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Re:MondayDB: A new in-house data engine from monday.com by renegade-otter on Monday October 09, 2023 @09:00AM (#37820029)
There are RARE exceptions.

AirTable developed their own DB, but their case may be justified. I listened to an interview with a founder once - very thoughtful and reasonable. They fully understood what they were getting into.

But by default, NEVER:

* Write your own DB

* Write your own search engine to match ElasticSearch or other serious technologies

It will take over your life, and then ruin it.

Re:MondayDB: A new in-house data engine from monday.com by tablet on Tuesday October 10, 2023 @03:08AM (#37829312)
Not sure why they needed own DB. Fibery.io has similar domain and we built everything on Postgres. Works like a charm and you even don't have Airtable bases connectivity problem. We have schema-per-customer and table-per-entity-type model, performance is quite good.