Hello Ralf, those tables are created when you install the faq module, and notifications are handled different now, so on a migrated system you may end up with legacy tables that might not be needed for the current system but may be needed for data integrity. 

Best Regards. 

2017-01-25 6:59 GMT-06:00 Ralf Hildebrandt <Ralf.Hildebrandt@charite.de>:
Today I set-up a new instance of OTRS5 and diffed the tables against
our very old, OTRS 5s installation (which has been migrated many times):

--- vb-otrs.tables      2017-01-25 13:11:31.470065132 +0100
+++ otrs.tables 2017-01-25 13:11:39.093883923 +0100
@@ -16,6 +16,14 @@
 | customer_user                |
 | dynamic_field                |
 | dynamic_field_value          |
+| faq_attachment               |
+| faq_category                 |
+| faq_history                  |
+| faq_item                     |
+| faq_language                 |
+| faq_state                    |
+| faq_state_type               |
+| faq_voting                   |
 | follow_up_possible           |
 | generic_agent_jobs           |
 | gi_debugger_entry            |
@@ -35,6 +43,7 @@
 | notification_event           |
 | notification_event_item      |
 | notification_event_message   |
+| notifications                |
 | package_repository           |
 | personal_queues              |
 | personal_services            |

As you can see, out "old" instance has a few additional tables:
faq_*
and
notifications

Are these still needed?


--
Ralf Hildebrandt                   Charite Universitätsmedizin Berlin
ralf.hildebrandt@charite.de        Campus Benjamin Franklin
http://www.charite.de              Hindenburgdamm 30, 12203 Berlin
Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155
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