Add documentation for days parameter in PerformanceFilter

docs/includes/pairlists.md

@@ -165,6 +165,7 @@ Example to remove the first 10 pairs from the pairlist:
 
 ```json
 "pairlists": [
+    // ...
     {
         "method": "OffsetFilter",
         "offset": 10
@@ -190,6 +191,19 @@ Sorts pairs by past trade performance, as follows:
 
 Trade count is used as a tie breaker.
 
+You can use the `days` parameter to only consider performance of the past X days.
+Not defining this parameter (or setting it to 0) will use all-time performance.
+
+```json
+"pairlists": [
+    // ...
+    {
+        "method": "PerformanceFilter",
+        "days": 10
+    }
+],
+```
+
 !!! Note
     `PerformanceFilter` does not support backtesting mode.
 

freqtrade/persistence/models.py

@@ -2,7 +2,7 @@
 This module contains the class to persist trades into SQLite
 """
 import logging
-from datetime import datetime, timezone, timedelta
+from datetime import datetime, timedelta, timezone
 from decimal import Decimal
 from typing import Any, Dict, List, Optional
 
@@ -840,7 +840,7 @@ class Trade(_DECL_BASE, LocalTrade):
         filters = [Trade.is_open.is_(False)]
         if days:
             start_date = datetime.today() - timedelta(days)
-            filters.append((Trade.close_date >= start_date))
+            filters.append(Trade.close_date >= start_date)
         pair_rates = Trade.query.with_entities(
             Trade.pair,
             func.sum(Trade.close_profit).label('profit_sum'),

freqtrade/plugins/pairlist/PerformanceFilter.py

@@ -2,7 +2,7 @@
 Performance pair list filter
 """
 import logging
-from typing import Dict, List, Any
+from typing import Any, Dict, List
 
 import pandas as pd