Sync old-to-new schema script with reality

[nosnilmot]

Update the update_sql function to match current "new" sql schema

"XRevan86" pointed out in ejabberd@conference.process-one.net that i_push_session_susn should have been created as a unique index, and on closer inspection there are a number of other discrepancies between the update function and the actual schema

Users who have previously updated from old to new schema using this function would need to manually perform the following to correct their schema:

ALTER TABLE archive DROP CONSTRAINT i_archive_sh_peer;
ALTER TABLE archive DROP CONSTRAINT i_archive_sh_bare_peer;
CREATE INDEX i_archive_sh_username_peer ON archive USING btree (server_host, username, peer);
CREATE INDEX i_archive_sh_username_bare_peer ON archive USING btree (server_host, username, bare_peer);

DROP TABLE carboncopy;

ALTER TABLE push_session DROP CONSTRAINT i_push_session_susn;
CREATE UNIQUE INDEX i_push_session_susn ON push_session USING btree (server_host, username, service, node);

ALTER TABLE mix_pam DROP CONSTRAINT i_mix_pam;
ALTER TABLE mix_pam DROP CONSTRAINT i_mix_pam_us;
CREATE UNIQUE INDEX i_mix_pam ON mix_pam (username, server_host, channel, service);
CREATE INDEX i_mix_pam_us ON mix_pam (username, server_host);

ALTER TABLE route DROP CONSTRAINT i_route;
CREATE UNIQUE INDEX i_route ON route USING btree (domain, server_host, node, pid);

ALTER TABLE mqtt_pub DROP CONSTRAINT i_mqtt_topic;
CREATE UNIQUE INDEX i_mqtt_topic_server ON mqtt_pub (topic, server_host);

[prefiks]

Looks fine, let's merge it

[coveralls]

Coverage decreased (-0.009%) to 34.054% when pulling 3324254 on nosnilmot:fix-pg-sql-migrate into 3520869 on processone:master.

[Neustradamus]

It will be nice to see if all are sync (without forgetting):

• https://github.com/nosnilmot/ejabberd/tree/master/sql