Initial upload

app/utils.py

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+import datetime
+
+def human_size(n: int | None) -> str:
+    if n is None: return ""
+    units = ["B","KB","MB","GB","TB","PB"]
+    i = 0
+    x = float(n)
+    while x >= 1024 and i < len(units)-1:
+        x /= 1024.0
+        i += 1
+    return f"{x:.0f} {units[i]}"
+
+def fmt_when(iso: str | None) -> str:
+    if not iso: return ""
+    try:
+        dt = datetime.datetime.fromisoformat(iso.replace("Z","+00:00")).astimezone()
+        return dt.strftime("%Y-%m-%d %H:%M")
+    except Exception:
+        return iso or ""