feat(db): add get_active_lease_by_token helper to accounts_repo

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/db/accounts_repo.py

@@ -733,6 +733,36 @@ def cleanup_expired_leases() -> int:
         conn.close()
 
 
+def get_active_lease_by_token(conn, lease_token: str) -> Optional[dict[str, Any]]:
+    """Look up a lease by token: active and not expired.
+
+    Returns dict with id, account_id, lease_token, holder, purpose, expires_at (Unix sec),
+    status; or None if not found / inactive / expired.
+    """
+    cur = conn.cursor()
+    now = _now_unix()
+    cur.execute(
+        """
+        SELECT id, account_id, lease_token, holder, purpose, expires_at, status
+        FROM account_leases
+        WHERE lease_token = ? AND status = 'active' AND expires_at > ?
+        """,
+        (lease_token, now),
+    )
+    row = cur.fetchone()
+    if not row:
+        return None
+    return {
+        "id": row[0],
+        "account_id": row[1],
+        "lease_token": row[2],
+        "holder": row[3],
+        "purpose": row[4],
+        "expires_at": int(row[5]),
+        "status": row[6],
+    }
+
+
 # ============================================================================
 # Internal helpers
 # ============================================================================