Supabase Shopify Backend: Side-Car Architecture (2026)

Short summary

Shopify metafields don't scale for complex relational data in B2B portals or multi-depot fulfillment networks. A dedicated Supabase PostgreSQL side-car database provides Row-Level Security, relational integrity, and serverless webhook handling alongside Shopify. This architecture pattern justifies costs for merchants with £1M+ GMV needing custom applications beyond Shopify's native limits.

• •Shopify metafields/metaobjects fail for complex relational queries; side-car databases solve this
• •Supabase RLS provides safe direct browser queries; Realtime subscriptions replace webhook polling
• •Cost-justified for £1M-£15M GMV merchants with B2B portals, custom builders, or booking systems

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