Read about Tom McFarlin's experience using ACF Custom Database Tables for normalising ACF data
For those who love to do it all, creating a table schema, writing the code to create the table, and begin testing writing and reading data to it from ACF – not to mention all of the validation and sanitization needed – sounds like a fun technical problem to solve.
But when working under ‘real world’ constraints, we’re far more limited. After a lot of research (and seriously considering just doing it myself 🙃) I ended up using ACF Custom Database Tables.
Read the full article here:
https://tommcfarlin.com/custom-tables-for-acf-data/