feat: google cloud billing style analytics and robust reporting API

dashboard/server.py

@@ -73,22 +73,63 @@ async def get_summary():
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))
 
-@app.get("/api/comparison")
-async def get_comparison(days: int = 7):
-    # Aggregated volume per exchange per day
-    # QuestDB date_trunc('day', timestamp) is good. 
-    # We ensure we get exchange, day, and metrics.
-    query = f"""
-    select 
-        exchange, 
-        date_trunc('day', timestamp) as day, 
-        sum(price * quantity) as daily_volume, 
-        count(*) as trade_count
-    from trades 
-    where timestamp > dateadd('d', -{days}, now())
-    group by exchange, day
-    order by day asc
-    """
+@app.get("/api/analytics")
+async def get_analytics(
+    metric: str = "volume", 
+    group_by: str = "day", 
+    sub_group_by: str = None,
+    date_from: str = None, 
+    date_to: str = None,
+    isins: str = None,
+    continents: str = None
+):
+    metrics_map = {
+        "volume": "sum(t.price * t.quantity)",
+        "count": "count(*)",
+        "avg_price": "avg(t.price)"
+    }
+    
+    groups_map = {
+        "day": "date_trunc('day', t.timestamp)",
+        "month": "date_trunc('month', t.timestamp)",
+        "exchange": "t.exchange",
+        "isin": "t.isin",
+        "name": "coalesce(m.name, t.isin)",
+        "continent": "coalesce(m.continent, 'Unknown')",
+        "sector": "coalesce(m.sector, 'Unknown')"
+    }
+    
+    selected_metric = metrics_map.get(metric, metrics_map["volume"])
+    selected_group = groups_map.get(group_by, groups_map["day"])
+    
+    # We always join metadata to allow filtering by continent/sector even if not grouping by them
+    query = f"select {selected_group} as label"
+    
+    if sub_group_by and sub_group_by in groups_map:
+        query += f", {groups_map[sub_group_by]} as sub_label"
+        
+    query += f", {selected_metric} as value from trades t"
+    query += " left join metadata m on t.isin = m.isin where 1=1"
+    
+    if date_from:
+        query += f" and t.timestamp >= '{date_from}'"
+    if date_to:
+        query += f" and t.timestamp <= '{date_to}'"
+        
+    if isins:
+        isins_list = ",".join([f"'{i.strip()}'" for i in isins.split(",")])
+        query += f" and t.isin in ({isins_list})"
+
+    if continents:
+        cont_list = ",".join([f"'{c.strip()}'" for c in continents.split(",")])
+        query += f" and m.continent in ({cont_list})"
+        
+    query += " group by label"
+    if sub_group_by and sub_group_by in groups_map:
+        query += ", sub_label"
+    
+    query += " order by label asc"
+    
     try:
         response = requests.get(f"http://{DB_HOST}:9000/exec", params={'query': query}, auth=DB_AUTH)
         if response.status_code == 200: