CREATE TABLE IF NOT EXISTS maintenance_policy (
    id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    table_name TEXT NOT NULL,
    condition_sql TEXT NOT NULL DEFAULT 'true',
    retention_period_sec INTEGER,
    max_rows INTEGER,
    vacuum_strategy TEXT NOT NULL DEFAULT 'none',
    schedule_cron TEXT NOT NULL,
    enabled INTEGER NOT NULL DEFAULT 1,
    dry_run_enabled INTEGER NOT NULL DEFAULT 0,
    last_run_at TEXT,
    last_status TEXT,
    last_error TEXT,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS maintenance_policy_config_audit (
    id TEXT PRIMARY KEY,
    policy_id TEXT,
    actor_prefix TEXT NOT NULL,
    action TEXT NOT NULL,
    before_json TEXT,
    after_json TEXT,
    created_at TEXT NOT NULL
);

ALTER TABLE postgres_maintenance_audit ADD COLUMN policy_id TEXT;