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How a Developer Solved ACF Pro Custom Table Limits in WordPress Multisite

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A developer building an eCoach platform on WordPress Multisite encountered a database architecture challenge when trying to implement a network-wide learner management system using ACF Pro Custom Tables. The core issue was that ACF Pro, by default, creates tables using site-specific database prefixes in a multisite environment, rather than a shared network-level prefix. This meant learner data risked being duplicated across individual sites instead of existing once for the entire network. The developer investigated WordPress database prefix conventions — specifically the difference between $wpdb->prefix and $wpdb->base_prefix — to determine the right approach. The case highlights a broader design principle: identifying whether data belongs to a single site or the whole network before choosing a database architecture.

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