更新

backend/main.py

@@ -2567,14 +2567,25 @@ async def get_logs(
     if account_id is not None:
         await get_owned_account(db, user, account_id)
     limit = max(1, min(int(limit or 50), 500))
-    stmt = (
+    # Fetch only primary keys while MySQL performs the cross-account sort.
+    # Selecting the full ORM row here includes MEDIUMTEXT/TEXT columns, which
+    # makes MySQL 5.7 materialize a huge on-disk temporary table for non-admin
+    # users. Under polling load that grew ibtmp1 by tens of gigabytes.
+    id_stmt = (
         logs_for_user(user, account_id)
+        .with_only_columns(MessageLog.id)
         .order_by(MessageLog.created_at.desc())
         .offset(max(0, int(offset or 0)))
         .limit(limit)
     )
-    result = await db.execute(stmt)
-    return result.scalars().all()
+    ordered_ids = list((await db.execute(id_stmt)).scalars().all())
+    if not ordered_ids:
+        return []
+    rows = (
+        await db.execute(select(MessageLog).where(MessageLog.id.in_(ordered_ids)))
+    ).scalars().all()
+    rows_by_id = {row.id: row for row in rows}
+    return [rows_by_id[row_id] for row_id in ordered_ids if row_id in rows_by_id]
 
 
 @app.get("/api/received-messages", response_model=List[ReceivedMessageLogResponse])
@@ -2588,13 +2599,26 @@ async def get_received_messages(
     if account_id is not None:
         await get_owned_account(db, user, account_id)
     limit = max(1, min(int(limit or 100), 500))
-    stmt = (
+    # Keep the global sort narrow for the same reason as /api/logs. raw_content
+    # can be large and must only be loaded after LIMIT has selected the IDs.
+    id_stmt = (
         received_logs_for_user(user, account_id)
+        .with_only_columns(ReceivedMessageLog.id)
         .order_by(ReceivedMessageLog.created_at.desc())
         .limit(limit)
     )
-    result = await db.execute(stmt)
-    return result.scalars().all()
+    ordered_ids = list((await db.execute(id_stmt)).scalars().all())
+    if not ordered_ids:
+        return []
+    rows = (
+        await db.execute(
+            select(ReceivedMessageLog).where(
+                ReceivedMessageLog.id.in_(ordered_ids)
+            )
+        )
+    ).scalars().all()
+    rows_by_id = {row.id: row for row in rows}
+    return [rows_by_id[row_id] for row_id in ordered_ids if row_id in rows_by_id]
 
 
 @app.get("/api/system-logs", response_model=List[SystemLogResponse])