refactor: centralize compact date formatting

app/ARCHITECTURE.md

@@ -28,6 +28,8 @@ background scheduler
 
 - `server.py` is the stable command/import facade. Runtime composition lives in
   `backend/application.py` and `backend/bootstrap/`.
+- `backend/bootstrap/` owns process configuration, dependency construction, startup, and
+  shared input/display-format contracts. It does not own feature behavior.
 - `backend/http/` owns common authentication, request IDs, responses, static delivery, and
   error normalization. Feature-specific transport handlers live beside their feature.
   Exact POST endpoints that only delegate to one of those handlers use the explicit maps in

app/backend/bootstrap/config.py

@@ -71,6 +71,10 @@ def normalize_date(value: str) -> str:
     return parsed.strftime("%Y%m%d")
 
 
+def display_compact_date(value: str) -> str:
+    return f"{value[:4]}-{value[4:6]}-{value[6:8]}" if len(value) == 8 else value
+
+
 def validate_stock_code(value: str) -> str:
     code = value.strip()
     if not re.fullmatch(r"\d{6}", code):

app/backend/data/providers/tushare_client.py

@@ -11,6 +11,7 @@ from datetime import datetime, time as dt_time, timedelta
 from threading import Lock
 from typing import Any, ClassVar
 
+from backend.bootstrap.config import display_compact_date as _display_date
 from backend.data.numbers import finite_number as _number
 from backend.features.sentiment.engine import apply_sentiment_to_dashboard
 
@@ -2007,10 +2008,6 @@ def _display_time(value: Any) -> str:
     return f"{raw[:2]}:{raw[2:4]}:{raw[4:6]}"
 
 
-def _display_date(value: str) -> str:
-    return f"{value[:4]}-{value[4:6]}-{value[6:8]}" if len(value) == 8 else value
-
-
 def _realtime_market_status(current_time: dt_time) -> str:
     if current_time < dt_time(9, 25):
         return "pre_open"

app/backend/features/screener/engine.py

@@ -8,6 +8,7 @@ from collections import defaultdict
 from datetime import datetime, timedelta
 from typing import Any
 
+from backend.bootstrap.config import display_compact_date as _display_date
 from backend.data.numbers import finite_number as _number
 from backend.data.providers.tushare_client import TushareClient, TushareError
 from backend.features.screener.strategies import ADVANCED_CURATED_STRATEGIES
@@ -2200,7 +2201,3 @@ def _regime_reason(regime: str) -> str:
         "divergence": "指数或核心仍强，但广度、封板质量开始分化。",
         "retreat": "情绪指标继续走弱，应提高筛选门槛并接受无候选结果。",
     }.get(regime, "市场阶段待确认。")
-
-
-def _display_date(value: str) -> str:
-    return f"{value[:4]}-{value[4:6]}-{value[6:8]}" if len(value) == 8 else value

app/config/architecture-inventory.json

@@ -230,6 +230,12 @@
       "path": "backend/data/numbers.py"
     }
   ],
+  "date_formatting": [
+    {
+      "function": "display_compact_date",
+      "path": "backend/bootstrap/config.py"
+    }
+  ],
   "llm_entrypoints": [
     {
       "function": "stream_with_mentor",
@@ -289,13 +295,13 @@
     },
     {
       "path": "backend/features/screener/engine.py",
-      "bytes": 108434,
-      "lines": 2206
+      "bytes": 108387,
+      "lines": 2203
     },
     {
       "path": "backend/data/providers/tushare_client.py",
-      "bytes": 94171,
-      "lines": 2168
+      "bytes": 94124,
+      "lines": 2165
     },
     {
       "path": "frontend/app.js",

app/tests/test_preservation_slice_market.py

@@ -146,6 +146,7 @@ class MarketSliceSourceEquivalenceTests(unittest.TestCase):
             self.assertEqual(sha256(ORIGINAL_ROOT / original), sha256(APP_ROOT / migrated))
         original_tushare = top_level_definitions(ORIGINAL_ROOT / "tushare_client.py")
         original_tushare.pop("_number")
+        original_tushare.pop("_display_date")
         self.assertEqual(
             original_tushare,
             top_level_definitions(APP_ROOT / "backend/data/providers/tushare_client.py"),
@@ -155,6 +156,13 @@ class MarketSliceSourceEquivalenceTests(unittest.TestCase):
             function_contract(APP_ROOT / "backend/data/numbers.py", "finite_number"),
         )
         self.assertIs(canonical_tushare._number, finite_number)
+        self.assertEqual(
+            function_contract(ORIGINAL_ROOT / "tushare_client.py", "_display_date"),
+            function_contract(
+                APP_ROOT / "backend/bootstrap/config.py", "display_compact_date"
+            ),
+        )
+        self.assertIs(canonical_tushare._display_date, bootstrap_config.display_compact_date)
         original_charts = top_level_definitions(ORIGINAL_ROOT / "chart_data_provider.py")
         original_charts.pop("_stock_market_code")
         self.assertEqual(

app/tests/test_preservation_slice_screener.py

@@ -9,6 +9,7 @@ import advanced_strategies
 import llm_strategy
 import screener
 import strategy_tracking
+from backend.bootstrap import config as bootstrap_config
 from backend.data.numbers import finite_number
 from backend.features.screener import compiler, engine, strategies, tracking
 from backend.features.screener import service as screener_service
@@ -151,12 +152,12 @@ class ScreenerSliceSourceEquivalenceTests(unittest.TestCase):
         self.assertEqual(
             module_contract(
                 ORIGINAL_ROOT / "screener.py",
-                excluded_definitions={"_number"},
+                excluded_definitions={"_display_date", "_number"},
                 exclude_imports=True,
             ),
             module_contract(
                 APP_ROOT / "backend" / "features" / "screener" / "engine.py",
-                excluded_definitions={"_number"},
+                excluded_definitions={"_display_date", "_number"},
                 exclude_imports=True,
             ),
         )
@@ -165,6 +166,13 @@ class ScreenerSliceSourceEquivalenceTests(unittest.TestCase):
             function_contract(APP_ROOT / "backend/data/numbers.py", "finite_number"),
         )
         self.assertIs(engine._number, finite_number)
+        self.assertEqual(
+            function_contract(ORIGINAL_ROOT / "screener.py", "_display_date"),
+            function_contract(
+                APP_ROOT / "backend/bootstrap/config.py", "display_compact_date"
+            ),
+        )
+        self.assertIs(engine._display_date, bootstrap_config.display_compact_date)
         self.assertEqual(
             class_methods(
                 ORIGINAL_ROOT / "backend" / "features" / "screener" / "tracking.py",

app/tools/build_architecture_inventory.py

@@ -159,6 +159,9 @@ def build() -> dict[str, Any]:
             {"function": "finite_number", "path": "backend/data/numbers.py"},
             {"function": "non_nan_number", "path": "backend/data/numbers.py"},
         ],
+        "date_formatting": [
+            {"function": "display_compact_date", "path": "backend/bootstrap/config.py"},
+        ],
         "llm_entrypoints": [
             {"function": "stream_with_mentor", "path": "backend/features/mentor/agent.py"},
             {"function": "interpret_heaven", "path": "backend/features/heaven/agent.py"},