Hi how are you ? I hope you are well I am very interested in your project, I am a Developer Engineer for more than 15 years, I have developed several systems, on the occasion of your requirement I can say that I have experience for more than two years in postgresql and plpgsql also a lot of experience with sql, because I put my knowledge at your disposal. If you want me to prepare a specific topic for me to explain, I will. If you want me to start with the basic part I will too. I have developed complete relaconal databases, views, queries of 4 or 5 tables, unions, triggers, functions and stored procedures in short, tell me where you want to start and let's make a good agreement.