fix(pseo): error details collapse + UNIQUE constraint on slug

1. Stop HTMX polling on job rows that have an error set, so the
   <details> element stays open when clicked (was being replaced
   every 2s by the poll cycle).

2. Migration 0030: drop redundant single-column UNIQUE on
   articles.slug — the real uniqueness key is (url_path, language).
   The slug index is kept for lookups.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/padelnomics/admin/templates/admin/pseo_job_status.html

@@ -5,7 +5,7 @@
 {% set pct = [((job.progress_current / job.progress_total) * 100) | int, 100] | min if job.progress_total else 0 %}
 
 <tr id="job-{{ job.id }}"
-    {% if job.status == 'pending' %}
+    {% if job.status == 'pending' and not job.error %}
     hx-get="{{ url_for('pseo.pseo_job_status', job_id=job.id) }}"
     hx-trigger="every 2s"
     hx-target="this"

web/src/padelnomics/migrations/versions/0030_drop_slug_unique.py

@@ -0,0 +1,93 @@
+"""Drop UNIQUE constraint from articles.slug column.
+
+The single-column UNIQUE on slug conflicts with the ON CONFLICT(url_path, language)
+upsert in pSEO generation, causing 'UNIQUE constraint failed: articles.slug' errors
+when re-running generation for the same template.
+
+The slug is already unique by construction ({template_slug}-{lang}-{natural_key}),
+and the real uniqueness key is (url_path, language). The idx_articles_slug index
+is kept for fast lookups.
+"""
+
+
+def up(conn) -> None:
+    # ── 1. Drop FTS triggers + virtual table ──────────────────────────────────
+    conn.execute("DROP TRIGGER IF EXISTS articles_ai")
+    conn.execute("DROP TRIGGER IF EXISTS articles_ad")
+    conn.execute("DROP TRIGGER IF EXISTS articles_au")
+    conn.execute("DROP TABLE IF EXISTS articles_fts")
+
+    # ── 2. Recreate articles without UNIQUE on slug ───────────────────────────
+    conn.execute("""
+        CREATE TABLE articles_new (
+            id               INTEGER PRIMARY KEY AUTOINCREMENT,
+            url_path         TEXT NOT NULL,
+            slug             TEXT NOT NULL,
+            title            TEXT NOT NULL,
+            meta_description TEXT,
+            country          TEXT,
+            region           TEXT,
+            og_image_url     TEXT,
+            status           TEXT NOT NULL DEFAULT 'draft',
+            published_at     TEXT,
+            template_slug    TEXT,
+            language         TEXT NOT NULL DEFAULT 'en',
+            date_modified    TEXT,
+            seo_head         TEXT,
+            created_at       TEXT NOT NULL DEFAULT (datetime('now')),
+            updated_at       TEXT,
+            group_key        TEXT DEFAULT NULL,
+            noindex          INTEGER NOT NULL DEFAULT 0,
+            article_type     TEXT NOT NULL DEFAULT 'editorial',
+            UNIQUE(url_path, language)
+        )
+    """)
+    conn.execute("""
+        INSERT INTO articles_new
+            (id, url_path, slug, title, meta_description, country, region,
+             og_image_url, status, published_at, template_slug, language,
+             date_modified, seo_head, created_at, updated_at, group_key,
+             noindex, article_type)
+        SELECT id, url_path, slug, title, meta_description, country, region,
+               og_image_url, status, published_at, template_slug, language,
+               date_modified, seo_head, created_at, updated_at, group_key,
+               noindex, article_type
+        FROM articles
+    """)
+    conn.execute("DROP TABLE articles")
+    conn.execute("ALTER TABLE articles_new RENAME TO articles")
+
+    # ── 3. Recreate indexes ───────────────────────────────────────────────────
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_articles_url_path ON articles(url_path)")
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_articles_url_lang ON articles(url_path, language)")
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_articles_slug ON articles(slug)")
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_articles_status ON articles(status, published_at)")
+    conn.execute("CREATE INDEX IF NOT EXISTS idx_articles_article_type ON articles(article_type)")
+
+    # ── 4. Recreate FTS + triggers ────────────────────────────────────────────
+    conn.execute("""
+        CREATE VIRTUAL TABLE IF NOT EXISTS articles_fts USING fts5(
+            title, meta_description, country, region,
+            content='articles', content_rowid='id'
+        )
+    """)
+    conn.execute("""
+        CREATE TRIGGER IF NOT EXISTS articles_ai AFTER INSERT ON articles BEGIN
+            INSERT INTO articles_fts(rowid, title, meta_description, country, region)
+            VALUES (new.id, new.title, new.meta_description, new.country, new.region);
+        END
+    """)
+    conn.execute("""
+        CREATE TRIGGER IF NOT EXISTS articles_ad AFTER DELETE ON articles BEGIN
+            INSERT INTO articles_fts(articles_fts, rowid, title, meta_description, country, region)
+            VALUES ('delete', old.id, old.title, old.meta_description, old.country, old.region);
+        END
+    """)
+    conn.execute("""
+        CREATE TRIGGER IF NOT EXISTS articles_au AFTER UPDATE ON articles BEGIN
+            INSERT INTO articles_fts(articles_fts, rowid, title, meta_description, country, region)
+            VALUES ('delete', old.id, old.title, old.meta_description, old.country, old.region);
+            INSERT INTO articles_fts(rowid, title, meta_description, country, region)
+            VALUES (new.id, new.title, new.meta_description, new.country, new.region);
+        END
+    """)