refactor(news): remove retired research workflow

backend/src/alphapulse/news_research/retrieval.py

@@ -0,0 +1,17 @@
+"""Bounded keyword matching for original news research."""
+from sqlalchemy import or_, case
+
+ALIASES = {'央行': '中国人民银行', '证监会': '中国证监会', '人行': '中国人民银行'}
+
+
+def terms_for(query, keywords=()):
+    terms = list(dict.fromkeys(t.strip().casefold() for t in (keywords or query.split()) if t.strip()))[:6]
+    if not terms:
+        raise ValueError('检索关键词不能为空')
+    return list(dict.fromkeys([*terms, *(ALIASES[t] for t in terms if t in ALIASES)]))
+
+
+def matching(model, terms):
+    fields = [model.title, model.fact] if hasattr(model, 'fact') else [model.title, model.content_text]
+    matches = [or_(*(field.icontains(term, autoescape=True) for field in fields), model.tags.contains([term])) for term in terms]
+    return or_(*matches), sum((case((match, 1), else_=0) for match in matches), 0)