Phase 6: Verwendungs-Sicht pro Grundquelle

Backend
- /api/sources/global liefert pro Quelle articles_7d, articles_30d und
  tenant_excluded_count (eine aggregierte Query mit CTEs, kein N+1).
- Match-Logik fuer Articles: LOWER(articles.source) = LOWER(sources.name)
  - articles.source_url ist Artikel-URL, NICHT Feed-URL, daher matcht das
    nicht mit sources.url. source-Name-Match liefert sinnvolle Treffer.
- tenant_excluded_count zaehlt distinct organization_ids aus
  user_excluded_domains (per LOWER(domain)-Match).

Frontend
- dashboard.html: zwei neue sortierbare Spalten Aktivitaet (7d/30d) +
  Sperren in der Grundquellen-Tabelle.
- style.css: .activity-cell + .exclude-badge Styles (mit zero-Variante
  fuer ruhigen Look bei keiner Aktivitaet/Sperre).
- sources.js:
  - cols 9 -> 11
  - Render: 7d-Wert fett, 30d-Wert dezent, Tooltip 7 Tage / 30 Tage
  - Sort-Logik: NUMERIC_FIELDS um articles_7d/articles_30d/tenant_excluded_count
    erweitert (numerischer Compare statt localeCompare)

src/routers/sources.py

@@ -72,26 +72,48 @@ async def list_global_sources(
     pro Zeile zeigen, ohne separate Health-Tab-Abfrage.
     """
     cursor = await db.execute("""
+        WITH article_stats AS (
+            -- Match per source-Name (case-insensitive). source_url im articles ist die
+            -- Artikel-URL, nicht die Feed-URL - daher matcht das nicht mit sources.url.
+            SELECT LOWER(source) AS s_lower,
+                   SUM(CASE WHEN collected_at > datetime('now', '-7 days')  THEN 1 ELSE 0 END) AS a7d,
+                   SUM(CASE WHEN collected_at > datetime('now', '-30 days') THEN 1 ELSE 0 END) AS a30d
+            FROM articles
+            WHERE collected_at > datetime('now', '-30 days')
+              AND source IS NOT NULL
+            GROUP BY LOWER(source)
+        ),
+        excluded_counts AS (
+            SELECT LOWER(ued.domain) AS dom,
+                   COUNT(DISTINCT u.organization_id) AS cnt
+            FROM user_excluded_domains ued
+            JOIN users u ON u.id = ued.user_id
+            WHERE ued.domain IS NOT NULL
+            GROUP BY LOWER(ued.domain)
+        ),
+        health_agg AS (
+            SELECT source_id,
+                   MAX(CASE WHEN status = 'error' THEN 3
+                            WHEN status = 'warning' THEN 2
+                            WHEN status = 'ok' THEN 1
+                            ELSE 0 END) AS rank
+            FROM source_health_checks
+            GROUP BY source_id
+        )
         SELECT s.*,
-               COALESCE((
-                 SELECT CASE
-                     WHEN MAX(CASE WHEN h.status = 'error' THEN 3
-                                   WHEN h.status = 'warning' THEN 2
-                                   WHEN h.status = 'ok' THEN 1
-                                   ELSE 0 END) = 3 THEN 'error'
-                     WHEN MAX(CASE WHEN h.status = 'error' THEN 3
-                                   WHEN h.status = 'warning' THEN 2
-                                   WHEN h.status = 'ok' THEN 1
-                                   ELSE 0 END) = 2 THEN 'warning'
-                     WHEN MAX(CASE WHEN h.status = 'error' THEN 3
-                                   WHEN h.status = 'warning' THEN 2
-                                   WHEN h.status = 'ok' THEN 1
-                                   ELSE 0 END) = 1 THEN 'ok'
-                     ELSE NULL
-                 END
-                 FROM source_health_checks h WHERE h.source_id = s.id
-               ), NULL) AS health_status
+               CASE ha.rank
+                   WHEN 3 THEN 'error'
+                   WHEN 2 THEN 'warning'
+                   WHEN 1 THEN 'ok'
+                   ELSE NULL
+               END AS health_status,
+               COALESCE(ast.a7d,  0) AS articles_7d,
+               COALESCE(ast.a30d, 0) AS articles_30d,
+               COALESCE(ec.cnt,   0) AS tenant_excluded_count
         FROM sources s
+        LEFT JOIN article_stats   ast ON ast.s_lower = LOWER(s.name)
+        LEFT JOIN excluded_counts ec  ON ec.dom = LOWER(s.domain)
+        LEFT JOIN health_agg      ha  ON ha.source_id = s.id
         WHERE s.tenant_id IS NULL
         ORDER BY s.category, s.source_type, s.name
     """)