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Persistent MQL5 Compilation Errors: HistoryDeals.mqh Not Found / Ambiguous Calls / Undeclared Identifiers - After Multiple Reinstalls

Dear MQL5.community, I am experiencing extremely frustrating and persistent compilation errors with my Expert Advisor (EA) in MetaEditor, and I've exhausted all standard troubleshooting steps. I'm hoping someone can provide insight into what might be a deeper issue with my MetaTrader 5 installation