how to search an existing object string in non persistable enetity

im using db connector and im trying to create a synchronize db microflows where on it clicked it will add new rows that doesnt have an existing id in local, and delete rows in local that doesnt have the same id in external database im trying to looping the local db list so when it looped the non existing id in external comes up it got deleted, but i cant do that since i cant retrieve external data in microflows is there a way ??? please help me (i cant use database replication because my external db is mysql)
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