style: format code with ruff

app/routers/nl2sql.py

@@ -76,7 +76,7 @@ def nl2sql_handler(request: NL2SQLRequest):
         raise HTTPException(status_code=400, detail=detail)
 
     # --- Success case ---
-    traces = [ _round_trace(t) for t in (result.traces or []) ]
+    traces = [_round_trace(t) for t in (result.traces or [])]
     return NL2SQLResponse(
         ambiguous=False,
         sql=result.sql,

nl2sql/pipeline.py

@@ -211,13 +211,17 @@ class Pipeline:
                     details.extend(r_safe.error or [])
                     continue
 
-                r_exec = self._safe_stage(self.executor.run, sql=r_safe.data.get("sql", sql))
+                r_exec = self._safe_stage(
+                    self.executor.run, sql=r_safe.data.get("sql", sql)
+                )
                 traces.extend(self._trace_list(r_exec))
                 if not r_exec.ok:
                     details.extend(r_exec.error or [])
                     continue
 
-                r_ver = self._safe_stage(self.verifier.run, sql=sql, exec_result=r_exec.data)
+                r_ver = self._safe_stage(
+                    self.verifier.run, sql=sql, exec_result=r_exec.data
+                )
                 traces.extend(self._trace_list(r_ver))
                 verified = bool(r_ver.ok)
                 if verified:

nl2sql/types.py

@@ -27,7 +27,8 @@ class FinalResult:
     Final domain result of the whole pipeline.
     Adapters (HTTP/CLI/UI) should serialize this to dict/JSON at the boundary.
     """
-    ok: bool                   # end-to-end success
+
+    ok: bool  # end-to-end success
     ambiguous: bool
     error: bool
     sql: Optional[str]

tests/test_nl2sql_router.py

@@ -4,10 +4,12 @@ from nl2sql.pipeline import FinalResult
 
 client = TestClient(app)
 
+
 def fake_trace(stage: str) -> dict:
     # FinalResult.traces is a list of dicts (StageTrace.__dict__)
     return {"stage": stage, "duration_ms": 10.0, "cost_usd": None, "notes": None}
 
+
 path = app.url_path_for("nl2sql_handler")
 
 

tests/test_pipeline_integration.py

@@ -4,6 +4,7 @@ from nl2sql.types import StageResult, StageTrace
 
 # --- Dummy stages to isolate pipeline -----------------------------------------
 
+
 class DummyDetector:
     """Simulates ambiguity detector stage."""