wired up mesh subscriptions + search

- Subscriptions now use Reticulum destination hashes instead of HTTP URLs
- All subscription syncing happens over encrypted RNS links (rns_client.py)
- Add remote_pages table for synced content from subscriptions
- Search results now include pages from synced subscriptions, grouped by source
- Remove HTTP dependency from subscription handlers

db.py

@@ -47,12 +47,27 @@ def init_db():
     db.execute(
         "CREATE TABLE IF NOT EXISTS subscriptions ("
         "  id INTEGER PRIMARY KEY AUTOINCREMENT,"
-        "  url TEXT UNIQUE NOT NULL,"
+        "  dest_hash TEXT UNIQUE NOT NULL,"
         "  name TEXT DEFAULT '',"
         "  auto_sync INTEGER DEFAULT 0,"
         "  last_sync TEXT DEFAULT ''"
         ")"
     )
+    db.execute(
+        "CREATE TABLE IF NOT EXISTS remote_pages ("
+        "  id INTEGER PRIMARY KEY AUTOINCREMENT,"
+        "  subscription_id INTEGER NOT NULL,"
+        "  url TEXT NOT NULL,"
+        "  title TEXT,"
+        "  note TEXT DEFAULT '',"
+        "  FOREIGN KEY (subscription_id) REFERENCES subscriptions(id) ON DELETE CASCADE,"
+        "  UNIQUE(subscription_id, url)"
+        ")"
+    )
+    db.execute(
+        "CREATE VIRTUAL TABLE IF NOT EXISTS remote_pages_fts "
+        "USING fts5(title, url, note, content=remote_pages, content_rowid=id)"
+    )
     db.executescript("""
         CREATE TRIGGER IF NOT EXISTS pages_ai AFTER INSERT ON pages BEGIN
             INSERT INTO pages_fts(rowid, title, body, url, note)
@@ -68,7 +83,27 @@ def init_db():
             INSERT INTO pages_fts(rowid, title, body, url, note)
             VALUES (new.id, new.title, new.body, new.url, new.note);
         END;
+        CREATE TRIGGER IF NOT EXISTS remote_pages_ai AFTER INSERT ON remote_pages BEGIN
+            INSERT INTO remote_pages_fts(rowid, title, url, note)
+            VALUES (new.id, new.title, new.url, new.note);
+        END;
+        CREATE TRIGGER IF NOT EXISTS remote_pages_ad AFTER DELETE ON remote_pages BEGIN
+            INSERT INTO remote_pages_fts(remote_pages_fts, rowid, title, url, note)
+            VALUES ('delete', old.id, old.title, old.url, old.note);
+        END;
+        CREATE TRIGGER IF NOT EXISTS remote_pages_au AFTER UPDATE ON remote_pages BEGIN
+            INSERT INTO remote_pages_fts(remote_pages_fts, rowid, title, url, note)
+            VALUES ('delete', old.id, old.title, old.url, old.note);
+            INSERT INTO remote_pages_fts(rowid, title, url, note)
+            VALUES (new.id, new.title, new.url, new.note);
+        END;
     """)
+    # Migrate old subscriptions table if needed
+    cols = [row[1] for row in db.execute("PRAGMA table_info(subscriptions)").fetchall()]
+    if "url" in cols and "dest_hash" not in cols:
+        db.execute("ALTER TABLE subscriptions RENAME COLUMN url TO dest_hash")
+        db.commit()
+
     db.commit()
     db.close()