const { slug, title, intro, icon, color, article_ids = [], is_featured, sort_order } = req.body;
+    if (!slug || !title) return res.status(400).json({ error: 'slug and title required' });
+    const { rows } = await query(
+      `INSERT INTO series (slug, title, intro, icon, color, article_ids, is_featured, sort_order)
+       VALUES ($1,$2,$3,$4,$5,$6,$7,$8) RETURNING *`,
+      [slug, title, intro || null, icon || null, color || 'emerald',
+       JSON.stringify(article_ids), !!is_featured, sort_order || 0]
+    );
+    res.json(rows[0]);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// PATCH /api/series/:id
+router.patch('/:id', async (req, res) => {
+  try {
+    const { title, intro, icon, color, article_ids, is_featured, sort_order } = req.body;
+    const { rows } = await query(
+      `UPDATE series SET
+        title=COALESCE($1,title),
+        intro=COALESCE($2,intro),
+        icon=COALESCE($3,icon),
+        color=COALESCE($4,color),
+        article_ids=COALESCE($5::jsonb,article_ids),
+        is_featured=COALESCE($6,is_featured),
+        sort_order=COALESCE($7,sort_order),
+        updated_at=NOW()
+       WHERE id=$8 RETURNING *`,
+      [title, intro, icon, color,
+       article_ids !== undefined ? JSON.stringify(article_ids) : null,
+       is_featured, sort_order, req.params.id]
+    );
+    if (!rows.length) return res.status(404).json({ error: 'Not found' });
+    res.json(rows[0]);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// DELETE /api/series/:id
+router.delete('/:id', async (req, res) => {
+  try {
+    await query(`DELETE FROM series WHERE id=$1`, [req.params.id]);
+    res.json({ ok: true });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+module.exports = router;