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app.py

@@ -168,3 +168,14 @@ def dataset_summary():
 
     return summary
 
+@app.get("/check/{symbol}")
+def check_symbol(symbol: str):
+    ds = load_hf_dataset()
+    symbol = symbol.upper()
+
+    exists = any(r["symbol"].upper() == symbol for r in ds)
+
+    return {
+        "symbol": symbol,
+        "exists": exists
+    }