Fix deprecated pandas indexing

metobsapi/util/query_influx.py

 """Helpers for querying an InfluxDB backend."""
+
 from datetime import datetime, timedelta
 from typing import TypeAlias
 
@@ -76,13 +77,12 @@ class QueryHandler:
             frame = frame.set_index("time")
             frame = frame.fillna(value=np.nan)
             frames.append(frame)
-        frame = pd.concat(frames, axis=1, copy=False)
-        return frame
+        return pd.concat(frames, axis=1, copy=False)
 
     def _convert_v2_result_to_api_dataframe(self, result: QueryResult) -> pd.DataFrame:
         frames_to_concat = []
         for (site, inst), symbol_names in self._symbols.items():
-            frames_for_inst = [df for df in result if df["site"][0] == site and df["inst"][0] == inst]
+            frames_for_inst = [df for df in result if df["site"].iloc[0] == site and df["inst"].iloc[0] == inst]
             if not frames_for_inst:
                 data_frame = pd.DataFrame(columns=["_time", *symbol_names])
                 data_frame = data_frame.set_index("_time")
@@ -117,8 +117,7 @@ def _build_queries_v1(symbols, begin, end, interval):
             where_clause=" AND ".join(wc),
         )
         queries.append(query)
-    queries = "; ".join(queries)
-    return queries
+    return "; ".join(queries)
 
 
 def parse_dt_v1(d):

pyproject.toml

@@ -28,6 +28,8 @@ exclude = '''
 
 [tool.ruff]
 line-length = 120
+
+[tool.ruff.lint]
 select = [
     "E", "F", "W", "C90", "I", "N", "D", "UP", "YTT", "S", "BLE", "B", "A",
     "COM", "C4", "T10", "EXE", "ISC", "ICN", "INP", "PIE", "T20", "PYI", "PT",
@@ -36,7 +38,7 @@ select = [
 ]
 ignore = ["D100", "D101", "D102", "D103", "D104", "D106", "D107", "D203", "D213", "B008"]
 
-[tool.ruff.per-file-ignores]
+[tool.ruff.lint.per-file-ignores]
 "metobsapi/tests/*" = ["S", "PLR2004"]
 
 [tool.mypy]