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

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