struct AnalyticsQuery {pub campaign_id: Option<CampaignId>,    pub ad_unit: Option<IPFS>,    pub ad_slot: Option<IPFS>,    pub ad_slot_type: Option<String>,    pub advertiser: Option<Address>,    pub publisher: Option<Address>,    pub hostname: Option<String>,    pub country: Option<String>,    pub os_name: Option<OperatingSystem>,}}impl AnalyticsQuery {    pub fn get_key(&self, key: AllowedKey) -> Option<Box<dyn ToSql + Sync + Send>> {        match key {            AllowedKey::CampaignId => self.campaign_id.map(Into::into),            AllowedKey::AdUnit => self.ad_unit.map(Into::into),            AllowedKey::AdSlot => self.ad_slot.map(Into::into),            AllowedKey::AdSlotType => self.ad_slot_type.clone().map(Into::into),            AllowedKey::Advertiser => self.advertiser.map(Into::into),            AllowedKey::Publisher => self.publisher.map(Into::into),            AllowedKey::Hostname => self.hostname.clone().map(Into::into),            AllowedKey::Country => self.country.clone().map(Into::into),            AllowedKey::OsName => self.os_name.clone().map(Into::into),        }    }}