Nikolay and Michael discuss PostgreSQL constraints — the six different types we have, how to add and modify them, including on large tables with high TPS. 
 
Here are some links to things they mentioned:

• Constraints (docs) https://www.postgresql.org/docs/current/ddl-constraints.html
• Unique index vs unique constraint issue (2017) https://www.postgresql.org/message-id/flat/CANNMO%2B%2B7%2BuVMj%2BZPGKB_zuRpKE0sNthy2Z-_oKSS%3DoE3_rN7QA%40mail.gmail.com 
• Our episode on NULLs https://postgres.fm/episodes/nulls-the-good-the-bad-the-ugly-and-the-unknown
• Advanced Int to Bigint Conversions (talk by Robert Treat) https://www.youtube.com/watch?v=_IieyXzdmcM 
• Use BIGINT in Postgres (blog post by Ryan Lambert) https://blog.rustprooflabs.com/2021/06/postgres-bigint-by-default 
• How to add a foreign key (Tweet by Nikolay) https://twitter.com/samokhvalov/status/1732056107483636188 
• Bloat, pg_repack, and deferred constraints (blog post by Nikolai Averin from Miro) https://medium.com/miro-engineering/postgresql-bloat-pg-repack-and-deferred-constraints-d0ecf33337ec 

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What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc!

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Postgres FM is brought to you by:

• Nikolay Samokhvalov, founder of Postgres.ai
• Michael Christofides, founder of pgMustard

With special thanks to:

• Jessie Draws for the amazing artwork