How to implement unique IDs across many tables?

You may want to check out UUID() . It returns a globally unique ID so your IDs will never clash.

If you have a single master database server, you can create a table called Object that has an integer auto-incrementing primary key and an object type column. Every time you create an object, you insert a row into this Object table first, get the id, then use that id to insert a row into whatever table will hold the object information. So to create an Event.

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