suggestd pick contacts from email see Library/Suggestions
~//Library/Suggestions
4096 Jan 25 21:26 snippets.db
170 Jan 26 11:39 harvestqueue/
170 Mar 19 18:22 harvestqueueold/
115392 Apr 25 16:29 snippets.db-wal
278528 May 6 21:51 entities.db
32768 May 8 17:49 entities.db-shm
32768 May 8 17:50 snippets.db-shm
49204 May 8 17:50 significant-pseudo-contacts.bf.bf-head (all zeros)
49204 May 8 17:50 significant-pseudo-contacts.bf.bf-tail (all zeros)
214272 May 8 18:10 entities.db-wal
~/Library/Suggestions/harvestqueueold > sqlite3 queue.db
SQLite version 3.8.10.2 2015-05-20 18:17:19
Enter ".help" for usage hints.
sqlite> .schema
CREATE TABLE queue (queueId TEXT PRIMARY KEY, sourceKey TEXT, messageId TEXT) WITHOUT ROWID;
CREATE INDEX emailIdIndex ON queue (sourceKey, messageId);
sqlite> select count(*) from queue;
0