update

backend/app/db.py

@@ -75,6 +75,21 @@ def since(conn, collection, seq):
     return [json.loads(r["data"]) for r in rows]
 
 
+def since_paged(conn, collection, seq, max_bytes):
+    """Wie since, aber höchstens max_bytes Daten. Gibt (Einträge, letzter seq, mehr da) zurück."""
+    rows = conn.execute(
+        "SELECT data, seq FROM items WHERE collection = ? AND seq > ? ORDER BY seq", (collection, seq)
+    )
+    items, size, last = [], 0, seq
+    for r in rows:
+        if items and size + len(r["data"]) > max_bytes:
+            return items, last, True
+        items.append(json.loads(r["data"]))
+        size += len(r["data"])
+        last = r["seq"]
+    return items, last, False
+
+
 def alive(conn, collection):
     rows = conn.execute(
         "SELECT data FROM items WHERE collection = ? AND deleted = 0 ORDER BY id", (collection,)