webui: normalize the RSS schema (articles + rule_feeds tables)

Replace the JSON-blob columns (feeds.articles, rules.affected_feeds)
with proper relational tables:

- articles(feed,key,…,is_read,grabbed) with UNIQUE(feed,key) and indexes,
  so dedup and grabbed become INSERT OR IGNORE / WHERE-key queries and a
  poll inserts only new rows instead of rewriting the whole feed blob.
- rule_feeds(rule,feed) join table for a rule's feed scope.

The webui RSS engine now operates on rows via a row-level store API
(feed/article/rule/indexer upsert/list/etc.) instead of holding the
feeds/rules/indexers in memory and saving whole lists; the in-memory
copies and rss_save/rss_load are gone. The poller, the auto-download
rules, force-run, manual download, refresh and search all read/write the
DB directly. A one-time migration upgrades an existing webui.db in place
(moving the old JSON blobs into the new tables, preserving article
read/grabbed flags and rule scoping, then dropping the legacy columns).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/webui/webui_store.h

@@ -52,14 +52,42 @@ bool webui_store_load_categories(webui_store *s, json_t *out);
 bool webui_store_save_tags(webui_store *s, json_t *tags);
 bool webui_store_load_tags(webui_store *s, json_t *out);
 
-/* --- RSS: feeds, auto-download rules, Torznab indexers (owned here) -------- *
- * save_* replace the whole list atomically; load_* append to the array `out`,
- * rebuilding the exact JSON shapes the web layer/UI use. */
-bool webui_store_save_feeds(webui_store *s, json_t *feeds);
-bool webui_store_load_feeds(webui_store *s, json_t *out);
-bool webui_store_save_rules(webui_store *s, json_t *rules);
-bool webui_store_load_rules(webui_store *s, json_t *out);
-bool webui_store_save_indexers(webui_store *s, json_t *indexers);
-bool webui_store_load_indexers(webui_store *s, json_t *out);
+/* --- RSS: feeds, articles, auto-download rules, Torznab indexers ----------- *
+ * Fully relational: articles live in their own table (deduped by feed+key,
+ * indexed), and a rule's feed scope lives in a rule_feeds join table. The web
+ * layer operates on rows, not whole-list blobs. */
+
+/* Feeds. upsert preserves an existing feed's lastUpdate (only the url changes);
+ * remove also drops the feed's articles. feed_list appends
+ * {name,url,lastUpdate,articles:[...]} (newest article first). feed_targets
+ * appends lightweight {name,url} objects for the poller. */
+bool webui_store_feed_upsert(webui_store *s, const char *name, const char *url);
+bool webui_store_feed_remove(webui_store *s, const char *name);
+bool webui_store_feed_set_updated(webui_store *s, const char *name, long ts);
+bool webui_store_feed_list(webui_store *s, json_t *out);
+bool webui_store_feed_targets(webui_store *s, json_t *out);
+bool webui_store_feed_exists(webui_store *s, const char *name);
+
+/* Articles. add inserts unless (feed,key) already exists: returns 1 if newly
+ * inserted, 0 if a duplicate, -1 on error. trim keeps the newest `keep` for a
+ * feed. mark_grabbed flags every article with this key. ungrabbed appends
+ * {feed,key,title,magnet,torrentUrl} for not-yet-grabbed articles. */
+int  webui_store_article_add(webui_store *s, const char *feed, json_t *article);
+bool webui_store_article_trim(webui_store *s, const char *feed, int keep);
+bool webui_store_article_mark_grabbed(webui_store *s, const char *key);
+bool webui_store_articles_ungrabbed(webui_store *s, json_t *out);
+
+/* Rules. upsert replaces the rule row and its feed scope; list/get assemble the
+ * rule with its affectedFeeds array. */
+bool webui_store_rule_upsert(webui_store *s, json_t *rule);
+bool webui_store_rule_remove(webui_store *s, const char *name);
+bool webui_store_rule_list(webui_store *s, json_t *out);
+json_t *webui_store_rule_get(webui_store *s, const char *name);
+bool webui_store_rule_set_match(webui_store *s, const char *name, long ts);
+
+/* Torznab indexers. */
+bool webui_store_indexer_upsert(webui_store *s, json_t *indexer);
+bool webui_store_indexer_remove(webui_store *s, const char *name);
+bool webui_store_indexer_list(webui_store *s, json_t *out);
 
 #endif /* NAUT_WEBUI_STORE_H */