[relocator] Serialize visualization for postgres before inserting
[relocator] Serialize visualization for postgres before inserting

thorncp/cartodb,raquel-ucl/cartodb,nyimbi/cartodb,UCL-ShippingGroup/cartodb-1,dbirchak/cartodb,future-analytics/cartodb,thorncp/cartodb,splashblot/dronedb,nuxcode/cartodb,splashblot/dronedb,bloomberg/cartodb,CartoDB/cartodb,splashblot/dronedb,CartoDB/cartodb,bloomberg/cartodb,DigitalCoder/cartodb,bloomberg/cartodb,DigitalCoder/cartodb,bloomberg/cartodb,raquel-ucl/cartodb,DigitalCoder/cartodb,dbirchak/cartodb,splashblot/dronedb,codeandtheory/cartodb,UCL-ShippingGroup/cartodb-1,codeandtheory/cartodb,UCL-ShippingGroup/cartodb-1,nyimbi/cartodb,future-analytics/cartodb,codeandtheory/cartodb,dbirchak/cartodb,UCL-ShippingGroup/cartodb-1,nuxcode/cartodb,future-analytics/cartodb,UCL-ShippingGroup/cartodb-1,CartoDB/cartodb,thorncp/cartodb,DigitalCoder/cartodb,thorncp/cartodb,CartoDB/cartodb,raquel-ucl/cartodb,nyimbi/cartodb,dbirchak/cartodb,nuxcode/cartodb,codeandtheory/cartodb,nyimbi/cartodb,raquel-ucl/cartodb,CartoDB/cartodb,future-analytics/cartodb,codeandtheory/cartodb,raquel-ucl/cartodb,future-analytics/cartodb,DigitalCoder/cartodb,nuxcode/cartodb,thorncp/cartodb,nyimbi/cartodb,bloomberg/cartodb,dbirchak/cartodb,splashblot/dronedb,nuxcode/cartodb