Paginate activity history and aggregate dashboard totals in SQL

app/records.py

@@ -85,14 +85,17 @@ def persist_efforts(activity):
     activity.has_route = any(sample.get("point") for sample in activity.samples)
 
 
-def record_book(activities):
+def record_book(activities, run_ids=None, presorted=False):
     """Compare persisted efforts in chronology; never read samples here.
 
     First efforts establish a record. Strict improvements earn historical PR
     badges, which remain on the run after a later activity beats that record.
     """
     records, runs = {}, {}
-    for activity in sorted(activities, key=lambda row: (row.started_at, row.id)):
+    history = (
+        activities if presorted else sorted(activities, key=lambda row: (row.started_at, row.id))
+    )
+    for activity in history:
         efforts = (
             [dict(effort) for effort in activity.best_efforts]
             if activity.efforts_version == EFFORTS_VERSION and activity.sport == "running"
@@ -103,7 +106,8 @@ def record_book(activities):
             effort["pr"] = previous is None or effort["seconds"] < previous["seconds"] - 1e-6
             if effort["pr"]:
                 records[effort["label"]] = dict(effort, activity=activity)
-        runs[activity.id] = efforts
+        if run_ids is None or activity.id in run_ids:
+            runs[activity.id] = efforts
     return {"records": [records[label] for label, _ in DISTANCES if label in records], "runs": runs}