-- Table recording all significant changes of database-state for auditing purposes
TransactionLog
  time UTCTime
  instance InstanceId
  initiator (CI Text) Maybe -- Case-insensitive user-identifier associated with performing this action
  info Value -- JSON-encoded `Transaction`
  request RequestInfo Maybe -- HTTP-Request info
-- Best guess of users affected by a change in database-state at time of transaction
TransactionLogAffected
  transaction TransactionLogId
  user (CI Text) -- Case-insensitive user-identifier
  UniqueTransactionLogAffected transaction user