Hour power update

plot_power.py

@@ -11,6 +11,7 @@ import matplotlib.pyplot as plt
 
 CSV_PATH = "power_log.csv"
 OUTPUT_FILE = "power_graph.png"
+RETENTION_SECONDS = 3600
 
 print(f"📊 Reading {CSV_PATH}...")
 
@@ -23,6 +24,11 @@ df = pd.read_csv(
 
 # --- Convert timestamps ---
 df["timestamp"] = pd.to_datetime(df["timestamp"], errors="coerce")
+latest_ts = df["timestamp"].dropna().max()
+if pd.notna(latest_ts):
+    cutoff = latest_ts - pd.Timedelta(seconds=RETENTION_SECONDS)
+    df = df[df["timestamp"] >= cutoff]
+
 df["time_fmt"] = df["timestamp"].dt.strftime("%Y-%m-%d %H:%M:%S")
 
 # --- Downsample if too many entries ---
@@ -61,4 +67,3 @@ plt.grid(axis="y", alpha=0.3)
 plt.tight_layout()
 plt.savefig(OUTPUT_FILE, dpi=150)
 print(f"✅ Saved graph: {OUTPUT_FILE}")
-