Why is RH-SSO logging an "Unknown column" error?

Issue

• Why is RH-SSO logging an "Unknown column" error?

  2017-12-08 17:36:39,500 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (ServerService Thread Pool -- 51) (conn:17287) Unknown column 'realmentit0_.CERTIFICATE' in 'field list'
  Query is: select realmentit0_.ID as ID1_29_0_, realmentit0_.ACCESS_CODE_LIFESPAN as ACCESS_C2_29_0_, realmentit0_.LOGIN_LIFESPAN as LOGIN_LI3_29_0_, realmentit0_.USER_ACTION_LIFESPAN as USER_ACT4_29_0_, realmentit0_.ACCESS_TOKEN_LIFESPAN as ACCESS_T5_29_0_, realmentit0_.ACCESS_TOKEN_LIFE_IMPLICIT as ACCESS_T6_29_0_, realmentit0_.ACCOUNT_THEME as ACCOUNT_7_29_0_, realmentit0_.ADMIN_EVENTS_DETAILS_ENABLED as ADMIN_EV8_29_0_, realmentit0_.ADMIN_EVENTS_ENABLED as ADMIN_EV9_29_0_, realmentit0_.ADMIN_THEME as ADMIN_T10_29_0_, realmentit0_.BROWSER_FLOW as BROWSER11_29_0_, realmentit0_.CERTIFICATE as CERTIFI12_29_0_, realmentit0_.CLIENT_AUTH_FLOW as CLIENT_13_29_0_, realmentit0_.CODE_SECRET as CODE_SE14_29_0_, realmentit0_.DEFAULT_LOCALE as DEFAULT15_29_0_, realmentit0_.DIRECT_GRANT_FLOW as DIRECT_16_29_0_, realmentit0_.EDIT_USERNAME_ALLOWED as EDIT_US17_29_0_, 
  realmentit0_.EMAIL_THEME as EMAIL_T18_29_0_, realmentit0_.ENABLED as ENABLED19_29_0_, realmentit0_.EVENTS_ENABLED as EVENTS_20_29_0_, realmentit0_.EVENTS_EXPIRATION ...
  

• How can I determine what database schema version number RH-SSO is using?