⚡ Bolt: 차트 내보내기(chart.py)의 중복 제거 로직 O(N^2)에서 O(N)으로 최적화

CHANGELOG.md

@@ -7,6 +7,10 @@
 - Display the analyzed song tempo (BPM) as a badge in the rehearsal workspace.
 - 각 합주 역할(Role)별 개인 연습 진행도를 0~100% 범위로 기록 및 시각화할 수 있는 연습 진척도(`practiceProgress`) 트래커 기능 추가. UI 컨트롤(슬라이더 및 +/- 버튼)과 한/영 다국어 지원 포함.
 
+### 성능 최적화 (Performance)
+
+- 차트 내보내기(chart.py)에서 `not in list` 대신 삽입 순서가 보장되는 딕셔너리(`dict.keys()`)를 활용하여 역할, 큐 및 우선순위 데이터의 중복 제거 방식을 $O(N^2)$에서 $O(N)$으로 최적화했습니다.
+
 ## [0.1.3] - 2026-04-29
 
 ### Fixed

services/analysis-engine/src/bandscope_analysis/exports/chart.py

@@ -78,14 +78,14 @@ def _active_role_ids(section: Mapping[str, object]) -> list[str] | None:
     part_graph = section.get("partGraph")
     if not isinstance(part_graph, list):
         return None
-    active: list[str] = []
+    active: dict[str, None] = {}
     for node in part_graph:
         if not isinstance(node, Mapping) or node.get("is_active") is not True:
             continue
         role_id = node.get("role_id")
-        if isinstance(role_id, str) and role_id and role_id not in active:
-            active.append(role_id)
-    return active
+        if isinstance(role_id, str) and role_id:
+            active[role_id] = None
+    return list(active.keys())
 
 
 def _active_roles(section: Mapping[str, object]) -> list[Mapping[str, object]]:
@@ -121,25 +121,25 @@ def _role_display_name(role: Mapping[str, object]) -> str | None:
 
 def _active_role_names(section: Mapping[str, object]) -> list[str]:
     """Return de-duplicated display names for the section's active roles."""
-    names: list[str] = []
+    names: dict[str, None] = {}
     for role in _active_roles(section):
         name = _role_display_name(role)
-        if name is not None and name not in names:
-            names.append(name)
-    return names
+        if name is not None:
+            names[name] = None
+    return list(names.keys())
 
 
 def _section_cue(section: Mapping[str, object]) -> str:
     """Join the active roles' cue values into a single cue string."""
-    cues: list[str] = []
+    cues: dict[str, None] = {}
     for role in _active_roles(section):
         cue = role.get("cue")
         if not isinstance(cue, Mapping):
             continue
         value = cue.get("value")
-        if isinstance(value, str) and value and value not in cues:
-            cues.append(value)
-    return "; ".join(cues)
+        if isinstance(value, str) and value:
+            cues[value] = None
+    return "; ".join(cues.keys())
 
 
 def _confidence_level(section: Mapping[str, object]) -> str | None:
@@ -188,19 +188,18 @@ def _section_lines(sections: list[Mapping[str, object]]) -> list[str]:
 def _footer_lines(song: Mapping[str, object], sections: list[Mapping[str, object]]) -> list[str]:
     """Build the footer: per-role rehearsal priorities and the export focus."""
     lines: list[str] = []
-    priorities: list[str] = []
+    priorities: dict[str, None] = {}
     for section in sections:
         for role in _section_roles(section):
             name = _role_display_name(role)
             priority = role.get("rehearsalPriority")
             if name is None or not isinstance(priority, str) or not priority:
                 continue
             entry = f"  - {name}: {priority}"
-            if entry not in priorities:
-                priorities.append(entry)
+            priorities[entry] = None
     if priorities:
         lines.append("Priorities:")
-        lines.extend(priorities)
+        lines.extend(priorities.keys())
     summary = song.get("exportSummary")
     if isinstance(summary, Mapping):
         headline = summary.get("headline")

services/analysis-engine/tests/test_chart_export.py

@@ -340,3 +340,42 @@ def test_path_like_fields_never_reach_output(self) -> None:
         assert "secret-demo" not in text
         assert "/Users" not in rows_json
         assert "secret-demo" not in rows_json
+
+    def test_deduplication_preserves_first_occurrence_order(self) -> None:
+        """Deduplication uses dictionary keys to preserve insertion order exactly."""
+        song = _demo_song()
+        section = song["sections"][0]
+        # Set up a sequence that will break an unordered set implementation
+        # and test deduplication across disjoint identical values.
+        section["roles"] = [
+            _role("bass", "Bass", "Walk up"),
+            _role("drums", "Drums", "Hit on 1"),
+            _role("keys", "Keys", "Hold chord"),
+            _role("bass-copy", "Bass", "Walk up"),
+            _role("drums-copy", "Drums", "Hit on 1"),
+            _role("keys-copy", "Keys", "Hold chord"),
+        ]
+        for role in section["roles"]:
+            role["rehearsalPriority"] = "medium"
+        section["roles"][0]["rehearsalPriority"] = "high"
+        section["roles"][2]["rehearsalPriority"] = "low"
+
+        section["partGraph"] = [
+            {"role_id": "bass", "is_active": True, "handoff_to": [], "handoff_from": []},
+            {"role_id": "drums", "is_active": True, "handoff_to": [], "handoff_from": []},
+            {"role_id": "keys", "is_active": True, "handoff_to": [], "handoff_from": []},
+            {"role_id": "bass", "is_active": True, "handoff_to": [], "handoff_from": []},
+            {"role_id": "drums", "is_active": True, "handoff_to": [], "handoff_from": []},
+            {"role_id": "keys", "is_active": True, "handoff_to": [], "handoff_from": []},
+        ]
+
+        rows = build_cue_sheet_rows(song)
+        # Order should be exact and duplicates removed
+        assert rows[0]["roles"] == ["Bass", "Drums", "Keys"]
+        assert rows[0]["cue"] == "Walk up; Hit on 1; Hold chord"
+
+        text = build_chart_text(song)
+        # Priorities deduplication
+        assert "  - Bass: high" in text
+        assert "  - Drums: medium" in text
+        assert "  - Keys: low" in text