Votes now properly retain weight/rshares of last effective_comment_vote_operation

It was achieved by keeping track of existence of effective_comment_vote_operation inside current blob of blocks for each vote record and splitting update into two separate queries - one that updates and skips overwrites of rshares and weight (when only ineffective votes were present meaning default rshares/weight) and the other that updates existing records (when new data came from effective_comment_vote_operation). Unfortunately it is not clear if it would even be possible to do it in single query (but two queries are not slower than original version in this case).

hive/indexer/blocks.py

@@ -238,7 +238,7 @@ class Blocks:
 
         if vote_ops is not None:
           for k, v in vote_ops.items():
-              Votes.effective_comment_vote_op(k, v, cls._head_block_date)
+            Votes.effective_comment_vote_op(k, v)
 
         if Posts.comment_payout_ops:
             cls.ops_stats = Blocks.merge_ops_stats(cls.ops_stats, comment_payout_stats)