CREATE TABLE IF NOT EXISTS audit_logs (
    id BIGINT GENERATED BY DEFAULT AS IDENTITY,
    actor_id BIGINT,
    actor_username VARCHAR(50),
    action SMALLINT NOT NULL,
    target_type SMALLINT,
    target_id VARCHAR(100),
    details JSONB,
    ip_address TEXT,
    user_agent TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    CHECK (details IS NULL OR jsonb_typeof(details) = 'object'),
    PRIMARY KEY (id, created_at)
) PARTITION BY RANGE (created_at);

CREATE INDEX IF NOT EXISTS idx_audit_logs_actor_created
    ON audit_logs(actor_id, created_at DESC)
    WHERE actor_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_audit_logs_action_created
    ON audit_logs(action, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_audit_logs_target_created
    ON audit_logs(target_type, target_id, created_at DESC)
    WHERE target_type IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_audit_logs_ip_address
    ON audit_logs(ip_address)
    WHERE ip_address IS NOT NULL;