-- +goose Up
-- +goose StatementBegin


  -- add the precomputed column
  ALTER TABLE documents ADD COLUMN content_tsv tsvector;
  
  -- populate the new column with the initial data
  UPDATE documents SET content_tsv = to_tsvector('german', content);
  
  -- Step 3: Create a trigger function to update the tsvector column upon insert or update
  CREATE OR REPLACE FUNCTION update_tsvector()
  RETURNS TRIGGER AS $$
  BEGIN
      NEW.content_tsv := to_tsvector('german', NEW.content);
      RETURN NEW;
  END;
  $$ LANGUAGE plpgsql;
  
  -- create the trigger on the documents table
  CREATE TRIGGER documents_tsvector_update
  BEFORE INSERT OR UPDATE ON documents
  FOR EACH ROW EXECUTE FUNCTION update_tsvector();
  
  -- create an index on the precomputed column for faster searches
  CREATE INDEX idx_fts_documents ON documents USING GIN(content_tsv);


-- +goose StatementEnd

-- +goose Down
-- +goose StatementBegin


  -- drop the trigger that updates the tsvector column
  DROP TRIGGER IF EXISTS documents_tsvector_update ON documents;
  
  -- Step 2: Drop the trigger function
  DROP FUNCTION IF EXISTS update_tsvector();
  
  -- Step 3: Drop the tsvector column
  ALTER TABLE documents DROP COLUMN IF EXISTS content_tsv;
  
  -- Step 4: Drop the index on the tsvector column
  DROP INDEX IF EXISTS idx_fts_documents;


-- +goose StatementEnd