Create migrations for FTS

migrations/15/down.sql

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+DROP EXTENSION pg_trgm;
+
+ALTER TABLE threads
+ DROP COLUMN search_tokens;
+
+ALTER TABLE remarks
+ DROP COLUMN search_tokens;

migrations/15/up.sql

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+-- Fuzzy search
+-- https://hevodata.com/blog/postgresql-full-text-search-setup/#Fuzzy_Search_vs_Full_Text_Search
+CREATE EXTENSION pg_trgm;
+
+-- Create column for seearch tokens
+    ALTER TABLE threads
+      ADD COLUMN search_tokens tsvector
+GENERATED ALWAYS AS
+          (to_tsvector('english', thread_author) ||
+           to_tsvector('english', thread_title ) ||
+           to_tsvector('english', thread_body  )) STORED;
+
+-- Create GIN index for search tokens
+CREATE INDEX threads_search_idx
+    ON threads
+ USING GIN(search_tokens);
+
+-- Same for remarks
+    ALTER TABLE remarks
+      ADD COLUMN search_tokens tsvector
+GENERATED ALWAYS AS
+          (to_tsvector('english', remark_author) ||
+           to_tsvector('english', remark_body  )) STORED;
+
+CREATE INDEX remarks_search_idx
+    ON remarks
+ USING GIN(search_tokens);