ALTER TABLE mail_folders ADD COLUMN last_uid BIGINT NOT NULL DEFAULT 0;

CREATE TABLE rule_executions (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    rule_id UUID NOT NULL REFERENCES mail_rules(id) ON DELETE CASCADE,
    message_id UUID NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
    actions_applied JSONB NOT NULL DEFAULT '[]',
    error TEXT NOT NULL DEFAULT '',
    executed_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_rule_executions_rule_id ON rule_executions(rule_id);
CREATE INDEX idx_rule_executions_message_id ON rule_executions(message_id);
CREATE INDEX idx_rule_executions_executed_at ON rule_executions(executed_at);