fix: re-fetch votes when bill has new actions since last vote fetch

Previously skipped bills that had any stored votes. Now also re-queues
bills where latest_action_date > MAX(vote_date), catching new votes on
already-tracked bills.

Authored by: Jack Levy

backend/app/workers/vote_fetcher.py

@@ -243,21 +243,27 @@ def fetch_bill_votes(self, bill_id: str) -> dict:
 def fetch_votes_for_stanced_bills(self) -> dict:
     """
     Nightly task: queue vote fetches for every bill any user has a stance on
-    (pocket_veto or pocket_boost). Only queues bills that don't already have
-    a vote stored, so re-runs are cheap after the first pass.
+    (pocket_veto or pocket_boost). Queues bills with no votes yet, plus bills
+    whose latest stored vote predates the bill's latest_action_date (new vote
+    recorded since last fetch).
     """
-    from app.models.follow import Follow
-
     db = get_sync_db()
     try:
         from sqlalchemy import text as sa_text
         rows = db.execute(sa_text("""
             SELECT DISTINCT f.follow_value AS bill_id
             FROM follows f
-            LEFT JOIN bill_votes bv ON bv.bill_id = f.follow_value
+            JOIN bills b ON b.bill_id = f.follow_value
             WHERE f.follow_type = 'bill'
               AND f.follow_mode IN ('pocket_veto', 'pocket_boost')
-              AND bv.id IS NULL
+              AND (
+                -- no votes fetched yet
+                NOT EXISTS (SELECT 1 FROM bill_votes bv WHERE bv.bill_id = f.follow_value)
+                OR
+                -- bill has had action more recently than our latest stored vote
+                (SELECT MAX(bv.vote_date) FROM bill_votes bv WHERE bv.bill_id = f.follow_value)
+                  < b.latest_action_date
+              )
         """)).fetchall()
 
         queued = 0