diff --git a/src/blackboard/db.py b/src/blackboard/db.py
index f9b131c..06b1bc7 100644
--- a/src/blackboard/db.py
+++ b/src/blackboard/db.py
@@ -289,6 +289,20 @@ _SCHEMA_STATEMENTS = [
     "CREATE INDEX IF NOT EXISTS idx_comments_type ON comments(task_id, comment_type)",
     "CREATE INDEX IF NOT EXISTS idx_comments_author ON comments(author)",
 
+    # mention_queue
+    """CREATE TABLE IF NOT EXISTS mention_queue (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        comment_id INTEGER NOT NULL REFERENCES comments(id),
+        task_id TEXT NOT NULL REFERENCES tasks(id),
+        mentioned_agent TEXT NOT NULL,
+        status TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'notified', 'failed')),
+        retry_count INTEGER DEFAULT 0,
+        created_at TEXT NOT NULL DEFAULT (datetime('now')),
+        notified_at TEXT
+    )""",
+    "CREATE INDEX IF NOT EXISTS idx_mention_queue_status ON mention_queue(status)",
+    "CREATE INDEX IF NOT EXISTS idx_mention_queue_agent ON mention_queue(mentioned_agent, status)",
+
     # outputs
     """CREATE TABLE IF NOT EXISTS outputs (
         id INTEGER PRIMARY KEY AUTOINCREMENT,