Commits on Mar 18, 2019

1. router: Optimize pruning zombie channels. …

   This commit introduces a different, more optimized, appraoch to prune
   zombie channels.
   "zombie channels" stands for channels that their last channel policy
   was update time was earlier than "channe expiry", configured by default
   to a period of 14 days.
   The current approach iterates all channels in the graph in order to
   filter those in need. This approach is time consuming, several seconds
   on my mobile device for ~40,000 channels, while during this time the
   db is locked in a transaction.
   
   The proposed change is to use an existing functionality that utilize the
   fact that channel update are saved indexed by date. This method enables
   us to go over only a small subset of the channels, only those that
   were updated before the "channel expiry" time and further filter
   them for our need.
   The same graph that took several seconds to prune was pruned, after
   the change in several milliseconds.

   

   roeierez committed Mar 18, 2019
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