CreateKeyword inserts a new Keyword into database and returns last inserted Id on success.

CreateUser insert a new User into database and returns last inserted Id on success.

GetKeywordByID returns the Keyword by passing keywordID.

GetKeyword gets a Keyword by query.

GetKeywords returns keywords by query.

GetKeywordsCount returns the number of current user's uploaded keywords.

GetUserByID returns the User by passing userID.

UpdateKeyword updates a Keyword and returns the error if any.

KeywordStatus is an implementation of a string for the SQL type.