fix: add cross-day dedupe

ai_daily_report/models.py

@@ -14,6 +14,7 @@ class SourceConfig:
     retries: int = 0
     min_items: int = 0
     url: str = ""
+    max_item_age_days: int | None = None
 
 
 @dataclass
@@ -51,3 +52,17 @@ class NewsItem:
     section: str | None = None
     quality_flags: list[str] = field(default_factory=list)
     duplicate_sources: list[dict[str, Any]] = field(default_factory=list)
+
+
+@dataclass
+class PublishedUrlEntry:
+    first_seen: str
+    last_published: str
+    titles: list[str] = field(default_factory=list)
+
+
+@dataclass
+class PublishedUrls:
+    version: int = 1
+    urls: dict[str, PublishedUrlEntry] = field(default_factory=dict)
+    updated_at: str = ""