fix: fix CSM-010

lib/bds/repo.ex

@@ -2,4 +2,22 @@ defmodule BDS.Repo do
   use Ecto.Repo,
     otp_app: :bds,
     adapter: Ecto.Adapters.SQLite3
+
+  @doc """
+  Returns true if the database is connected and core tables exist.
+  Used to guard data access during startup before migrations have run.
+  """
+  def ready? do
+    case Ecto.Adapters.SQL.query(
+           __MODULE__,
+           "SELECT 1 FROM sqlite_master WHERE type = ?1 AND name = ?2 LIMIT 1",
+           ["table", "projects"]
+         ) do
+      {:ok, %{num_rows: 1}} -> true
+      {:ok, _} -> false
+      {:error, _} -> false
+    end
+  rescue
+    _ -> false
+  end
 end