fvg and ob indicators

Front-end start

backend/indicators/fvg.py

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+def find_fvgs(candles):
+    fvgs = []
+
+    for i in range(2, len(candles)):
+        c1 = candles[i - 2]
+        c2 = candles[i - 1]
+        c3 = candles[i]
+
+        # Bullish
+        if c1.high < c3.low:
+            fvgs.append({
+                "index": i - 1,
+                "type": "bullish",
+                "top": c3.low,
+                "bottom": c1.high
+            })
+
+        # bearish
+        elif c1.low > c3.high:
+            fvgs.append({
+                "index": i - 1,
+                "type": "bearish",
+                "top": c1.low,
+                "bottom": c3.high
+            })
+
+    return fvgs

backend/indicators/order_blocks.py

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+def find_order_blocks(candles, structure, min_impulse=0.10):
+    obs = []
+
+    for point in structure:
+        if point["label"] == "HH":
+            # Bullish break of structure, look back for last bearish candle
+            idx = point["index"]
+            for j in range(idx - 1, max(idx - 20, 0), -1):
+                if candles[j].close < candles[j].open:
+                    obs.append({
+                        "index": j,
+                        "type": "bullish",
+                        "top": candles[j].open,
+                        "bottom": candles[j].close
+                    })
+                    break
+
+        elif point["label"] == "LL":
+            # Bearish break of structure, look back for last bullish candle
+            idx = point["index"]
+            for j in range(idx - 1, max(idx - 20, 0), -1):
+                if candles[j].close > candles[j].open:
+                    obs.append({
+                        "index": j,
+                        "type": "bearish",
+                        "top": candles[j].close,
+                        "bottom": candles[j].open
+                    })
+                    break
+
+    return obs