Fix name mismatch between database schema and postgresQDB.

Dependencies

• [2] GCVQD44V Create amends endpoint, switch to UUID primary keys
• [3] NVOCQVAS Initial failing tests.
• [4] 2G3GNDDU Event logging is now functioning in postgres.

Change contents

• replacement in sql/aftok-pg.sql at line 19
  [2.9991]→[2.9991:10041](∅→∅)
  − companion_id uuid references users(id) not null
  [2.9991]

  [3.3201]
  + user_id uuid references users(id) not null