feat: move the terminal fully into the ssh-terminal plugin (B9)

src/backend/database/db/performance-indexes.ts

@@ -105,14 +105,9 @@ export const PERFORMANCE_INDEXES: PerformanceIndex[] = [
     table: "recent_activity",
     columns: "user_id, timestamp",
   },
-  {
-    name: "idx_command_history_user_host",
-    table: "command_history",
-    columns: "user_id, host_id",
-  },
-  // file_manager_recent, file_manager_pinned, file_manager_shortcuts and
-  // transfer_recent are owned by the file-manager plugin now; its adopted
-  // table definitions carry these same indexes across the rename.
+  // file_manager_recent, file_manager_pinned, file_manager_shortcuts,
+  // transfer_recent and command_history are owned by plugins now; their
+  // adopted table definitions carry these same indexes across the rename.
   {
     name: "idx_user_open_tabs_user_id",
     table: "user_open_tabs",