fix(growth): stabilize comparison coverage cohort

config.py

@@ -414,7 +414,7 @@ YOUTUBE_API_KEY = os.getenv('YOUTUBE_API_KEY', '')
 # ==========================================
 # 系統版本與路徑
 # ==========================================
-SYSTEM_VERSION = "V10.798"
+SYSTEM_VERSION = "V10.799"
 LOG_FILE_PATH = os.path.join(BASE_DIR, 'logs/system.log')
 public_url = PUBLIC_URL  # 用於模板顯示
 

services/pchome_growth_same_item_reconciliation.py

@@ -496,7 +496,7 @@ def build_coverage_snapshot(payload: dict[str, Any]) -> dict[str, Any]:
     contract = stats.get("comparison_metric_contract") or {}
     partition = contract.get("state_partition") or {}
     return {
-        "scope": contract.get("scope") or f"top_{len(opportunities)}_revenue_opportunities",
+        "scope": contract.get("scope") or f"top_{len(opportunities)}_revenue_products",
         "comparison_ready_count": int(
             partition.get("comparison_ready") or stats.get("mapped_count") or 0
         ),

services/pchome_revenue_growth_service.py

@@ -4,6 +4,7 @@
 
 from __future__ import annotations
 
+import hashlib
 import json
 import logging
 from datetime import date, datetime, time
@@ -202,7 +203,7 @@ def _fetch_sales_rows(conn, limit: int) -> tuple[list[dict[str, Any]], str | Non
         SELECT *
         FROM sales
         WHERE sales_7d > 0 OR sales_prev_7d > 0
-        ORDER BY {order_metric} DESC, qty_7d DESC
+        ORDER BY {order_metric} DESC, qty_7d DESC, pchome_product_id ASC
         LIMIT :limit
     """), {"limit": candidate_limit}).mappings().all()
 
@@ -1178,6 +1179,9 @@ def build_pchome_growth_opportunities(engine, limit: int = 20) -> dict[str, Any]
                 "opportunities": [],
                 "message": str(exc),
             }
+        # Coverage must use a stable revenue-ranked cohort. Mapping status may
+        # reorder work inside the cohort, but must never remove a success from it.
+        sales_rows = sales_rows[:limit]
         sales_ids = [str(row.get("pchome_product_id") or "") for row in sales_rows]
         external_map, market_offer_map = _fetch_external_offer_maps(
             conn,
@@ -1281,13 +1285,24 @@ def build_pchome_growth_opportunities(engine, limit: int = 20) -> dict[str, Any]
     if runtime_external_source_count < registered_external_source_count:
         blocked_reason_codes.append("platform_runtime_coverage_gap")
 
+    scope_ids = [str(row.get("pchome_product_id") or "") for row in sales_rows]
+    scope_fingerprint = hashlib.sha256(
+        json.dumps(scope_ids, ensure_ascii=True, separators=(",", ":")).encode("utf-8")
+    ).hexdigest()[:24]
     comparison_metric_contract = {
-        "version": "pchome_comparison_coverage_v2",
+        "version": "pchome_comparison_coverage_v3",
-        "scope": f"top_{len(opportunities)}_revenue_opportunities",
+        "scope": f"top_{len(opportunities)}_revenue_products",
+        "scope_membership": {
+            "selection_stage": "before_action_priority_scoring",
+            "ranking": "max_current_or_previous_7d_revenue_desc_then_qty_desc_then_product_id_asc",
+            "member_count": len(scope_ids),
+            "fingerprint_sha256": scope_fingerprint,
+            "mapping_status_can_change_membership": False,
+        },
         "numerator": mapped_count,
         "denominator": len(opportunities),
         "rate": mapping_rate,
-        "meaning": "通過同款與價格品質門檻、具正式外部價格證據的高優先商品",
+        "meaning": "營收排名母體中，通過同款與價格品質門檻且具正式外部價格證據的商品",
         "state_partition": {
             "comparison_ready": mapped_count,
             "candidate_validation": candidate_validation_count,
@@ -1314,7 +1329,7 @@ def build_pchome_growth_opportunities(engine, limit: int = 20) -> dict[str, Any]
             "numerator": round(comparison_ready_sales_7d, 2),
             "denominator": round(total_opportunity_sales_7d, 2),
             "rate": comparison_revenue_coverage_rate,
-            "meaning": "高優先商品近 7 天業績中，已有正式同商品外部價格證據的占比",
+            "meaning": "營收排名母體近 7 天業績中，已有正式同商品外部價格證據的占比",
             "state_partition": {
                 "comparison_ready": round(comparison_ready_sales_7d, 2),
                 "candidate_validation": round(candidate_validation_sales_7d, 2),

tests/test_pchome_revenue_growth_service.py

@@ -330,6 +330,45 @@ def test_pchome_growth_coverage_states_are_mutually_exclusive():
     assert stats["comparison_metric_contract"]["state_partition"]["mutually_exclusive"] is True
 
 
+def test_pchome_growth_coverage_scope_is_fixed_before_mapping_priority():
+    from services.pchome_revenue_growth_service import build_pchome_growth_opportunities
+
+    engine = create_engine("sqlite:///:memory:")
+    _seed_growth_tables(engine)
+    with engine.begin() as conn:
+        conn.execute(text("""
+            INSERT INTO daily_sales_snapshot
+                ("商品ID", "商品名稱", snapshot_date, "總業績", "數量", "商品館")
+            VALUES
+                ('PCH-3', '營收第三名', '2026-06-14', 150000, 30, '保養'),
+                ('PCH-4', '營收第四名', '2026-06-14', 145000, 29, '保養'),
+                ('PCH-5', '營收第五名', '2026-06-14', 140000, 28, '保養'),
+                ('PCH-6', '營收第六名', '2026-06-14', 135000, 27, '保養')
+        """))
+
+    payload = build_pchome_growth_opportunities(engine, limit=5)
+    product_ids = {
+        item["pchome_product_id"] for item in payload["opportunities"]
+    }
+    contract = payload["stats"]["comparison_metric_contract"]
+
+    assert "PCH-1" in product_ids
+    assert "PCH-2" not in product_ids
+    assert contract["version"] == "pchome_comparison_coverage_v3"
+    assert contract["scope"] == "top_5_revenue_products"
+    assert contract["numerator"] == 1
+    assert contract["denominator"] == 5
+    assert contract["rate"] == 20.0
+    assert contract["scope_membership"] == {
+        "selection_stage": "before_action_priority_scoring",
+        "ranking": "max_current_or_previous_7d_revenue_desc_then_qty_desc_then_product_id_asc",
+        "member_count": 5,
+        "fingerprint_sha256": contract["scope_membership"]["fingerprint_sha256"],
+        "mapping_status_can_change_membership": False,
+    }
+    assert len(contract["scope_membership"]["fingerprint_sha256"]) == 24
+
+
 def test_momo_review_candidates_return_dual_store_links_and_plain_reasons():
     from services.external_market_offer_service import list_momo_review_candidates