update github content (#519)

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* move message_views.sql to scripts

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Co-authored-by: JRoberts <8711996+jr-simplex@users.noreply.github.com>

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Co-authored-by: JRoberts <8711996+jr-simplex@users.noreply.github.com>

docs/SQL.md

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+# Accessing message history via SQL queries
+
+You can run queries against `direct_messages`, `group_messages` and `all_messages` (or their simpler alternatives `direct_messages_plain`, `group_messages_plain` and `all_messages_plain`), for example:
+
+```sql
+-- you can put these or your preferred settings into ~/.sqliterc
+-- to persist across sqlite3 client sessions
+.mode column
+.headers on
+.nullvalue NULL
+
+-- simple views into direct, group and all_messages
+-- with user's messages deduplicated for group and all_messages;
+-- only 'x.msg.new' ("new message") chat events - filters out service events;
+-- msg_sent is 0 for received, 1 for sent
+select * from direct_messages_plain;
+select * from group_messages_plain;
+select * from all_messages_plain;
+
+-- query other details of your chat history with regular SQL, for example:
+-- files you offered for sending
+select * from direct_messages where msg_sent = 1 and chat_msg_event = 'x.file';
+-- everything catherine sent related to cats
+select * from direct_messages where msg_sent = 0 and contact = 'catherine' and msg_body like '%cats%';
+-- all correspondence with alice in #team
+select * from group_messages where group_name = 'team' and contact = 'alice';
+
+-- aggregate your chat data
+select contact_or_group, num_messages from (
+  select
+    contact as contact_or_group, count(1) as num_messages
+    from direct_messages_plain group by contact
+  union
+  select
+    group_name as contact_or_group, count(1) as num_messages
+    from group_messages_plain group by group_name
+)
+order by num_messages desc;
+```