fix: restore polished account experience and align AI with Lark design

backend/app/account_data.py

@@ -0,0 +1,65 @@
+"""Account snapshots with an explicit local daily simulation allowance."""
+
+from datetime import datetime
+from zoneinfo import ZoneInfo
+
+from .alphas import number
+
+LOCAL_DAILY_SIMULATION_LIMIT = 10_000
+
+
+def daily_activity(raw, today, daily_limit=None):
+    """Read recordset columns by schema; missing dates are not reported as zero usage."""
+    recordset = raw.get("records", {})
+    if not isinstance(recordset, dict):
+        raise ValueError("Invalid activity recordset")
+    schema = recordset.get("schema", {})
+    if not isinstance(schema, dict):
+        raise ValueError("Invalid activity schema")
+    properties, rows = schema.get("properties", []), recordset.get("records", [])
+    if not isinstance(properties, list) or not isinstance(rows, list):
+        raise ValueError("Invalid activity records")
+    names = [p.get("name") if isinstance(p, dict) else p for p in properties]
+    count = None
+    if "date" in names and "value" in names:
+        for row in rows:
+            if isinstance(row, list) and len(row) >= len(names) and row[names.index("date")] == today:
+                count = number(row[names.index("value")])
+    result = {
+        "today": count,
+        "limit": daily_limit,
+        "remaining": max(0, daily_limit - count) if daily_limit is not None and count is not None else None,
+    }
+    for key in ("yesterday", "total"):
+        period = raw.get(key)
+        result[key] = number(period.get("value")) if isinstance(period, dict) else None
+        if key == "yesterday":
+            result["yesterday_date"] = period.get("end") if isinstance(period, dict) else None
+    # The allowance is a user-chosen local budget, not a platform quota.
+    # Missing activity must not imply that the whole daily budget is available.
+    return result
+
+
+def usage_snapshot(data, errors, at=None):
+    today = (at or datetime.now(ZoneInfo("America/New_York"))).date().isoformat()
+    activities, errors = {}, dict(errors)
+    for key in ("simulations", "submissions"):
+        if key in data:
+            try:
+                activities[key] = daily_activity(
+                    data[key],
+                    today,
+                    daily_limit=LOCAL_DAILY_SIMULATION_LIMIT if key == "simulations" else None,
+                )
+            except ValueError:
+                errors[key] = "平台用量数据格式无法识别"
+    return {
+        "date": today,
+        "timezone": "America/New_York",
+        **activities,
+        "alphas": {
+            key: number(data.get("alphas", {}).get(key))
+            for key in ("unsubmitted", "active", "decommissioned")
+        },
+        "errors": errors,
+    }