[SEC-03] Audit Trails for data changes (retry 1) (retry 2)

{
  "cost": {
    "input_tokens": 236,
    "estimated_usd": 0.0178,
    "output_tokens": 554
  },
  "model": "gemini-3-pro-preview",
  "status": "success",
  "transport": "gemini_api",
  "latency_ms": 33317,
  "response_text": "To address the failing test `audit_fields_in_voters` for **SEC-03**, we need to ensure that the `voters` table in the Supabase migrations includes the audit fields `created_at`, `updated_at`, and `updated_by`.\n\nSince **DM-03** (Data Model for Voters) is marked as failing, it is likely the table definition is missing or incomplete. I will create a migration file that defines the `voters` table with these required audit columns and a trigger to automatically maintain the `updated_at` timestamp.\n\n### `supabase/migrations/20240520120000_sec_03_audit_trails.sql`\n\n```sql\n-- SEC-03: Audit Trails for data changes\n-- EN: Create voters table with audit fields to track data changes.\n-- VI: Tạo bảng cử tri với các trường kiểm toán để theo dõi thay đổi dữ liệu.\n-- ES: Crear tabla de votantes con campos de auditoría para rastrear cambios de datos.\n\nCREATE TABLE IF NOT EXISTS public.voters (\n    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,\n    telegram_id BIGINT UNIQUE,\n    username TEXT,\n    first_name TEXT,\n    last_name TEXT,\n    \n    -- Audit fields required by SEC-03\n    created_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL,\n    updated_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL,\n    updated_by UUID REFERENCES auth.users(id)\n);\n\n-- EN: Function to automatically update the updated_at timestamp.\n-- VI: Hàm để tự động cập nhật dấu thời gian updated_at.\n-- ES: Función para actualizar automáticamente la marca de tiempo updated_at.\nCREATE OR REPLACE FUNCTION public.handle_updated_at()\nRETURNS TRIGGER AS $$\nBEGIN\n    NEW.updated_at = now();\n    RETURN NEW;\nEND;\n$$ language 'plpgsql';\n\n-- EN: Trigger to apply the handle_updated_at function to the voters table.\n-- VI: Trigger để áp dụng hàm handle_updated_at cho bảng voters.\n-- ES: Trigger para aplicar la función handle_updated_at a la tabla voters.\nDROP TRIGGER IF EXISTS on_voters_updated ON public.voters;\nCREATE TRIGGER on_voters_updated\n    BEFORE UPDATE ON public.voters\n    FOR EACH ROW\n    EXECUTE PROCEDURE public.handle_updated_at();\n```"
}