diff --git a/src/blackboard/db.py b/src/blackboard/db.py
index dec31fc..05c0344 100644
--- a/src/blackboard/db.py
+++ b/src/blackboard/db.py
@@ -232,6 +232,7 @@ _SCHEMA_STATEMENTS = [
     "CREATE INDEX IF NOT EXISTS idx_tasks_status ON tasks(status)",
     "CREATE INDEX IF NOT EXISTS idx_tasks_assignee ON tasks(assignee)",
     "CREATE INDEX IF NOT EXISTS idx_tasks_parent ON tasks(parent_task)",
+    "CREATE INDEX IF NOT EXISTS idx_tasks_card ON tasks(card_id)",
 
     # comments
     """CREATE TABLE IF NOT EXISTS comments (
@@ -392,3 +393,24 @@ _SCHEMA_STATEMENTS = [
     "CREATE INDEX IF NOT EXISTS idx_routing_mode ON routing_decisions(mode)",
     "CREATE INDEX IF NOT EXISTS idx_routing_time ON routing_decisions(created_at)",
 ]
+
+# ---------------------------------------------------------------------------
+# Cards Schema (v2.7)
+# ---------------------------------------------------------------------------
+
+_CARDS_SCHEMA = [
+    """CREATE TABLE IF NOT EXISTS cards (
+        id TEXT PRIMARY KEY,
+        name TEXT NOT NULL,
+        description TEXT DEFAULT '',
+        card_type TEXT DEFAULT 'default' CHECK (card_type IN ('default','strategy','data_pipeline','research','platform','bugfix','mail')),
+        stages_json TEXT DEFAULT '[]',
+        labels_json TEXT DEFAULT '[]',
+        status TEXT DEFAULT 'active' CHECK (status IN ('active','pending','working','review','done','failed','blocked','cancelled','archived','deleted')),
+        created_at TEXT NOT NULL DEFAULT (datetime('now')),
+        updated_at TEXT,
+        archived_at TEXT
+    )""",
+    "CREATE INDEX IF NOT EXISTS idx_cards_id ON cards(id)",
+    "CREATE INDEX IF NOT EXISTS idx_cards_status ON cards(status)",
+]