refactor(news): remove retired research workflow

backend/src/alphapulse/news_research/time_contracts.py

@@ -0,0 +1,31 @@
+"""Original occurrence, plan and reporting time contracts."""
+from datetime import datetime
+from typing import Literal
+from pydantic import BaseModel, Field, model_validator
+
+
+class PackageTimePoint(BaseModel):
+    occurred_at: datetime | None = Field(description="发生时间；未知必须为null且time_precision=unknown，已知必须带时区，不用报道时间代替")
+    time_precision: Literal['minute', 'day', 'month', 'unknown'] = Field(description='occurred_at为null时必须unknown；非null时按原文精度选择minute/day/month')
+    planned_at: datetime | None = Field(default=None, description='计划发生时间，不证明已发生')
+    planned_precision: Literal['minute', 'day', 'month', 'unknown'] = 'unknown'
+    period_text: str = Field(default='', description='数据统计期间原文')
+    time_text: str
+    reported_at: datetime | None
+    description: str = Field(min_length=1)
+    verification: Literal['supported', 'partial', 'conflicting', 'insufficient', 'refuted']
+    evidence_refs: list[dict] = Field(min_length=1)
+
+    @model_validator(mode='after')
+    def time_consistency(self):
+        if (self.planned_at is None) != (self.planned_precision == 'unknown'):
+            raise ValueError('计划时间与精度不一致')
+        if self.planned_at and self.planned_at.tzinfo is None:
+            raise ValueError('计划时间必须有时区')
+        if (self.occurred_at is None) != (self.time_precision == 'unknown'):
+            raise ValueError('发生时间与精度不一致')
+        if self.occurred_at and self.occurred_at.tzinfo is None:
+            raise ValueError('发生时间必须有时区')
+        if self.reported_at and self.reported_at.tzinfo is None:
+            raise ValueError('报道时间必须有时区')
+        return self