db: squash migrations

supabase/migrations/20240610132742_lesson_language_versioning.sql

@@ -1,25 +0,0 @@
-CREATE TABLE lesson_language_history (
-  id SERIAL PRIMARY KEY,
-  lesson_language_id INTEGER REFERENCES lesson_language(id),
-  old_content TEXT,
-  new_content TEXT,
-  timestamp TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
-);
-
-CREATE FUNCTION update_lesson_language_history()
-  RETURNS trigger AS $$
-BEGIN
-  IF TG_OP IN ('INSERT', 'UPDATE') THEN
-    INSERT INTO lesson_language_history (lesson_language_id, old_content, new_content)
-    VALUES (NEW.id, COALESCE(OLD.content, ''), NEW.content);
-  END IF;
-  RETURN NULL;
-END;
-$$ LANGUAGE plpgsql;
-
-
-CREATE TRIGGER update_lesson_language_history_trigger
-AFTER INSERT
-OR
-UPDATE ON lesson_language for each row
-EXECUTE PROCEDURE update_lesson_language_history();