add trigram index to search (#3719)

* add trigram index to search

* add community index

migrations/2023-07-24-232635_trigram-index/down.sql

@@ -0,0 +1,8 @@
+DROP INDEX idx_comment_content_trigram;
+
+DROP INDEX idx_post_trigram;
+
+DROP INDEX idx_person_trigram;
+
+DROP INDEX idx_community_trigram;
+

migrations/2023-07-24-232635_trigram-index/up.sql

@@ -0,0 +1,10 @@
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+
+CREATE INDEX IF NOT EXISTS idx_comment_content_trigram ON comment USING gin(content gin_trgm_ops);
+
+CREATE INDEX IF NOT EXISTS idx_post_trigram ON post USING gin(name gin_trgm_ops, body gin_trgm_ops);
+
+CREATE INDEX IF NOT EXISTS idx_person_trigram ON person USING gin(name gin_trgm_ops, display_name gin_trgm_ops);
+
+CREATE INDEX IF NOT EXISTS idx_community_trigram ON community USING gin(name gin_trgm_ops, title gin_trgm_ops);
+