Source feeds: click a source to see its publication feed

Click a source name on any card → a feed of just that source's articles,
newest-first, still accepted / non-duplicate / boundary-filtered (the calm
promise isn't bypassed). A natural way to follow a publication's feel.

* queries.feed + /api/feed: source_id filter; Article output gains source_id.
* Frontend: source label is a button → transient 'source:<id>' view (like
  'tag:<slug>'), rendered in the feed grid with Load more, header = source name.
* Ad-hoc, not a pinned lane. Foundation for a future source page (metadata) +
  Follow; shareable /source/<slug> route and source_view analytics come then.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

goodnews/api.py

@@ -241,6 +241,7 @@ class Article(BaseModel):
     image_url: str | None = None
     published_at: str | None = None
     source: str
+    source_id: int | None = None
     topic: str | None = None
     flavor: str | None = None
     accepted: bool
@@ -265,6 +266,7 @@ class Article(BaseModel):
             image_url=row.get("image_url"),
             published_at=row.get("published_at"),
             source=row["source_name"],
+            source_id=row.get("source_id"),
             topic=row.get("topic"),
             flavor=row.get("flavor"),
             accepted=bool(row.get("accepted")),
@@ -921,6 +923,7 @@ def create_app() -> FastAPI:
         prefs: str | None = Query(None),
         exclude: str = Query("", description="comma-separated article ids the reader has dismissed"),
         tag: str | None = Query(None, description="grouping tag to browse"),
+        source_id: int | None = Query(None, ge=1, description="show only this source's articles"),
         sort: str = Query("ranked", pattern="^(ranked|latest)$", description="ranked (best-first) or latest (newest-first)"),
     ) -> FeedResponse:
         if topic and topic.lower() not in TOPICS:
@@ -940,14 +943,14 @@ def create_app() -> FastAPI:
                 fetch_n = min(2000, (offset + limit) * 4 + 50 + len(excl))
                 raw = queries.feed(
                     conn, topic=topic, flavor=flavor, accepted_only=accepted_only,
-                    limit=fetch_n, offset=0, tag=tag, sort=sort, **kw,
+                    limit=fetch_n, offset=0, tag=tag, source_id=source_id, sort=sort, **kw,
                 )
                 kept = [a for a in filter_articles(raw, fp, now) if a["id"] not in excl]
                 rows = kept[offset : offset + limit]
             else:
                 rows = queries.feed(
                     conn, topic=topic, flavor=flavor, accepted_only=accepted_only,
-                    limit=limit, offset=offset, tag=tag, sort=sort, **kw,
+                    limit=limit, offset=offset, tag=tag, source_id=source_id, sort=sort, **kw,
                 )
         # Keep the top of a browse view readable: stable-sort paywalled items
         # below readable ones (composite order preserved within each group).

goodnews/queries.py

@@ -25,6 +25,7 @@ _ARTICLE_COLUMNS = f"""
     a.canonical_url,
     a.published_at,
     a.image_url,
+    a.source_id,
     src.name AS source_name,
     s.topic,
     s.flavor,
@@ -57,6 +58,7 @@ def feed(
     max_cortisol: int | None = None,
     max_ragebait: int | None = None,
     tag: str | None = None,
+    source_id: int | None = None,
     sort: str = "ranked",
 ) -> list[dict]:
     """Return articles with categorical filters applied in SQL.
@@ -106,6 +108,9 @@ def feed(
     if tag:
         clauses.append("EXISTS (SELECT 1 FROM article_tags at WHERE at.article_id = a.id AND at.tag = ?)")
         params.append(tag.lower())
+    if source_id:
+        clauses.append("a.source_id = ?")
+        params.append(source_id)
 
     where = "WHERE " + " AND ".join(clauses)
     params.extend([limit, offset])