Specific follow-up of #302 (comment) for PostgreSQL #416 #1195

• https://www.postgresql.org/docs/current/static/textsearch-indexes.html
• https://www.depesz.com/2011/02/19/waiting-for-9-1-faster-likeilike/

Ideal goals:

• just add an index that works with existing LIKE / ILIKE SQL requests
• minor syntax changes would be ok (e.g. lower())
• results must be returned sorted by (descending) entry.id
• avoid manually introducing new tables / columns just for the sake of the full-text search
• bonus if it is possible to delete the index for additional insert performance and reduced storage for users less interested in full-text search